CN105240064B - A kind of LNG energy recovery process - Google Patents
A kind of LNG energy recovery process Download PDFInfo
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- CN105240064B CN105240064B CN201510829824.4A CN201510829824A CN105240064B CN 105240064 B CN105240064 B CN 105240064B CN 201510829824 A CN201510829824 A CN 201510829824A CN 105240064 B CN105240064 B CN 105240064B
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Abstract
The present invention relates to natural gas in low temperature equipment technical field, more particularly to a kind of LNG energy recovery process, the LNG of high pressure low temperature is by LNG hydraulic turbine installations（Or the expansion machinery of other forms）Turbine end pressure energy be converted into mechanical energy exported by the pressurized end of LNG hydraulic turbine installations.LNG after step-down further lowers the temperature, and the gas-liquid two-phase that pressure reduction is produced is separated by knockout drum, and liquid phase LNG send LNG storage tank, and gas phase BOG is together with the BOG of LNG storage tank through the pressurized end of LNG hydraulic turbine installations --- and BOG superchargers machine is pressurized.The present invention carries out expansion throttling using the J T valves of LNG hydraulic turbine installations substitution LNG product, because the temperature of LNG is lower, so as to reduce BOG yields, improves LNG yield, while mechanical energy can be pressurized the recovery that realize energy to BOG by BOG pressurized ends.
Description
Technical field
The present invention relates to natural gas in low temperature equipment technical field, more particularly to a kind of LNG energy recovery process.
Background technology
Liquefied natural gas (Liquefied Natural Gas, abbreviation LNG), main component is methane, and it is the earth to be recognized
On the most clean energy.Colourless, tasteless, nontoxic and non-corrosiveness, its volume is about the 1/625 of same amount gaseous natural gas volume,
The weight of liquefied natural gas is only 45% or so of consubstantiality ponding., Er Qiefang very small to air pollution after liquefied natural gas burning
The heat for going out is big, so liquefied natural gas is a kind of more advanced energy.
The general manufacturing process of liquefied natural gas is that the natural gas after purification first is liquefied as into height by various refrigeration process
Pressure, the LNG of low temperature, then by Joule-Thomson（J-T）The further reducing pressure by regulating flow of valve forms low pressure, the LNG of low temperature enters normal
Pressure or low pressure storage tank, the significant losses that this process causes high-grade energy cause to waste.Meanwhile, the flash distillation generation of LNG
BOG amounts are larger, increased the cost of BOG treatment.
The content of the invention
A kind of problem that the present invention exists for prior art, there is provided LNG energy recovery process.
The technical scheme is that：
A kind of LNG energy recovery process, comprises the following steps：
1）The natural gas purified by pretreatment unit enters ice chest, and being liquefied by precooling, cryogenic technology to form height and force down
The LNG of temperature；
2）The LNG of the high pressure low temperature is depressurized by the expanding end of expansion machinery device, and the pressure energy of itself is converted into
While mechanical energy, output low temperature, low pressure LNG；
3）After the low temperature, low pressure LNG carry out gas-liquid separation through knockout drum, liquid phase LNG send LNG storage tank to store, gas
Phase BOG converges with the BOG from LNG storage tank 4, by the pressurized end of LNG hydraulic turbine installations, is pressurized into BOG superchargers defeated
Go out, realize the recovery of energy.LNG temperature after step-down is lower, helps to reduce the generation of BOG.
Wherein, BOG superchargers, the supercharging of the BOG and the BOG of LNG storage tank that are produced for LNG expansion decompressions.
Preferably, described expansion machinery device is LNG hydraulic turbine installations.
Preferably, the expanding end of described LNG hydraulic turbine installations preferably centrifugal, or axial-flow type, screw
Or it is reciprocating.
Preferably, driven based on the expanding end of described LNG hydraulic turbine installations, the electricity of the LNG hydraulic turbine installations
Motivation is process auxiliary drive；Drive pattern switching device is provided between the LNG hydraulic turbine installations expanding end and motor 7.
Preferably, described drive pattern switching device is overrunning cluth or fluid coupling.It is with overrunning cluth
Example：Without LNG hydraulic turbine installations（Or other expansion machinery）In the case that expanding end power output or power output are too small,
Motor can be operated alone BOG superchargers.When the rotating speed of the rotating speed higher than motor of LNG hydraulic turbines or other expansion machinery
When, overrunning cluth closure realizes the recovery of energy.When LNG hydraulic turbines（Or other expansion machinery）The rotating speed of expanding end is low
During in the rotating speed of main motor or without output, overrunning cluth is disengaged, and the driving of BOG superchargers is by motor-driven.
Preferably, the rated power of described motor, can be single under the driving of the LNG hydraulic turbine expanding ends described in nothing
Solely drive BOG superchargers.
Preferably, when the rotating speed of described LNG hydraulic turbine expanding ends is higher than the rotating speed of the motor, exceed the speed limit clutch
Device is closed, and realizes the recovery of energy；When the rotating speed of described LNG hydraulic turbine expanding ends is less than the rotating speed of the motor,
Described overrunning cluth is disengaged, and the driving of described BOG superchargers is by the motor-driven.
Preferably, the expanding end of the LNG hydraulic turbine installations is co-axially mounted with BOG superchargers, it would however also be possible to employ other
The kind of drive.
Preferably, dual drive is used between the pressurized end of described LNG hydraulic turbine installations and the input of BOG superchargers
Pattern.
The beneficial effects of the invention are as follows：
（1）Use LNG hydraulic turbine installations（Or the expansion machinery of other forms）Expanding end substitute LNG product J-T
Valve carries out the expansion decompression of LNG, because the LNG temperature after decompression is lower, therefore LNG output increaseds, BOG amount reductions.
（2）LNG hydraulic turbine installations（Or the expansion machinery of other forms）Expanding end conversion gained mechanical energy export to
Power take-off is pressurized for BOG, is capable of achieving effective recovery of energy, saves the power consumption of BOG superchargings.
（3）The driving of BOG superchargers uses LNG hydraulic turbine installations（Or the expansion machinery of other forms）Energy output
With two kinds of drive patterns of motor, powershift can be carried out by overrunning cluth or fluid coupling, it is to avoid technological fluctuation
It is larger, the unstable shortcoming of outer defeated power.
Brief description of the drawings
Accompanying drawing 1 is the schematic flow sheet of LNG energy recovery process；
Wherein, 1 is ice chest；2 is LNG hydraulic turbine installations（Or the expansion machinery of other forms）Expanding end；3 is gas-liquid
Knockout drum；4 is LNG storage tank；5 is LNG hydraulic turbine installations（Or the expansion machinery of other forms）Pressurized end --- BOG be pressurized
Machine；6 is drive pattern switching device；7 is motor.
Specific embodiment
Specific embodiment of the invention is as follows,
Embodiment 1：
LNG hydraulic turbine installations（Or the expansion machinery of other forms）By taking LNG hydraulic turbine installations as an example：
As shown in figure 1, be a kind of schematic flow sheet of LNG energy recovery process, including：
The natural gas purified by pretreatment unit enters ice chest 1, is exchanged heat with cryogen in heat exchanger in ice chest, by pre-
Cold, cryogenic technology liquefies to form the LNG of high pressure low temperature, and the LNG depressurizes by the expanding end 2 of LNG hydraulic turbine installations, by itself
Pressure energy be converted into mechanical energy, output low temperature, low pressure LNG；The low temperature, low pressure LNG carry out gas-liquid point through knockout drum 3
From rear, liquid phase LNG send LNG storage tank 4 to store, and gas phase BOG converges with the BOG from LNG storage tank 4, by LNG hydraulic turbine installations
Pressurized end --- BOG superchargers 5 are pressurized, into BOG superchargers output, realize the recovery of energy.LNG temperature after step-down
Degree is lower, helps to reduce the generation of BOG.
The expanding end 2 of LNG hydraulic turbine installations is centrifugal, and LNG hydraulic turbine installations expansion pressure reduction can be in pressure
Carried out in power simple liquid phase higher, it is also possible to carried out in the relatively low Gas-liquid phase region of pressure.
BOG both can directly be pressurized under low-temperature condition, it is also possible to by ice chest or other exchange heat reclaim colds or
It is pressurized through BOG superchargers again after person other mode of heating re-heat to normal temperature.By taking the LNG devices of 2,000,000 sides/d scales as an example, LNG
Hydraulic turbine installation output shaft power can reach 170 ~ 190kW.
The energy input end of the pressurized end of LNG hydraulic turbine installations --- BOG superchargers 5 uses dual drive pattern, LNG liquid
Driven based on power turbine installation expanding end 2, motor 7 is process auxiliary drive, LNG hydraulic turbine installations expanding end 2 and motor 7 it
Between be provided with drive pattern switching device 6, drive pattern switching device 6 uses overrunning cluth；LNG hydraulic turbine installation expanding ends
2 are co-axially mounted with BOG superchargers 5, it is also possible to be driven otherwise.The rated power of motor 7 is without LNG fluid power
BOG superchargers 5 can be operated alone under the assistance at turbine expansion end 2；When the rotating speed of LNG hydraulic turbines expanding end 2 is higher than electronic
During the rotating speed of machine, overrunning cluth 6 is closed, and realizes the recovery of energy；When the rotating speed of LNG hydraulic turbines expanding end 2 is less than electronic
During the rotating speed of machine, overrunning cluth 6 is disengaged, and the driving of BOG superchargers 5 is driven by motor 7.
By substantial amounts of test, using technique of the invention, than former LNG yield（Using Joule-Thomson（J-T）Valve）'s
LNG yield can improve about 1% ~ 3%.
Embodiment 2：
LNG hydraulic turbine installations expanding end 2 is axial-flow type.
Drive pattern switching device 6, drive pattern switching are provided between LNG hydraulic turbine installations expanding end 2 and motor 7
Device 6 uses fluid coupling.
Other parts such as embodiment 1 sets identical.
By substantial amounts of test, using technique of the invention, than former LNG yield（Using Joule-Thomson（J-T）Valve）'s
LNG yield can improve about 1% ~ 3%.
Embodiment 3：
LNG hydraulic turbine installations expanding end 2 is screw.
Drive pattern switching device 6, drive pattern switching are provided between LNG hydraulic turbine installations expanding end 2 and motor 7
Device 6 uses overrunning cluth.
Other parts such as embodiment 1 sets identical.
By substantial amounts of test, using technique of the invention, than former LNG yield（Using Joule-Thomson（J-T）Valve）'s
LNG yield can improve about 1% ~ 3%.
Claims (6)
1. a kind of LNG energy recovery process, it is characterised in that comprise the following steps：
1) natural gas purified by pretreatment unit enters ice chest, liquefies to form high pressure low temperature by precooling, cryogenic technology
LNG；
2) LNG of the high pressure low temperature is depressurized by the expanding end of expansion machinery device, and the pressure energy of itself is converted into machinery
While energy, output low temperature, low pressure LNG；
3) after the low temperature, low pressure LNG carry out gas-liquid separation through knockout drum, liquid phase LNG send LNG storage tank to store, gas phase BOG
Converge with the BOG from LNG storage tank, by the pressurized end of expansion machinery device -- the supercharging output of BOG superchargers, realize energy
Reclaim；
Described expansion machinery device is LNG hydraulic turbine installations；Driven based on the expanding end of described LNG hydraulic turbine installations
Dynamic, the expanding end of LNG hydraulic turbine installations connects the motor of LNG hydraulic turbine installations, and described motor is process auxiliary drive；
Drive pattern switching device is provided between the expanding end and motor of the LNG hydraulic turbine installations.
2. LNG energy recovery process according to claim 1, it is characterised in that described LNG hydraulic turbine installations it is swollen
Swollen end is centrifugal, axial-flow type.
3. LNG energy recovery process according to claim 1, it is characterised in that described drive pattern switching device is
Overrunning cluth or fluid coupling.
4. LNG energy recovery process according to claim 3, it is characterised in that described motor is in the LNG described in nothing
In the case of the assistance of the expanding end of hydraulic turbine installation, BOG superchargers can be operated alone.
5. the LNG energy recovery process according to claim 3 or 4, it is characterised in that when described LNG hydraulic turbines are filled
When the rotating speed of the expanding end put is higher than the rotating speed of the motor, overrunning cluth closure realizes the recovery of energy；When described
When the rotating speed of the expanding end of LNG hydraulic turbine installations is less than the rotating speed of the motor, described overrunning cluth is disengaged, described
BOG superchargers by the motor-driven.
6. LNG energy recovery process according to claim 1 and 2, it is characterised in that the LNG hydraulic turbine installations
Expanding end is co-axially mounted with BOG superchargers.
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Effective date of registration: 20230411 Address after: 610000 No. 1-16, 42 / F, building 2, No. 88, Jitai fifth road, high tech Zone, Chengdu, Sichuan Patentee after: SICHUAN JEREH HENGRI NATURAL GAS ENGINEERING CO.,LTD. Address before: 264000 No. 9 Jierui Road, Laishan District, Yantai City, Shandong Province Patentee before: JEREH OIL & GAS ENGINEERING Corp. |
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