CN203248995U - LNG receiving station low energy consumption evaporation zero release processing system - Google Patents
LNG receiving station low energy consumption evaporation zero release processing system Download PDFInfo
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- CN203248995U CN203248995U CN 201320203128 CN201320203128U CN203248995U CN 203248995 U CN203248995 U CN 203248995U CN 201320203128 CN201320203128 CN 201320203128 CN 201320203128 U CN201320203128 U CN 201320203128U CN 203248995 U CN203248995 U CN 203248995U
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Abstract
The utility model relates to an LNG receiving station low energy consumption evaporation zero release processing system. The processing system utilizes the characteristic that a wharf unloading pipeline cold insulation circulation system needs starting no matter an LNG receiving station is on a normal operation working condition or on an interval zero outer transmission working condition. An LNG refrigerating branch pipe is arranged on an existing wharf unloading pipeline cold insulation circulation pipeline of the LNG receiving station. LNG is induced from the cold insulation circulation pipeline. The LNG is further cooled by aid of refrigerating equipment. The cooled LNG is sent back to an existing pre-cooling spray system at the top of an LNG storage tank. The LNG is sprayed by the pre-cooling spray system and enters the LNG storage tank, so that BOG inside the tank is absorbed, and BOG zero release processing is realized. The LNG receiving station low energy consumption evaporation zero release processing system is especially suitable for a pitch peak type LNG receiving station, can ensure safe operation of a system and avoid enormous waste brought by the conventional BOG release mode when the LNG receiving station is on the interval zero outer transmission working condition, and has outstanding economic benefits.
Description
Technical field
The utility model relates to a kind of LNG receiving station boil-off gas processing system, particularly about a kind of can be at the LNG receiving station zero outer LNG receiving station low energy consumption boil-off gas zero-discharge treatment system that move under the operating mode of failing intermittently.
Background technique
LNG(liquefied natural gas, LNG Liquefied natural gas) is cryogen, although LNG equipment has good adiabatic measure, but in the process that stores and operate, because of the heat transmission in the external world and the cooling needs of system, can produce inevitably some BOG(Boiled Off Gas, boil-off gas in it).Along with the increase of BOG quantity, the temperature and pressure of LNG storage system inside can increase.When the LNG tank internal pressure was higher than the safety relief pressure of default, the safety valve of LNG storage tank tank deck was opened, with the BOG flare system burning of directly releasing, with the stable system internal pressure.For peak regulation type LNG receiving station, in its normal course of operation, tend to occur the outer defeated traffic demand of gasification at night and cross operating mode low or the outer defeated zero demand of gasification, in this case, the LNG storage system is not because there is the outer defeated LNG of capacity can't open again condensing plant treatments B OG, gathering too much BOG can directly be released and be burnt, and has caused thus the economic loss of great number and environmental emission to pollute.At present, the conventional BOG of LNG receiving station zero discharge treatment device all is to the BOG direct liquefaction, sends it back to LNG storage tank.Because the natural evaporation of BOG and generation are not a stable process, need to repeatedly close down BOG direct liquefaction device, and reaching operation from startup, BOG direct liquefaction device often needs 3～5 hours, cause the practical operation difficulty, cause easily the system pressure unstability,, needs extra tonifying Qi pressurize excessively low such as the LNG pressure of storage tank.
Summary of the invention
For the problems referred to above, the purpose of this utility model provides a kind of LNG receiving station low energy consumption boil-off gas zero-discharge treatment system that can move under the defeated operating mode outside LNG receiving station is intermittently zero.
For achieving the above object, the utility model is taked following technological scheme: a kind of LNG receiving station low energy consumption boil-off gas zero-discharge treatment system, it comprises the harbour discharge pipe cold insulation circulatory system and the LNG tank top precooling spray system that LNG receiving station is existing, it is characterized in that: the cold insulation circulating line of the described harbour discharge pipe cold insulation circulatory system is told LNG refrigeration branch road, the output terminal of described LNG refrigeration branch road connects the pipeline input end of described LNG tank top precooling spray system by pipeline, the pipeline output terminal of described LNG tank top precooling spray system is the shower nozzle of LNG Tank inner top, described LNG refrigeration branch road place is provided with chiller plant, to the LNG cooling in the described LNG refrigeration branch road.
Above-mentioned chiller plant be comprise nitrogen compressor, with the mobile nitrogen swell refrigeration sled of the turbo-expander of pressurized machine and refrigeration ice chest.
Input end and the output terminal of above-mentioned LNG refrigeration branch road are provided with switching ball, also are provided with flowmeter in the described LNG refrigeration branch road.
The pipeline that is connected between above-mentioned LNG refrigeration branch road and the described LNG tank top precooling spray system is the existing discharging main line of LNG receiving station and LNG tank top conveying branch road, the output terminal that is described LNG refrigeration branch road is connected on the described discharging main line, the output terminal of described discharging main line is except connecting existing LNG tank top discharging pipeline and the input end of bottom discharge pipeline, also connect described LNG tank top and carry the input end of branch road, described LNG tank top carries the output terminal of branch road to connect the pipeline input end of described precooling spray system.
The utility model is owing to take above technological scheme, it has the following advantages: 1, the utility model is by arranging LNG refrigeration branch road at the existing harbour discharge pipe cold insulation pipeloop of LNG receiving station, from the cold insulation pipeloop, draw LNG, by chiller plant to its further cooling, and the LNG after will lowering the temperature sends the original precooling spray system of LNG tank top back to, enter the LNG storage tank by its spray, BOG in the tourie, thereby the pressure that can effectively reduce LNG to deposit tank internal cause BOG increase and raise, outside LNG receiving station is intermittently zero, fail under the operating mode especially, can either guarantee system safety operation, can avoid again conventional BOG to release huge waste that the step-down mode brings has significant economic benefit.2, the utility model can arrange the LNG flow in the flowmeter detection LNG refrigeration branch road, by the pressure changing in the central control system Real-Time Monitoring LNG storage tank of LNG receiving station, the aperture of control low pressure pump, thereby regulate the LNG flow that flows into LNG refrigeration branch road, the pressure of controlling reposefully in the LNG storage tank slowly changes, the assurance system can be in the stable state that runs without interruption, avoided in the prior art BOG direct liquefaction device repeatedly to close down, long from starting to the operation needed time, the practical operation difficulty, and the high hidden danger of system pressure unstability risk, Security and operability have had significantly to be improved.3, the utility model can utilize the original discharging main line of LNG receiving station, send the LNG after the chiller plant cooling back to the LNG storage tank, take full advantage of the existing procedure of LNG receiving station, need not to set up a large amount of pipelines, can not cause extra operating influence to the regular job of LNG receiving station yet, adapt to very much intermittently zero outer defeated operating mode of LNG receiving station.4, the utility model preferably mobile nitrogen swell refrigeration sled as chiller plant, to the LNG cooling in the LNG refrigeration branch road, can in same LNG receiving station, satisfy the use of a plurality of LNG storage tanks, also can go to other use in LNG receiving station that needs is arranged, for convenience detach and mobile, the little and flexible arrangement of floor space.
Description of drawings
Fig. 1 is that the utility model system forms structural representation
Fig. 2 is that the utility model moves nitrogen swell refrigeration sledge work schematic representation
Embodiment
Below in conjunction with drawings and Examples the utility model is described in detail.
The utility model mainly is to utilize LNG receiving station accidental conditions and fail the characteristics that operating mode all need be opened the harbour discharge pipe cold insulation circulatory system outside intermittence zero, at the existing harbour discharge pipe cold insulation pipeloop of LNG receiving station LNG refrigeration branch road is set, from the cold insulation pipeloop, draw LNG, by chiller plant to its further cooling, and the LNG after will lowering the temperature sends the original precooling spray system of LNG tank top back to, enter the LNG storage tank by its spray, thereby BOG in the tourie realizes the BOG zero discharge treatment.
As shown in Figure 1, the utility model forms based on the precooling spray system enlarging of the existing harbour discharge pipe cold insulation circulatory system of LNG receiving station and LNG tank top.The existing harbour discharge pipe cold insulation circulatory system of LNG receiving station is usually by the low pressure pump 2, LNG external transport pipeline 3, cold insulation pipeloop 4, the discharging main line 5 that extract LNG from LNG storage tank 1, and LNG storage tank 1 top discharging pipeline 6 and bottom discharge pipeline 7 consist of.Wherein, the output terminal of low pressure pump 2 connects the input end of LNG external transport pipeline 3, and minute out branch also is cold insulation pipeloop 4 on the LNG external transport pipeline 3.The output terminal of cold insulation pipeloop 4 is connected on the discharging main line 5 of LNG storage tank 1, the output terminal of discharging main line 5 connects the input end of LNG storage tank 1 top discharging pipeline 6 and bottom discharge pipeline 7, and the output terminal of LNG storage tank 1 top discharging pipeline 6 and bottom discharge pipeline 7 is separately positioned on top and the bottom of LNG storage tank 1.Feature of the present utility model just is, it tells LNG refrigeration branch road 8 at the cold insulation pipeloop 4 of the harbour discharge pipe cold insulation circulatory system, the output terminal of LNG refrigeration branch road 8 connects the pipeline input end of LNG storage tank 1 top original precooling spray system (not shown) by pipeline, the pipeline output terminal of precooling spray system is the shower nozzle 9 of LNG storage tank 1 tank inner top, LNG refrigeration branch road 8 places are provided with chiller plant 10, to the LNG cooling in the LNG refrigeration branch road 8.
Input end and the output terminal of above-mentioned LNG refrigeration branch road 8 are provided with switching ball 11.In addition, in the LNG refrigeration branch road 8 the flowmeter (not shown) can also be set, by the pressure changing in the LNG storage tank 1 of the central control system Real-Time Monitoring of LNG receiving station, the aperture of control low pressure pump 2, thereby regulate the LNG flow that flows into LNG refrigeration branch road 8, the pressure of controlling reposefully in the LNG storage tank 1 slowly changes.
For reducing cost, the utility model can also take full advantage of the LNG of existing discharging main line 5 conveyings after chiller plant 10 coolings of LNG receiving station to LNG storage tank 1, specifically arrange as follows: the output terminal of LNG refrigeration branch road 8 is connected on the discharging main line 5, the output terminal of discharging main line 5 is except connecting the input end of existing LNG storage tank 1 top discharging pipeline 6 and bottom discharge pipeline 7, also connect and establish in addition the input end that branch road 12 is carried at a LNG storage tank 1 top, LNG storage tank 1 top carries the output terminal of branch road 12 to connect the pipeline input end of the original precooling spray system in LNG storage tank 1 top.During operation, because communication system is in intermittently zero outer defeated operating mode outside the LNG receiving station, only have the LNG after chiller plant 10 coolings in the discharging main pipe 5, the valve 13 of LNG storage tank 1 top discharging pipeline 6 and bottom discharge pipeline 7 needs to keep closed condition.
As shown in Figure 2, the utility model can adopt mobile nitrogen swell refrigeration sledge as chiller plant 10.Mobile nitrogen swell refrigeration sledge is mainly by nitrogen compressor, form with turbo-expander and the ice chest of pressurized machine.During work, the nitrogen process of nitrogen compressor 21 outputs reaches default pressure with the pressurized end 22 of the turbo-expander of pressurized machine, through reaching default low temperature after inflating end 23 compound expansions, in ice chest 24 with circulation LNG heat exchange, nitrogen after heat exchange heats up returns to nitrogen compressor, constantly circulation.
As shown in Figure 1, with the example that is applied as in the 16 ten thousand stere LNG storage tanks, by calculating, the BOG production of 16 ten thousand stere storage tanks is 2 tons/hour, need 1103709 kilojoules/hour cold it could be liquefied, in theory, BOG is condensed to 21 tons/hour LNG circulating load of-162 ℃ of needs-173 ℃.Low pressure pump is incited somebody to action-162 ℃ with 21 tons/hour flow, 0.9Mpa LNG from storage tank, pump, LNG external transport pipeline by 16 cun of LNG tank top, enter 12 cun cold insulation pipeloop, then enter LNG refrigeration branch road, at mobile nitrogen swell refrigeration sledge deep cooling in-173 ℃ ice chest, absorb wherein cold 910560 kilojoules/hour, LNG is-173 ℃ after the cooling, return LNG storage tank discharging main pipe line, send into LNG storage tank precooling spray system by it, through No. 6 diaphragm valves and No. 83 cun reducer pipes that become 4 cun, spray into the speed of 2.07 meter per seconds and to absorb BOG in the storage tank, so constantly circulation.In the cyclic process, can by the pressure changing in the central control system Real-Time Monitoring LNG storage tank of LNG receiving station, increase or reduce the LNG flow that flows into LNG refrigeration branch road, to guarantee LNG tank inner pressure system stability.
As shown in Figure 2, be cooled to 3.6MpaG from the nitrogen of ice chest through the nitrogen compressor compression, 40 ℃ of outputs are pressurized to 4.9MpaG through the pressurized end of turbo-expander, after 40 ℃, are cooled to-44 ℃ by ice chest; The nitrogen that is cooled to-44 ℃ is divided into two parts, and a part is drawn out of the inflating end (flow direction of K1 shown in Fig. 2) that ice chest is sent to turbo-expander, expands to be cooled to-113 ℃, then returns ice chest middle part (flow direction of K2 shown in Fig. 2); After another part then continues to be cooled to-118 ℃, be drawn out of the inflating end (flow direction of K3 shown in Fig. 2) that ice chest is sent to turbo-expander, continuing to expand is cooled to-173 ℃, then returns ice chest bottom (flow direction of K4 shown in Fig. 2); In the nitrogen of ice chest bottom low temperature and the circulation LNG heat exchange that low pressure pump is got, the nitrogen after the heat exchange returns to nitrogen compressor through ice chest, constantly circulation.
The various embodiments described above only are used for explanation the utility model; wherein the structure of each parts, Placement etc. all can change to some extent; every equivalents and improvement of carrying out on the basis of technical solutions of the utility model all should do not got rid of outside protection domain of the present utility model.
Claims (5)
1. LNG receiving station low energy consumption boil-off gas zero-discharge treatment system, it comprises the harbour discharge pipe cold insulation circulatory system and the LNG tank top precooling spray system that LNG receiving station is existing, it is characterized in that: the cold insulation circulating line of the described harbour discharge pipe cold insulation circulatory system is told LNG refrigeration branch road, the output terminal of described LNG refrigeration branch road connects the pipeline input end of described LNG tank top precooling spray system by pipeline, the pipeline output terminal of described LNG tank top precooling spray system is the shower nozzle of LNG Tank inner top, described LNG refrigeration branch road place is provided with chiller plant, to the LNG cooling in the described LNG refrigeration branch road.
2. a kind of LNG as claimed in claim 1 receiving station low energy consumption boil-off gas zero-discharge treatment system is characterized in that: described chiller plant be comprise nitrogen compressor, with the turbo-expander of pressurized machine and the mobile nitrogen swell refrigeration sled of refrigeration ice chest.
3. a kind of LNG as claimed in claim 1 receiving station low energy consumption boil-off gas zero-discharge treatment system, it is characterized in that: input end and the output terminal of described LNG refrigeration branch road are provided with switching ball, also are provided with flowmeter in the described LNG refrigeration branch road.
4. a kind of LNG as claimed in claim 2 receiving station low energy consumption boil-off gas zero-discharge treatment system, it is characterized in that: input end and the output terminal of described LNG refrigeration branch road are provided with switching ball, also are provided with flowmeter in the described LNG refrigeration branch road.
5. as claimed in claim 1 or 2 or 3 or 4 a kind of LNG receiving station low energy consumption boil-off gas zero-discharge treatment system, it is characterized in that: the pipeline that is connected between described LNG refrigeration branch road and the described LNG tank top precooling spray system is the existing discharging main line of LNG receiving station and LNG tank top conveying branch road, the output terminal that is described LNG refrigeration branch road is connected on the described discharging main line, the output terminal of described discharging main line is except connecting existing LNG tank top discharging pipeline and the input end of bottom discharge pipeline, also connect described LNG tank top and carry the input end of branch road, described LNG tank top carries the output terminal of branch road to connect the pipeline input end of described precooling spray system.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201320203128 CN203248995U (en) | 2013-04-22 | 2013-04-22 | LNG receiving station low energy consumption evaporation zero release processing system |
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| Application Number | Priority Date | Filing Date | Title |
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| CN 201320203128 CN203248995U (en) | 2013-04-22 | 2013-04-22 | LNG receiving station low energy consumption evaporation zero release processing system |
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| CN203248995U true CN203248995U (en) | 2013-10-23 |
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| CN 201320203128 Expired - Lifetime CN203248995U (en) | 2013-04-22 | 2013-04-22 | LNG receiving station low energy consumption evaporation zero release processing system |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103234117A (en) * | 2013-04-22 | 2013-08-07 | 中国海洋石油总公司 | Low-energy-consumption zero-emission evaporated gas treating system of liquefied natural gas (LNG) receiving station |
| CN105270772A (en) * | 2014-07-07 | 2016-01-27 | 中石化洛阳工程有限公司 | Ethylene spherical tank cooling depressurizing method |
| CN107314234A (en) * | 2017-06-30 | 2017-11-03 | 中海石油气电集团有限责任公司 | A kind of use LNG hydraulic turbines solve the processing system and method for LNG losses |
-
2013
- 2013-04-22 CN CN 201320203128 patent/CN203248995U/en not_active Expired - Lifetime
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103234117A (en) * | 2013-04-22 | 2013-08-07 | 中国海洋石油总公司 | Low-energy-consumption zero-emission evaporated gas treating system of liquefied natural gas (LNG) receiving station |
| CN103234117B (en) * | 2013-04-22 | 2016-01-13 | 中国海洋石油总公司 | A kind of LNG receiving station low energy consumption boil-off gas zero-discharge treatment system |
| CN105270772A (en) * | 2014-07-07 | 2016-01-27 | 中石化洛阳工程有限公司 | Ethylene spherical tank cooling depressurizing method |
| CN107314234A (en) * | 2017-06-30 | 2017-11-03 | 中海石油气电集团有限责任公司 | A kind of use LNG hydraulic turbines solve the processing system and method for LNG losses |
| CN107314234B (en) * | 2017-06-30 | 2019-04-23 | 中海石油气电集团有限责任公司 | A kind of processing system and method solving LNG loss with LNG hydraulic turbine |
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| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| AV01 | Patent right actively abandoned |
Granted publication date: 20131023 Effective date of abandoning: 20160113 |
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| C25 | Abandonment of patent right or utility model to avoid double patenting |