CN211781973U

CN211781973U - LNG vaporizer

Info

Publication number: CN211781973U
Application number: CN202020393077.0U
Authority: CN
Inventors: 陈海平; 黄宇; 张超; 毕晓星; 宋坤; 许佳伟; 鲁亮; 明红芳; 郭琦; 邱灶杨
Original assignee: CNOOC Gas and Power Group Co Ltd
Current assignee: CNOOC Gas and Power Group Co Ltd
Priority date: 2020-03-25
Filing date: 2020-03-25
Publication date: 2020-10-27
Anticipated expiration: 2030-03-25

Abstract

The utility model discloses a LNG vaporizer, include: the combustion chamber water tank is internally provided with a combustion chamber water tank, the top of the combustion chamber water tank is communicated with the inside of the combustion chamber water tank, and the top and the bottom of the combustion chamber water tank are communicated with the inside of the combustion chamber water tank; the combustion chamber is arranged in the combustion chamber water tank, the top of the combustion chamber extends out of the water tank, the top of the combustion chamber is provided with a burner, the bottom of the combustion chamber is connected with one end of a flue gas pipeline, and the other end of the flue gas pipeline is communicated with the coil pipe water tank; the LNG coil is arranged in the coil water tank, and an inlet and an outlet of the LNG coil extend out of the water tank; the air blowing mechanism is communicated with the combustor through a pipeline and is used for blowing air into the combustor; the utility model discloses a vaporizer compact structure has multiple mode, and the high just economic environmental protection of gasification efficiency can be suitable for the technology demand of the LNG vaporizing station of different station sites, solves the problem of present LNG trade lectotype difficulty, reduces the investment cost.

Description

LNG vaporizer

Technical Field

The utility model relates to a LNG vaporizer, in particular to novel LNG vaporizer of high-efficient compact belongs to LNG gasification transport field in the liquefied natural gas receiving station.

Background

With the improvement of the domestic environmental protection requirement and the development of the LNG industry, each oil and gas company starts to distribute the LNG project and enters the stage of accelerating the construction of the LNG project. According to the difference of site conditions and environmental conditions of each LNG receiving station project, LNG gasifiers with different characteristics are configured, and with the introduction of foreign LNG technologies, three types of LNG gasifiers including an intermediate medium type gasifier (IFV), an open rack gasifier (ORV) and a submerged combustion gasifier (SCV) are fixedly selected, so that although the technologies of the gasifiers are mature, the technical barriers of the LNG gasifiers are caused. Due to the long coastline and the large difference between the north and south environments in China, the three LNG vaporizers are introduced abroad, and along with the development of the LNG receiving stations in China, the three LNG vaporizers are gradually difficult to meet other requirements of the LNG receiving stations in China.

On the one hand, the LNG vaporizer model selection design based on local conditions is provided by scientifically and reasonably utilizing resource conditions due to different LNG project conditions, the technical barrier of the existing LNG vaporizer is broken through, the independent patent technology is developed, and the realization of the technical update of the LNG vaporizing technology becomes the inevitable trend of development. On the other hand, part of the LNG receiving stations have limited project sites or other heat sources near the project, and the domestic needs to arrange an IFV or ORV as a base load type vaporizer and an SCV for emergency or peak shaving use according to the conventional design. The arrangement of two sets of gasifiers has the problems of large occupied area, high investment and maintenance cost and the like. In addition, the submerged combustion type gasifier burns fuel gas and compressed air in a combustion chamber of the gasifier, the burnt gas enters water through a nozzle, gas injection promotes turbulent flow to form high heat transfer rate and heat exchange efficiency, the water is heated, and LNG passes through a stainless steel coil immersed in the water and is heated by hot water to be gasified. The SCV consumes natural gas produced by the receiving station, generally consumes natural gas with a self-treatment amount of about 1.5% as fuel gas, and has nitrogen oxide emission, so that the competitiveness in the aspects of operating cost and environmental protection is insufficient. Therefore, the design of a compact, efficient and multifunctional LNG vaporizer has important practical significance.

Disclosure of Invention

In view of the above problems, it is an object of the present invention to provide an efficient and compact LNG vaporizer with multiple operating modes.

In order to achieve the above purpose, the utility model adopts the following technical scheme: an LNG vaporizer, comprising:

the combustion chamber water tank comprises a water tank, a combustion chamber water tank and a coil water tank, wherein the coil water tank and the combustion chamber water tank are adjacently arranged in the water tank, the top of the coil water tank is communicated with the inside of the water tank, the top and the bottom of the combustion chamber water tank are communicated with the inside of the water tank, and a circulation passage is formed by the top of the coil water tank, an inner cavity of the water tank and the bottom and the top of the combustion chamber water tank;

the combustion chamber is arranged in the combustion chamber water tank, the top of the combustion chamber extends out of the water tank, a combustor is arranged at the top of the combustion chamber, the bottom of the combustion chamber is connected with one end of a flue gas pipeline, and the other end of the flue gas pipeline is communicated with the bottom of the coil pipe water tank;

the LNG coil is arranged in the coil water tank, and an inlet and an outlet of the LNG coil extend out of the water tank;

and the blowing mechanism is communicated with the combustor through a pipeline and is used for blowing air into the combustor.

Preferably, the LNG coil is vertically arranged in the coil water tank, and the LNG coil is inclined upward relative to the bottom surface of the coil water tank.

Preferably, the LNG coil comprises an inner coil, an outer sleeve and a communicating pipe; the inner coil pipe comprises a plurality of straight pipe sections and a plurality of bend pipe sections, the straight pipe sections and the bend pipe sections are alternately connected to form the inner coil pipe with a serpentine structure, the outer sleeve is sleeved outside the straight pipe sections of the inner coil pipe, the two ends of each outer sleeve are sealed, each outer sleeve is provided with two communicating pipes, the two ends of each outer sleeve are distributed in different sides, each communicating pipe is respectively communicated with the outer sleeve corresponding to the two ends of each outer sleeve, and the inlet and the outlet of the inner coil pipe and the outer sleeve extend out of the water tank.

Preferably, the inner coil pipe is provided with a spoiler rod in the straight pipe section, the spoiler rod extends along the axial direction of the straight pipe section of the inner coil pipe, and the cross section of the spoiler rod is in a cross shape, a meter shape or a Z shape.

Preferably, a plurality of guide fin groups are arranged in the internal circumference array of each bent pipe section, and a plurality of guide fins on each guide fin group are fixed on the inner wall of each bent pipe section and spirally distributed around the central axis of each bent pipe section.

Preferably, a plurality of guide fins on each guide fin group are spirally distributed around the central axis of the bent pipe section in a variable pitch; and the thread pitch is distributed along the flowing direction of medium fluid in the bent pipe section, the thread pitch is reduced firstly and then increased, and the radial height of the guide fin in the bent pipe section is less than one fifth of the inner diameter of the pipe of the bent pipe section.

Preferably, the other end of the flue gas pipeline extends into the inner bottom of the coil water tank, the other end of the flue gas pipeline is closed, a plurality of aerators are arranged on the top wall of the flue gas pipeline in the coil water tank, and the aerators are distributed at intervals along the axial direction of the flue gas pipeline.

Preferably, the aerator comprises an air duct arranged on the top wall of the flue gas pipeline and an aeration head arranged at the top of the air duct, and a plurality of air holes are uniformly distributed at the top of the aeration head.

Preferably, a ventilation structure is arranged at the top of the water tank;

the water tank is characterized in that a first inlet is formed in the bottom of one side of the coil water tank, a first outlet is formed in the top of one side of the coil water tank, the first inlet and the first outlet both extend out of the water tank, a second outlet is formed in the bottom of one side of the water tank, and the second outlet is located below the first outlet.

Preferably, an overflow port is communicated with the side wall of the combustion chamber, and the overflow port extends out of the water tank;

the top of the combustion chamber water tank is higher than the top of the coil pipe water tank;

the blower mechanism is a fan.

The utility model adopts the above technical scheme, it has following advantage:

1. the utility model provides a LNG vaporizer has coil pipe basin and combustion chamber basin in the water tank, and the combustion chamber setting is in the combustion chamber basin, and the LNG coil pipe setting is in the coil pipe basin, and the outside of water tank is stretched out and the combustor is installed at the top of combustion chamber, and the bottom intercommunication of flue gas pipeline and coil pipe basin is passed through to the bottom of combustion chamber, the utility model discloses combine submergence burning formula vaporizer and the principle of traditional coiled tube heat exchanger, whole vaporizer compact structure has multiple mode, and gasification efficiency is high and economic environmental protection, can be suitable for the LNG vaporizing station's of different station sites technology demand, solves the problem of present LNG trade lectotype difficulty, reduces investment cost.

2. The utility model provides an LNG vaporizer, the LNG coil pipe comprises an inner coil pipe, an outer sleeve pipe and a communicating pipe; LNG can be introduced into the inner coil pipe and the outer sleeve pipe, the LNG gasification amount is greatly increased, and the gasification efficiency is greatly improved; LNG and seawater can be respectively introduced into the inner coil pipe and the outer sleeve pipe, and the seawater in the outer sleeve pipe and the LNG in the inner coil pipe perform countercurrent heat exchange, so that the heat exchange efficiency is greatly improved, the heat transfer area is saved, the seawater and the LNG are saved, and the investment cost is reduced.

3. The LNG vaporizer provided by the utility model is provided with a plurality of guide fin groups in the internal circumference array of the bend section, a plurality of guide fins on each guide fin group are fixed on the inner wall of the bend section, and are spirally distributed around the central axis of the bend section; when fluid flows through the bend section, the internal fluid flow line is changed into the spiral direction from the concentric circle of the bend section, the turbulence characteristic of the flow process is increased, boundary layer separation and secondary vortex caused by the fluid flowing in the bend section are reduced, the corrosion rate of the bend section is reduced, and the service life of the LNG coil is prolonged.

Drawings

Fig. 1 is a schematic view of the overall structure of the present invention;

fig. 2 is a schematic cross-sectional structure diagram of the LNG coil of the present invention;

fig. 3 is a distribution schematic diagram of the LNG coil elbow fin of the present invention;

fig. 4 is a schematic structural diagram of the aerator of the present invention.

In the figure, 1, a water tank; 11. a coil water tank; 111. a first access port; 112. a first discharge port; 12. a combustion chamber water tank; 13. a ventilation structure; 14. a first discharge port; 2. a combustion chamber; 21. a submerged burner; 22. a flue gas duct; 23. an overflow port; 3. an LNG coil pipe; 31. an inner coil pipe; 311. a straight pipe section; 312. bending the pipe section; 32. an outer sleeve; 33. a communicating pipe; 34. a spoiler bar; 35. a guide fin group; 4. a blower mechanism; 5. an aerator; 51. an air duct; 52. an aeration head; 53. and (4) air holes.

Detailed Description

The preferred embodiments of the present invention will be described in detail below with reference to the accompanying drawings so that the objects, features and advantages of the invention can be more clearly understood. It should be understood that the embodiments shown in the drawings are not intended as limitations on the scope of the invention, but are merely illustrative of the true spirit of the technical solution of the invention.

As shown in fig. 1, the utility model provides a pair of LNG vaporizer, include:

the combustion chamber water tank comprises a water tank 1, wherein a coil water tank 11 and a combustion chamber water tank 12 are adjacently arranged in the water tank 1, the top of the coil water tank 11 is communicated with the inside of the water tank 1, the top and the bottom of the combustion chamber water tank 12 are communicated with the inside of the water tank 1, and a circulation passage is formed by the top of the coil water tank 11, an inner cavity of the water tank 1 and the bottom and the top of the combustion chamber water tank 12;

the combustion chamber 2 is arranged in the combustion chamber water tank 12, the top of the combustion chamber 2 extends out of the water tank 1, the top of the combustion chamber 2 is provided with a combustor 21, the bottom of the combustion chamber 2 is connected with one end of a flue gas pipeline 22, and the other end of the flue gas pipeline 22 is communicated with the bottom of the coil water tank 11;

the LNG coil 3 is arranged in the coil water tank 11, and an inlet and an outlet of the LNG coil 3 extend out of the water tank 1;

and an air blowing means 4 communicating with the burner 21 through a pipeline for blowing air into the burner 21.

In a preferred embodiment, the LNG coil 3 is vertically disposed in the coil water tank 11, the LNG coil 3 is inclined upward relative to the bottom surface of the coil water tank 11, the inclination angle is preferably 5 to 30 °, and the LNG coil 3 is inclined at a certain inclination angle, so that the conditions of bubble flow, block flow, annular flow and the like during gas-liquid two-phase flow in the inner coil can be avoided, and the blockage caused by accumulation of a gas phase above the LNG coil can be avoided.

In a preferred embodiment, as shown in fig. 1 and 2, the LNG coil 3 includes an inner coil 31, an outer sleeve 32, and a communicating pipe 33; the inner coil 31 includes a plurality of straight tube sections 311 and a plurality of bend sections 312, straight tube section 311 and bend sections 312 connect the inner coil who constitutes serpentine structure in turn, outer tube 32 is all set up in the outside of the straight tube section 311 of inner coil 31, the both ends of each outer tube 32 are sealed, set up two communicating tubes 33 on each outer tube 32, and two communicating tubes 33 are the unilateral and distribute at the both ends of outer tube 32, the both ends of each communicating tube 33 communicate with the outer tube 32 that corresponds the side respectively, and then make a plurality of outer tubes 32 communicate in proper order, the entry and the export of inner coil 31 and outer tube 32 all stretch out the outside of water tank 1.

In a preferred embodiment, as shown in fig. 2, a spoiler bar 34 is disposed inside the straight pipe section 311 of the inner coil 31, so as to increase the turbulent motion of the fluid inside the inner coil 31, increase the heat transfer coefficient, and increase the heat transfer efficiency between the pipe wall of the inner coil 31 and the internal fluid, thereby increasing the gasification efficiency.

In a preferred embodiment, the spoiler bar 34 extends along the axial direction of the straight pipe section 311 of the inner coil 31, the cross section of the spoiler bar 34 is cross-shaped, and the cross section of the spoiler bar 34 can also be m-shaped or Z-shaped, both of which can increase the heat transfer efficiency between the pipe wall of the inner coil 31 and the internal fluid.

In a preferred embodiment, as shown in fig. 1 and 3, a plurality of guide fin sets 35 are arranged in an array on the inner circumference of each bent pipe section 312, and a plurality of guide fins on each guide fin set 35 are fixed on the inner wall of the bent pipe section 312 and are distributed spirally around the central axis of the bent pipe section 312 for spirally guiding the medium fluid flowing through the bent pipe section 312 of the inner coil 31. Vortex flow in the bent pipe section 312 is avoided, the scouring speed of the bent pipe is reduced, and the corrosion speed of the LNG coil pipe is reduced.

In a preferred embodiment, the plurality of guide fins on each guide fin group 35 are distributed in a spiral with a variable pitch around the central axis of the bent pipe section 312; and the thread pitch is distributed along the flowing direction of the medium fluid in the bent pipe section 312, the thread pitch is firstly reduced and then increased, and the radial height of the guide fins in the bent pipe section 312 is less than one fifth of the inner diameter of the pipe of the bent pipe section 312.

In a preferred embodiment, as shown in fig. 1 and 4, the other end of the flue gas duct 22 extends into the inner bottom of the coil water tank 11, the other end of the flue gas duct 22 is closed, a plurality of aerators 5 are arranged on the top wall of the flue gas duct 22 in the coil water tank 11, the aerators 5 are distributed at intervals along the axial direction of the flue gas duct 22, the combustion flue gas generated in the combustion chamber 2 enters the flue gas duct 22 and is ejected more uniformly by the aerators 5, a large number of bubbles can be formed at the bottom of the coil water tank 11, the seawater turbulence in the coil water tank is increased, and the heat transfer efficiency is improved.

In a preferred embodiment, the aerator 5 comprises an air duct 51 arranged on the top wall of the flue gas duct 22 and an aeration head 52 arranged on the top of the air duct 51, wherein a plurality of air holes 53 are uniformly distributed on the top of the aeration head, and the diameter of each air hole 53 is preferably 2 mm-5 mm; the aeration head 53 can be in the form of round, square or diamond, and the diameter of the air hole can be changed according to the actual situation.

In a preferred embodiment, an overflow port 23 is communicated with the side wall of the combustion chamber 2, the overflow port 23 extends out of the water tank 1, and the seawater in the combustion chamber 2 is discharged at the same time, so that the damage of the combustor caused by the seawater immersion is avoided.

In a preferred embodiment, the top of the combustor basket 12 is higher than the top of the coil basket 11.

In a preferred embodiment, a ventilation structure 13 is provided on the top of the water tank 1; in particular, the ventilation structure 13 may be a chimney.

In a preferred embodiment, in order to conveniently add and discharge the heat exchange medium (such as seawater) into and from the coil water tank 11, a first inlet 111 is arranged at the bottom of one side of the coil water tank 11, a first outlet 112 is arranged at the top of one side of the coil water tank 11, both the first inlet 111 and the first outlet 112 extend out of the water tank 1, and in order to conveniently discharge the heat exchange medium in the water tank 1, a second outlet 14 is arranged at the bottom of one side of the water tank 1, and the second outlet 14 is positioned below the first outlet 112; valves are provided at the first inlet port, the first outlet port 112, and the second outlet port 14.

In a preferred embodiment, the blowing mechanism 4 may be a fan.

The working process of the utility model is as follows:

the first working mode is as follows: LNG gasification is carried out by using an immersion combustion mode, seawater is filled into a coil water tank 11 through a first inlet 111 of the coil water tank 11 until an LNG coil 3 is immersed, water is continuously added to enable the seawater to overflow into a water tank 1 and fill a combustion chamber water tank 12, air is conveyed through a fan and is mixed and combusted with fuel gas in a combustor 21, combustion flue gas is conveyed to an aerator 5 through a flue gas pipeline 22 communicated with the bottom of a combustion chamber 2 and is sprayed into the coil water tank 11 through the aerator 5, the flue gas moves from bottom to top in the coil water tank 11 and heats the seawater in the coil water tank, meanwhile, LNG is continuously introduced from inlets of an inner coil 31 and an outer sleeve 32 on the LNG coil 3, hot water in the coil water tank 11 enables LNG in the outer sleeve 32 of the LNG coil 3 to be gasified, and the gasified natural gas gasifies the LNG in the inner coil 31; the flue gas is at the continuous in-process that goes up of coil pipe basin 11, water in the coil pipe basin 11 constantly overflows and gets into in the circulation route, and the water in the combustion chamber basin 12 then constantly overflows and gets into in the coil pipe basin 11 for the hot water of coil pipe basin 11 forms the circulation with the cold water in the combustion chamber basin 12, and cold water and hot water circulation can make the water in the coil pipe basin 11 keep a relatively steady temperature, avoid appearing the continuous heating of bottom flue gas of coil pipe basin 11 and cause the too high condition of temperature.

And a second working mode: different media are introduced into the inner coil 31 and the outer sleeve 32 of the LNG coil 3 to gasify the LNG;

the fan and the burner 21 are stopped, the second outlet 14 of the water tank 1 and the first inlet 111 of the coil water tank 11 are opened to empty the water in the water tank 1 and the coil water tank 11, at this time, LNG and seawater are respectively introduced from the inlets of the inner coil 31 and the outer sleeve 32 of the LNG coil 3, the seawater in the outer sleeve 32 of the LNG coil 3 and the LNG in the inner coil 31 perform countercurrent heat exchange to gasify the LNG, the gasified LNG is output from the outlet of the inner coil 31, and the seawater is discharged from the outlet of the outer sleeve 32.

And a third working mode: in order to use the waste hot water to heat and gasify the LNG, the blower and the burner 21 are stopped, the waste hot water is input from the first inlet 111 of the coil water tank 11, the LNG is introduced into both the inlets of the inner coil 31 and the outer sleeve 32 of the LNG coil 3, the waste hot water in the coil water tank 11 gasifies the LNG in the outer sleeve 32, the gasified natural gas gasifies the LNG in the inner coil 31, finally the gasified natural gas in the inner coil 31 and the outer sleeve 32 is output from the corresponding outlets, the waste hot water exchanges heat with the LNG in the LNG coil 3 and is then discharged from the first outlet 112 of the coil water tank 11, and the waste hot water can be pumped out by means of a water pump.

The utility model discloses combine submergence burning formula vaporizer and the principle of tradition around tubular heat exchanger, make the utility model discloses multiple mode has, can be applicable to the technology demand of the LNG vaporizing station of different station sites, solve the problem of present LNG trade lectotype difficulty, reduce the investment cost, form coil pipe basin 11 and combustion chamber basin 12 in water tank 1, combustion chamber 2 sets up in combustion chamber basin 12, LNG coil pipe 3 sets up in coil pipe basin 11, make the compact structure of whole LNG vaporizer, no matter which kind of mode homoenergetic gasifies LNG well, convenient operation is swift, gasification efficiency is high.

The present invention has been described only with reference to the above embodiments, and the structure, arrangement position and connection of the components may be changed. On the basis of the technical scheme of the utility model, the all sides according to the utility model discloses the principle is all not excluded to the improvement that individual part goes on or the transform of equivalence the utility model discloses a protection scope is outside.

Claims

1. An LNG vaporizer, comprising:

the water tank (1) is internally provided with a coil water tank (11) and a combustion chamber water tank (12) which are adjacently arranged, the top of the coil water tank (11) is communicated with the inside of the water tank (1), the top and the bottom of the combustion chamber water tank (12) are communicated with the inside of the water tank (1), and a circulation passage is formed by the top of the coil water tank (11), the inner cavity of the water tank (1) and the bottom and the top of the combustion chamber water tank (12);

the combustion chamber (2) is arranged in the combustion chamber water tank (12), the top of the combustion chamber (2) extends out of the water tank (1), a combustor (21) is installed at the top of the combustion chamber (2), the bottom of the combustion chamber (2) is connected with one end of a flue gas pipeline (22), and the other end of the flue gas pipeline (22) is communicated with the bottom of the coil water tank (11);

the LNG coil (3) is arranged in the coil water tank (11), and an inlet and an outlet of the LNG coil (3) extend out of the water tank (1);

and the air blowing mechanism (4) is communicated with the combustor (21) through a pipeline and is used for blowing air into the combustor (21).

2. The LNG vaporizer of claim 1, wherein:

the LNG coil (3) is vertically arranged in the coil water tank (11), and the LNG coil (3) is inclined upwards relative to the bottom surface of the coil water tank (11).

3. An LNG vaporizer according to claim 1 or 2, wherein:

the LNG coil (3) comprises an inner coil (31), an outer sleeve (32) and a communicating pipe (33); interior coil pipe (31) include a plurality of straight tube sections (311) and a plurality of bend section (312), straight tube section (311) and bend section (312) are connected in turn and are constituted serpentine's interior coil pipe of straight tube section (311) of interior coil pipe (31) outside all overlap and put outer tube (32), each the both ends of outer tube (32) are sealed, at each set up two communicating pipes (33) on outer tube (32), and two communicating pipes (33) are in the both ends of outer tube (32) are the unilateral and distribute, each the both ends of communicating pipe (33) respectively with correspond the side outer tube (32) intercommunication, the entry and the export of interior coil pipe (31) and outer tube (32) all stretch out the outside of water tank (1).

4. An LNG vaporizer according to claim 3, wherein:

inner coil pipe (31) be provided with spoiler bar (34) in straight tube section (311), spoiler bar (34) are followed the axial extension of straight tube section (311) of inner coil pipe (31), the cross-section of spoiler bar (34) is cross, rice font or zigzag.

5. An LNG vaporizer according to claim 3, wherein: each inside circumference array of bend section (312) sets up multichannel guide fin group (35), every a plurality of guide fins on guide fin group (35) are fixed on the inner wall of bend section (312), and wind the central axis of bend section (312) is the spiral and distributes.

6. The LNG vaporizer of claim 5, wherein: a plurality of guide fins on each guide fin group (35) are spirally distributed in a variable-pitch manner around the central axis of the bent pipe section (312); the thread pitch is distributed along the flowing direction of medium fluid in the bent pipe section (312) in a way of firstly reducing and then increasing, and the radial height of the guide fins in the bent pipe section (312) is smaller than one fifth of the inner diameter of the pipe of the bent pipe section (312).

7. The LNG vaporizer of claim 1, wherein: the other end of the flue gas pipeline (22) extends into the inner bottom of the coil water tank (11), the other end of the flue gas pipeline (22) is closed, a plurality of aerators (5) are arranged on the top wall of the flue gas pipeline (22) in the coil water tank (11), and the aerators (5) are distributed at intervals along the axial direction of the flue gas pipeline (22).

8. The LNG vaporizer of claim 7, wherein: the aerator (5) comprises an air duct (51) arranged on the top wall of the flue gas pipeline (22) and an aeration head (52) arranged on the top of the air duct (51), wherein a plurality of air holes (53) are uniformly distributed on the top of the aeration head (52).

9. The LNG vaporizer of claim 1, wherein: a ventilation structure (13) is arranged at the top of the water tank (1);

the coil water tank is characterized in that a first inlet (111) is arranged at the bottom of one side of the coil water tank (11), a first outlet (112) is arranged at the top of one side of the coil water tank (11), the first inlet (111) and the first outlet (112) both extend out of the water tank (1), a second outlet (14) is arranged at the bottom of one side of the water tank (1), and the second outlet (14) is located below the first outlet (112).

10. The LNG vaporizer of claim 1, wherein: an overflow port (23) is communicated with the side wall of the combustion chamber (2), and the overflow port (23) extends out of the water tank (1);

the top of the combustion chamber water tank (12) is higher than the top of the coil pipe water tank (11);

the blower mechanism (4) is a fan.