CN205137070U - LNG storage tank BOG's recovery system - Google Patents
LNG storage tank BOG's recovery system Download PDFInfo
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- CN205137070U CN205137070U CN201520792313.5U CN201520792313U CN205137070U CN 205137070 U CN205137070 U CN 205137070U CN 201520792313 U CN201520792313 U CN 201520792313U CN 205137070 U CN205137070 U CN 205137070U
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- storage tank
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- stage compressor
- bog
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Abstract
The utility model discloses a LNG storage tank BOG's recovery system, return hot -air heater and low pressure natural gas heater including the storage tank, the access connection BOG that the storage tank returned the hot -air heater advances the pipeline, the export that the storage tank returned the hot -air heater has connected gradually the single -stage -compression machine, a first cooler, split -compressor, a second cooler, the three -stage compressor, the third cooler, four stage compressor, the fourth cooler, the export of fourth cooler is connected with the liquefaction pipeline respectively, mend the cryogen pipeline and fail the pipeline outward, still be connected with the pipeline of giving vent to anger between second cooler and the three -stage compressor, low pressure natural gas heater connection returns between the import and export of hot -air heater at the storage tank. The utility model discloses the system utilizes BOG compressor control storage -tank pressure to avoid BOG's unloading extravagant, handle through multi -stage compression and effectively to eliminate the nitrogen gas in the storage tank, the compressor adopts the normal atmospheric temperature compressor, and the power consumption is few, and is with low costs, the utility model discloses abundant and full factory of system technology combines, realizes comprehensive use of resources.
Description
Technical field
The utility model relates to lng production field, specifically the reclaiming system of a kind of LNG storage tank BOG.
Background technique
LNG storage tank is the visual plant of LNG liquefaction plant, existing LNG storage tank is generally atmospheric low-temperature storage tank, although cold insulation measure all taked by storage tank, but evaporation is still inevitable, the BOG that LNG produces makes tank inner pressure and temperature raise, and therefore not only gives storage tank dangerous, and bring very large potential safety hazard to factory, therefore must improve existing storage tank, make LNG safe storage in storage tank, avoid the waste of BOG simultaneously.
Model utility content
The purpose of this utility model is the reclaiming system providing a kind of LNG storage tank BOG, avoids the waste that the direct emptying of BOG in LNG storage tank causes, to solve the problem proposed in above-mentioned background technology.
For achieving the above object, the utility model provides following technological scheme:
The reclaiming system of a kind of LNG storage tank BOG, comprise storage tank and return hot-air heater and low pressure natural gas heater, the import that described storage tank returns hot-air heater connects BOG inlet pipe line, the outlet that storage tank returns hot-air heater is connected with stage compressor in turn, first cooler, two stage compressor, second cooler, three stage compressor, 3rd cooler, four-stage compressor, 4th cooler, the outlet of described 4th cooler is connected to liquefaction pipeline, mend refrigerant line and external transport pipeline, pipeline between second cooler and three stage compressor is also connected with pipeline of giving vent to anger, described low pressure natural gas heater is connected to storage tank and returns between the import of hot-air heater and outlet, the outlet line of low pressure natural gas heater is connected with control valve.
As further program of the utility model: described stage compressor, two stage compressor, three stage compressor and four-stage compressor are normal temperature compressed machine.
As the utility model further scheme: described liquefaction pipeline, benefit refrigerant line, external transport pipeline and pipeline of giving vent to anger all are provided with control valve.
Compared with prior art, the beneficial effects of the utility model are: present system utilizes BOG compressor control pressure of storage tank, thus avoid the emptying of BOG to waste; The nitrogen in storage tank effectively can be eliminated by multistage compression process; Compressor adopts normal temperature compressed machine, and power consumption is few, and cost is low; Present system is fully combined with full factory technique, realizes comprehensive utilization of resources.
Accompanying drawing explanation
Fig. 1 is the structural representation of the reclaiming system of LNG storage tank BOG.
Embodiment
Below in conjunction with the accompanying drawing in the utility model embodiment, be clearly and completely described the technological 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, in the utility model embodiment, the reclaiming system of a kind of LNG storage tank BOG, comprise storage tank and return hot-air heater 1 and low pressure natural gas heater 3, the import that storage tank returns hot-air heater 1 connects BOG inlet pipe line, the outlet that storage tank returns hot-air heater 1 is connected with stage compressor 2 in turn, first cooler 4, two stage compressor 5, second cooler 6, three stage compressor 7, 3rd cooler 8, four-stage compressor 9, 4th cooler 10, the outlet of the 4th cooler 10 is connected to liquefaction pipeline 11, mend refrigerant line 12 and external transport pipeline 13, pipeline between second cooler 6 and three stage compressor 8 is also connected with pipeline 14 of giving vent to anger, liquefaction pipeline 11, mend refrigerant line 12, external transport pipeline 13 and pipeline 14 of giving vent to anger all are provided with control valve 15.
Low pressure natural gas heater 3 is connected to storage tank and returns between the import of hot-air heater 1 and outlet, the outlet line of low pressure natural gas heater 3 is connected with control valve 15.
Stage compressor 2, two stage compressor 5, three stage compressor 7 and four-stage compressor 9 are normal temperature compressed machine.
Working principle of the present utility model is:
The displacement gas that intrasystem BOG source mainly comprises technique throttling generation gas (gas produced after the throttling of heat exchange of heat pipe outlet high-pressure liquefaction rock gas), LNG storage tank is heated boil-off gas, LNG storage tank liquid level rises, pipeline heat absorption produce gas, entrucking returns gas (boil-off gas containing raffinate collecting tank) etc.
In the reclaiming system of BOG, BOG returns in hot-air heater 1 at storage tank and is cleaned gas heating, gas after heating is transported in stage compressor 2 and carries out compression supercharging, then enter in the first cooler 4 and cool, thus prevent the temperature of BOG from rising too high, recycle after the supercharging of compressor and the cooling of cooler again; Cool after two stage compressor supercharging, and pipeline 14 of giving vent to anger, extract the fuel gas of one gas as conduction oil unit out; Gas after four-stage compressor supercharging cools again, prevents the temperature of BOG from reaching technological requirement, and a part of BOG again liquefies through liquefaction pipeline 11 rework solution gasifying device under the control of control valve 15; Part BOG enters refrigerant system through mending refrigerant line 12 under the control of control valve 15.
If when factory is in stopping production, there is no purified gas, BOG cannot return in hot-air heater 1 at storage tank and be cleaned gas heating, in order to avoid causing the wasting of resources because BOG when stopping will drain into cold torch after tank inner pressure superelevation, thus a low pressure natural gas heater 3 is set, BOG is after low pressure natural gas heater 3 heats up, under the control of control valve 15, be transported in stage compressor 2 and carry out supercharging, again after secondary, the supercharging of three grades of one-level level Four, under the control of control valve 15, be transported to downstream pipe network through external transport pipeline carry out outer defeated process.
To those skilled in the art, obvious the utility model is not limited to the details of above-mentioned one exemplary embodiment, and when not deviating from spirit of the present utility model or essential characteristic, can realize the utility model in other specific forms.Therefore, no matter from which point, all should embodiment be regarded as exemplary, and be nonrestrictive, scope of the present utility model is limited by claims instead of above-mentioned explanation, and all changes be therefore intended in the implication of the equivalency by dropping on claim and scope are included in the utility model.Any reference character in claim should be considered as the claim involved by limiting.
In addition, be to be understood that, although this specification is described according to mode of execution, but not each mode of execution only comprises an independently technological scheme, this narrating mode of specification is only for clarity sake, those skilled in the art should by specification integrally, and the technological scheme in each embodiment also through appropriately combined, can form other mode of executions that it will be appreciated by those skilled in the art that.
Claims (3)
1. the reclaiming system of a LNG storage tank BOG, comprise storage tank and return hot-air heater and low pressure natural gas heater, it is characterized in that, the import that described storage tank returns hot-air heater connects BOG inlet pipe line, the outlet that storage tank returns hot-air heater is connected with stage compressor in turn, first cooler, two stage compressor, second cooler, three stage compressor, 3rd cooler, four-stage compressor, 4th cooler, the outlet of described 4th cooler is connected to liquefaction pipeline, mend refrigerant line and external transport pipeline, pipeline between second cooler and three stage compressor is also connected with pipeline of giving vent to anger, described low pressure natural gas heater is connected to storage tank and returns between the import of hot-air heater and outlet, the outlet line of low pressure natural gas heater is connected with control valve.
2. the reclaiming system of LNG storage tank BOG according to claim 1, is characterized in that, described stage compressor, two stage compressor, three stage compressor and four-stage compressor are normal temperature compressed machine.
3. the reclaiming system of LNG storage tank BOG according to claim 1, is characterized in that, described liquefaction pipeline, benefit refrigerant line, external transport pipeline and pipeline of giving vent to anger all are provided with control valve.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520792313.5U CN205137070U (en) | 2015-10-15 | 2015-10-15 | LNG storage tank BOG's recovery system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520792313.5U CN205137070U (en) | 2015-10-15 | 2015-10-15 | LNG storage tank BOG's recovery system |
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| CN205137070U true CN205137070U (en) | 2016-04-06 |
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| CN201520792313.5U Active CN205137070U (en) | 2015-10-15 | 2015-10-15 | LNG storage tank BOG's recovery system |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105865145A (en) * | 2016-04-22 | 2016-08-17 | 晋城华港燃气有限公司 | Coalbed methane liquefaction process |
| CN105973030A (en) * | 2016-07-01 | 2016-09-28 | 无锡市豫达换热器有限公司 | Natural gas supercharger |
| CN106121974A (en) * | 2016-06-30 | 2016-11-16 | 日照海达尔加气设备有限公司 | A kind of cryogenic energy utilization liquefied natural gas compressor and method |
| CN109340088A (en) * | 2018-11-29 | 2019-02-15 | 浙江强盛压缩机制造有限公司 | LNG receiving station BOG compressor large-sized wind cooling device |
-
2015
- 2015-10-15 CN CN201520792313.5U patent/CN205137070U/en active Active
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105865145A (en) * | 2016-04-22 | 2016-08-17 | 晋城华港燃气有限公司 | Coalbed methane liquefaction process |
| CN105865145B (en) * | 2016-04-22 | 2019-08-09 | 晋城华港燃气有限公司 | A kind of coal gas gasification technique |
| CN106121974A (en) * | 2016-06-30 | 2016-11-16 | 日照海达尔加气设备有限公司 | A kind of cryogenic energy utilization liquefied natural gas compressor and method |
| CN106121974B (en) * | 2016-06-30 | 2018-01-26 | 日照海达尔加气设备有限公司 | A kind of cryogenic energy utilization liquefied natural gas compression set and method |
| CN105973030A (en) * | 2016-07-01 | 2016-09-28 | 无锡市豫达换热器有限公司 | Natural gas supercharger |
| CN109340088A (en) * | 2018-11-29 | 2019-02-15 | 浙江强盛压缩机制造有限公司 | LNG receiving station BOG compressor large-sized wind cooling device |
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| GR01 | Patent grant |