CN106287221A - A kind of liquefied natural gas receiving station boil-off gas directly exports technique and device - Google Patents
A kind of liquefied natural gas receiving station boil-off gas directly exports technique and device Download PDFInfo
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Abstract
The invention discloses a kind of liquefied natural gas receiving station boil-off gas and directly export technique.The present invention is on the basis of existing BOG directly exports technique, by pressurizations many to LNG, after pressurization, LNG enters turbo-expander expansion work after gasification, utilizes this part of merit to drive BOG compressor and LNG high-pressure pump, the most externally exports mesohigh natural gas and high-pressure natural gas.The inventive method can make full use of the cold energy that high-pressure liquefaction natural gas vaporization process produces, thus reduces the energy consumption of whole receiving station.
Description
Technical field
The present invention relates to a kind of LNG(liquefied natural gas) receiving station's low energy consumption BOG(boil-off gas) directly export technique and output device.
Background technology
LNG receiving station generally refers to the LNG in order to accept sea-freight, builds LNG gasification factory by the sea, be carry out the LNG carried by ocean carrier unloading a ship, store, BOG gasifies, and is defeated by user, engineering etc. outside LNG gasification.Due to the input of outside energy, such as pump operating, the leaking into of surrounding heat, change of atmospheric pressure, environmental effect etc. all can make the liquefied natural gas being in extremely low temperature by thermal evaporation, produce boil-off gas.In storage tank, boil-off gas pressure is the lowest, needs supercharging ability entrance system, thus energy consumption is higher.And when tank internal pressure is higher than the safety relief pressure of default, the BOG of generation will be directly discharged to torch burning, so cause the waste of natural gas.
According to the processing mode difference to boil-off gas in LNG storage tank (BOG), the recovery method of the BOG of LNG receiving station typically has two kinds of methods.One be directly output technique i.e. BOG to be pressurized to outer defeated ductwork pressure through BOG compressor compresses directly outer the most defeated；Another kind is recondensation process, and it is re-liquefied that BOG enters after-condenser heat exchange after BOG compressor is pressurized to certain pressure together with the supercool LNG pressurizeed through low-lift pump, high-pressure pump pressurize, outer defeated after gasifier gasification.
In current existing LNG receiving station technique, BOG directly exports technique, energy consumption of compressor is high, it it is the key point restricting whole process energy consumption, directly export the substantial amounts of cold energy discharged after LNG high pressure LNG after high-pressure pump pressurizes is by gasifier gasification in technique at BOG, the cold energy of LNG is usually used in generating, air separation, desalinization etc..But there is a part of cold energy during LNG vaporization to tend not to can be used nowhere by utilization or low-grade cold energy of 100%.
Current increasing LNG receiving station, except needs are in addition to the defeated pipe network of high pressure length supplies, also needs to the Middle Voltage of short-distance and medium-distance at directly supply, and therefore outer defeated natural gas is divided into high and medium voltage to carry by some LNG receiving stations.
Publication No. CN101881549A, the Chinese patent of entitled " condensate recovery system again of a kind of liquefied natural gas receiving station boil-off gas and recovery method " discloses new condensate recovery system again, the method is on the basis of existing BOG recondensation process, by the BOG after pre-cooling supercharging, the BOG temperature making entrance after-condenser reduces, reduce the LNG cold required for cold energy BOG, thus reach the purpose realizing reducing compressor power consumption.This patent is the energy consumption reducing technique of little scope.Publication No. CN103225740A, entitled a kind of LNG receiving station utilizes the BOG processing system of pressure energy, disclose one on LNG transfer line, separate high pressure LNG transmission branch, it is connected with the input of a liquid-gas mixer-ejector, its outfan and the connection of a mesohigh gasifier, its low pressure suction port is connected with BOG discharge header, thus obtains mesohigh natural gas.But the method reduces the pressure of high-pressure natural gas, wastes high-pressure liquefaction gas pressure.
Summary of the invention
The present invention is gasificated into gases at high pressure after utilizing highly pressurised liquid heat absorption, and the cold energy produced in vaporescence is low compared with the cold energy that mesohigh vaporizing liquid produces, and promotes decompressor acting to process the BOG that receiving station produces by the principle that heat energy changes into kinetic energy.On the basis of existing BOG directly exports technique, by pressurizations many to LNG, decompressor acting after gasification, utilize this part of merit to drive BOG compressor and LNG high-pressure pump, thus reach the purpose of reduction whole receiving station energy consumption.Decompressor is increased on the outer defeated pipe network of present invention high-pressure natural gas after gasifier, make high-pressure natural gas expansion work in decompressor, decompressor acting drives BOG compressor and LNG high-pressure pump, BOG is directly pressurized to outer defeated ductwork pressure directly outer the most defeated, and gasification is outer the most defeated after LNG is pressurized to outer defeated pressure.
The invention provides a kind of liquefied natural gas receiving station boil-off gas and directly export technique, including herein below:
(1) offer can carry out the high-pressure pump of supercharging to low-temp low-pressure liquefied natural gas；
(2) by being delivered to high-pressure pump through the low-temperature liquefaction natural gas of low pressure immersed pump supercharging, low-temp low-pressure liquefied natural gas is carried out supercharging；
(3) liquefied natural gas after high-pressure pump supercharging being delivered to carburator, in carburator, the liquefied natural gas vaporization after supercharging is high-pressure natural gas；
(4) offer can carry out the turbo-expander of expansion work to high-pressure liquefaction natural gas；
(5) high-pressure natural gas that step (3) obtains is delivered to turbo-expander, obtains high-pressure natural gas；
(6) providing gas compressor, the acting utilizing the turbo-expander of step (5) to expand drives this gas compressor；
(7) boil-off gas that liquefied natural gas receiving station obtains enters the gas compressor of step (6), and boil-off gas is carried out supercharging, and the boil-off gas after supercharging is outer defeated.
Output technique according to the present invention, wherein said low-temp low-pressure liquefied natural gas and boil-off gas are all from liquefied natural gas receiving station.
Process according to the invention, wherein, described high-pressure pump uses the conventional equipment of the art.High-pressure pump is cryogenic high pressure pump as mentioned.
Process according to the invention, wherein said gas compressor uses the conventional equipment of the art.
Process according to the invention, wherein, described turbo-expander uses turbine expansion machine equipment well known to those skilled in the art.
Process according to the invention, wherein the turbo-expander described in step (4) includes the two stage turbine decompressor of series connection, first order decompressor and second level decompressor.Wherein, in step (5), the high-pressure natural gas obtained in step (3) is delivered to the first order and second level decompressor successively, obtains high-pressure natural gas, and is utilized respectively first order decompressor and second level expander time institute work.The most in step (7) a metallic, in step (5), the acting of first order expander is used for the gas compressor of actuation step (6), and boil-off gas is carried out supercharging.
Process according to the invention, also includes herein below: expander acting in (8) step (5) second level is used for the high-pressure pump in actuation step (2), and low pressure liquefied natural gas is carried out supercharging.
Therefore, present invention also offers a kind of liquefied natural gas receiving station boil-off gas output technique, including herein below:
(1) offer can carry out the high-pressure pump of supercharging to low-temp low-pressure liquefied natural gas；
(2) by being delivered to high-pressure pump through the low-temperature liquefaction natural gas of low pressure immersed pump supercharging, low-temp low-pressure liquefied natural gas is carried out supercharging；
(3) liquefied natural gas after high-pressure pump supercharging being delivered to carburator, in carburator, the liquefied natural gas vaporization after supercharging is high-pressure natural gas；
(4) offer can carry out the turbo-expander of expansion work to high-pressure liquefaction natural gas, and described turbo-expander includes the two stage turbine decompressor of series connection, first order turbo-expander and second level turbo-expander；
(5) high-pressure natural gas that step (3) obtains is delivered to two stage turbine decompressor first order decompressor and the second level decompressor of series connection successively, obtains high-pressure natural gas；
(6) providing gas compressor, acting when utilizing first order turbo-expander to expand is to drive this gas compressor；
(7) boil-off gas that liquefied natural gas receiving station obtains enters gas compressor, and the boil-off gas after supercharging is directly outer defeated；
(8) acting when second level turbo-expander expands in step (5) is used for the high-pressure pump of actuation step (2).
Process according to the invention, wherein also provides for heat exchanger in the middle of first order turbo-expander and second level turbo-expander.Described carburator can be seawater open-frame type gasifier.
In the technique of the present invention, the output pressure of high-pressure pump is typically higher than the outer defeated pressure 0.1～10MPa of high-pressure natural gas of pipe network, preferably above 0.5～3MPa.
Further, the one-level turbo-expander on high-pressure natural gas transfer line drives BOG compressor by expansion work, and two grades of turbo-expanders drive LNG high-pressure pump by acting.
In the method for the present invention, wherein output pressure 1～10 MPa of second level turbo-expander in output pressure step to be exceeded (5) of step (2) described high-pressure pump, preferably exceeds 2～10 MPa.
Present invention also offers a kind of liquefied natural gas receiving station direct output device of boil-off gas, including:
LNG storage tank, it is for receiving the liquefied natural gas of boats and ships or pipelined；Described LNG storage tank includes the immersed pump for low-temperature liquefaction natural gas carries out supercharging, for the moving-out device by boil-off gas (BOG) removal storage tank, with for the liquefied natural gas after supercharging removes the moving-out device of storage tank；
High-pressure pump, it is for being pressurized to low pressure liquefied natural gas compared with the higher pressure of pipe network output pressure；Described high-pressure pump includes for the feeding line by low pressure liquefied natural gas charging to this high-pressure pump, and for the pipeline after supercharging is fed the pipeline to carburator；
Carburator, it is used for the high-pressure liquefaction natural gas vaporization from high-pressure pump is high-pressure natural gas；It includes for the pipeline by high-pressure liquefaction natural gas feed to this carburator, and is delivered to the pipeline of turbo-expander for the natural gas after vaporizing；
Turbo-expander, it is for carrying out expansion work to the high-pressure natural gas from carburator；It feeding line included for just high-pressure natural gas charging to described turbo-expander, is used for the pipeline of the natural gas output after expanding and is used for the device of the acting output of turbo-expander；
Gas compressor, it is for carrying out supercharging to the boil-off gas from LNG storage tank；It includes for the boil-off gas from LNG storage tank is fed the feeding line to this compressor, the pipeline of the boil-off gas output after being used for compression, and is used for inputting the device of turbo-expander acting.
According to the output device of the present invention, wherein said carburator is the usual heat exchanger of this area, as being seawater open-frame type carburator.
According to the output device of the present invention, wherein said turbo-expander includes two stage turbine decompressor, i.e. first order turbo-expander and second level turbo-expander.Described first order turbo-expander also includes heat exchanger, and heat exchanger is for heating the high-pressure natural gas entering first order turbo-expander.Meanwhile, described second level turbo-expander also includes heat exchanger, to heat the high-pressure natural gas entering second level turbo-expander.Described heat exchanger all uses the conventional equipment of this area, as air or sea water can be used as the heat exchanger of thermal source.Being additionally provided with heat exchanger between two stage turbine decompressor, described heat exchanger is the conventional equipment of this area.
In the liquefied natural gas receiving station direct output device of BOG of the present invention, being used for the moving-out device that boil-off gas (BOG) removes LNG storage tank with the feeding line boil-off gas from LNG storage tank fed to gas compressor can be same device.Equally, for the liquefied natural gas after supercharging being removed the moving-out device of storage tank and can also be same device by the feeding line of low pressure liquefied natural gas charging to high-pressure pump.And for by the feeding line of the high-pressure liquefaction natural gas feed after supercharging to gasifier with to be used for the high pressure LNG moving-out device after high-pressure pump supercharging can also be same device.Equally, with dealing high-pressure pump inputting the device of turbo-expander acting and and being used for the device of the acting output of turbo-expander can also being same axle conveyer device or axle conveying adapting device.
In the present invention, if no special instructions, " LNG " i.e. liquefied natural gas, " NG " i.e. natural gas, " BOG " i.e. boil-off gas, above corresponding technical term can be substituted for each other.
The BOG evaporated in LNG receiving station storage tank in the present invention is delivered to BOG compressor by BOG gas transmission main, BOG is directly sent to high-pressure natural gas or mesohigh natural gas user through compressor pressurization, and BOG compressor is driven by the decompressor on the outer defeated pipe network of high-pressure natural gas.
Compared with prior art, technique and the device of the present invention has following excellent effect.
1, energy consumption is low, and the present invention increases decompressor on the basis of the BOG that LNG receiving station is existing directly compresses output technique on high-pressure natural gas external transport pipeline, and is used for driving BOG compressor and LNG high-pressure pump by decompressor acting.It is known that liquid pressing is prone to gas, therefore present invention process solves existing directly outer defeated technique and there is the problem that energy consumption is high.Meanwhile, the process costs of the present invention is low, has preferable application prospect.
2, it is simulated calculating by the HYSYS software that chemical industry gas industries is widely used, the energy consumption that the present invention saves can accurately be verified.
3, the low-grade cold energy during the inventive method takes full advantage of the direct output procedure of existing BOG, energy-saving effect highlights.In existing LNG receiving station technique, BOG directly exports in technique, energy consumption of compressor is high, it it is the key point restricting whole process energy consumption, directly export the substantial amounts of cold energy discharged after LNG high pressure LNG after high-pressure pump pressurizes is by gasifier gasification in technique at BOG, the cold energy of LNG is usually used in generating, air separation, desalinization etc..But there is a part of high-grade cold energy during LNG vaporization to tend not to can be used nowhere by utilization or high-grade cold energy of 100%.Along with the rising of fluid pressure, the boiling point of vaporizing liquid is the highest, and therefore the vaporizing liquid of different pressures becomes the heat of vaporization temperature that is different and that vaporize of gas the most different, and it is low that the grade of the cold energy discharged just has height to have.The temperature of highly pressurised liquid gasification is higher than the temperature of low-pressure gas vaporization, and the grade of the cold energy that highly pressurised liquid vaporization obtains is low.Therefore, for some region that cold energy use rate is low, can be by high-pressure pump to by after many for LNG pressurizations, high pressure LNG is made to absorb heat gasification in carburator for high-pressure natural gas gas, by externally doing work after high pressure gas expansion, promote high-pressure pump and BOG compressor to do manual work in turn, this process by thermal energy for mechanical energy.So not only reduce the power consumption of compressor etc., also reduce the energy consumption of whole LNG receiving station, also achieve the effective utilization to low-grade cold simultaneously.
Accompanying drawing explanation
Fig. 1 is a kind of flow chart of the inventive method.
Wherein 1-LNG storage tank, 2-low pressure immersed pump, 3-BOG delivery trunk, 4-BOG compressor, 5-high-pressure natural gas or mesohigh natural gas output pipe network, 6-low pressure LNG feed-line, 7-high pressure LNG pump, 8-high pressure LNG feed-line, 9-carburator, 10-high-pressure natural gas feed-line, 11-decompressor, 12-heat exchanger, the outer defeated pipe network of 13-high-pressure natural gas, 14-axle output device.
Fig. 2 is the another kind of flow chart of the inventive method.
Wherein 1-LNG storage tank, 2-low pressure immersed pump, 3-BOG delivery trunk, 4-BOG compressor, 5-high-pressure natural gas or mesohigh natural gas output pipe network, 6-low pressure LNG feed-line, 7-high pressure LNG pump, 8-high pressure LNG feed-line, 9-carburator, 10-high-pressure natural gas feed-line, 11-one-stage expansion machine, 12-first-class heat exchanger, 13-compound expansion machine, 14-secondary heat exchanger, 15-high-pressure natural gas external transport pipeline, 16-one-stage expansion arbor output device, 17-compound expansion arbor output device.
Detailed description of the invention
It is described in further detail sending out the present invention below in conjunction with embodiment and accompanying drawing, but embodiments of the present invention are not limited to this.
nullAs shown in Figure 1，A kind of liquefied natural gas receiving station direct output device of boil-off gas of the present invention includes，LNG storage tank 1，Low pressure immersed pump 2 is for by after low temperature LNG supercharging，Its outfan connects the input of low pressure LNG feed-line 6，The outfan of low pressure LNG feed-line 6 connects the input of high pressure LNG pump 7，The outfan of high pressure LNG pump 7 connects the input of high pressure LNG feed-line 8，The outfan of high pressure LNG feed-line 8 connects the input of carburator 9，The outfan of gasifier 9 connects the input of high-pressure natural gas feed-line 10，The outfan of high-pressure natural gas feed-line 10 connects the input of decompressor 11，The outfan of decompressor 11 connects the input of heat exchanger 12，The axle output device 14 of turbo-expander connects BOG compressor 4，The outfan of heat exchanger 12 connects the input of the outer defeated pipe network 13 of high-pressure natural gas，The outer defeated pipe network 13 of high-pressure natural gas is fed directly to natural gas user pipe network.The input port of described BOG delivery trunk 3 connects LNG storage tank 1, the outfan of BOG delivery trunk 3 connects the input port of BOG compressor 4, the delivery outlet of BOG compressor 4 connects high-pressure natural gas or the input of mesohigh natural gas output pipe network 5, high-pressure natural gas or the output of mesohigh natural gas output pipe network 5 to user's pipe network.
nullAs shown in Figure 2，The another kind of flow process of a kind of liquefied natural gas receiving station direct output device of boil-off gas of the present invention includes: LNG storage tank 1，Low pressure immersed pump 2 is for by after low temperature LNG supercharging，Its outfan connects the input of low pressure LNG feed-line 6，The outfan of low pressure LNG feed-line 6 connects the input of high pressure LNG pump 7，The outfan of high pressure LNG pump 7 connects the input of high pressure LNG feed-line 8，The outfan of high pressure LNG feed-line 8 connects the input of carburator 9，The outfan of gasifier 9 connects the input of high-pressure natural gas feed-line 10，The outfan of high-pressure natural gas feed-line 10 connects the input of one-stage expansion machine 11，The outfan of one-stage expansion machine 11 connects the input of first-class heat exchanger 12，The one-stage expansion arbor output device 16 of one-level turbo-expander connects BOG compressor 4，The outfan of first-class heat exchanger 12 connects the input of compound expansion machine 13，The outfan of compound expansion machine 13 connects the input of secondary heat exchanger 14，The compound expansion arbor output device 17 of two grades of turbo-expanders connects high pressure LNG pump 7，The outfan 14 of secondary heat exchanger connects the input of the outer defeated pipe network 15 of high-pressure natural gas，The outer defeated pipe network 15 of high-pressure natural gas is fed directly to natural gas user pipe network.The input port of described BOG delivery trunk 3 connects LNG storage tank 1, the outfan of BOG delivery trunk 3 connects the input port of BOG compressor 4, the delivery outlet of BOG compressor 4 connects high-pressure natural gas or the input of mesohigh natural gas output pipe network 5, high-pressure natural gas or the output of mesohigh natural gas output pipe network 5 to user's pipe network.
Embodiment 1
Embodiment 1 uses flow process shown in Fig. 1.Wherein BOG compressor is driven by decompressor acting.
In certain LNG receiving station, supplying the natural gas of 9MPa for high-pressure natural gas user, mole composition of LNG is as follows: methane 88.77%, ethane 7.54%, propane 2.59%, iso-butane 0.45%, normal butane 0.56%, nitrogen 0.08%.It is provided with 2 16 × 104 m3LNG storage tank, under LNG normal pressure, boiling point is-162 DEG C, and density is 456kg/m3As a example by, each storage tank warehousing total amount (assuming that storage tank is canful) 72960t.The daily evaporation amount of storage tank is less than 0.05%, and the amount of the boil-off gas therefore produced in 2 storage tanks is 3.04t/h.The operation pressure of storage tank is 0.150MPa, the outer throughput rate of LNG is 200t/h, LNG is pressurized to 1.1MPa through low pressure immersed pump, enter surge tank, calculate through HYSYS, LNG need to be pressurized to 10.83MPa through high-pressure pump by the present invention, is transported to gasifier gasification through high pressure LNG transfer line and becomes natural gas, it is assumed that the pressure drop of gasifier is zero.Expanded machine does work, after expansion, gas pressure is just 9MPa, decompressor acting is driven BOG compressor, BOG is increased to 9MPa and is directly defeated by high-pressure natural gas user outward, this process need high-pressure pump do work 32.92kW, low pressure immersed pump by LNG by 150kPa direct weighting to 1.1MPa acting 2.76kW.Compared with outer existing defeated technique, BOG is needed, by 150kPa direct weighting to 9MPa, the 13.41kW that does work by outer existing defeated technique, low pressure immersed pump by LNG by 150kPa direct weighting to 1.1MPa do work 2.76kW, LNG is pressurized to 9MPa by high-pressure pump needs the 26.18kW that does work, and total power consumption reduces 6.67kW.In flowsheeting, the efficiency of compressor and pump is by 75% calculating, and this is actual with engineering matches.
Implementation result: the present embodiment saves total energy consumption 15.9%.
Embodiment 2
Embodiment 2 uses flow process shown in Fig. 1.
In certain LNG receiving station, supplying the natural gas of 8MPa for high-pressure natural gas user, supply the natural gas of 4MPa for mesohigh user, mole composition of LNG is as follows: methane 88.77%, ethane 7.54%, propane 2.59%, iso-butane 0.45%, normal butane 0.56%, nitrogen 0.08%.It is provided with 2 16 × 104 m3LNG storage tank, under LNG normal pressure, boiling point is-162 DEG C, and density is 456kg/m3As a example by, each storage tank warehousing total amount (assuming that storage tank is canful) 72960t.The daily evaporation amount of storage tank is less than 0.05%, and the amount of the boil-off gas therefore produced in 2 storage tanks is 3.04t/h.The operation pressure of storage tank is 0.150MPa, the outer throughput rate of LNG is 200t/h, LNG is pressurized to 1.1MPa through low pressure immersed pump, enter surge tank, calculate through HYSYS, LNG need to be pressurized to 9.1MPa through high-pressure pump by the present invention, is transported to gasifier gasification through high pressure LNG transfer line and becomes natural gas, it is assumed that the pressure drop of gasifier is zero.Expanded machine does work, after expansion, gas pressure is just 8MPa, decompressor acting is driven BOG compressor, BOG is increased to 4MPa and is directly defeated by mesohigh natural gas user outward, this process need high-pressure pump do work 26.05kW, low pressure immersed pump by LNG by 150kPa direct weighting to 1.1MPa acting 2.76kW.Compared with outer existing defeated technique, BOG is needed, by 150kPa direct weighting to 4MPa, the 9.80kW that does work by outer existing defeated technique, low pressure immersed pump by LNG by 150kPa direct weighting to 1.1MPa do work 2.76kW, LNG is pressurized to 8MPa by high-pressure pump needs the 22.86kW that does work, total power consumption reduces 6.61kW, technique after this explanation improves is notable to reducing energy consumption effect, and in flowsheeting, the efficiency of compressor and pump is by 75% calculating, and this is actual with engineering matches.
Implementation result: the present embodiment saves total energy consumption 18.7%.
Embodiment 3
Embodiment 3 uses flow process shown in Fig. 2.Wherein BOG compressor is driven by the acting of one-stage expansion machine, and LNG high-pressure pump is driven by the acting of compound expansion machine.
In certain LNG receiving station, supplying the natural gas of 6MPa for high-pressure natural gas user, supply the natural gas of 5MPa for mesohigh user, mole composition of LNG is as follows: methane 88.77%, ethane 7.54%, propane 2.59%, iso-butane 0.45%, normal butane 0.56%, nitrogen 0.08%.It is provided with 2 16 × 104 m3LNG storage tank, under LNG normal pressure, boiling point is-162 DEG C, and density is 456kg/m3As a example by, each storage tank warehousing total amount (assuming that storage tank is canful) 72960t.The daily evaporation amount of storage tank is less than 0.05%, and the amount of the boil-off gas therefore produced in 2 storage tanks is 3.04t/h.The operation pressure of storage tank is 0.150MPa, the outer throughput rate of LNG is 200t/h, LNG is pressurized to 1.1MPa through low pressure immersed pump, enter surge tank, calculate through HYSYS, LNG need to be pressurized to 10.65MPa through high-pressure pump by the present invention, is transported to gasifier gasification through high pressure LNG transfer line and becomes natural gas, it is assumed that the pressure drop of gasifier is zero.Do work through one-stage expansion machine, decompressor acting is driven BOG compressor, BOG is pressurized to 5MPa and is directly defeated by mesohigh natural gas user outward, now gas pressure is 9.2 MPa, enter heat exchanger and be warming up to 25 DEG C, enter compound expansion machine expansion work, be used for driving LNG high-pressure pump, gas pressure reduces to 6MPa, enters secondary heat exchanger intensification and sends into high-pressure delivery pipe network.BOG is needed, by 150kPa direct weighting to 5MPa, the 10.74kW that does work by outer existing defeated technique, low pressure immersed pump by LNG by 150kPa direct weighting to 1.1MPa do work 2.76kW, LNG is pressurized to 6MPa by high-pressure pump needs the 16.24kW that does work, need 29.74kW altogether, and this process of the present invention has only to low pressure immersed pump by LNG by 150kPa direct weighting to 1.1MPa acting 2.76kW, compared with outer existing defeated technique, energy-saving effect highly significant.In flowsheeting, the efficiency of compressor and pump is by 75% calculating, and this is actual with engineering matches.
It is above each embodiment and is merely to illustrate the present invention, simply the present invention more preferably detailed description of the invention, every equivalents carried out on the basis of technical solution of the present invention and improvement, the most should not get rid of in scope.
Claims (16)
1. liquefied natural gas receiving station boil-off gas directly exports a technique, including herein below:
(1) offer can carry out the high-pressure pump of supercharging to low-temp low-pressure liquefied natural gas；
(2) by being delivered to high-pressure pump through the low-temperature liquefaction natural gas of low pressure immersed pump supercharging, low-temp low-pressure liquefied natural gas is carried out supercharging；
(3) liquefied natural gas after high-pressure pump supercharging being delivered to carburator, in carburator, the liquefied natural gas vaporization after supercharging is high-pressure natural gas；
(4) offer can carry out the turbo-expander of expansion work to high-pressure liquefaction natural gas；
(5) high-pressure natural gas that step (3) obtains is delivered to turbo-expander, obtains high-pressure natural gas；
(6) providing gas compressor, the acting utilizing the turbo-expander of step (5) to expand drives this gas compressor；
(7) boil-off gas that liquefied natural gas receiving station obtains enters the gas compressor of step (6), and boil-off gas is carried out supercharging, and the boil-off gas after supercharging is outer defeated.
2. according to the technique described in claim 1, it is characterised in that described low-temp low-pressure liquefied natural gas and boil-off gas are all from liquefied natural gas receiving station.
3. according to the technique described in claim 1, it is characterised in that described high-pressure pump is cryogenic high pressure pump.
4. according to the technique described in claim 1, it is characterised in that the output pressure of step (2) described high-pressure pump is higher than the output pressure of turbo-expander in step (5).
5. according to the technique described in claim 1 or 4, it is characterised in that the output pressure of step (2) described high-pressure pump is higher than the output pressure 0.1～10MPa of turbo-expander in step (5).
6. according to the technique described in claim 5, it is characterised in that the output pressure of step (2) described high-pressure pump is higher than output pressure 0.5～3 MPa of turbo-expander in step (5).
7. a liquefied natural gas receiving station boil-off gas output technique, including herein below:
(1) offer can carry out the high-pressure pump of supercharging to low-temp low-pressure liquefied natural gas；
(2) by being delivered to high-pressure pump through the low-temperature liquefaction natural gas of low pressure immersed pump supercharging, low-temp low-pressure liquefied natural gas is carried out supercharging；
(3) liquefied natural gas after high-pressure pump supercharging being delivered to carburator, in carburator, the liquefied natural gas vaporization after supercharging is high-pressure natural gas；
(4) offer can carry out the turbo-expander of expansion work to high-pressure liquefaction natural gas, and described turbo-expander includes the two stage turbine decompressor of series connection, first order turbo-expander and second level turbo-expander；
(5) high-pressure natural gas that step (3) obtains is delivered to two stage turbine decompressor first order turbo-expander and the second level turbo-expander of series connection successively, obtains high-pressure natural gas；
(6) providing gas compressor, acting when utilizing first order turbo-expander to expand is to drive this gas compressor；
(7) boil-off gas that liquefied natural gas receiving station obtains enters gas compressor, and the boil-off gas after supercharging is directly outer defeated；
(8) acting when second level turbo-expander expands in step (5) is used for the high-pressure pump of actuation step (2).
8. according to the technique described in claim 7, it is characterised in that provide heat exchanger in the middle of first order turbo-expander and second level turbo-expander.
9. according to the technique described in claim 7, it is characterised in that described carburator is seawater open-frame type gasifier.
10. according to the technique described in claim 7, it is characterised in that the output pressure of step (2) described high-pressure pump is higher than output pressure 1～10 MPa of second level turbo-expander in step (5).
11. according to the technique described in claim 7 or 10, it is characterised in that the output pressure of step (2) described high-pressure pump is higher than output pressure 2～10 MPa of second level turbo-expander in step (5).
12. 1 kinds of liquefied natural gas receiving station direct output devices of BOG, it is characterised in that described device includes:
LNG storage tank, it is for receiving the liquefied natural gas of boats and ships or pipelined；Described LNG storage tank includes the immersed pump for low-temperature liquefaction natural gas carries out supercharging, for the moving-out device by boil-off gas (BOG) removal storage tank, with for the liquefied natural gas after supercharging removes the moving-out device of storage tank；
High-pressure pump, it is for being pressurized to low pressure liquefied natural gas compared with the higher pressure of pipe network output pressure；Described high-pressure pump includes for the feeding line by low pressure liquefied natural gas charging to this high-pressure pump, and for the pipeline after supercharging is fed the pipeline to carburator；
Carburator, it is used for the high-pressure liquefaction natural gas vaporization from high-pressure pump is high-pressure natural gas；It includes for the pipeline by high-pressure liquefaction natural gas feed to this carburator, and is delivered to the pipeline of turbo-expander for the natural gas after vaporizing；
Turbo-expander, it is for carrying out expansion work to the high-pressure natural gas from carburator；It feeding line included for just high-pressure natural gas charging to described turbo-expander, is used for the pipeline of the natural gas output after expanding and is used for the device of the acting output of turbo-expander；
Gas compressor, it is for carrying out supercharging to the boil-off gas from LNG storage tank；It includes for the boil-off gas from LNG storage tank is fed the feeding line to this compressor, the pipeline of the boil-off gas output after being used for compression, and is used for inputting the device of turbo-expander acting.
13. according to the device described in claim 12, it is characterised in that described carburator also includes the device for heating carburator.
14. according to the device described in claim 12, it is characterised in that described turbo-expander includes two stage turbine decompressor, i.e. first order turbo-expander and second level turbo-expander.
15. according to the device described in claim 12, it is characterised in that described first order turbo-expander also includes heat exchanger, and heat exchanger is for heating the high-pressure natural gas entering first order turbo-expander.
16. according to the device described in claim 12, it is characterised in that described second level turbo-expander includes heat exchanger, to heat the high-pressure natural gas entering second level turbo-expander.
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