CN212298539U - Regasification system of marine liquefied natural gas - Google Patents
Regasification system of marine liquefied natural gas Download PDFInfo
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- CN212298539U CN212298539U CN202021799314.XU CN202021799314U CN212298539U CN 212298539 U CN212298539 U CN 212298539U CN 202021799314 U CN202021799314 U CN 202021799314U CN 212298539 U CN212298539 U CN 212298539U
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Abstract
The utility model relates to a regasification system of offshore liquefied natural gas, a liquefied natural gas system, which comprises a booster pump inlet buffer tank, an LNG booster pump, an LNG vaporizer and an NG temperature compensator; the steam system comprises a circulating water pump and a boiler, wherein the output end of the circulating water pump is connected with the inlet of the boiler; a seawater system comprising a seawater preheater; the intermediate medium system comprises an intermediate medium storage tank, an intermediate medium circulating pump, an intermediate medium evaporator and an intermediate medium preheater. The utility model discloses a regasification system adopts two kinds of operation mode of open/closed, and the system can switch with the help of heat transfer module, carries out the free switching between open mode and closed mode according to local conditions.
Description
Technical Field
The utility model relates to a regasification system of marine liquefied natural gas belongs to natural gas technical field.
Background
Compared to onshore Natural Gas receiving stations, Floating Storage Regasification Units (FSRUs) have become more and more important in Natural Gas peak shaving applications due to their advantages of short construction period and relatively low cost.
Currently, most offshore LNG regasification systems are used in the form of Intermediate Fluid Vaporizers (IFVs). The existing gasification systems either use open mode or closed cycle, depending on the sea water conditions in different sea areas. The former uses seawater as a unique heat source, and has higher requirements on seawater temperature and water quality; the latter can avoid the restriction of seawater condition, and the closed circulation of the intermediate medium is realized by using water vapor as a heat source, but the energy consumption is higher than that of an open gasification mode.
Aiming at the situation that seawater can be used as the only heat source in most of the whole year in China water area, but the temperature of the seawater is too low to meet the requirement of regasification heat in part of winter time, a novel opening and closing combined method applicable to the offshore floating LNG storage and regasification device is urgently needed, and the opening and closing mode can be selected according to local conditions and sea area conditions to furthest utilize the seawater heat to reduce energy consumption.
SUMMERY OF THE UTILITY MODEL
To the above outstanding problem, the utility model provides a regasification system of marine liquefied natural gas, this system can effectively ensure marine floating liquefied natural gas to store and regasification device realizes stabilizing safe air feed in the waters of sea water as only heat source through open/close formula combination regasification system.
In the present invention, bog (boil Off gas) is the boil-Off gas of lng, and ng (natural gas) is natural gas.
In order to achieve the purpose, the utility model adopts the following technical proposal:
the utility model discloses an aspect provides a regasification system of marine liquefied natural gas, include:
the liquefied natural gas system comprises a booster pump inlet buffer tank, an LNG booster pump, an LNG vaporizer and an NG temperature compensator; an outlet of the booster pump inlet buffer tank is connected with an input end of the LNG booster pump, an output end of the LNG booster pump is connected with a first inlet of the LNG vaporizer, a first outlet of the LNG vaporizer is connected with a first inlet of the NG temperature compensator, and a first outlet of the NG temperature compensator is a natural gas outlet;
the steam system comprises a circulating water pump and a boiler, wherein the output end of the circulating water pump is connected with the inlet of the boiler;
the seawater system comprises a seawater preheater, wherein a first inlet of the seawater preheater is connected with an outlet of the boiler, a first outlet of the seawater preheater is connected with an input end of the circulating water pump, and a second inlet of the seawater preheater is a seawater inlet;
the intermediate medium system comprises an intermediate medium storage tank, an intermediate medium circulating pump, an intermediate medium evaporator and an intermediate medium preheater, wherein an outlet of the intermediate medium storage tank is connected with an input end of the intermediate medium circulating pump, an output end of the intermediate medium circulating pump is connected with a first inlet of the intermediate medium preheater, a first outlet of the intermediate medium preheater is connected with a second inlet of the NG temperature compensator, a second outlet of the NG temperature compensator is connected with a first inlet of the intermediate medium evaporator, a first outlet of the intermediate medium evaporator is connected with a second inlet of the LNG vaporizer, and a second outlet of the LNG vaporizer is connected with an inlet of the intermediate medium storage tank; and the second outlet and the third outlet of the seawater preheater are respectively connected with the second inlet of the intermediate medium evaporator and the second inlet of the intermediate medium preheater.
The regasification system, preferably, still include boil-off gas processing system, boil-off gas processing system includes the BOG cooler, the first entry of BOG cooler with the output of LNG booster pump is connected, the first export of BOG cooler with the first entry of LNG vaporizer is connected, partly gasified liquefied natural gas passes through in the BOG cooler the second entry of BOG cooler gets into the BOG cooler cools off once more, then passes through the second export of BOG cooler gets into in the booster pump entry buffer tank.
The second outlet of the seawater preheater preferably comprises two branch pipelines, and the two branch pipelines are respectively connected with the second inlet of the intermediate medium evaporator and the second inlet of the intermediate medium preheater.
The regasification system, preferably, the boiler includes a gas boiler or a gas/diesel boiler.
The regasification system, preferably, the intermediate medium includes propane, an aqueous solution of ethylene glycol, or propylene.
A second aspect of the present invention provides a method for operating the above-mentioned regasification system, comprising the steps of:
LNG is mixed with BOG which is cooled in the BOG cooler and returned to the booster pump inlet buffer tank in the booster pump inlet buffer tank and then is conveyed to the LNG booster pump, the LNG booster pump pumps high-pressure LNG, the high-pressure LNG enters the LNG vaporizer and the NG temperature compensator in sequence after heat exchange in the BOG cooler, the LNG vaporizer gasifies the high-pressure LNG into NG, and then the NG temperature compensator further exchanges heat and heats the high-pressure LNG to reach the temperature required by external conveying and then outputs the high-pressure LNG;
the circulating water pump pumps fresh water to the boiler, the boiler heats the fresh water and generates water vapor, the water vapor enters the seawater preheater to exchange heat with seawater in the seawater preheater to obtain preheated seawater, and the fresh water after heat exchange returns to the circulating water pump to realize fresh water circulation;
the preheated seawater is taken as a heat source and enters the intermediate medium evaporator and the intermediate medium preheater in two paths respectively; the intermediate medium circulating pump pumps the intermediate medium in the intermediate medium storage tank to the intermediate medium preheater, the intermediate medium preheated by seawater enters the NG temperature compensator to further compensate the temperature of the gasified natural gas, the intermediate medium after heat exchange enters the intermediate medium evaporator, the intermediate medium is further heated and evaporated by seawater and then enters the LNG vaporizer to gasify the liquefied natural gas therein, and the intermediate medium after heat exchange returns to the intermediate medium storage tank to realize the circulation of the intermediate medium.
The utility model discloses owing to take above technical scheme, it has following advantage:
the utility model discloses a regasification system adopts two kinds of operation mode of open/close formula, and the system can switch with the help of heat transfer module, carries out the free switching between open mode and closed mode according to local conditions, has following technical advantage: the method can adapt to conditions in multiple sea areas, has low sensitivity to sea area motion, and is particularly suitable for cold water sea areas; secondly, the open/close combination can be realized, and the mode switching can be carried out according to local conditions; stable circulation of the intermediate medium can be realized, and controllability of the medium is ensured; and fourthly, the treatment process of the novel BOG cooler can effectively improve the energy utilization rate of the system.
Drawings
FIG. 1 is a schematic flow diagram of a regasification system for LNG of the present invention;
the reference numerals in the figures are as follows:
1-a booster pump inlet buffer tank; 2-LNG booster pump; 3-a BOG cooler; 4-an LNG vaporizer; 5-NG temperature compensator; 6-a seawater preheater; 7-intermediate medium evaporator; 8-an intermediate medium preheater; 9-a circulating water pump; 10-a boiler; 11-intermediate medium reservoir; 12-intermediate medium circulation pump.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention clearer, the technical solutions of the present invention are clearly and completely described below, and it is obvious that the described embodiments are some, but not all embodiments of the present invention. Based on the embodiments in the present invention, all other embodiments obtained by the ordinary person in the art without creative work belong to the protection scope of the present invention.
In the description of the present invention, it should be understood that the terms "first", "second", third ", etc. are used to define the components, and are only used for the convenience of distinguishing the components, and if not stated otherwise, the terms have no special meaning, and thus, should not be construed as limiting the scope of the present invention.
Example 1
As shown in fig. 1, the present embodiment relates to an offshore lng regasification system, including:
the liquefied natural gas system comprises a booster pump inlet buffer tank 1, an LNG booster pump 2, an LNG vaporizer 4 and an NG temperature compensator 5; an outlet of a booster pump inlet buffer tank 1 is connected with an input end of an LNG booster pump 2, an output end of the LNG booster pump 2 is connected with a first inlet of an LNG vaporizer 4, a first outlet of the LNG vaporizer 4 is connected with a first inlet of an NG temperature compensator 5, and a first outlet of the NG temperature compensator 5 is a natural gas outlet;
the steam system comprises a circulating water pump 9 and a boiler 10, wherein the output end of the circulating water pump 9 is connected with the inlet of the boiler 10;
the seawater system comprises a seawater preheater 6, wherein a first inlet of the seawater preheater 6 is connected with an outlet of a boiler 10, a first outlet of the seawater preheater 6 is connected with an input end of a circulating water pump 9, and a second inlet of the seawater preheater 6 is a seawater inlet;
the intermediate medium system comprises an intermediate medium storage tank 11, an intermediate medium circulating pump 12, an intermediate medium evaporator 7 and an intermediate medium preheater 8, wherein an outlet of the intermediate medium storage tank 11 is connected with an input end of the intermediate medium circulating pump 12, an output end of the intermediate medium circulating pump 12 is connected with a first inlet of the intermediate medium preheater 8, a first outlet of the intermediate medium preheater 8 is connected with a second inlet of the NG temperature compensator 5, a second outlet of the NG temperature compensator 5 is connected with a first inlet of the intermediate medium evaporator 7, a first outlet of the intermediate medium evaporator 7 is connected with a second inlet of the LNG vaporizer 4, and a second outlet of the LNG vaporizer 4 is connected with an inlet of the intermediate medium storage tank 11; the second outlet and the third outlet of the seawater preheater 6 are connected to the second inlet of the intermediate medium evaporator 7 and the second inlet of the intermediate medium preheater 8, respectively.
In this embodiment, preferably, the boil-off gas treatment system is further included, the boil-off gas treatment system includes a BOG cooler 3, a first inlet of the BOG cooler 3 is connected to an output end of the LNG booster pump 2, a first outlet of the BOG cooler 3 is connected to a first inlet of the LNG vaporizer 4, and the partially vaporized liquefied natural gas in the BOG cooler 3 enters the BOG cooler 3 through a second inlet of the BOG cooler 3 to be cooled again, and then enters the booster pump inlet buffer tank 1 through a second outlet of the BOG cooler 3 to be fully mixed with the low-pressure LNG and then enters the LNG vaporizer 4 in a liquid phase. The BOG boil-off gas exchanges heat with high-pressure LNG pumped out by an LNG booster pump 2 in a BOG cooler 3, enters a booster pump inlet buffer tank 1, is fully mixed with low-pressure LNG again, and then enters an LNG vaporizer 4 and an NG temperature compensator in a liquid phase.
In this embodiment, preferably, the second outlet of the seawater preheater 6 includes two branch pipelines, the two branch pipelines are respectively connected to the second inlet of the intermediate medium evaporator 7 and the second inlet of the intermediate medium preheater 8, and the two branches of seawater after heat exchange are merged into the drainage pipeline discharge system.
In this embodiment, the seawater system preferably further comprises a seawater pump, and the seawater pump is used for pumping seawater into the seawater preheater 6.
In the present embodiment, it is preferable that the boiler 10 includes a gas boiler and a gas/diesel boiler.
In this embodiment, preferably, the intermediate medium comprises propane, an aqueous solution of ethylene glycol or propylene.
In this embodiment, preferably, when the intermediate medium is propane, the intermediate medium inlet state of the LNG vaporizer 4 is a gas phase, and the intermediate medium outlet state is a liquid phase; the natural gas inlet of the NG temperature compensator 5 is in a gas phase and non-two-phase state; the boil-off gas outlet of the BOG cooler 3 is in a saturated state.
In this embodiment, each heat exchanger or preheater is preferably in the form of, but not limited to, a printed circuit plate heat exchanger, a wound tube heat exchanger, a shell and tube heat exchanger, or a jacketed heat exchanger, although other heat exchangers may be used.
Example 2
As shown in fig. 1, the present embodiment relates to a method for operating an offshore lng regasification system, comprising the steps of:
LNG conveyed from an LNG storage device is mixed with BOG which is cooled in a BOG cooler 3 and returned to the booster pump inlet buffer tank 1 in a booster pump inlet buffer tank 1, and then conveyed to an LNG booster pump 2, the LNG booster pump 2 pumps high-pressure LNG to enter an LNG vaporizer 4 and an NG temperature compensator 5 in sequence after heat exchange in the BOG cooler 3, the LNG vaporizer 4 vaporizes the high-pressure LNG into NG, and then the high-pressure LNG is further subjected to heat exchange and temperature rise through the NG temperature compensator 5 to reach the temperature required by external output and then is output;
the circulating water pump 9 pumps the fresh water to the boiler 10, the boiler 10 heats the fresh water and generates water vapor, the water vapor enters the seawater preheater 6 and exchanges heat with seawater therein to obtain preheated seawater, and the fresh water after heat exchange returns to the circulating water pump 9 to realize fresh water circulation;
the preheated seawater is taken as a heat source and enters an intermediate medium evaporator 7 and an intermediate medium preheater 8 respectively in two paths; the intermediate medium circulating pump 12 pumps the intermediate medium in the intermediate medium storage tank 11 to the intermediate medium preheater 8, the intermediate medium (the heat energy of the intermediate medium is raised) preheated by the seawater enters the NG temperature compensator 5 to further compensate the temperature of the gasified natural gas to the temperature required for external output, the intermediate medium after heat exchange enters the intermediate medium evaporator 7, the intermediate medium is further heated (by the heat exchange of the preheated seawater in the intermediate medium evaporator 7) and then enters the LNG gasifier 4 to gasify the liquefied natural gas therein, and the intermediate medium after heat exchange returns to the intermediate medium storage tank 11 to realize the circulation of the intermediate medium.
Based on the regasification system of example 1, 4 different methods for gasifying liquefied natural gas by the system are provided below.
Example 3
When the temperature of the seawater is high, the system can adopt the single seawater as a heat source, the seawater system does not need to directly enter the intermediate medium evaporator 7 and the intermediate medium preheater 8 through the seawater preheater 6, and the LNG is gasified by utilizing the latent heat or the sensible heat of the intermediate medium.
Example 4
When the temperature of the seawater is low and cannot meet the gasification requirement, the system adopts seawater and water vapor as heat sources together, the water vapor heats the seawater in a seawater preheater 6 to a proper temperature, the preheated seawater enters an intermediate medium evaporator 7 and an intermediate medium preheater 8 in two paths respectively, and the LNG is gasified by utilizing the latent heat or sensible heat of the intermediate medium.
In the above embodiment 3 or 4, the directly-entering seawater or the preheated seawater may enter the intermediate medium evaporator 7 and the intermediate medium preheater 8 separately in two ways, or the seawater may enter the intermediate medium evaporator 7 and the intermediate medium preheater 8 in sequence as one way, and the vaporization of the LNG is achieved by using latent heat or sensible heat of the intermediate medium.
According to the difference of heat exchange media, the intermediate medium can change phase in the circulation process of the system to utilize the latent heat of the intermediate medium, and can also have no phase change, and the LNG in the system is gasified only by utilizing the sensible heat of the intermediate medium.
Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it should be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; such modifications and substitutions do not depart from the spirit and scope of the present invention in its corresponding aspects.
Claims (5)
1. An offshore liquefied natural gas regasification system, comprising:
the liquefied natural gas system comprises a booster pump inlet buffer tank (1), an LNG booster pump (2), an LNG vaporizer (4) and an NG temperature compensator (5); an outlet of the booster pump inlet buffer tank (1) is connected with an input end of the LNG booster pump (2), an output end of the LNG booster pump (2) is connected with a first inlet of the LNG vaporizer (4), a first outlet of the LNG vaporizer (4) is connected with a first inlet of the NG temperature compensator (5), and a first outlet of the NG temperature compensator (5) is a natural gas outlet;
the steam system comprises a circulating water pump (9) and a boiler (10), wherein the output end of the circulating water pump (9) is connected with the inlet of the boiler (10);
the seawater system comprises a seawater preheater (6), wherein a first inlet of the seawater preheater (6) is connected with an outlet of the boiler (10), a first outlet of the seawater preheater (6) is connected with an input end of the circulating water pump (9), and a second inlet of the seawater preheater (6) is a seawater inlet;
the intermediate medium system comprises an intermediate medium storage tank (11), an intermediate medium circulating pump (12), an intermediate medium evaporator (7) and an intermediate medium preheater (8), the outlet of the intermediate medium storage tank (11) is connected with the input end of the intermediate medium circulating pump (12), the output end of the intermediate medium circulating pump (12) is connected with the first inlet of the intermediate medium preheater (8), a first outlet of the intermediate medium preheater (8) is connected with a second inlet of the NG temperature compensator (5), a second outlet of the NG temperature compensator (5) is connected with a first inlet of the intermediate medium evaporator (7), a first outlet of the intermediate medium evaporator (7) is connected with a second inlet of the LNG vaporizer (4), a second outlet of the LNG vaporizer (4) is connected with an inlet of the intermediate medium storage tank (11); and a second outlet and a third outlet of the seawater preheater (6) are respectively connected with a second inlet of the intermediate medium evaporator (7) and a second inlet of the intermediate medium preheater (8).
2. A regasification system according to claim 1 further comprising a boil-off gas processing system comprising a BOG cooler (3), wherein a first inlet of the BOG cooler (3) is connected to an output of the LNG booster pump (2), wherein a first outlet of the BOG cooler (3) is connected to a first inlet of the LNG vaporizer (4), and wherein liquefied natural gas partially vaporized in the BOG cooler (3) enters the BOG cooler (3) through a second inlet of the BOG cooler (3) to be cooled again and then enters the booster pump inlet buffer tank (1) through a second outlet of the BOG cooler (3).
3. A regasification system according to claim 1 wherein the second outlet of the seawater preheater (6) comprises two branch lines, which are connected to the second inlet of the intermediate medium evaporator (7) and the second inlet of the intermediate medium preheater (8), respectively.
4. A regasification system according to claim 1 wherein the boiler (10) comprises a gas boiler or a gas/diesel boiler.
5. The regasification system of claim 1 wherein the intermediate medium comprises propane, ethylene glycol in water or propylene.
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