CN101915356A - LNG storage tanks for diesel-LNG hybrid ships - Google Patents

Abstract

The invention discloses an LNG storage tank for a diesel-LNG hybrid ship, which comprises a sealed outer shell and a sealed inner container arranged in the outer shell. The outer shell is provided with a first LNG filling pipe communicating with the bottom of the inner container. The inner container is supported in the outer shell by a number of glass steel pipe pillars, and the inner container is wound with a heat insulation layer. The interlayer between the outer shell and the inner container is a vacuum, and the middle part of the inner container is equipped with a wave-proof device, which includes a central tube and The axis of the support plate coincides with the axis of the inner container. The support plate is trumpet-shaped. The opening at the small end is welded to the outer circumferential surface of the center tube, and the opening at the large end is welded to the inner wall of the inner container. Because the inner container is provided with a special structure anti-wave plate, the invention reduces the impact and vibration of the liquid in the tank in all directions during the running of the ship and ensures the safety. At the same time, the invention provides suitable liquid storage volume and good thermal insulation performance, and is completely suitable for use on ships.

Description

LNG storage tanks for diesel-LNG hybrid ships

technical field

The invention relates to a cryogenic container, in particular to an LNG storage tank for a diesel-LNG hybrid ship.

Background technique

The main component of LNG (Liquefied Natural Gas, liquefied natural gas) is composed of methane. It is obtained by cooling the gaseous natural gas at normal pressure to -162°C and condensing it into a liquid. It has the advantages of saving storage and transportation space and cost, large calorific value, and high performance. features.

LNG is a clean and efficient energy source. Many countries have listed LNG as the preferred fuel. The proportion of natural gas in energy supply has increased rapidly. LNG as a hybrid power has also begun to be gradually applied in the automotive field.

As the most economical means of transportation, ships generally use diesel fuel at present, but diesel-powered ships have high fuel consumption, high operating costs, and serious pollution. Therefore, diesel-LNG hybrid power has broad application prospects on ships. Since LNG needs to be kept at a temperature of about -162°C, low-temperature storage of LNG is the first key step to realize the application of diesel-LNG hybrid technology on ships.

There are generally two types of existing LNG cryogenic storage tanks, one is used in hybrid vehicles, but the storage tank is small in size (only about 60L-450L), which cannot meet the needs of ships. The other is the common LNG cryogenic liquid tank container, which is mainly used for LNG transportation and used as a fuel storage tank for ships. The volume is too large, which wastes the space on the ship, which is uneconomical, and the general working pressure is low, so it cannot be directly supplied to the ship’s internal combustion engine. air supply.

Contents of the invention

The technical problem to be solved by the present invention is to provide an LNG storage tank for a diesel-LNG hybrid ship, which provides a suitable liquid storage volume and good thermal insulation performance, so that the diesel-LNG hybrid power can be successfully applied on the ship.

In order to achieve the purpose of the above invention, the technical solution adopted by the present invention is to provide an LNG storage tank for a diesel-LNG hybrid ship, which includes a sealed outer shell and a sealed inner container arranged in the outer shell, and the outer shell is provided with the inner container. The first LNG filling pipe connected at the bottom, the inner container is supported in the outer shell by a number of glass steel pipe pillars and the inner container is wound with a heat insulation layer, the interlayer between the outer shell and the inner container is a vacuum, and the middle part of the inner container is equipped with a wave-proof device , the anti-wave device includes a central tube and a support plate, the axis of the central tube coincides with the axis of the inner container; the support plate is trumpet-shaped, and its small end opening is welded to the outer circumferential surface of the central tube, and the large end The opening is welded with the inner wall of the inner container.

In the above solution, the upper and lower parts of the large end of the support plate are respectively provided with upper and lower gaps formed by cutting the horizontal plane. The upper and lower gaps have the same shape and size, and the upper and lower gaps are welded with upper and lower right angle Bending plates, the horizontal parts of the upper and lower right-angle bending plates are adapted to the upper and lower notches respectively, the edges of the vertical parts are respectively adapted to the inner wall of the inner container, and the edges of the vertical parts of the upper and lower right-angle bending plates Weld with the inner wall of the inner container respectively.

In the above scheme, four reinforcing tubes are arranged in the inner container, and the four reinforcing tubes are arranged vertically and arranged symmetrically along the vertical mid-vertical plane of the inner container. Welding, a through hole is opened on the shell corresponding to the reinforcement pipe, the through hole is sealed by a plug, and the glass steel pipe pillars are respectively arranged between the plug and the reinforcement plate.

In the above scheme, the heat insulation layer is formed by winding multiple layers of aluminum foil paper and glass fiber paper at intervals, the number of winding layers is 50, the thickness after binding is 25-30mm, and the glass fiber paper is close to the outer wall of the inner container.

In the above scheme, a process manhole is provided on the upper left part of the inner container, and the through hole sealing cover is sealed, and a low temperature adsorbent is provided on the sealing cover.

In the above scheme, the low-temperature adsorbent is 5A, 13X molecular sieve or a mixture of 5A and 13X, and the mass ratio of the two in the mixture of 5A and 13X is 2:1.

In the above solution, the left and right sides of the inner wall of the casing are respectively provided with hydrogen absorbing agents, and the hydrogen absorbing agents are metal palladium or zirconium.

In the above solution, a supercharger is provided on the shell, and the outlet of the supercharger communicates with the inner chamber of the inner container.

In the above scheme, a second LNG filling pipe is also provided on the top of the shell, and the second LNG filling pipe leads into the inner cavity of the inner container and extends along the top wall of the inner container to its left end, and is located at the second LNG filling pipe on the top of the inner container. A plurality of through holes are evenly formed on the outer peripheral surface of the LNG filling pipe part.

According to the present invention, LNG storage tanks are tailored according to the specific conditions of inland ships, and the effective volume reaches 5m3-10m3. The impact and vibration of the liquid in the tank in all directions during the running of the ship ensures the safety.

Description of drawings

Fig. 1 is a schematic structural view of an embodiment of an LNG storage tank used in a diesel-LNG hybrid ship of the present invention; Fig. 2 is an enlarged view of part A in Fig. 1; Fig. 3 is an enlarged view of part B in Fig. 1; Fig. 4 is a schematic cross-sectional structure diagram of the anti-wave device; Fig. 5 is a side view of the anti-wave device; Fig. 6 is a top view of the anti-wave device; Fig. 7 is a schematic diagram of the three-dimensional structure of the upper and lower right-angle bent plates; The top view of the LNG storage tank; Fig. 9 is the right view of the LNG storage tank used for diesel-LNG hybrid ships.

Detailed ways

The invention will be described in detail below in conjunction with the accompanying drawings.

The invention provides an LNG storage tank for a diesel-LNG hybrid ship, which is used for long-term storage of low-temperature LNG under a pressure range of 0-0.8Mpa to provide fuel for ship engines. Fig. 1 is a structural schematic diagram of an embodiment of an LNG storage tank for a diesel-LNG hybrid ship, and Fig. 2 is an enlarged view of part A in Fig. 1, as shown in Fig. 1 and Fig. 2, for diesel-LNG hybrid The LNG storage tank of a power ship includes a sealed outer shell 1 and a sealed inner container 2 arranged in the outer shell 1. The outer shell 1 and the inner container 2 are horizontal cylindrical tanks welded by steel plates, and the two ends are spherical , the material of the inner container 2 is 06Cr19Ni10 low-carbon austenitic stainless steel, the material of the outer shell 1 is Q345R carbon structural steel, and several circles of angle steel 3 are welded on the outer cylindrical inner surface of the outer shell 1 to strengthen the rigidity and strength of the outer shell 1 , the inner container 2 is wound with a heat insulation layer 4, the heat insulation layer 4 is formed by winding multiple layers of aluminum foil paper and glass fiber paper at intervals, the number of winding layers is 50 layers, and the thickness after bundling is 25-30mm, in which the glass fiber paper is tight The selection of the outer wall of the inner container 2, the number of winding layers and the thickness has been tested to ensure the best heat insulation effect and the most economical materials. The outer casing 1 is equipped with a vacuum interface device, and the interlayer between the outer casing 1 and the inner container 2 is evacuated by a vacuum unit, so as to make every effort to transfer the air to the inner container 2 through convection, conduction and radiation over time. The heat conduction is reduced to the lowest possible level to maintain the normal operation of the low-temperature system and ensure long-term storage of low-temperature LNG. Various pipelines and valves are installed on the shell 1, and the low-temperature LNG liquid is delivered through the switch of the valves for use by the engine. The main nozzle valves and instruments (pressure gauges, liquid gauges, etc.) are arranged on the front of the head of one side of the storage tank. And when installed on the ship, facing the starboard side of the hull, the pipelines and valves are arranged neatly, which makes the operation and maintenance convenient. The storage tank is equipped with a saddle 6 with mounting holes (one end is a round hole and the other end is a long hole) so that it can be accurately installed on the hull deck.

The middle part of inner container 2 is provided with anti-wave device 5, and the structure of anti-wave device is shown in Fig. 4, Fig. 5 and Fig. 6, comprises center tube 51 and support plate 52, and center tube 51 is circular sleeve shape, and its axis and content The axis of container 2 coincides, and support plate 52 is trumpet-shaped, and its small end opening is welded with the outer circumferential surface of central tube 51, and the large end opening is towards the left end of inner container, because be horn-shaped support plate 52 can play buffering effect, Therefore, the impact and vibration of the liquid in the tank to various directions during the running of the ship is reduced, and the safety is ensured. In order to further improve the anti-wave effect, the support plate 52 in the present invention adopts a more advanced structure. The upper and lower parts of the large end of the support plate 52 are respectively provided with upper and lower gaps formed by cutting the horizontal plane. The notches have the same shape and size, and the upper and lower notches are respectively welded with upper and lower right-angled bent plates 53. The structure of the upper and lower right-angled bent plates 53 is shown in Figure 7, and the horizontal parts 531 of the upper and lower right-angled bent plates are respectively connected to The upper and lower gaps are adapted, the edges of the vertical part 532 are respectively adapted to the inner wall of the inner container, and the edges of the upper and lower right-angle bent plate vertical parts 532 are respectively welded with the inner wall of the inner container. The setting of the upper and lower right-angle bent plates 53 reduces the shaking of the liquid in the upper and lower parts in the inner space of the support plate 52. After testing, the anti-fluctuation effect has been improved by 20%.

The outer casing 1 is provided with a first LNG filling pipe 14 communicating with the bottom of the inner container 2, which is used to fill the LNG storage tank with LNG. In addition, the storage tank provided by the present invention is also provided with a second LNG filling pipe 15. Two LNG filling pipes 15 extend into the inner cavity of the inner container 2 and extend to its left end along the top wall of the inner container 2, and the outer circumferential surface of the second LNG filling pipe part at the top of the inner container 2 is evenly provided with Multiple vias. In this way, the LNG can be directly imported into the storage tank without discharging, because the LNG imported from the second LNG filling pipe 15 can be evenly sprayed onto the slightly hot gas in the storage tank, reducing the pressure of the container. Therefore, the first filling The filling pipe 14 can quickly input the LNG into the storage tank to maintain a low and stable pressure. The first LNG filling pipe 14 and the second LNG filling pipe 15 can be set to two respectively, on the one hand, they can be filled quickly at the same time, and on the other hand, the room for selection can be increased, for example, when one of the filling pipes is repaired , you can use another filling pipe for filling, avoiding the influence of LNG filling when the pipeline fails, and improving reliability and work efficiency.

In order to improve the support strength of the outer shell 1 to the inner container 2 and ensure that the inner container 2 is not deformed, four reinforcing tubes 21 are provided inside the inner container 2. In combination with Figures 1, 3, 6 and 8, the four reinforcing tubes 21 are arranged vertically and arranged symmetrically along the vertical plane of the inner container 2. The end of the reinforcing tube 21 is welded to the outer wall of the inner container 2 through the reinforcing plate 22. The part of the shell 1 corresponding to the reinforcing tube 21 A through hole is opened, and the through hole is sealed by the plug 11. The glass steel pipe pillars 7 are respectively arranged between the plug 11 and the reinforcement plate 22 to play a supporting role. The glass steel pipe pillar 7 is used as a support to enhance the effect of heat insulation. At the same time, since the fiberglass steel pipe support 7 is carried by four reinforcing pipes 21, it is ensured that the inner container 2 is not easily deformed.

The upper left part of the inner container 2 is provided with a process manhole 23, which is used to manually clean the inside of the inner container. The process manhole 23 is covered with a sealing cover 24 to realize sealing. In order to further improve the heat insulation effect, the sealing cover 24 is provided with The low-temperature adsorbent 25, the low-temperature adsorbent is 5A or 13X molecular sieve, the best solution is to use 5A or 13X in combination, and the mass ratio of the two in the mixture of 5A and 13X is 2:1. In addition, the left and right sides of the inner wall of the shell 1 are respectively provided with hydrogen absorbing agents 12 for absorbing free hydrogen ions in the interlayer. The hydrogen absorbing agents are metal palladium or zirconium, which have extremely strong hydrogen absorbing properties. As a result, the use of the low-temperature adsorbent and the hydrogen absorbing agent can greatly increase the vacuum degree in the interlayer between the outer shell 1 and the inner container 2, thereby improving the effect of heat insulation.

In the invention, a supercharger 13 is provided on the casing 1. As shown in FIG. 9, the outlet of the supercharger 13 communicates with the inner cavity of the inner container 2. During a large amount of discharge operation, the supercharger can be used to increase the pressure. To maintain a high air supply for the engine.

In the present invention, the effective volume of the LNG storage tank reaches 5m ³ ~ 10m ³ , and the working pressure is generally set at 0.8MPa and 1.2MPa, which can meet the requirements for LNG fuel storage of inland waterships and provide for the development of inland waterway shipping in the direction of economy and low-carbon environmental protection. conditions. In detail, the present invention has the following beneficial effects.

(1) The anti-wave plate is installed inside the storage tank, which reduces the impact and vibration of the liquid in the tank in all directions during the ship's driving, ensuring safety.

(2) For the storage tank body and pipeline, all the pressure relief gas is discharged through the centralized vent, which improves the safety and reliability of the system. Depending on the state of the ship, the height at which the vent nozzle is erected can be changed. The vent pipe adopts a lightweight design, and the connection adopts a quick connector, which is quick and easy to replace and use.

(3) The filling ports of storage tanks are all located on the starboard side of the ship, which is convenient for the promotion of marine LNG power systems and forms a unified filling specification.

(4) The external dimension parameters of the storage tank are designed in accordance with the requirements of inland waterway marine equipment. After the storage tank is installed on the deck of the ship, it will not affect the activities of the crew, any on-board operations and the normal navigation of the ship.

(5) There are LNG filling pipes on the top and bottom of the inner container, and the LNG filling pipes on the top can play a role in cooling down, therefore, quick filling of LNG can be realized.

The present invention is not limited to the above preferred mode of implementation, and anyone should know that any structural changes made under the inspiration of the invention, and any technical solutions that are the same as or similar to the invention, all fall within the scope of protection of the invention.

Claims (9)

1. The LNG storage tank used for diesel-LNG hybrid ships, including a sealed outer shell and a sealed inner container arranged in the outer shell, the outer shell is provided with a first LNG filling pipe connected to the bottom of the inner container, and the inner container passes through several The glass steel pipe pillars are supported in the outer shell and the inner container is wrapped with a heat insulation layer. The interlayer between the outer shell and the inner container is a vacuum. It is characterized in that an anti-wave device is installed in the middle of the inner container in the axial direction. The anti-wave device includes: a central tube whose axis coincides with that of the inner vessel; The support plate is trumpet-shaped, the opening at the small end is welded with the outer peripheral surface of the central tube, and the opening at the large end is welded with the inner wall of the inner container. 2. The LNG storage tank for diesel-LNG hybrid ships as claimed in claim 1, characterized in that the upper and lower parts of the large end of the support plate are respectively provided with upper and lower gaps formed by horizontal plane cutting, the The shape and size of the upper and lower notches are the same, and upper and lower right-angle bent plates are respectively welded at the upper and lower notches. respectively adapted to the inner wall of the inner container, and the edges of the vertical parts of the upper and lower right-angle bent plates are respectively welded to the inner wall of the inner container. 3. The LNG storage tank for a diesel-LNG hybrid ship as claimed in claim 1, wherein four reinforcing pipes are arranged in the inner container, and the four reinforcing pipes are vertically arranged respectively along the axis of the inner container. Arranged symmetrically toward the vertical mid-vertical plane, the end of the reinforcement tube is welded to the inner container through a reinforcement plate, and a through hole is opened on the outer shell corresponding to the reinforcement tube, the through hole is sealed by a plug, and the glass steel pipe pillar is set Between the plug and the reinforcing plate. 4. The LNG storage tank for diesel-LNG hybrid ships as claimed in claim 1, wherein the heat insulation layer is formed by winding multiple layers of aluminum foil paper and glass fiber paper at intervals, and the number of winding layers is 50 layers , the thickness after bundling is 25-30mm, and the glass fiber paper clings to the outer wall of the inner container. 5. The LNG storage tank for diesel-LNG hybrid ships as claimed in claim 1, characterized in that the upper left part of the inner container is provided with a process manhole, and the through-hole sealing cover is sealed, and the sealing cover is provided with a low-temperature adsorption agent. 6. The LNG storage tank for diesel-LNG hybrid ships as claimed in claim 5, characterized in that said low temperature adsorbent is a mixture of 5A, 13X molecular sieve or 5A and 13X, the mixture of both in 5A and 13X The mass ratio is 2:1. 7. The LNG storage tank for diesel-LNG hybrid ships as claimed in claim 1, characterized in that the left and right sides of the inner wall of the shell are respectively provided with a hydrogen absorbing agent, and the hydrogen absorbing agent is metal palladium or zirconium . 8. The LNG storage tank for a diesel-LNG hybrid ship according to claim 1, characterized in that a supercharger is provided on the outer shell, and the outlet of the supercharger communicates with the inner cavity of the inner container. 9. The LNG storage tank for a diesel-LNG hybrid ship as claimed in claim 1, wherein the top of the shell is also provided with a second LNG filling pipe, and the second LNG filling pipe leads into the inner container In the cavity and extending along the top wall of the inner container to its left end, a plurality of through holes are uniformly arranged on the outer peripheral surface of the second LNG filling pipe part at the top of the inner container.

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