CN113188033A

CN113188033A - LNG low-temperature transportation tank car

Info

Publication number: CN113188033A
Application number: CN202110384910.4A
Authority: CN
Inventors: 崔闻天; 唐志财; 刘珂帆; 于淼; 李佳; 朱建斗; 宋春明
Original assignee: Xinxing Energy Equipment Co Ltd
Current assignee: Xinxing Energy Equipment Co Ltd
Priority date: 2021-04-09
Filing date: 2021-04-09
Publication date: 2021-07-30

Abstract

The invention discloses an LNG low-temperature transport tank wagon, which comprises a semitrailer chassis travelling mechanism and a low-temperature liquefied natural gas mobile storage tank, wherein the storage tank comprises a storage tank body and an operation box, the storage tank body is of a horizontal double-cylinder high-vacuum multilayer heat-insulation low-temperature container structure, an inner container is made of austenitic stainless steel plates, a wave-proof device is arranged inside the storage tank body, the wave-proof device comprises a central tube and a support plate, the axis of the central tube is superposed with the axis of the inner container, the support plate is horn-shaped, an opening at the small end of the support plate is welded with the outer surface of the central tube, an opening at the large end of the support plate is welded with the inner surface of the inner container, the wave-proof device effectively reduces the impact and the vibration of liquid in each direction in the tank body in the driving process of a vehicle, dozens of layers of high-heat-insulation aluminum foil paper are wound on the outer wall of the inner container, glass fiber paper is padded between the aluminum foil paper, and high-vacuum technical treatment is carried out between interlayers, so that the storage tank can achieve the super-insulation performance, the outer container is made of low alloy steel plate.

Description

LNG low-temperature transportation tank car

Technical Field

The invention relates to the technical field of cryogenic heat-insulation pressure vessel storage and transportation equipment, in particular to an LNG low-temperature transportation tank car.

Background

Liquefied natural gas is a high-efficiency clean energy source and is the most ideal fuel for protecting the environment, the liquefied natural gas industry in China is in the stage of vigorous development at present and is widely applied to the aspects of industry, traffic, civilian use and the like, the main component of the liquefied natural gas is liquefied methane, the content of the liquefied methane accounts for more than 90%, and other components also comprise ethane, propane, ethylene and the like, the liquefied natural gas and the liquefied natural gas belong to flammable media, and along with the rapid development of the industrial gas industry in the world at present, in order to improve the transportation and storage efficiency of gas and reduce the transportation and storage cost, the liquidization becomes one of important directions of the development of the industrial gas industry, and correspondingly drives the construction of low-temperature heat-insulation pressure containers in China.

Disclosure of Invention

The invention aims to provide an LNG low-temperature transport tank car which has the characteristics of higher transport efficiency, lower ton kilometer cost and larger one-way transport capacity, and has good safety, maneuverability and reliability.

In order to achieve the purpose, the invention provides the following technical scheme: LNG low-temperature transport tank wagon, including semitrailer chassis running gear and low-temperature liquefied natural gas portable storage tank, the storage tank comprises storage tank body and control box, the storage tank body is the high vacuum multilayer heat insulation low-temperature container structure of horizontal pair of drum, the inner container is made for austenitic stainless steel sheet material, the inside is equipped with the anti-wave device, the said anti-wave device includes center tube and backup pad, the axis of the center tube coincides with axis of the inner container, the backup pad is horn-shaped, its small end opening part and outer surface welding of center tube, the large end opening part and inner surface welding of inner container, the anti-wave device has reduced the impact and oscillation of the liquid in the tank body to all directions in the vehicle in the course of going effectively, the outer wall of the inner container twines dozens of layers of aluminium foil paper of high heat insulation performance, there is glass fiber paper between the aluminium foil paper, and carry on the high vacuum technology to process among the interlayeres, make the storage tank reach the super heat insulation performance, in order to uniformly cool an inner container, reduce the cold impact of liquid and stabilize the whole vehicle when liquefied natural gas is filled, the top of the inner container is provided with a set of liquid spraying device, a shell is made of a low-alloy steel plate, the top of the shell is provided with a safety explosion-proof device, the tank body explosion caused by the leakage of the inner container is prevented and treated, in order to reduce the interlayer space and increase the volume of the inner container, a channel steel ring for maintaining the external pressure stability of the shell is arranged outside and welded with the shell, the maximization of the volume of the tank body is effectively realized on the premise of meeting the national standard and the industrial standard, in order to maintain the vacuum degree of the interlayer, two molecular sieve low-temperature adsorption devices are arranged on a cylinder body of the inner container, and a normal-temperature adsorption material palladium oxide is placed between binding layers; a composite supporting structure of radial combined support is adopted between the inner container and the outer shell, and one end of the composite supporting structure close to the valve and the instrument is fixed; the other end slides to compensate the expansion and contraction of the material, the radial combined support is divided into two groups, each group comprises four supporting points, one group of supporting points is designed for preventing the inner container from rotating annularly and impacting axially so as to ensure that the storage tank cannot generate relative displacement and structural deformation between the inner container and the shell due to bumping in operation and the phenomenon that the inner container breaks the support and the pipeline due to shrinking after being filled with liquefied natural gas, various pipelines, valves, instruments and safety accessories of the storage tank are intensively arranged in an operation box so as to be beneficial to operation and management, the rear bottom of the storage tank is welded with a strip-shaped support, the strip-shaped support is connected with a underframe frame by adopting a high-strength bolt and is added with a rubber filler strip for damping, the train has the characteristics of compact structure, convenient operation and safe and reliable operation performance, meanwhile, the invention reduces the dead weight of the equipment to the maximum extent so as to reserve the maximum weight, the system has the characteristics of higher transportation efficiency, lower ton kilometer cost and larger one-way transport capacity, and has good safety, maneuverability and reliability.

Drawings

FIG. 1 is a schematic structural diagram of an LNG cryogenic transport tanker;

FIG. 2 is an assembly view of a tank body of the LNG cryogenic carrier tank car;

FIG. 3 is an enlarged view of II in FIG. 2;

FIG. 4 is an enlarged view of I in FIG. 2;

FIG. 5 is a cross-sectional view taken along line B-B of FIG. 4;

FIG. 6 is a side view of the wave arrestor;

FIG. 7 is a schematic cross-sectional view of the wave-breaking device;

fig. 8 is a schematic view of a channel ring in a section along a-a in fig. 2.

In the figure: 1. towing the locomotive; 2. a housing; 3. sealing the inner container; 4. a traveling mechanism; 5. a control box; 6. a molecular sieve tube; 7. heat-insulating coated paper; 8. a vacuum port device; 9. a wave preventing device; 10. a central tube; 11. a support plate; 12. a steel ring is arranged; 13. a first filling tube; 14. a second filling tube; 15. angle steel; 16. a reinforcing plate; 17. a glass fiber reinforced plastic pillar; 18. a reinforcing plate; 19. a plug; 20. glass fiber paper; 21. a normal temperature hydrogen absorbing agent.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

In the description of the present invention, it is to be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "disposed," "connected," and the like are to be construed broadly, such as "connected," which may be fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.

Referring to fig. 1-8, a cryogenic transport tanker for LNG has the characteristics of higher transport efficiency, lower cost per ton/kilometer, and greater one-way transport capacity, and has good safety, mobility, and reliability, fig. 1 is a schematic structural diagram of the cryogenic transport tanker for LNG, as shown in the figure, the cryogenic transport tanker for LNG includes a tractor head 1, a sealed housing 2, a sealed inner container 3 disposed in the housing 2, a traveling mechanism 4, and a valve instrument operation control box 5, the housing 2 and the sealed inner container 3 are both horizontal cylindrical tank bodies formed by rolling and welding steel plates, two ends are butterfly-shaped end sockets, the sealed inner container 3 is made of S30408 austenitic stainless steel, the housing 2 is made of Q345R carbon structural steel, a plurality of channel steel rings 12 are welded on the outer surface of the cylinder body of the housing 2 for enhancing the strength, rigidity, and stability of the housing 2, a molecular sieve tube 6 filled with an adsorbent is welded on the sealed inner container 3, the outer surface of the sealed inner container 3 is wound with heat insulation coating paper 7, the heat insulation coating paper 7 is formed by winding a plurality of layers of aluminum foil paper and glass fiber paper 20 at intervals, the number of winding layers is 40, the thickness after binding is 20-22 mm, wherein the glass fiber paper 20 is tightly attached to the outer wall of the sealed inner container 3, the selection of the number and the thickness of the winding layers is proved to be most economical through low-temperature performance tests on the premise of ensuring the best heat insulation effect, the shell 2 is provided with a vacuum pumping port device 8, an interlayer between the shell 2 and the sealed inner container 3 is vacuumized by using a vacuum unit, the heat transferred to the sealed inner container 3 through convection, conduction and radiation ways is reduced to the lowest possible degree along with the time passage, so that the normal work of a low-temperature system is maintained, the long-term storage is ensured, various valves, instruments and safety accessories of the tank car are intensively arranged in a rear-end control box 5 of the tank car, to facilitate management and operation.

Six wave-proof devices 9 are arranged in the middle of the sealed inner container 3, each wave-proof device 9 comprises a central tube 10 and a supporting plate 11, the central tube 10 is in a circular sleeve shape, the axis of the central tube coincides with the axis of the sealed inner container 3, the supporting plate 11 is in a horn shape, the opening of the small end of the supporting plate is welded with the outer surface of the central tube 10, the opening of the large end of the supporting plate is welded with the inner surface of the sealed inner container 3, the openings of the three large ends face to the left end of the sealed inner container 3, the openings of the other three large ends face to the right end of the sealed inner container 3, the horn-shaped supporting plate 11 can play a buffering role, so that the impact and the vibration of liquid in the tank body in all directions during the driving process of a vehicle are reduced, the safety is ensured, in order to further improve the wave-proof effect, the supporting plate 11, and the supporting plates 11 are arranged along the radial direction and press the edge grooves at 30 degrees of the circumference.

In order to maximize the volume of the sealed inner container 3, reduce the space of an interlayer between the outer shell 2 and the sealed inner container 3 and externally weld a channel steel ring 12 for improving the strength, rigidity and stability of the outer shell 2 on the outer surface of the outer shell 2, so that the volume of the sealed inner container 3 is increased, and higher transportation efficiency, lower cost per ton kilometer and larger one-way transportation and loading capacity are realized; meanwhile, the external steel ring 12 is welded on the outer surface of the outer shell 2, so that the roundness of the outer shell 2 can be effectively guaranteed, and the outer shell 2 and the sealed inner container 3 can be conveniently assembled.

Be equipped with on shell 2 and seal the communicating two sets of filling pipes of inner container 3, first filling pipe 13 leads to sealed inner container 3 bottom, be used for directly filling dress LNG to the tank wagon, second filling pipe 14 leads to sealed inner container 3 top and extends to the container left end, second filling pipe 14 that is located sealed inner container 3 top is equipped with a plurality of through-holes at the outer circumference lower surface of steel pipe uniformly, like this, when using second filling pipe 14, cold LNG sprays from sealed inner container 3 top, can bring back the BOG of sealed inner container 3 vapor space to the liquid phase, container pressure has been reduced, avoid the unnecessary jump of relief valve.

In order to improve the supporting strength of the shell 2 to the sealed inner container 3 and ensure that the sealed inner container 3 does not deform, two circles of angle steel 15 are symmetrically welded in the sealed inner container 3 at the position of 100mm of the supporting center line, a reinforcing plate 16 is welded on the outer surface of the inner container, a glass fiber reinforced plastic pillar 17 is used as a support, a through hole is formed in the shell 2 corresponding to the glass fiber reinforced plastic pillar 17, one end of the glass fiber reinforced plastic pillar 17 is in contact with the reinforcing plate 16, the other end of the glass fiber reinforced plastic pillar 17 penetrates through the through hole of the shell and is sealed through a plug 19, and the reinforcing plate 18 is welded on the outer surface of the shell, so that the glass fiber reinforced plastic pillar 17 is positioned between the reinforcing plate 16 and the plug 19 and plays a supporting role; the fiberglass support 17 with the fiberglass paper 20 packed inside has a low thermal conductivity, which can effectively ensure the reduction of heat transfer.

In order to ensure the durability of the vacuum degree, the top of the sealed inner container 3 is provided with a low-temperature adsorbent device, the low-temperature adsorbent is a mixture of 5A and 13X molecular sieves, the volume ratio of the two molecular sieves is 1:1, the adsorption capacity of the 5A molecular sieve is large, and the adsorption object is a molecule of normal hydrocarbon and the diameter of the molecule is less than 5 multiplied by 10 < -10 > m; the adsorption capacity of 13X is smaller than that of 5A, but the adsorption capacity can absorb oil vapor, the adsorption objects are various molecules with the diameter smaller than 10 multiplied by 10 < -10 > m, in addition, normal temperature hydrogen-absorbing agents 21 are respectively arranged on two sides of the inner wall of the shell 2, the normal temperature hydrogen-absorbing agents 21 are palladium oxide and are used for absorbing free hydrogen ions in the interlayer, the use of the low temperature adsorbent and the normal temperature hydrogen-absorbing agents 21 greatly improves the vacuum degree of the interlayer between the shell 2 and the sealed inner container 3, and therefore the heat insulation effect is improved.

Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.

Claims

LNG low temperature transportation tank wagon, including traction locomotive (1), sealed shell (2), set up sealed inner container (3), running gear (4) and valve instrument operation control box (5) in shell (2), its characterized in that: the appearance of shell (2) and sealed inner container (3) is the horizontal cylindrical jar body that the steel sheet system welding formed, and both ends are the butterfly head, the material of sealed inner container (3) is S30408 austenitic stainless steel, shell (2) material is Q345R carbon structural steel, the barrel surface welding of shell (2) has a plurality of groove steel rings (12), the welding has molecular sieve pipe (6) of filling the adsorbent on sealed inner container (3), sealed inner container (3) surface winding adiabatic cladding paper (7), adiabatic cladding paper (7) are formed by the interval winding of multilayer aluminium foil paper and glass fiber paper (20), and the number of winding is 40 layers, and the thickness of binding after tying is 20 ~ 22mm, the outer wall of sealed inner container (3) is hugged closely to glass fiber paper (20).
2. The LNG cryogenic transport tanker according to claim 1, characterized in that: the shell (2) is provided with a vacuum-pumping port device (8), and various valves, instruments and safety accessories of the tank car are intensively arranged in a rear-end operation box of the tank car.
3. The LNG cryogenic transport tanker according to claim 1, characterized in that: the sealed inner container (3) is made of austenitic stainless steel plates, a wave-proof device (9) is arranged in the sealed inner container, the wave-proof device (9) comprises a central tube (10) and a supporting plate (11), the axis of the central tube (10) coincides with the axis of the sealed inner container (3), the supporting plate (11) is in a horn shape, the opening of the small end of the supporting plate is welded with the outer surface of the central tube (10), the opening of the large end of the supporting plate is welded with the inner surface of the sealed inner container (3), two circles of angle steel (15) are symmetrically welded in the position of 100mm of the supporting central line in the sealed inner container (3), a reinforcing plate (16) is welded on the outer surface of the sealed inner container (3), a glass fiber reinforced plastic strut (17) is used as a support, a through hole is formed in a position, corresponding to the glass fiber reinforced plastic strut (17), on the outer shell (2), one end of the glass fiber reinforced plastic strut (17) is in contact with the reinforcing plate (16), the through hole, the other end of the surface of the outer shell (2) is sealed through a plug (19), and a reinforcing plate (18) is welded on the outer surface of the shell (2).
4. The LNG cryogenic transport tanker according to claim 1, characterized in that: tens of layers of high-heat-insulation aluminum foil paper are wound on the outer wall of the sealed inner container (3), glass fiber paper (20) is filled between the aluminum foil paper, and high-vacuum technical treatment is carried out between the interlayers.
5. The LNG cryogenic transport tanker according to claim 1, characterized in that: the LNG filling device is characterized in that a first filling pipe (13) and a second filling pipe (14) which are communicated with the sealed inner container (3) are arranged on the shell (2), the first filling pipe (13) is led to the bottom of the sealed inner container (3) and used for directly filling LNG into a tank car, the second filling pipe (14) is led to the top of the sealed inner container (3) and extends to the left end of the container, and a plurality of through holes are uniformly formed in the lower surface of the outer circumference of the steel pipe of the second filling pipe (14) positioned at the top of the sealed inner container (3).
6. The LNG cryogenic transport tanker according to claim 1, characterized in that: the top of the shell (2) is provided with a safe explosion-proof device, and the steel ring (12) is fixedly connected with the shell (2) in an external welding mode.
7. The LNG cryogenic transport tanker according to claim 1, characterized in that: the inner cavity of the sealed inner container (3) is provided with two molecular sieve low-temperature adsorption devices, and the two sides of the inner wall of the shell (2) are respectively provided with a normal-temperature hydrogen absorbing agent (21).
8. The LNG cryogenic transport tanker according to claim 1, characterized in that: and a composite support structure supported by radial combination is adopted between the sealed inner container (3) and the outer shell (2).
9. The LNG cryogenic transport tanker according to claim 1, characterized in that: the rear bottom of the sealed inner container (3) is welded with a strip-shaped support, the strip-shaped support is connected with a underframe car crossbeam by adopting a high-strength bolt, and a rubber gasket strip is added for damping.