CN103403437B - The regasification plant of liquid gas and regasify gas manufacture method - Google Patents

The regasification plant of liquid gas and regasify gas manufacture method Download PDF

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Publication number
CN103403437B
CN103403437B CN201280010015.5A CN201280010015A CN103403437B CN 103403437 B CN103403437 B CN 103403437B CN 201280010015 A CN201280010015 A CN 201280010015A CN 103403437 B CN103403437 B CN 103403437B
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heat exchanger
mentioned
liquid gas
preheating
preheated
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CN103403437A (en
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冈胜
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MITSUBISHI Shipbuilding Corporation
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Mitsubishi Heavy Industries Ltd
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
    • F17C7/00—Methods or apparatus for discharging liquefied, solidified, or compressed gases from pressure vessels, not covered by another subclass
    • F17C7/02—Discharging liquefied gases
    • F17C7/04—Discharging liquefied gases with change of state, e.g. vaporisation
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
    • F17C2201/00—Vessel construction, in particular geometry, arrangement or size
    • F17C2201/05—Size
    • F17C2201/052—Size large (>1000 m3)
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
    • F17C2221/00—Handled fluid, in particular type of fluid
    • F17C2221/03—Mixtures
    • F17C2221/032—Hydrocarbons
    • F17C2221/033—Methane, e.g. natural gas, CNG, LNG, GNL, GNC, PLNG
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
    • F17C2223/00—Handled fluid before transfer, i.e. state of fluid when stored in the vessel or before transfer from the vessel
    • F17C2223/01—Handled fluid before transfer, i.e. state of fluid when stored in the vessel or before transfer from the vessel characterised by the phase
    • F17C2223/0146—Two-phase
    • F17C2223/0153—Liquefied gas, e.g. LPG, GPL
    • F17C2223/0161—Liquefied gas, e.g. LPG, GPL cryogenic, e.g. LNG, GNL, PLNG
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
    • F17C2223/00—Handled fluid before transfer, i.e. state of fluid when stored in the vessel or before transfer from the vessel
    • F17C2223/03—Handled fluid before transfer, i.e. state of fluid when stored in the vessel or before transfer from the vessel characterised by the pressure level
    • F17C2223/033—Small pressure, e.g. for liquefied gas
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
    • F17C2225/00—Handled fluid after transfer, i.e. state of fluid after transfer from the vessel
    • F17C2225/01—Handled fluid after transfer, i.e. state of fluid after transfer from the vessel characterised by the phase
    • F17C2225/0107—Single phase
    • F17C2225/0123—Single phase gaseous, e.g. CNG, GNC
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
    • F17C2225/00—Handled fluid after transfer, i.e. state of fluid after transfer from the vessel
    • F17C2225/03—Handled fluid after transfer, i.e. state of fluid after transfer from the vessel characterised by the pressure level
    • F17C2225/035—High pressure, i.e. between 10 and 80 bars
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
    • F17C2225/00—Handled fluid after transfer, i.e. state of fluid after transfer from the vessel
    • F17C2225/03—Handled fluid after transfer, i.e. state of fluid after transfer from the vessel characterised by the pressure level
    • F17C2225/036—Very high pressure, i.e. above 80 bars
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
    • F17C2227/00—Transfer of fluids, i.e. method or means for transferring the fluid; Heat exchange with the fluid
    • F17C2227/01—Propulsion of the fluid
    • F17C2227/0128—Propulsion of the fluid with pumps or compressors
    • F17C2227/0135—Pumps
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
    • F17C2227/00—Transfer of fluids, i.e. method or means for transferring the fluid; Heat exchange with the fluid
    • F17C2227/03—Heat exchange with the fluid
    • F17C2227/0302—Heat exchange with the fluid by heating
    • F17C2227/0309—Heat exchange with the fluid by heating using another fluid
    • F17C2227/0316—Water heating
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
    • F17C2227/00—Transfer of fluids, i.e. method or means for transferring the fluid; Heat exchange with the fluid
    • F17C2227/03—Heat exchange with the fluid
    • F17C2227/0302—Heat exchange with the fluid by heating
    • F17C2227/0309—Heat exchange with the fluid by heating using another fluid
    • F17C2227/0316—Water heating
    • F17C2227/0318—Water heating using seawater
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
    • F17C2227/00—Transfer of fluids, i.e. method or means for transferring the fluid; Heat exchange with the fluid
    • F17C2227/03—Heat exchange with the fluid
    • F17C2227/0367—Localisation of heat exchange
    • F17C2227/0388—Localisation of heat exchange separate
    • F17C2227/0393—Localisation of heat exchange separate using a vaporiser
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
    • F17C2265/00—Effects achieved by gas storage or gas handling
    • F17C2265/03—Treating the boil-off
    • F17C2265/032—Treating the boil-off by recovery
    • F17C2265/033—Treating the boil-off by recovery with cooling
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
    • F17C2265/00—Effects achieved by gas storage or gas handling
    • F17C2265/05—Regasification
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
    • F17C2270/00—Applications
    • F17C2270/01—Applications for fluid transport or storage
    • F17C2270/0102—Applications for fluid transport or storage on or in the water
    • F17C2270/0105—Ships

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Filling Or Discharging Of Gas Storage Vessels (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Ocean & Marine Engineering (AREA)

Abstract

A kind of preheating carrying out liquid gas with simple structure the regasification plant of liquid gas that can be regasified by the shell-and-tube exchanger of simple structure are provided。Have: preheating heat exchanger (3), to the LNG of flowing in being preheated stream (3a), by the preheating of the gasifying gas of flowing in pre-hot flowpath (3b)；1st shell-and-tube exchanger (5), to the LNG preheated by preheating heat exchanger (3), sea water or clear water is used to regasify, wherein, in pre-hot flowpath (3b), it is directed through the gas that the 1st shell-and-tube exchanger (5) regasifies, and there is the 2nd shell-and-tube exchanger (7), sea water or clear water will be used to regasify by pre-hot flowpath (3b) the LNG that condenses。

Description

The regasification plant of liquid gas and regasify gas manufacture method
Technical field
The present invention relates to a kind of regasification plant regasified by the liquid gas such as LNG and regasify gas manufacture method。
Background technology
In order to by the LNG(stored in storage tank liquefied natural gas) regasify and provide required part, use regasification plant。As this regasification plant, mostly adopt open gasifier (ORV:Open-Rack-typeVaporizer) mode (referring for example to following patent documentation 1)。In this ORV mode, using sea water as thermal source, by an atmosphere sea water being spread to the outer surface of multiple heat pipes of tabular arrangement, making the LNG gasification within heat pipe。But there is problems in that and need more sea water, and be necessary to ensure that the heat-conducting area of marine stream, therefore, it is difficult to miniaturization。So, ORV mode is difficult to be arranged on FSRU(FloatingStorageandRegasificationUnit/ Floating Storage and regasification unit), FPSO(FloatingProductionStorageandOffloading/ Floating Storage Unloading Device) on the boats and ships such as such marine float, LNG ship。
Prior art literature
Patent documentation
Patent documentation 1: Japanese Unexamined Patent Publication 9-14586 publication
Summary of the invention
The problem that invention to solve
In contrast, as the regasification plant of the ratio ORV mode miniaturization that buoyancy aid is arranged with, boats and ships, there is the example using following regasification plant: employ the STV(shell-and-tube gasifier of the shell-and-tube exchanger 100 shown in Fig. 3) regasification plant under mode。
The typical construction of this shell-and-tube exchanger 100 is as shown in the drawing, has: the upstream supervisor 103 that LNG stream enters；Heat pipe 107, is responsible for 103 with upstream and is connected, be set up in parallel multiple；Downstream supervisor 105, the LNG stream having passed through heat pipe 107 enters。In the through hydroecium 109 surrounded by cylindrical body (housing) of each heat pipe 107。Being mainly characterized by as this heat exchanger, hydroecium 109 substantially central portion longitudinally is divided into upstream side hydroecium 109a and downstream hydroecium 109b。In upstream side hydroecium 109a, import sea water (S.W.) from the side, most upstream (for left side figure) of LNG stream, discharge sea water (dotted line with reference to this figure) from the downstream of upstream side hydroecium 109a。That is, in upstream side hydroecium 109a, sea water stream and LNG stream are parallel flows。On the other hand, in the hydroecium 109b of downstream, importing sea water from the most downstream side (for right side figure) of LNG stream, the upstream side of side hydroecium 109b discharges sea water (dotted line with reference in this figure) downstream。That is, in the hydroecium 109b of downstream, sea water stream and LNG stream are relative currents。Therefore, in the side, most upstream that LNG temperature is minimum, use the sea water of high temperature as parallel flow, thus freezing of heat pipe outer surface can be avoided, be relative current in the most downstream of LNG stream, so that it is guaranteed that LNG takes out temperature。
But, the shell-and-tube exchanger 100 of this mode is compared with the shell-and-tube exchanger 100 ' that the hydroecium shown in Fig. 4 is Room 1, structure complexity, relatively costly, and the shortcoming that there is difficult design。
Accordingly, as the composition adopting the shell-and-tube exchanger 100 ' that hydroecium is Room 1 shown in Fig. 4, there is the method preheating LNG with other devices in advance。Such as, it is proposed that IFV(Intermediate-Fluid-typeVaporizer: the intermediary formula gasifier) scheme of mode。Being called in the method for IFV mode arrange preheating step at this, it is at the upstream side of shell-and-tube exchanger, by heating sources such as sea water and indirectly preheats LNG indirectly by anti-freeze type thermal medium via anti-freeze type thermal medium such as propane。By this preheating step, make the LNG inlet temperature of shell-and-tube exchanger rise to and be not likely to produce the temperature freezed, the cheap shell-and-tube exchanger that hydroecium can be adopted to be Room 1。But having the disadvantage in that the required investment of preheating step is relatively big, because using the anti-icing fluid such as propane, process, safeguard more complicated, and equipment structure also becomes complicated。
The present invention proposes in view of the above circumstances, its object is to provide a kind of preheating carrying out liquid gas with simple structure the regasification plant of liquid gas that can be regasified by the heat exchanger of simple structure。
For the method solving problem
For solving the problems referred to above, the regasification plant of the liquid gas of the present invention and regasify gas manufacture method and adopt following methods。
That is, the regasification plant of the liquid gas that the 1st mode of the present invention relates to has: preheating heat exchanger, by the pre-hot fluid of flowing in pre-hot flowpath, the liquid gas of flowing in being preheated stream is preheated；And the 1st heat exchanger, sea water or clear water is used to regasify the liquid gas preheated by this preheating heat exchanger, in above-mentioned pre-hot flowpath, it is directed through the gas that above-mentioned 1st heat exchanger regasifies, the regasification plant of above-mentioned liquid gas has the 2nd heat exchanger, and the 2nd heat exchanger will use sea water or clear water to regasify by above-mentioned pre-hot flowpath the liquid gas that condenses。
In preheating heat exchanger, the gas regasified by the 1st heat exchanger is imported to pre-hot flowpath, and preheats liquid gas。Therefore, use the self heat preheating liquid gas regasified, preheated by the same fluid of flowing in continuous print path, therefore without using other thermal medium such as propane in preheating step, it is possible to simple structure forms preheating step。
And, 1st heat exchanger is directed through the liquid gas of preheating heat exchanger preheating, the liquid gas temperature flowing into the 1st heat exchanger rises, and therefore can reduce the ice freezed or produce because of heat-exchange surface in thermal medium such as heat pipe surrounding seawater or clear water and the probability of the deterioration of heat exchange performance that causes。Therefore, when using shell-and-tube exchanger as the 1st heat exchanger, the shell-and-tube exchanger of the simple construction that hydroecium can be adopted to be Room 1。
Further, the pre-hot flowpath being directed through preheating heat exchanger in the 2nd heat exchanger the liquid gas condensed。When being flowed in pre-hot flowpath by the liquid gas of pre-hot flowpath, heat is provided to the liquid gas of flowing in being preheated stream, temperature declines, but the gasifying gas comparing high temperature with the liquid gas of flowing in being preheated flowing is directed in pre-hot flowpath, because of this composition, can implementation plan so that flow in pre-hot flowpath, cooling, condensation liquid gas, will not be cooled to be flowed into the liquid gas temperature of preheating heat exchanger。Therefore, the liquid gas temperature that can flow into the 2nd heat exchanger rises than liquid gas temperature, thus the same with above-mentioned 1st heat exchanger, it is possible to decrease freeze in thermal medium such as heat pipe surrounding seawater or clear water or the ice that produces because of heat-exchange surface and the probability of the deterioration of heat exchange performance that causes。Therefore, when using shell-and-tube exchanger as the 2nd heat exchanger, the shell-and-tube exchanger of the simple construction that hydroecium can be adopted to be Room 1。
In addition, " liquid gas " will be called from the fluid being preheated stream and pre-hot flowpath outflow of preheating heat exchanger, but and refer not only to the fluid being only made up of liquid phase, be also included within the two-phase fluid gasified or had predetermined moisture in heat exchanger outlet side。
Further, as the 1st heat exchanger and/or the 2nd heat exchanger, it is preferred to use shell-and-tube exchanger, but the present invention is not particularly limited, for instance may also be the heat exchanger of above-mentioned ORV mode。
Further, as the heating medium of the 1st heat exchanger, the 2nd heat exchanger, when using the heating under the secondary closure circuit such as clear water, it is possible to add anti-icing fluid and take thermal medium further freeze countermeasure。
Further, in the regasification plant of the liquid gas related in above-mentioned 1st mode, it is possible to be arranged to make the cooling flowing path of boil-off gas pre-cooling or condensation at above-mentioned preheating heat exchanger,。
There is the situation being provided with re-liquefied equipment such as the boil-off gas produced for the storage tank by store liquefied gas body etc.。In this case, by the cooling flowing path making boil-off gas pre-cooling or condensation is arranged on preheating heat exchanger, boil-off gas can be cooled down, and relatively efficiently preheat liquid gas。
Especially, as described below, it is preferable that to be readily able to be formed the heat-exchangers of the plate type of the fluidising of multiple independent streams, use as preheating heat exchanger。
Further, in the regasification plant of the liquid gas related in above-mentioned 1st mode, above-mentioned preheating heat exchanger may also be heat-exchangers of the plate type。
By making preheating heat exchanger be heat-exchangers of the plate type, it may be achieved miniaturization。
As heat-exchangers of the plate type, specifically include plate-fin, spiral, it is preferred to use stainless steel, aluminium alloy material。
Further, the gas manufacture method that regasifies that the 2nd mode of the present invention relates to has: preheating step, uses preheating heat exchanger, by the pre-hot fluid of flowing in pre-hot flowpath, the liquid gas of flowing in being preheated stream is preheated；And the 1st regasify step, use the 1st heat exchanger, sea water or clear water is used to regasify the liquid gas preheated by above-mentioned preheating step, in above-mentioned pre-hot flowpath, it is directed through the gas that above-mentioned 1st heat exchanger regasifies, the above-mentioned gas manufacture method that regasifies has the 2nd and regasifies step, uses the 2nd heat exchanger, the thermal medium such as sea water or clear water will be used to regasify by above-mentioned pre-hot flowpath the liquid gas that condenses。
In preheating step in preheating heat exchanger, the gas regasified by the 1st heat exchanger is imported to pre-hot flowpath, and preheats liquid gas。Therefore, use the self heat preheating liquid gas regasified, preheated by the same fluid of flowing in continuous print path, therefore without using other thermal medium such as propane in preheating step, it is possible to simple structure forms preheating step。
Further, the 1st in the 1st heat exchanger regasifies in step, is directed through the liquid gas of preheating heat exchanger preheating, and the liquid gas temperature flowing into the 1st heat exchanger rises, and therefore can reduce the probability freezed at heat pipe surrounding seawater or clear water。Therefore, when using shell-and-tube exchanger as the 1st heat exchanger, the shell-and-tube exchanger of the simple construction that hydroecium can be adopted to be Room 1。
Further, the 2nd in the 2nd heat exchanger regasifies in step, the pre-hot flowpath being directed through preheating heat exchanger the liquid gas condensed。When being flowed in pre-hot flowpath by the liquid gas of pre-hot flowpath, heat is provided to the liquid gas of flowing in being preheated stream, temperature declines, but the gasifying gas comparing high temperature with the liquid gas of flowing in being preheated flowing is directed in pre-hot flowpath, because of this composition so that the liquid gas flow in pre-hot flowpath, cool down, condensed will not be cooled to be flowed into the liquid gas temperature of preheating heat exchanger。Therefore, the liquid gas temperature that can flow into the 2nd heat exchanger rises than liquid gas temperature, therefore can reduce the probability freezed at heat pipe surrounding seawater or clear water。Therefore, when using shell-and-tube exchanger as the 2nd heat exchanger, the shell-and-tube exchanger of the simple construction that hydroecium can be adopted to be Room 1。
Additionally, will from preheating heat exchanger be preheated stream and fluid that pre-hot flowpath flows out be called " liquid gas ", but and refer not only to the fluid being only made up of liquid phase, be also included within the gasification liquefaction of heat exchanger outlet or there is the two-phase fluid of predetermined moisture。
Further, as the 1st heat exchanger and/or the 2nd heat exchanger, it is preferred to use shell-and-tube exchanger, but the present invention is not particularly limited, for instance may also be the heat exchanger of above-mentioned ORV mode。
Further, as the heating medium of the 1st heat exchanger, the 2nd heat exchanger, when using the secondary closure circuit such as clear water, it is possible to add anti-icing fluid。
Invention effect
In preheating heat exchanger, use the heat of self regasified by the 1st heat exchanger to preheat liquid gas, preheated by the same fluid of flowing in continuous print path, therefore without using other thermal medium such as propylene in preheating step, it is possible to simple structure preheats。
Further, by preheating liquid gas, it is possible to decrease the probability freezed around the heat pipe of the 1st heat exchanger, the heat exchanger of simple structure can be adopted。
Further, the liquid gas temperature of the 2nd heat exchanger can be flowed into and rise than liquid gas temperature, therefore can reduce heat pipe surrounding seawater or probability that clear water freezes。Therefore the heat exchanger of simple structure can be adopted。
Accompanying drawing explanation
Fig. 1 indicates that the figure of the regasification plant of the liquid gas of the first embodiment of the present invention。
Fig. 2 indicates that the figure of the variation of Fig. 1。
Fig. 3 indicates that hydroecium is the longitudinal sectional view of the shell-and-tube exchanger of Room 2。
Fig. 4 indicates that hydroecium is the longitudinal sectional view of the shell-and-tube exchanger of Room 1。
Detailed description of the invention
The embodiment that the present invention relates to is described referring to accompanying drawing。
(the 1st embodiment)
1st embodiment of the following description present invention。
At FSRU(FloatingStorageandRegasificationUnit), FPSO(FloatingProductionStorageandOffloading) on the boats and ships such as such marine float, LNG ship, LNG storage equipment (liquid gas bunkerage) is set。Fig. 1 represents regasification plant 1, and it is for LNG(liquid gas of will deriving from the LNG storage tank (liquid gas hold-up tank) of this LNG storage equipment) regasify when providing to required part。
As it is shown in figure 1, regasification plant 1 has: the preheating heat exchanger 3 of preheating LNG；1st shell-and-tube exchanger (the 1st heat exchanger) 5, uses sea water or clear water to regasify the liquid gas preheated by preheating heat exchanger 3；2nd shell-and-tube exchanger (the 2nd heat exchanger) 7, uses sea water or clear water to regasify the liquid gas imported from preheating heat exchanger 3。
Preheating heat exchanger 3 is provided with: be preheated stream 3a, imports the LNG sent from LNG storage tank by shifting pump；Pre-hot flowpath 3b, is directed through the gasifying gas that the 1st shell-and-tube exchanger 5 regasifies。
Preheating heat exchanger 3 is heat-exchangers of the plate type。Specifically, including plate-fin, spiral plate type, it is preferred to use stainless steel, aluminium alloy material。
Such as preheat as-160 DEG C～-155 DEG C to-100 DEG C～-40 DEG C by preheating use heat exchanger 3 by being preheated the LNG of stream 3a。Additionally, the fluid after preheating is only called LNG(refer to liquid gas), but be not the fluid being only made up of liquid phase, also include the two-phase fluid with predetermined moisture。
Utilized by the gasifying gas of pre-hot flowpath 3b and the preheating of the LNG by being preheated stream 3a is cooled, for instance be cooled to about 10 DEG C Dao-100 DEG C～-40 DEG C。Can be set by the design of preheating heat exchanger 3 from the pre-hot flowpath 3b temperature of gasifying gas flowed out, but be preferably set to from equal for the LNG temperature being preheated that stream 3a flows out。This is because, so, can make the 1st shell-and-tube exchanger 5 and the 2nd shell-and-tube exchanger 7 is identical capacity。
1st shell-and-tube exchanger 5 is the hydroecium shown in Fig. 4 is the shell-and-tube exchanger of the simple structure of Room 1。In hydroecium, sea water or clear water are imported in the way of to become relative current relative to LNG stream。By the 1st shell-and-tube exchanger 5, the LNG after preheating is such as heated to about 10 DEG C, and is regasified。
The gasifying gas regasified by the 1st shell-and-tube exchanger 5 is as it has been described above, import to the pre-hot flowpath 3b of preheating heat exchanger 3。
2nd shell-and-tube exchanger 7 is the same with the 1st shell-and-tube exchanger 5, be the hydroecium shown in Fig. 4 is the shell-and-tube exchanger of the simple structure of Room 1。In hydroecium, sea water or clear water are imported in the way of to become relative current relative to LNG stream。By the 2nd shell-and-tube exchanger 7, the LNG being cooled down by preheating heat exchanger 3 and being condensed such as is heated to 10 DEG C and is regasified。Additionally, the fluid cooled down by preheating heat exchanger 3 is only called LNG(refer to liquid gas), but be not the fluid being only made up of liquid phase, also include gas phase or there is the two-phase fluid of predetermined moisture。
The gasifying gas regasified by the 2nd shell-and-tube exchanger 7 imports to CNG(Compressednaturalgas/ compressed natural gas) manifold, needs part is provided to afterwards。
Above-mentioned regasification plant 1 is used as described below, regasifies gas thus producing。
It is preheated stream 3a by what the LNG that shifting pump is sent was directed to preheating heat exchanger 3, for instance be preheating to-100 DEG C～-40 DEG C (preheating steps) from LNG storage tank。
LNG after preheating imports to the 1st shell-and-tube exchanger 5, is such as heated to about 10 DEG C by sea water or clear water, and be regasified (the 1st regasifies step)。
The gasifying gas regasified imports to the pre-hot flowpath 3b of preheating heat exchanger 3, by preheating the LNG of flowing in being preheated stream 3a, for instance be cooled to-100 DEG C～-40 DEG C。
Importing to the 2nd shell-and-tube exchanger 7 from the pre-hot flowpath 3b LNG flowed out, be such as heated to about 10 DEG C by sea water or clear water, be regasified (the 2nd regasifies step)。
The gasifying gas regasified imports to CNG manifold, it is provided that to needs part。
Regasification plant 1 according to present embodiment, can play following action effect。
In preheating with, in exchanger 3, the gas regasified by the 1st shell-and-tube exchanger 5 being imported to pre-hot flowpath 3b, preheating is the LNG of flowing in being preheated stream 3a。Therefore, use the self heat preheating LNG regasified, preheated by the same fluid of flowing in continuous print path, therefore without using other thermal medium such as propane in preheating step, it is possible to simple structure forms preheating step。
Further, being directed through the LNG of preheating heat exchanger 3 preheating in the 1st shell-and-tube exchanger 5, the LNG temperature flowing into the 1st shell-and-tube exchanger 5 rises, and therefore prevents freezing at heat pipe surrounding seawater or clear water。Therefore, the shell-and-tube exchanger of the simple construction that hydroecium can be adopted to be Room 1。
Further, the 2nd shell-and-tube exchanger 7 is directed through the LNG of the condensation after the pre-hot flowpath 3b of preheating heat exchanger 3。Its design is: when being flowed in pre-hot flowpath 3b by the LNG of pre-hot flowpath 3b, provides heat to the LNG of flowing in being preheated stream 3a, and temperature declines, but will not be cooled to be flowed into the LNG being preheated stream 3a of preheating heat exchanger 3。Therefore, the LNG temperature that can flow into the 2nd shell-and-tube exchanger 7 rises, thus will not freeze at heat pipe surrounding seawater or clear water。Therefore, the shell-and-tube exchanger of the simple construction that hydroecium can be adopted to be Room 1。Especially, in the present embodiment, make to flow out and be flowed into the LNG of the 1st shell-and-tube exchanger 5 and to flow out from pre-hot flowpath 3b and be flowed into the LNG temperature of the 2nd shell-and-tube exchanger 7 be identical temperature from being preheated stream 3a, therefore can make the 1st shell-and-tube exchanger 5 and the 2nd shell-and-tube exchanger 7 is identical capacity, can deployment tube shell-type exchangers at low cost。
(variation)
Fig. 2 represents the variation of the regasification plant of present embodiment。
This regasification plant 1 ' arranges the cooling flowing path 3c to boil-off gas (hereinafter referred to as " BOG ") pre-cooling or condensation in preheating heat exchanger 3。Other compositions are identical with Fig. 1, and also the description thereof will be omitted for therefore additional same accompanying drawing labelling。
BOG is inevitably generated because invading from the heat of LNG storage tank etc., there is cooling re-liquefied situation。By time re-liquefied for BOG, re-liquefied equipment is arranged near regasification plant 1 '。In this case, the cooling flowing path 3c of pre-cooling or condensation BOG is arranged in preheating heat exchanger 3。Condenser or drainer (CondenserorCondensatetank) is imported to by the BOG of cooling flowing path 3c pre-cooling or condensation。
Therefore, cooling flowing path 3c cools down BOG, and can effectively preheat the LNG of flowing in being preheated stream 3a by BOG。
Especially, in the present embodiment, heat-exchangers of the plate type is used as preheating heat exchanger 3, it is easy to accomplish form the fluidising of multiple independent stream。
Additionally, in the above-described embodiment, list LNG as liquid gas and illustrate, but the invention is not restricted to this, for instance may also be LPG(liquefied petroleum gas), LEG(liquefied ethylene gas) etc. other liquid gas。
Further, in the above-described embodiment, use the 1st shell-and-tube exchanger and the 2nd shell-and-tube exchanger to be illustrated, but the invention is not restricted to this, even other heat exchangers also can obtain the effect of preheating, for instance may also be the heat exchanger of ORV mode。
Symbol description
1,1 ' regasification plant
3 preheating heat exchangers
3a is preheated stream
The pre-hot flowpath of 3b
3c cooling flowing path
5 the 1st shell-and-tube exchangers (the 1st heat exchanger)
7 the 2nd shell-and-tube exchangers (the 2nd heat exchanger)

Claims (4)

1. a regasification plant for liquid gas,
Have: preheating heat exchanger, have and be preheated stream and pre-hot flowpath；
1st heat exchanger, it is connected with the above-mentioned stream that is preheated in the downstream of above-mentioned preheating heat exchanger；And
2nd heat exchanger, it is connected with above-mentioned pre-hot flowpath in the downstream of above-mentioned preheating heat exchanger,
Above-mentioned 1st heat exchanger and/or above-mentioned 2nd heat exchanger are hydroeciums is the shell-and-tube exchanger of Room 1,
The liquid gas of flowing in being preheated stream is preheated by above-mentioned preheating heat exchanger by the pre-hot fluid of flowing in above-mentioned pre-hot flowpath,
The liquid gas preheated by above-mentioned preheating heat exchanger is used sea water or clear water to regasify by above-mentioned 1st heat exchanger,
The gas regasified by above-mentioned 1st heat exchanger is imported into the above-mentioned pre-hot flowpath in the upstream of above-mentioned preheating heat exchanger, in above-mentioned pre-hot flowpath during flowing, to at the above-mentioned liquid gas offer heat being preheated flowing in stream, temperature declines thus condensing, the temperature not being cooled to be flowed into the above-mentioned liquid gas being preheated stream just imports to above-mentioned 2nd heat exchanger
Above-mentioned 2nd heat exchanger will use sea water or clear water to regasify by above-mentioned pre-hot flowpath the liquid gas that condenses,
It is set to be preheated stream thus the identical temperature of the liquid gas that has been preheated with by above-mentioned by above-mentioned pre-hot flowpath the temperature of above-mentioned liquid gas that condenses。
2. the regasification plant of liquid gas according to claim 1, is arranged to make the cooling flowing path of boil-off gas pre-cooling or condensation on above-mentioned preheating heat exchanger。
3. the regasification plant of liquid gas according to claim 1 and 2, above-mentioned preheating heat exchanger is heat-exchangers of the plate type。
4. regasify a gas manufacture method, have:
Preheating step, uses preheating heat exchanger, by the pre-hot fluid of flowing in pre-hot flowpath, the liquid gas of flowing in being preheated stream is preheated；
1st regasifies step, uses the 1st heat exchanger, uses sea water or clear water to regasify the liquid gas preheated by above-mentioned preheating step；And
2nd regasifies step, uses the 2nd heat exchanger, sea water or clear water will be used to regasify by above-mentioned pre-hot flowpath the liquid gas that condenses,
In above-mentioned pre-hot flowpath, it is directed through the gas that above-mentioned 1st heat exchanger regasifies,
When being flowed in above-mentioned pre-hot flowpath by the liquid gas of above-mentioned pre-hot flowpath, the temperature not being cooled to be flowed into the above-mentioned liquid gas being preheated stream just imports to the 2nd heat exchanger,
To be set to be preheated stream thus the identical temperature of the liquid gas that has been preheated with by above-mentioned by above-mentioned pre-hot flowpath the temperature of above-mentioned liquid gas that condenses。
CN201280010015.5A 2011-02-28 2012-02-03 The regasification plant of liquid gas and regasify gas manufacture method Active CN103403437B (en)

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