CN205156507U - BOG is equipment of liquefying again - Google Patents
BOG is equipment of liquefying again Download PDFInfo
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- CN205156507U CN205156507U CN201520939965.7U CN201520939965U CN205156507U CN 205156507 U CN205156507 U CN 205156507U CN 201520939965 U CN201520939965 U CN 201520939965U CN 205156507 U CN205156507 U CN 205156507U
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Abstract
An embodiment of the utility model provides a BOG is equipment of liquefying again for liquefy BOG with BOG under rewarming's not the condition, reduce the energy consumption loss that BOG rewarming brought. The embodiment of the utility model provides a technical scheme includes of BOG is equipment of liquefying again: BOG channels into pipeline, ejector, vapour and liquid separator, LNG derivation pipeline, heat exchanger, compressor and cooler, the leading -in pipeline of BOG with the first import intercommunication of ejector, the export of ejector with vapour and liquid separator's import intercommunication, vapour and liquid separator's gas exports with the coolant import intercommunication of heat exchanger, the export of a coolant of heat exchanger with the import intercommunication of compressor, the export of the 2nd coolant of heat exchanger with the second import intercommunication of ejector, the import of the 2nd coolant of heat exchanger with the export intercommunication of cooler, the import of cooler with the export intercommunication of compressor.
Description
Technical field
The utility model embodiment relates to the field of liquefaction technology again of BOG, is specifically related to a kind of BOG liquefaction device again.
Background technology
Due to LNG (liquefied natural gas, LiquefiedNaturalGas) storage tank is by the invasion of external environment heat, or some mechanical can be converted into heat energy when submerged pump runs in LNG storage tank, LNG gasification in tank all can be made to produce BOG (flashed vapour, BoilOffGas).
The main processing ways of current liquefied natural gas to BOG is through air temperature type recuperator or water-bath type heater by the BOG gas-heated of ﹣ 120 DEG C to ﹣ about 160 DEG C to normal temperature, then carries out emptying burning; Another kind of processing mode be with air temperature type recuperator or water-bath type heater by the BOG gas-heated of ﹣ 120 DEG C to ﹣ about 160 DEG C to normal temperature, recycle after increasing a BOG compressor compresses.
The defect of prior art is, is liquefied after BOG gas-heated by air temperature type recuperator or water-bath type heater again, and the cold energy of BOG gas is all wasted.
Utility model content
The utility model embodiment provides a kind of BOG liquefaction device again, for being liquefied by BOG when not rewarming by BOG, reduces the energy loss that BOG rewarming brings.
The technical scheme of a kind of BOG of the utility model embodiment liquefaction device again comprises:
BOG incoming line, injector, gas-liquid separator, LNG outgoing line, heat exchanger, compressor and cooler;
First inlet communication of described BOG incoming line and described injector, the outlet of described injector and the inlet communication of described gas-liquid separator, the gaseous phase outlet of described gas-liquid separator is communicated with the first cooling medium inlet of described heat exchanger, first cooling medium outlet of described heat exchanger and the inlet communication of described compressor, the second cooling medium outlet of described heat exchanger and the second inlet communication of described injector; Second cooling medium inlet of described heat exchanger and the outlet of described cooler; The import of described cooler and the outlet of described compressor.
Preferably, in above-mentioned BOG again liquefaction device, described cooler is communicated with by oil removal filter with described heat exchanger.
Preferably, in above-mentioned BOG again liquefaction device, described heat exchanger is coiled heat exchanger.
Preferably, in above-mentioned BOG again liquefaction device, described compressor is CNG compressor.
Preferably, in above-mentioned BOG again liquefaction device, described BOG incoming line is provided with the choke valve for regulating BOG flow.
Preferably, in above-mentioned BOG again liquefaction device, the gaseous phase outlet of described gas-liquid separator is positioned at the top of described gas-liquid separator.
The beneficial effect of employing technique scheme is:
Injector is entered from the gas of compressor after heat exchanger heat exchange, the gas of high pressure expands at a high speed after cooling forms negative pressure of vacuum part in injector, to suck in injector by BOG incoming line from the BOG gas in LNG storage device, low temperature BOG gas after boosting lower the temperature with throttling expansion after gases at high pressure mix after continue to lower the temperature and liquefy, a part becomes liquid natural gas, and another part is the gas phase natural gas of low temperature, then, gas after injector, the natural gas of liquid two-phase carries out gas-liquid separation by gas-liquid separator, liquid natural gas enters LNG storage device by LNG outgoing line, gas phase natural gas enters heat exchanger and carries out exchange heat and absorb certain heat the temperature of gas phase natural gas is raised with the natural gas from the high normal pressure and temperature of cooler in heat exchanger, compressor is entered through heat exchanger, compressor carries out booster compression to gas phase natural gas, by entering heat exchanger after the gas phase natural gas via subcooler cooling down after compression, after high pressure vapor natural gas is lowered the temperature further in heat exchanger, enter injector, cooling of expanding in injector realizes liquefaction.Whole process carries out compression supercharging by compressor to the BOG gas do not liquefied, and by cooler, high pressure BOG is cooled to normal temperature; Enter injector after realizing utilizing the cold of BOG self to make its cold recovery by heat exchanger to lower the temperature further liquefaction, thus realize BOG and liquefy when not rewarming, the energy loss that minimizing BOG rewarming brings.
Accompanying drawing explanation
In order to be illustrated more clearly in the utility model embodiment or technical scheme of the prior art, be briefly described to the accompanying drawing used required in embodiment or description of the prior art below, apparently, accompanying drawing in the following describes is only embodiment of the present utility model, for those of ordinary skill in the art, under the prerequisite not paying creative work, other accompanying drawing can also be obtained according to the accompanying drawing provided.
Fig. 1 is the structure chart of a kind of BOG of the utility model preferred embodiment liquefaction device again.
Detailed description of the invention
The utility model embodiment provides a kind of BOG liquefaction device again, for being liquefied by BOG when not rewarming by BOG, reduces the energy loss that BOG rewarming brings.
Below in conjunction with the accompanying drawing in the utility model embodiment, be clearly and completely described the technical scheme in the utility model embodiment, obviously, described embodiment is only the utility model part embodiment, instead of whole embodiments.Based on the embodiment in the utility model, those of ordinary skill in the art are not making the every other embodiment obtained under creative work prerequisite, all belong to the scope of the utility model protection.
Refer to Fig. 1, the technical scheme of a kind of BOG of the utility model embodiment liquefaction device again comprises:
BOG incoming line 1, injector 2, gas-liquid separator 3, LNG outgoing line 4, heat exchanger 5, compressor 6 and cooler 7;
BOG incoming line 1 is connected with the first import of injector 2, the outlet of injector 2 and the inlet communication of gas-liquid separator 3, the gaseous phase outlet of gas-liquid separator 3 is communicated with the first cooling medium inlet of heat exchanger 5, and the liquid-phase outlet of gas-liquid separator 3 is communicated with LNG outgoing line; First cooling medium outlet of heat exchanger 5 and the inlet communication of compressor 6, the second cooling medium outlet of heat exchanger 5 and the second inlet communication of injector 2; Second cooling medium inlet of heat exchanger 5 and the outlet of cooler 7; The import of cooler 7 and the outlet of compressor 6.
Respectively the specific works principle of BOG liquefaction device is again described in detail below:
First, injector 2 is entered from the gas of compressor 6 after heat exchanger 5 heat exchange, the gas of high pressure expands at a high speed cooling in injector 2, negative pressure of vacuum part is formed while cooling of expanding at a high speed, after forming negative pressure of vacuum part, to suck in injector 2 by BOG incoming line 1 from the BOG gas in LNG storage device, low temperature BOG gas after boosting lower the temperature with throttling expansion after gases at high pressure mix after continue to lower the temperature and liquefy, a mixed gas part becomes liquid natural gas (LNG), and another part is still the gas phase natural gas of low temperature.
Then, the natural gas comprising liquid and gas while injector 2 carries out gas-liquid separation by gas-liquid separator 3, liquid natural gas is by the liquid-phase outlet of gas-liquid separator 3, LNG outgoing line 4 enters LNG storage device, be positioned at the gaseous phase outlet of gas phase natural gas by gas-liquid separator 3 of gas-liquid separator 3, first cooling medium inlet of heat exchanger 5 enters heat exchanger 5, gas phase natural gas carries out exchange heat and absorbs certain heat the temperature of gas phase natural gas is raised with the natural gas from the high normal pressure and temperature of cooler 7 in heat exchanger 5, through the first cooling medium outlet of heat exchanger 5, the import of compressor 6 enters compressor 6, compressor 6 pairs of gas phase natural gases carry out booster compression, by the outlet of the gas phase natural gas via compressor 6 after compression, after the import of cooler 7 enters cooler 7 cooling down, through the outlet of subcooler 7, second cooling medium inlet of heat exchanger 5 enters heat exchanger 5, after high pressure vapor natural gas is lowered the temperature further in heat exchanger 5, through the second cooling medium outlet of heat exchanger 5, second import of injector 2 enters injector 2, cooling of expanding in injector 2 realizes liquefaction.
Whole process carries out compression supercharging by compressor 6 to the BOG gas do not liquefied, and by cooler 7, high pressure BOG is cooled to normal temperature; Enter injector 2 after realizing utilizing the cold of BOG self to make its cold recovery by heat exchanger 5 to lower the temperature further liquefaction, thus realize BOG and liquefy when not rewarming, the energy loss that minimizing BOG rewarming brings.
Further, can also be provided with oil removal filter 8 between cooler 7 and heat exchanger 5, cooler 7 is communicated with by oil removal filter 8 with heat exchanger 5, and oil removal filter 8, for filtering BOG gas, removes moisture, dust and wet goods impurity.
Further, heat exchanger 5 is coiled heat exchanger, and the structure of heat exchanger main body is winding arrangement, and the operating pressure of coiled heat exchanger can reach more than 20Mpa, and heat exchange efficiency is better than other heat exchanger.
Further, compressor can be CNG compressor, and CNG compressor is high-pressure natural gas compressor.
Further, BOG incoming line 1 is provided with the choke valve for regulating BOG flow, can be regulated the BOG flow entering injector 2 by choke valve.
Further, due to the BOG comprising liquefied natural gas in gas-liquid separator 3 and do not liquefy simultaneously, because the BOG gas do not liquefied is usually located at the top of gas-liquid separator 3, so the top of gas-liquid separator 3 is connected with heat exchanger 5, the BOG gas being convenient to not liquefy enters into heat exchanger 5.
It should be noted that, be 0.2 ~ ﹣ 1.2Mpa from the LNG memory devices such as LNG receiving station, LNG factory and LNG filling station and handling facilities at the pressure of the BOG storing and evaporate in cargo handling process, temperature is ﹣ 110 ~ ﹣ 150 DEG C, the operating pressure of gas-liquid separator 3 is 0.3 ~ 1.3Mpa, separation temperature is ﹣ 120 ~ ﹣ 138 DEG C, the BOG temperature entering compressor is generally 10 ~-20 DEG C, the BOG temperature cooled through subcooler 7 is generally 35 ~ 45 DEG C, enter the temperature that heat exchanger 5 carries out precooling and be about ﹣ 55 ~ ﹣ about 68 DEG C, pressure is 12 ~ 25Mpa.
Above embodiment only in order to the technical solution of the utility model to be described, is not intended to limit; Although be described in detail the utility model with reference to previous embodiment, those of ordinary skill in the art is to be understood that: it still can be modified to the technical scheme described in foregoing embodiments, or carries out equivalent replacement to wherein portion of techniques feature; And these amendments or replacement, do not make the essence of appropriate technical solution depart from the spirit and scope of each embodiment technical scheme of the utility model.
Claims (6)
1. a BOG liquefaction device again, is characterized in that, comprising:
BOG incoming line, injector, gas-liquid separator, LNG outgoing line, heat exchanger, compressor and cooler;
First inlet communication of described BOG incoming line and described injector, the outlet of described injector and the inlet communication of described gas-liquid separator, the gaseous phase outlet of described gas-liquid separator is communicated with the first cooling medium inlet of described heat exchanger, first cooling medium outlet of described heat exchanger and the inlet communication of described compressor, the second cooling medium outlet of described heat exchanger and the second inlet communication of described injector; Second cooling medium inlet of described heat exchanger and the outlet of described cooler; The import of described cooler and the outlet of described compressor.
2. BOG according to claim 1 liquefaction device again, is characterized in that, described cooler is communicated with by oil removal filter with described heat exchanger.
3. BOG according to claim 1 liquefaction device again, is characterized in that, described heat exchanger is coiled heat exchanger.
4. BOG according to claim 1 liquefaction device again, is characterized in that, described compressor is CNG compressor.
5. BOG according to claim 1 liquefaction device again, is characterized in that, described BOG incoming line is provided with the choke valve for regulating BOG flow.
6. BOG according to claim 1 liquefaction device again, is characterized in that, the gaseous phase outlet of described gas-liquid separator is positioned at the top of described gas-liquid separator.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520939965.7U CN205156507U (en) | 2015-11-23 | 2015-11-23 | BOG is equipment of liquefying again |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201520939965.7U CN205156507U (en) | 2015-11-23 | 2015-11-23 | BOG is equipment of liquefying again |
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| CN205156507U true CN205156507U (en) | 2016-04-13 |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106288478A (en) * | 2016-09-28 | 2017-01-04 | 中国海洋石油总公司 | A kind of injector for normal-temperature natural-gas injection LNG cold boil-off gas |
| CN106918197A (en) * | 2017-03-10 | 2017-07-04 | 蚌埠市荣强压缩机制造有限公司 | A kind of BOG reclaims reliquefaction installation |
| CN107543368A (en) * | 2017-07-21 | 2018-01-05 | 中国科学院理化技术研究所 | A kind of remaining BOG gases recycling system |
| CN111637359A (en) * | 2020-06-01 | 2020-09-08 | 中海石油气电集团有限责任公司 | Novel BOG re-condensation system and method for LNG receiving station |
-
2015
- 2015-11-23 CN CN201520939965.7U patent/CN205156507U/en active Active
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106288478A (en) * | 2016-09-28 | 2017-01-04 | 中国海洋石油总公司 | A kind of injector for normal-temperature natural-gas injection LNG cold boil-off gas |
| CN106918197A (en) * | 2017-03-10 | 2017-07-04 | 蚌埠市荣强压缩机制造有限公司 | A kind of BOG reclaims reliquefaction installation |
| CN107543368A (en) * | 2017-07-21 | 2018-01-05 | 中国科学院理化技术研究所 | A kind of remaining BOG gases recycling system |
| CN107543368B (en) * | 2017-07-21 | 2019-12-27 | 中国科学院理化技术研究所 | Residual BOG gas recycling system |
| CN111637359A (en) * | 2020-06-01 | 2020-09-08 | 中海石油气电集团有限责任公司 | Novel BOG re-condensation system and method for LNG receiving station |
| CN111637359B (en) * | 2020-06-01 | 2022-02-01 | 中海石油气电集团有限责任公司 | BOG re-condensation system and method for LNG receiving station |
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