阅读说明：本技术 一种半潜式海上平台lng气化装置及气化方法 (LNG gasification device and method for semi-submersible offshore platform ) 是由 陈海平 黄宇 张超 明红芳 毕晓星 张娜 郝思佳 郭琦 于 2021-01-25 设计创作，主要内容包括：本发明涉及一种半潜式海上平台LNG气化装置及气化方法,包括：半潜式海上平台,半潜式海上平台包括气化平台；LNG气化器,设置于气化平台上,LNG气化器包括：箱体,箱体的底部设置有海水入口,箱体的侧壁上设置有海水出口；LNG输液管,LNG输液管的上端穿过箱体的顶部并设置有LNG入口,其下端安装在箱体内,用于将LNG输送到箱体中；NG输气管,NG输气管的进气口与LNG输液管的出气口连接,用于将气化的LNG输送至外部输气管道；鼓风管,鼓风管的上端穿过箱体的顶部并设置有空气入口,其下端安装在LNG输液管的下方,且鼓风管上设置有若干鼓风孔。本发明装置具有结构简单、节省成本、操作灵活、适用于海洋环境。(The invention relates to a semi-submersible type offshore platform LNG gasification device and a gasification method, comprising the following steps: the semi-submersible offshore platform comprises a gasification platform; LNG vaporizer sets up on the gasification platform, and LNG vaporizer includes: the seawater-collecting box comprises a box body, wherein the bottom of the box body is provided with a seawater inlet, and the side wall of the box body is provided with a seawater outlet; the upper end of the LNG liquid conveying pipe penetrates through the top of the box body and is provided with an LNG inlet, and the lower end of the LNG liquid conveying pipe is arranged in the box body and is used for conveying LNG into the box body; the gas inlet of the NG gas pipe is connected with the gas outlet of the LNG liquid conveying pipe and used for conveying gasified LNG to an external gas conveying pipeline; the upper end of the blast pipe penetrates through the top of the box body and is provided with an air inlet, the lower end of the blast pipe is installed below the LNG liquid conveying pipe, and the blast pipe is provided with a plurality of blast holes. The device has the advantages of simple structure, cost saving, flexible operation and suitability for marine environment.)

1. A semi-submersible offshore platform LNG gasification device, comprising:

a semi-submersible offshore platform comprising a gasification platform (18);

an LNG vaporizer disposed on the vaporization platform (18), the LNG vaporizer comprising:

the seawater desalination device comprises a box body (11), wherein a seawater inlet (13) is formed in the bottom of the box body (11), and a seawater outlet (14) is formed in the side wall of the box body (11);

the upper end of the LNG liquid conveying pipe (5) penetrates through the top of the tank body (11) and is provided with an LNG inlet (7), and the lower end of the LNG liquid conveying pipe is installed in the tank body (11) and is used for conveying LNG into the tank body (11);

the gas inlet of the NG gas pipe (2) is connected with the gas outlet of the LNG liquid conveying pipe (5) and is used for conveying gasified LNG to an external gas conveying pipeline;

the upper end of the blast pipe (4) penetrates through the top of the box body (11) and is provided with an air inlet (8), the lower end of the blast pipe is installed below the LNG liquid conveying pipe (5), and a plurality of blast holes (10-1) are formed in the blast pipe (4) and used for generating bubbles and accelerating the flow of seawater to improve the LNG heat exchange efficiency.

2. The semi-submersible offshore platform LNG vaporization device of claim 1, further comprising:

the supporting frame (15), the said supporting frame (15) is set up in the bottom of the said container body (11);

the lower end of the LNG liquid conveying pipe (5) is divided into a plurality of heat exchange pipes (3), and the plurality of heat exchange pipes (3) are coiled into coiled pipes and are arranged in the support frame (15) side by side or are coiled into a plurality of layers of coiled pipes and are arranged in the support frame (15).

3. The LNG vaporizing device of the semi-submersible offshore platform as claimed in claim 2, wherein the NG gas pipe (2) has its gas inlet connected to the gas outlets of the plurality of heat exchange tubes (3), and the NG gas pipe (2) has its upper end passing through the top of the tank (11) and provided with an NG outlet (1) for connection to an external gas pipe.

4. Semi-submersible offshore platform LNG gasifying device according to claim 3, characterized in that said blast pipe (4) is divided at its lower end into several blast branch pipes (10), several said blast branch pipes (10) are fixed at the bottom of said support frame (15) and located below several said heat exchange pipes (3), several said blast holes (10-1) are evenly distributed on the upper pipe wall of several said blast branch pipes (10).

5. The LNG gasification device of the semi-submersible offshore platform according to claim 4, further comprising a chlorine gas pipe (6), wherein the upper end of the chlorine gas pipe (6) penetrates through the top of the tank body (11) and is provided with a chlorine gas inlet (9), and the lower end of the chlorine gas pipe (6) is in airflow communication connection with the blast pipe (4).

6. The LNG vaporization unit of claim 5, further comprising an overflow weir (12), wherein the overflow weir (12) is of a comb-tooth structure and comprises a baffle and a plurality of turbulence grooves (12-1) uniformly distributed on the baffle, and the overflow weir (12) is fixed at the bottom of the support frame (15) and located at the periphery of the plurality of heat exchange tubes (3) for enabling the liquid in the whole tube bundle region to flow sufficiently for heat exchange.

7. The LNG gasification device of the semi-submersible offshore platform according to claim 6, characterized in that the plurality of heat exchange tubes (3) are arranged in an isosceles triangle shape to enhance the bubble breaking effect, so that the number of bubbles with relatively small diameters is increased, and under the condition of the same air inflow, the liquid is disturbed and enhanced, and the heat transfer effect is enhanced.

8. Semi-submersible offshore platform LNG gasifying device according to claim 7, further comprising a filter screen (16), said filter screen (16) being arranged at said sea water inlet (13) for filtering large particle silt and marine organisms.

9. The LNG gasification device of claim 8, further comprising a working platform (17), wherein the working platform (17) is provided with a blower, a safety facility, the LNG transfer line (5), the NG gas pipe (2), the blower pipe (4) and the chlorine gas pipe (6).

10. A method of vaporizing the semi-submersible offshore platform LNG vaporizer of claim 8 or 9, comprising the steps of:

the semi-submersible offshore platform submerges the platform by increasing the water storage capacity of a ballast water tank of a base (19), opens the seawater inlet (13) and the seawater outlet (14), and immerses the heat exchange tube (3) after seawater is primarily filtered by the filter screen (16), wherein the seawater is in a static state; turning on the blower to be in a working state, enabling air to enter the LNG gasifier through the air inlet (8), conveying the air to the blower pipe (4), finally dispersing the air into the blower branch pipe (10) at the bottom of the LNG gasifier, ascending in the form of bubbles through the blower holes (10-1) on the blower branch pipe (10), and enabling seawater inside the LNG gasifier to flow under the action of bubble rising force; meanwhile, the chlorine inlet (9) is opened, chlorine is injected through the chlorine gas conveying pipe (6), and the chlorine and air are mixed and then enter the LNG gasifier to play a role in killing marine organisms; LNG enters from the LNG inlet (7), enters the heat exchange tube (3) through the LNG infusion tube (5), and forms convection with seawater flowing outside the tube, so that the purpose of heat exchange and gasification is achieved; the gasified natural gas reaches the NG outlet (1) through the NG gas pipe (2) and is then conveyed out through an external pipeline; after heat exchange, the fluid is discharged through the seawater outlet (14).

Technical Field

The invention relates to a semi-submersible type offshore platform LNG gasification device and a gasification method, and belongs to the technical field of LNG transportation and distribution.

Background

At present, the LNG is generally transported internationally in a marine mode, received by a land LNG receiving terminal, stored and regasified and then distributed to users, the mode of regasifying the LNG from marine transportation to land is complex, and with the improvement of the requirement of domestic environmental protection and the rapid development of the LNG industry, the marine LNG gasification process scheme can be adopted for the marine LNG transportation mode, so that marine transportation and marine gasification are realized, and land area does not need to be occupied. However, there are many difficulties to realize the offshore LNG gasification, such as uncertainty of marine environment conditions, and the stability of the offshore platform affects the LNG gasification efficiency. Aiming at the condition that a common offshore platform is lack of an LNG receiving terminal, the design idea of the LNG vaporizer suitable for the marine environment is provided according to different LNG project conditions and the resource conditions are scientifically and reasonably utilized, the research and development of the offshore LNG vaporizer are carried out, and the requirements of vigorously developing independent innovation and developing high-end equipment manufacturing industry in China are met. Therefore, the process scheme of Shanghai LNG gasification is completed, independent patent technologies are developed, and the technology for realizing LNG gasification under different environmental conditions becomes a necessary trend of development.

Disclosure of Invention

The LNG vaporizer is combined with the semi-submersible offshore platform, and based on the traditional vaporizer and a heat exchange mode, the LNG vaporizer for the semi-submersible offshore platform is invented.

In order to achieve the purpose, the invention adopts the following technical scheme:

a semi-submersible offshore platform LNG gasification apparatus, comprising:

a semi-submersible offshore platform comprising a gasification platform;

LNG vaporizer, set up in on the gasification platform, LNG vaporizer includes:

the seawater recycling device comprises a box body, a seawater inlet is formed in the bottom of the box body, and a seawater outlet is formed in the side wall of the box body;

the upper end of the LNG liquid conveying pipe penetrates through the top of the box body and is provided with an LNG inlet, and the lower end of the LNG liquid conveying pipe is installed in the box body and is used for conveying LNG into the box body;

the gas inlet of the NG gas pipe is connected with the gas outlet of the LNG liquid conveying pipe and used for conveying gasified LNG to an external gas conveying pipeline;

the upper end of the blast pipe penetrates through the top of the box body and is provided with an air inlet, the lower end of the blast pipe is installed below the LNG liquid conveying pipe, and the blast pipe is provided with a plurality of blast holes for generating bubbles and accelerating the flow of seawater to improve the LNG heat exchange efficiency.

The LNG vaporizer for a semi-submersible offshore platform preferably further comprises:

the supporting frame is arranged at the bottom of the box body;

the lower end of the LNG liquid conveying pipe is divided into a plurality of heat exchange pipes, and the plurality of heat exchange pipes are coiled into coiled pipes and arranged in the support frame side by side or coiled into a plurality of layers of coiled pipes and arranged in the support frame.

Semi-submersible offshore platform LNG gasification equipment, preferably, the air inlet of NG gas-supply pipe with a plurality of the gas outlet of heat exchange tube is connected, the upper end of NG gas-supply pipe passes the top of box and be provided with NG export (1) for be connected with outside gas transmission pipeline.

Preferably, the lower end of the blast pipe is divided into a plurality of blast branch pipes, the plurality of blast branch pipes are fixed at the bottom of the support frame and positioned below the plurality of heat exchange pipes, and the plurality of blast holes are uniformly distributed on the upper pipe walls of the plurality of blast branch pipes.

The semi-submersible offshore platform LNG gasification device preferably further comprises a chlorine gas conveying pipe, the upper end of the chlorine gas conveying pipe penetrates through the top of the box body and is provided with a chlorine gas inlet, and the lower end of the chlorine gas conveying pipe is in flow communication connection with the blast pipe.

The semi-submersible offshore platform LNG gasification device preferably further comprises an overflow weir, wherein the overflow weir is of a comb-tooth-shaped structure and is composed of a baffle and a plurality of flow disturbing grooves uniformly distributed on the baffle, and the overflow weir is fixed at the bottom of the support frame and positioned at the periphery of the heat exchange tubes and used for enabling liquid in the whole tube bundle area to fully flow for heat exchange.

The semi-submersible offshore platform LNG gasification device is characterized in that a plurality of heat exchange tubes are preferably arranged in an isosceles triangle manner and used for enhancing the bubble breaking effect, so that the number of bubbles with relatively small diameters is increased, liquid is disturbed and enhanced under the condition of the same air inflow, and the heat transfer effect is enhanced.

Semi-submerged formula offshore platform LNG gasification equipment, preferably, still include the filter screen, the filter screen set up in the sea water entrance for filter large granule silt and marine organism.

The semi-submersible offshore platform LNG gasification device preferably further comprises a working platform, wherein the working platform is provided with a blower, safety facilities, an LNG liquid conveying pipe, an NG gas conveying pipe, a blast pipe and a chlorine gas conveying pipe.

Based on the semi-submersible offshore platform LNG gasification device, the invention also provides a gasification method of the device, which comprises the following steps:

the semi-submersible offshore platform submerges the platform by increasing the water storage capacity of the base water ballast tank, and the seawater inlet and the seawater outlet are opened, so that seawater is primarily filtered by the filter screen and then submerges the heat exchange tube, and the seawater is in a static state; turning on the blower to enable the blower to be in a working state, enabling air to enter the LNG vaporizer through the air inlet, conveying the air to the blower pipe, finally dispersing the air into the blower branch pipe at the bottom of the LNG vaporizer, enabling the air to ascend in the form of bubbles through the blower holes in the blower branch pipe, and enabling seawater inside the LNG vaporizer to flow under the action of the rising force of the bubbles; meanwhile, the chlorine inlet is opened, chlorine is injected through the chlorine gas conveying pipe, and the chlorine and air are mixed and then enter the LNG gasifier to play a role in killing marine organisms; LNG enters from the LNG inlet, enters the heat exchange tube through the LNG liquid conveying tube and forms convection with seawater flowing outside the tube, so that the purpose of heat exchange and gasification is achieved; the gasified natural gas reaches the NG outlet through the NG gas pipe and is then conveyed out through an external pipeline; and after heat exchange, the fluid is discharged through the seawater outlet.

Due to the adoption of the technical scheme, the invention has the following advantages:

1. the semi-submersible offshore platform LNG gasification device is an offshore structure working in a shallow water area, land resources do not need to be occupied, the foundation platform is of a floating structure, and LNG gasification and derivation functions can be achieved, so that the problems that onshore LNG gasification stations are difficult to site, long in construction period and high in construction cost are solved, LNG can be stably gasified in different ocean environments, and the influence of sea surface fluctuation on LNG gasification is avoided.

2. The LNG vaporizer is placed in seawater at the offshore location, LNG on an LNG transport ship can be directly vaporized and then transported from a pipeline, and therefore the cost of transporting LNG and seawater to a receiving station by the onshore LNG vaporizer is effectively saved. Air is injected by the air blower and rises in the form of bubbles through the vent holes, seawater outside the heat exchange pipe flows under the action of bubble rising force, and the purpose of exchanging heat with LNG in the pipe to gasify the seawater is achieved, so that power of a water pump is replaced. The LNG vaporizer places the heat exchange part in the tank body, is flexible to operate, simple and compact in structure and saves the occupied area.

3. The LNG heat exchange tube is completely immersed in seawater, and part of marine microorganisms can be attached to materials to cause microbial corrosion.

4. Compared with the traditional LNG vaporizer, the novel LNG vaporizer does not need a combustor, a seawater pump and an intermediate medium, and is simpler in structure, more convenient to operate, lower in cost and more flexible in installation position.

5. The invention has a set of complete LNG gasification system, and the offshore structure can be used as an offshore platform to carry out the LNG gasification process independently, and can also be connected with an offshore LNG storage and unloading ship in series to work. The basic structure of the middle part of the LNG gasification device of the semi-submersible offshore platform adopts a large flat plate of a fixed platform, and the number of LNG gasifiers to be placed is determined according to the demand of the LNG gasification process.

Drawings

FIG. 1 is a front view of a semi-submersible offshore platform LNG vaporization unit provided in accordance with an embodiment of the present invention;

fig. 2 is a top view of the LNG vaporizer for the semi-submersible offshore platform according to the embodiment of the present invention;

fig. 3 is a schematic structural diagram of an LNG vaporizer according to the embodiment of the present invention;

fig. 4 is a schematic structural diagram of an LNG vaporizer according to the embodiment of the present invention;

FIG. 5 is a schematic view of a weir and baffle according to this embodiment of the present invention;

fig. 6 is a schematic structural view of a blower tube according to the embodiment of the present invention;

the reference numerals in the figures are as follows:

1-NG outlet, 1-1 is NG outlet flange; 2-NG gas transmission pipe; 3, heat exchange tubes; 4-a blast pipe; 5-LNG transfer lines; 6-chlorine gas conveying pipe; 7-LNG inlet, 7-1 LNG inlet flange; 8-air inlet, 8-1 is air inlet flange; 9-chlorine inlet, 9-1 chlorine inlet flange; 10-blast branch pipes, 10-1 are blast holes; 11-a box body; 12-an overflow weir, 12-1 is a flow disturbing groove; 13-seawater inlet; 14-a seawater outlet; 15-a support frame; 16-a filter screen; 17-a working platform; 18-a gasification stage; 19-a base; 20-ribbed plate.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention more apparent, the technical solutions of the present invention are described clearly and completely below, and it is obvious that the described embodiments are some, not all embodiments of the present invention. All other embodiments, which can be obtained by a person skilled in the art without any inventive step based on the embodiments of the present invention, are within the scope of the present invention.

Unless defined otherwise, technical or scientific terms used herein shall have the ordinary meaning as understood by one of ordinary skill in the art to which this invention belongs. The use of "first," "second," and similar terms in the present application do not denote any order, quantity, or importance, but rather the terms are used to distinguish one element from another. The word "comprising" or "comprises", and the like, means that the element or item listed before the word covers the element or item listed after the word and its equivalents, but does not exclude other elements or items. The terms "connected" or "coupled" and the like are not restricted to physical or mechanical connections, but may include electrical connections, whether direct or indirect.

As shown in fig. 1 and 2, the present invention relates to a LNG vaporizer for a semi-submersible offshore platform, comprising: a semi-submersible offshore platform comprising a gasification platform 18; LNG vaporizer sets up on gasification platform 18, and LNG vaporizer includes: the seawater desalination device comprises a box body 11, wherein a seawater inlet 13 is formed in the bottom of the box body 11, and a seawater outlet 14 is formed in the side wall of the box body 11; an LNG liquid conveying pipe 5, wherein the upper end of the LNG liquid conveying pipe 5 penetrates through the top of the box body 11 and is provided with an LNG inlet 7, and the lower end of the LNG liquid conveying pipe 5 is installed in the box body 11 and is used for conveying LNG into the box body 11; an air inlet of the NG gas pipe 2 is connected with an air outlet of the LNG liquid conveying pipe 5 and is used for conveying gasified LNG to an external gas conveying pipeline; the upper end of the blast pipe 4 penetrates through the top of the box body 11 and is provided with an air inlet 8, the lower end of the blast pipe 4 is installed below the LNG liquid conveying pipe 5, and the blast pipe 4 is provided with a plurality of blast holes 10-1 for generating bubbles and accelerating the flow of seawater to improve the LNG heat exchange efficiency. The semi-submersible offshore platform LNG gasification device is an offshore structure working in a shallow water area, land resources do not need to be occupied, the foundation platform is of a floating structure, and LNG gasification and derivation functions can be achieved, so that the problems that onshore LNG gasification stations are difficult to site, long in construction period and high in construction cost are solved, LNG can be stably gasified in different ocean environments, and the influence of sea surface fluctuation on LNG gasification is avoided.

The semi-submersible offshore platform is integrally supported by four column legs, the column legs are connected with an upper part (a working platform 17), a middle part (a gasification platform 18) and a lower part (a base 19) of the semi-submersible offshore platform along the vertical direction, and the base 19 consists of two approximately elliptical cylinder structures and is used for controlling the whole platform to ascend and descend; the middle part (gasification platform 18) of the semi-submersible offshore platform is a large fixed flat plate, 10 ribbed plates 20 are connected on the front surface below the flat plate, 9 ribbed plates 20 are connected on the side surface, a novel LNG gasifier is placed in the middle layer, and an LNG heat exchange pipe 13 is required to be immersed by seawater; the uppermost part of the semi-submersible offshore platform is a working platform 17, and the working platform 17 comprises a large blower fixed on the platform, a gas-liquid pipeline of an LNG gasifier and safety facilities. The large blower preferably adopts a Roots blower, and consists of five parts, namely a shell, a wall plate, an impeller, an oil tank and a silencer; the gas-liquid pipeline comprises a blast pipe 4, a chlorine gas conveying pipe 6, an LNG (liquefied natural gas) conveying pipe 5 and an NG (natural gas) conveying pipe 2; safety device includes fire control, detection, security and emergency treatment facility, and work platform 17 below front has 11 floor 20 to connect, and there are 9 floor 20 to connect the side, and there is the guardrail structure platform all around, and the middle opening is convenient for manual work.

In this embodiment, as shown in fig. 3 and 4, it is preferable that the method further includes:

the support frame 15, the support frame 15 is set up in the bottom of the container body 11;

the lower end of the LNG liquid conveying pipe 5 is divided into a plurality of heat exchange pipes 3, and the plurality of heat exchange pipes 3 are coiled into coiled pipes and are arranged in the support frame 15 side by side or are coiled into a plurality of layers of coiled pipes and are arranged in the support frame 15.

In this embodiment, preferably, as shown in fig. 3 and 4, the air inlet of the NG air pipe 2 is connected with the air outlets of the plurality of heat exchange pipes 3, and the upper end of the NG air pipe 2 penetrates through the top of the box body 11 and is provided with an NG outlet 1 for connecting with an external air pipe.

In this embodiment, preferably, as shown in fig. 3 and 4, the lower end of the blast pipe 4 is divided into a plurality of blast branch pipes 10, the plurality of blast branch pipes 10 are fixed at the bottom of the support frame 15 and located below the plurality of heat exchange pipes 3, and the plurality of blast holes 10-1 are uniformly distributed on the upper pipe walls of the plurality of blast branch pipes 10.

In this embodiment, as shown in fig. 3 and 4, it is preferable that the chlorine gas pipe 6 is further included, an upper end of the chlorine gas pipe 6 penetrates through the top of the box body 11 and is provided with a chlorine gas inlet 9, and a lower end of the chlorine gas pipe 6 is in airflow communication connection with the blast pipe 4.

In this embodiment, as shown in fig. 3-5, it is preferable that the evaporator further comprises an overflow weir 12, wherein the overflow weir 12 is a comb-tooth structure and is composed of a baffle and a plurality of turbulence grooves 12-1 uniformly distributed on the baffle, and the overflow weir 12 is fixed at the bottom of the support frame 15 and is located at the periphery of the plurality of heat exchange tubes 3 for enabling the liquid in the whole tube bundle region to flow sufficiently for heat exchange. As shown in fig. 5, which is a partial schematic view of an overflow weir and a weir baffle of an LNG vaporizer, as shown in the figure, a wave-shaped turbulence groove 12-1 is provided on the weir baffle, and the turbulence groove 12-1 may also be in a structural form of "rectangular" or "trapezoidal".

In this embodiment, preferably, the plurality of heat exchange tubes 3 are arranged in an isosceles triangle manner to enhance the bubble breaking effect, so that the number of bubbles with relatively small diameters is increased, and under the condition of the same air inflow, the liquid is disturbed to enhance and the heat transfer effect is enhanced. As shown in FIG. 6, the blast branch pipes 10 may be in the form of a "conical" or "cylindrical" structure, the blast branch pipes 10 are preferably circular and have uniformly distributed air holes on the surface, the diameter of the air holes of the blast branch pipes 10 is preferably 20mm, the diameter of the air holes of the conical blast branch pipes 10 is preferably 18 mm-22 mm, and the diameter of the air holes may vary according to the actual situation.

In this embodiment, it is preferable that the seawater desalination device further includes a filter screen 16, and the filter screen 16 is disposed at the seawater inlet 13 and is used for filtering large-particle silt and marine organisms.

In this embodiment, preferably, the LNG storage tank further comprises a working platform 17, and the working platform 17 is provided with a blower, a safety facility, an LNG transfer pipe 5, an NG gas pipe 2, a blower pipe 4 and a chlorine gas pipe 6.

Based on the semi-submersible offshore platform LNG gasification device, the invention also provides a gasification method of the device, which comprises the following steps:

the semi-submersible offshore platform submerges the platform by increasing the water storage capacity of a ballast water tank of a base 19, and opens a seawater inlet 13 and a seawater outlet 14 to immerse the heat exchange tube 3 after seawater is primarily filtered by a filter screen 16, so that the seawater is in a static state; the method comprises the following steps that a blower is turned on to be in a working state, air enters the LNG vaporizer through an air inlet 8, is conveyed to a blower pipe 4 and is finally dispersed into a blower branch pipe 10 at the bottom of the LNG vaporizer, rises in the form of bubbles through a blower hole 10-1 of the blower branch pipe 10, and seawater in the LNG vaporizer flows under the action of the rising force of the bubbles; meanwhile, a chlorine inlet 9 is opened, chlorine is injected through a chlorine gas delivery pipe 6, and the chlorine and air are mixed and then enter the LNG gasifier to play a role in killing marine organisms; LNG enters from an LNG inlet 7, enters the heat exchange tube 3 through an LNG liquid conveying tube 5, and forms convection with seawater flowing outside the tube, so that the purpose of heat exchange and gasification is achieved; the gasified natural gas reaches an NG outlet 1 through an NG gas pipe 2 and is then conveyed out through an external pipeline; after heat exchange, the fluid is discharged through a seawater outlet 14.

Based on safety and regulatory considerations, the present invention provides the necessary fire, detection, security and emergency treatment facilities, including fire protection systems, such as seawater fire protection systems, water sprinkler systems, dry powder fire protection systems, foam fire protection systems, CO₂Fire extinguishing systems or other gas fire extinguishing systems suitable for LNG, and the like, wherein the fire extinguishing systems are conventional treatment modes for extinguishing the LNG equipment based on regulations; detection and security facilities such as a gas leakage detection system, a liquid leakage detection system, a pressure and temperature monitoring system, and the like; emergency treatment facilities such as pipeline leakage treatment facilities, emergency rescue facilities, escape and refuge facilities, and the like. These systems ensure the safety and order of the whole offshore platformAnd (5) operating.

Finally, it should be noted that: the above examples are only intended to illustrate the technical solution of the present invention, but not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.