WO2016206581A1

WO2016206581A1 - Safe and efficient cng transport ship gas cargo system

Info

Publication number: WO2016206581A1
Application number: PCT/CN2016/086600
Authority: WO
Inventors: 王会赏; 王五开; 李书磊; 刘玉红; 韩晓燕; 张志辉; 侯雄伟; 白华琴; 张占武; 张洪
Original assignee: 石家庄安瑞科气体机械有限公司
Priority date: 2015-06-23
Filing date: 2016-06-21
Publication date: 2016-12-29
Also published as: CN105270569B; CN105270569A

Abstract

A CNG transport ship gas cargo system, comprising a ship body (1), a gas storage unit limited inside the ship body (1), a supporting pipeline system, and a corresponding control unit and servo mechanism. The gas storage unit comprises a group of gas cylinders (2) provided in a sealed hold (5) and arranged vertically along the ship body. An upper end of the gas cylinder (2) extends outside of the sealed hold via an upper end plug assembly. The supporting pipeline system is provided above the sealed hold (5) via the upper end plug assembly and a controlled pneumatic valve, and realizes connection and disconnection with the gas cylinders. The control unit, and an additional manual control member and a random detection display of the control unit are provided above the sealed hold (5) at both sides of a circulation channel. The gas cargo system separately provides gas cylinders, pipelines and a control system, and the cylinders are provided within a sealed ship hold while the pipelines and control system are provided above the hold cover, thereby increasing the safety of transporting CNG by ship.

Description

CNG safe and efficient transport ship gas cargo system

Technical field

The invention belongs to a compressed gas marine transportation system, and relates to a CNG transportation ship, in particular to a CNG safe and efficient transportation ship gas cargo system.

Background technique

A compressed natural gas (CNG) transport vessel is a cargo ship that transports compressed natural gas. It is increasingly favored because it does not require expensive facilities such as liquefaction plants and regasification terminals, which is conducive to reducing shipping costs. US Patent No. 4,846,088 discloses a method of transporting compressed natural gas having a storage vessel above a deck or deck of a marine barge, including a plurality of pressures formed by ducted pipes horizontally placed on the deck of the barge. bottle. The disadvantage of this method of transport is that the number of pressure bottles is limited because these pressure bottles are placed above the deck. In order to maintain the stability of the barge, the amount of gas that can be loaded by a single barge is greatly limited, resulting in the price of the unit loading gas. Raise.

US Patent Application No. 96291260.X, which is filed in the United States, discloses a compressed natural gas shipping system in which a compressed gas storage container is provided, each of which includes 3 to 30 compressed gas storage containers. Cylinders, cylinders are installed in the cabin in a vertical direction, and the cabin is covered with hatch covers to prevent entry into the sea. The system does not disclose the fixing method of the gas cylinder. It is well known that the sea transportation is different from the land. Due to the influence of the waves and the bad weather, the transportation ship often bumps up and down and swings left and right during the driving process. Therefore, the fixing of the gas cylinder is safe. The primary problem of transportation is solved; and in the above system, all the cylinders are covered with hatch covers. In the event of a leakage of compressed natural gas, the consequences are unimaginable. How to discharge the leaked natural gas to the cargo compartment on the CNG carrier is also an urgent solution. The technical problem is disclosed in the patent application No. 201420667174.9. The compressed natural gas carrier has a gas permeable mast disposed on the cargo tank cover, the gas permeable mast comprising a hollow tubular structure and a vent line disposed on the shaft through the vent line Natural gas leaking from the cylinder mouth is discharged to the outside of the cargo hold; however, this structure increases the complexity of the piping setup.

The patent application No. 200680023284.X discloses a compressed natural gas transport vessel in which the upper tanks are arranged in a closed space except for the upper ends, and the upper ends of the tanks are provided with a side wall, and an extension sleeve is arranged on the deck. The tank is suspended directly on the extension joint by means of the side wall, and all the matching pipelines are arranged outside the cabin. Although the structure reduces the risk of natural gas leakage, the structural safety of the tank directly suspended in the extension sleeve by the side wall is poor.

Summary of the invention

The technical problem to be solved by the present invention is to provide a CNG safe and efficient transport ship gas cargo system, which can limit the bottom and middle portions of the gas storage unit and the hull and the top end to expand freely, thereby reducing the impact of the hull bump and the sway on the gas storage unit. The force and the isolation of the gas storage unit and the pipeline improve the safety factor of the CNG carrier and are suitable for the harsh marine environment.

In order to solve the above technical problems, the technical solution adopted by the present invention is:

The utility model relates to a CNG safe and efficient transport ship gas cargo system, which comprises a hull, a gas storage unit limited to the hull body, a supporting pipeline system, and a corresponding control unit and a servo mechanism, wherein the gas storage unit is arranged in the closed cabin, a gas cylinder group arranged vertically along the hull, the upper end of the gas cylinder extending out of the airtight compartment by means of the upper end plug assembly, the supporting pipeline system being arranged above the airtight compartment by means of the upper end plug assembly and the controlled pneumatic valve The bottle is connected to the open and close, and the control unit and its associated manual control unit and random detection display unit are disposed on both sides of the tour channel above the airtight compartment.

The lower end of the gas cylinder is restrained by the swing damper mechanism and the bottom of the hull, the central portion is restrained by the keel on the hull by the strap assembly, and the upper end is flexibly restricted by the upper end plug assembly and the hatch of the closed compartment.

Preferably, the swing damping mechanism comprises a flange threadedly connected to a lower bottle opening of the gas cylinder, a flange having a spherical boss, and a flange bracket welded to the cylinder base and carrying the spherical boss; The flange is restrained on the base of the cylinder by a pre-tightening bolt with a cushioning shock absorbing component, and forms a swing limit structure with the flange bracket.

The keel is connected between the two sides of the ship, and the positioning plate of the limiting cylinder is arranged on the keel. The strap assembly comprises a strap around the cylinder, and a stud nut disposed on the keel and positioned at both ends of the strap. The cylinder is formed with a limiting structure between the positioning plate and the strap; the height of the strap is not lower than the height of the center of gravity of the cylinder.

The hull is divided into 3 to 6 closed compartments by means of a partition, the cylinders are arranged in the axial direction of the hull in the closed compartment, and the loading and unloading gas branching pipes communicating with the upper plug assembly are collected in the middle of the two cylinders. The unit air inlet pipe, each unit air pipe is collected to the loading and unloading gas main pipe through the first half main pipe or the rear half main pipe, and the two ends of the loading and unloading gas main pipe extend to both sides of the hull, respectively, by means of loading and unloading air seat bending pipe and loading and unloading air seat Connected.

In the above technical solution, the bottom of the cylinder is limited by the swing damping mechanism to reduce the impact force on the cylinder when the hull is bumped and swayed. In a further improved preferred scheme, the convex spherical surface of the spherical flange is used. The swing limit structure is formed between the flange ring and the buffer damper mechanism, so that when the hull swings side to side or bumps up and down, the cylinder bottle integrally connected with the flange can be buffered during the swinging of the hull. The follow-up adjustment absorbs the upward or downward stress applied from the hull to the cylinder, which is equivalent to forming an oscillating bearing, which reduces the impact stress applied to the bottle or the cylinder support due to inertia. The safety of the gas cylinder is positioned to accommodate the bumps and sway of the hull; the strap is fixed in the middle, the upper hatch is free to expand, and the hatch hole is sealed, and the friction between the middle strap and the bottle can also be limited. The rotational force applied to the cylinder by the hull.

The beneficial effects produced by the above technical solution are as follows: (1) The bottom swinging limit of the gas cylinder in the present invention, the middle limit by the strap, and the two-point limit structure enables the bottle body to adapt according to the bump and sway of the hull. The swing adjustment reduces the impact of the hull on the bottle body and the cylinder support, and improves the safety of the cylinder positioning during the driving of the CNG ship; (2) the top seal can form a closed cabin environment on the one hand, keeping the cabin safe. Environment, on the other hand, prevent Solve the erosion of the bottle body caused by the harsh sea environment; (3) erect the supporting pipeline system above the airtight compartment by means of the upper end plug assembly, realize the isolation of the gas cylinder and the pipeline, and improve the safety of the CNG carrier; The straight-displaced bottle body improves the luck of the single ship, and the supporting pipeline adopts the method of grading and concentrating the gas cylinder, which can efficiently load and unload the gas; (4) The positioning method of the invention has the advantages of simple structure, simple operation of loading and unloading gas, control system and The supporting pipelines are all arranged above the airtight compartment, and are convenient for pipeline maintenance, overhaul, and cylinder pressure monitoring and emergency treatment. The set keel increases the stability of the hull.

DRAWINGS

Figure 1 is a front view showing the structure of a CNG ship of the present invention;

Figure 2 is a top plan view of Figure 1;

Figure 3 is a schematic left side view of Figure 2;

Figure 4 is an enlarged schematic view of the limit structure of the bottom of the gas cylinder of Figure 3

Figure 5 is an enlarged plan view showing the position limit structure of the middle portion of the gas cylinder of Figure 3;

Figure 6 is a schematic structural view of the upper end plug assembly;

Figure 7 is a schematic view showing the structure of the upper part of the cylinder and the supporting pipeline along the axial direction of the ship;

Figure 8 is a schematic view showing the structure of the upper part of the cylinder, the loading and unloading gas line and the sewage line in the radial direction of the ship;

Figure 9 is a schematic enlarged view of the structure of Figure 2;

Figure 10 is a front view showing the structure of the safety discharge pipe;

Among them, 1 represents the hull, 2, cylinder, 2-1, lower bottle mouth, 2-2, upper bottle mouth, 2-3, outlet tube, 2-4, ring convex, 2-5, valve seat, 2 -6, end plug, 2-7, sewage outlet, 2-8, inlet and outlet air hole, 3, cylinder base, 4, keel, 5, closed compartment, 5-1, hatch, 5-1-1, Boss, the following B1 ~ B7 means the bottom limit of the cylinder, B1, pre-tightening bolt, B2, flange, B3, rubber spring, B4, sealing washer, B5, butterfly spring, B6, cap type sealing sleeve , B7, flange ring, the following M1 ~ M5 represents the middle part of the cylinder positioning, M1, strap, M2, positioning plate, M3, stud nut pair, M4, rubber cushion, M5, connecting ribs, T1 Organ pipe type sealing sleeve; 6-1, loading and unloading gas main pipe, 6-2, loading and unloading air seat, 6-3, loading and unloading air seat elbow, 6-4, unit snorkel, 6-5, front half main pipe, 6- 6, the second half of the main pipe, 6-7, loading and unloading gas branch pipe, 7-1, unit sewage pipe, 7-2, sewage branch pipe, 9-1, vertical discharge pipe, 9-2, longitudinal discharge pipe, 9-3, Vertical discharge 桅, 9-4, lateral discharge pipe, 9-5, emergency discharge valve, 9-6, safety discharge valve.

detailed description

Referring to Fig. 1, the CNG safe and efficient transport ship cargo system of the present embodiment includes a hull 1, a gas storage unit limited to the hull 1, a supporting pipeline system, and a corresponding control unit and servo mechanism, in the closed compartment 5. a group of gas cylinders arranged vertically along the hull, the upper end of the cylinder 2 extending out of the airtight compartment 5 by means of the upper end plug assembly, the supporting piping system being arranged in the closed compartment by means of the upper end plug assembly and the controlled pneumatic valve 5 above, with the gas cylinder to open and close, the control unit And its associated hand control components and random detection display components are disposed on both sides of the cruise channel above the airtight compartment 5.

The hatch cover 5-1 of the airtight compartment 5 of the hull 1 can be walked on or mounted with other components. The invention sets the supporting pipeline system above the hatch 5-1; the cylinder 2 is arranged from the bottom of the hull, which reduces the height of the center of gravity of the CNG vessel, and is beneficial to the safe and smooth operation of the CNG carrier. The cylinders of the gas cylinders are all enclosed in the closed compartment 5, and sealed. The gas cylinders are separated from the pipelines to prevent natural gas from leaking from the pipelines or pipeline joints into the closed compartments, causing accidents and improving the safety of CNG vessels. Sex.

The invention limits the cylinder from the bottom and the middle, and the top passes through the hatch 5-1 through the upper end plug assembly, the cylinder can expand freely; and all the inlet and outlet pipelines are divided into systems, sewage pipelines, and safely discharged. The pipeline system such as the pipeline sub-system and the N ₂ purge pipeline sub-system are arranged outside the airtight compartment 5, which facilitates the maintenance of the pipeline on the one hand and avoids the explosion of natural gas leakage in the cabin on the other hand. Among them, the safety of gas cylinders is one of the most important aspects of safe transportation. The lower end of the gas cylinder 2 is restrained by the swing damper mechanism and the bottom of the hull 1, the middle portion is damped by the keel 4 on the hull 1 by the strap assembly, and the upper end is closed by the upper end plug assembly and the hatch 5 of the closed compartment 5. -1 flexible limit.

Wherein, the swing damping mechanism comprises a threaded fit of the lower bottle opening 2-1 of the gas cylinder 2, a flange B2 having a spherical boss, and a flange bracket welded to the cylinder base 3 and carrying the spherical boss The flange B7 is restrained on the cylinder base 3 by a pre-tightening bolt B1 provided with a cushioning shock absorbing assembly, and forms a swing limiting structure with the flange bracket B7. The cylinder base 3 is welded to the bottom of the hull 1 to help reduce the center of gravity of the cylinder. The flange ring B7 may be a tapered hole seat or a spherical hole seat matched with a spherical boss.

The structure of the cushioning shock absorbing assembly includes a rubber spring B3 and a butterfly spring B5 which are respectively disposed on the pre-tightening bolt B1 and are respectively disposed at upper and lower end faces of the cylinder base 3. The rubber spring B3 and the butterfly spring B5 have a buffering and shock absorbing effect on the bottle body. As shown in FIG. 4, the pre-tightening bolt B1 positions the flange B2 on the cylinder base 3 with a certain pre-tightening force, and a rubber spring B3 is arranged between the flange B2 and the upper end surface of the cylinder base 3, in the pre-tightening. A butterfly spring B5 is disposed between the lower end of the force bolt B1, the lower end surface of the cylinder base 3, and the nut of the pre-tightening bolt B1. When installing, first, according to the mechanical parameters and dimensions of the rubber spring B3 and the butterfly spring B5 and the pre-tightening force, the position of the nut on the bolt is designed. When the bolt assembly is installed, the butterfly spring B5 and the rubber spring B3 are kept at a certain degree of compression, and in the case where the cylinder 2 is subjected to vertical acceleration, the compressed rubber spring B3 and the stretched butterfly spring B5 are common. The buffer absorbs the external load impact force received by the cylinder 2; when the external load impact force disappears, the cylinder 2 is reset to the initial position by the tensioned butterfly spring B5. The setting of the shock absorbing mechanism can effectively prevent the cylinder 2 from being subjected to the vertical acceleration, and the inner wall is deformed and damaged, thereby effectively reducing the probability of the cylinder 2 leaking. When the hull 1 swings to the left and right, the shock absorbing mechanism on one side is compressed, and the damper mechanism on the other side is stretched, so that the gas cylinder 2 is freely oscillated in the flange ring B7 by the flange B2 to relieve the hull 1 Swinging the impact on the cylinder 2 from side to side, reducing the probability of deformation or damage of the cylinder 2, which is important for ensuring safe transportation. One of the measures.

The lubricating oil is filled between the flange B2 and the flange ring B7 and sealed by the sealing ring; the lubricating oil increases the lubrication between the flange B2 and the flange ring B7, and has the function of preventing corrosion. A sealing gasket B4 is further disposed between the lower end surface of the cylinder base 3 and the butterfly spring B5, and a cap-shaped sealing sleeve B6 covering the outside of the butterfly spring B5 is fitted on the sealing gasket B4. The sealed cap seal B6 prevents rusting of the butterfly spring B5 and improves the cylinder safety system.

Referring to FIG. 5, the keel 4 is connected between two ships, and the keel 4 is provided with a positioning plate M2 of the limiting cylinder 2, and the strap assembly includes a strap M1 surrounding the cylinder 2. And a stud nut pair M3 disposed on the keel 4 and the two ends of the strap M1, the cylinder 2 forms a limit structure between the positioning plate M2 and the strap M1; the setting height of the strap M1 is not low The height of the center of gravity of the cylinder 2. In this embodiment, the cylinder 2 and the hull 1 are floated and positioned by using the bottom and middle limits, which can not only move synchronously with the hull 1, but also relieve the impact of the hull 1 bump and sway on the cylinder, and realize the cylinder 2 A combination of effective limits and random swings. The height of the strap M1 is not lower than the height of the center of gravity of the cylinder 2 to ensure the stability of the cylinder 2, and the design height of the strap M1 is preferably 0.6 to 0.7 times the height of the bottle.

A connecting rib M5 perpendicular to the keel 4 is disposed between the two adjacent keels 4, and the two ends of the positioning yoke are respectively positioned with the keel 4 and the connecting rib M5, and the middle portion is disposed corresponding to the outer wall of the gas cylinder 2 Connection. On the one hand, the abutment portion forms a support for the cylinder 2 cylinder, and on the other hand, the positioning plate M2 also has a certain buffering effect on the cylinder. Positioning the backing plate M2 makes the positioning of the strap more convenient.

A rubber cushion M4 is disposed between the positioning plate M2 and the gas cylinder 2 and between the strap M1 and the gas cylinder 2, on the one hand, the friction between the strap M1 and the gas cylinder 2 is increased, and on the other hand, the gas cylinder 2 is The hull 1 forms a buffer between the hulls 1 and has a protective effect on the gas cylinder 2.

The upper end plug assembly is shown in Fig. 6. The structure includes an end plug 2-6 which is matched with the upper bottle opening 2-2 of the gas cylinder 2, and has an inlet and outlet air passage 2-8 and a sewage outlet 2-7. a discharge tube 2-3 connected to the end plug 2-6, and a valve seat 2-5 disposed on the discharge tube 2-3, the middle of the discharge tube 2-3 passing through the hatch 5-1, and It is sealed with the hatch 5-1 by means of the organ tube gland T1. The outlet tube 2-3 adopts a double-armed tube structure, and the outer tube and the inner tube cavity formed are respectively connected with the inlet and outlet air through holes 2-8 and the sewage outlet 2-7, and the valve seat 2-5 An inlet and outlet valve and a drain valve respectively connected to the inlet and outlet gas passage holes 2-8 and the sewage outlet 2-7 are provided.

The upper part of the gas cylinder 2 is pierced out of the hatch 5-1 by means of the outlet tube 2-3, and the upper end of the cylinder 2 is free, so that the cylinder 2 can be freely expanded or contracted, and the binding of the two ends to the cylinder 2 can be reduced. There are various sealing structures between the outlet tube 2-3 and the hatch cover. The sealing structure of the present embodiment is shown in FIG. 7 and FIG. 8: the hatch cover 5-1 is disposed corresponding to the outlet tube 2-3. And the outlet hole is larger than the exit hole 2-3, and the boss 5-1-1 is arranged around the exit hole; the outlet tube 2-3 which is taken out of the hatch 5-1 is set Annular convex 2-4, the organ tubular sealing sleeve T1 is set between the annular convex 2-4 and the boss 5-1-1 to form a flexible limit and sealing structure. The organ pipe seal sleeve T1 can be designed in a multi-stage structure, and different levels of the organ tube seal sleeve T1 can be used according to the curvature of the cabin top.

The hull 1 is divided into 3 to 6 closed compartments 5 by means of a partition plate. The gas cylinders 2 are arranged in the axial direction of the hull in the closed compartment 5, and the loading and unloading gas branch pipes 6-7 communicating with the upper end plug assembly are collected. The unit manifold 6-4 in the middle of the two cylinders, each unit manifold 6-4 is collected to the loading and unloading gas main pipe 6-1 via the front half main pipe 6-5 or the rear half main pipe 6-6, respectively, the loading and unloading gas main pipe Both ends of 6-1 extend to both sides of the hull 1, and are respectively connected to the loading and unloading seat 6-2 by means of the loading and unloading air tube 6-3. The loading and unloading gas pipeline sub-system further includes control valves respectively disposed on the unit air outlet pipe 6-4, the front half zone main pipe 6-5, the rear half zone main pipe 6-6, and the loading and unloading gas main pipe 6-1, wherein the control system is The corresponding output ends are respectively connected to the control ends of the respective control valves.

Each unit of the gas pipe is provided with a pressure guiding pipe connected to the pressure gauge, and the output end of the pressure gauge is connected to a corresponding input end of the control unit. The control of each pipeline is achieved by a pressure signal.

The unit manifold 6-4 is closed at one end, and the unit main valve-pneumatic ball valve is installed at the end near the diaphragm bulkhead. The control mode is inflation opening, pressure relief closing; manual/automatic conversion between the valve and the pneumatic actuator The device can be manually operated on the valve; the valve position detecting switch is provided, and the opening and closing state of the valve can be determined by an electric signal. The first half of each unit is combined to form the front half of the main pipe 6-5, along the right side of the top of the tank to the middle, the front half of the main valve - pneumatic ball valve, then connected to the loading and unloading gas main 6-1, the latter half of the unit summary Form the rear half of the main pipe 6-6, along the left side of the top of the tank to the middle, install the rear half of the total valve - pneumatic ball valve, and then access the loading and unloading gas main pipe 6-1, both valves are equipped with valve position detection switch, can The opening and closing state of the valve is determined by an electrical signal.

A safety discharge valve 9-6 is provided on each of the unit air intake pipe 6-4, the loading and unloading gas main pipe 6-1, and the loading and unloading air pipe bending pipe 6-3.

The safety discharge valve 9-6 is in communication with a safety discharge line sub-system comprising a vertical discharge pipe 9-1 communicating with the safety discharge valve 9-6, and being disposed in the vertical discharge pipe 9-1 The lateral discharge pipe 9-4 above and collecting the vertical discharge pipe 9-1, the longitudinal discharge pipe 9-2 collecting the lateral discharge pipe 9-4, and the vertical discharge port 9-3 communicating with the longitudinal discharge pipe 9-2 . The emergency venting valve 9-5 is also connected to each of the unit snorkels 6-4, and the emergency venting valve 9-5 and the safety venting valve 9-6 are respectively inclined by the downwardly inclined pipeline and the vertical The discharge pipe 9-1 is connected; the bottom end of the vertical discharge pipe 9-1 and the vertical discharge port 9-3 are respectively provided with a drain ball valve. The downwardly inclined pipeline can be used to discharge corrosive liquid into the vertical discharge pipe 9-1 and discharged through the discharge ball valve 9-1-1 at the lower end of the vertical discharge pipe 9-1 to reduce corrosion of the pipeline and maintain The pipeline is clean.

The safety discharge line communicates with the loading and unloading gas line system via at least one safety discharge valve 9-6 and at least one emergency discharge valve 9-5 to form an overpressure discharge mechanism and an emergency discharge mechanism of the loading and unloading gas line; The respective output ends are connected to the safety discharge valve 9-6 and the control end of the emergency discharge valve 9-5, which is also provided with a manual valve.

The longitudinal discharge pipe 9-2 and the horizontal discharge pipe 9-4 are higher than the hatch cover by 1.5 to 2.5 m, and are supported by the U-shaped pipe clamp and the pillars welded on the closed compartment 5; the vertical discharge 桅 9-3 is high. The hatch cover 5-1 is about 5.5 ~ 6.5m, the top is equipped with a flame arrester and a waterproof cover, and a combustible gas detection probe is arranged on the top of the waterproof cover.

When the flammable gas detection probe detects that there is flammable gas overflow at the discharge dome, an alarm signal will be sent to the central control room. The operator can find the cause of the danger, which may be abnormal discharge or leakage of the safety valve, or leakage of the emergency discharge valve.

Emissions are provided in the front and rear half of the left and right sides of the hull. The leak point is further locked according to the discharge 桅 lock leak zone.

A sewage branch pipe 7-2 communicating with the sewage valve is further disposed on the valve seat 2-5, a unit sewage pipe 7-1 disposed between the two gas cylinders and collecting the sewage branch pipe 7-2, and a drain pipe or a rear pipe by the front half zone a sewage main pipe communicating with the sewage discharge pipe 7-1 of each unit and a gas-liquid separation tank communicating with the sewage discharge pipe, and a stainless steel pipe extending into the bottom of the gas cylinder 2 and communicating with the sewage discharge valve is further disposed in the gas cylinder . A three-way valve is disposed on the first half sewage pipe 7-4 and the second half sewage pipe 7-5, wherein one of the pipes is connected with the sewage main pipe 7-6, and is equipped with a pressure resistant glass pipe and a matching manual valve to form Sewage observation circuit. The pressure-resistant glass tube can withstand pressures below 2~3MPa, so the manual valve can be used to isolate the high and low pressure. Only when the cylinder pressure drops to the specified pressure, the manual valve is opened. At this time, the gas connected to the sewage pipeline is connected. Since the liquid separation tank 7-7 is at normal pressure, the residual hydraulic pressure at the bottom of the cylinder can be used in the gas-liquid separation tank 7-7 by the residual pressure in the cylinder. The discharge can be observed by means of pressure-resistant glass tubes 7-8.

The control unit includes a sub-control station disposed on both sides of the central passage above the airtight compartment 5 and corresponding to the cylinder section, and the sub-control station is provided with an electric control box and a pneumatic control box.

In summary, the CNG carrier of the present invention separates the cylinder body from the pipeline and the control system. The cylinder is set from the bottom of the hull, and the top is pierced by the outlet tube, and the bottle is sealed. The cabin, piping and control system are placed above the hatch to increase the safety of CNG shipping.

Claims

A CNG safe and efficient transport vessel gas cargo system, comprising a hull (1), a gas storage unit limited to the hull (1), a supporting pipeline system, and a corresponding control unit and servo mechanism, characterized in that: The gas storage unit comprises a gas cylinder (2) group arranged in the closed compartment (5) and arranged vertically along the hull, and the upper end of the gas cylinder (2) protrudes out of the airtight compartment (5) by means of the upper end plug assembly, The supporting pipeline system is arranged above and below the airtight compartment (5) by means of an upper end plug assembly and a controlled pneumatic valve, and the control unit and its associated manual control components and random detection display components are arranged in a closed state. Both sides of the circuit above the cabin (5).
The CNG safe and efficient transport vessel gas cargo system according to claim 1, characterized in that the lower end of the gas cylinder (2) is supported by the swing damping mechanism and the bottom of the hull (1), and the middle portion is supported by the strap assembly and the hull ( 1) The upper keel (4) is damped and the upper end is flexibly restrained by the upper end plug assembly and the hatch (5-1) of the closed compartment (5).
The CNG safe and efficient transport vessel gas cargo system according to claim 2, wherein said swing damper mechanism comprises a threaded connection with a lower bottle opening (2-1) of the gas cylinder (2) and a spherical boss Blue (B2), and a flange bracket (B7) welded to the cylinder base (3) and matched with the spherical boss; the flange (B2) is preloaded by a cushioning shock absorbing assembly The bolt (B1) is limited to the cylinder base (3) and forms a swing limit structure with the flange bracket (B7).
The CNG safe and efficient transport vessel gas cargo system according to claim 3, wherein the structure of the buffer damping assembly comprises a set on the pre-tightening bolt (B1) and is respectively disposed on the cylinder base (3). ) rubber spring (B3) and butterfly spring (B5) on the upper and lower end faces.
The CNG safe and efficient transport ship cargo system according to claim 3, characterized in that lubricating oil is filled between the flange (B2) and the flange ring (B7) and sealed by means of a sealing ring; A sealing gasket (B4) is further disposed between the lower end surface of the (3) and the butterfly spring (B5), and a cap type sealing sleeve (B6) sheathed outside the butterfly spring (B5) is fitted to the sealing gasket (B4) on.
The CNG safe and efficient transport vessel cargo system according to claim 2, characterized in that the keel (4) is connected between the two sides of the ship, and the positioning plate of the limit cylinder (2) is arranged on the keel (4) ( M2), the strap assembly includes a strap (M1) surrounding the cylinder (2), and a stud nut pair (M3) disposed on the keel (4) and positioned at both ends of the strap (M1), The gas cylinder (2) forms a limit structure between the positioning plate (M2) and the strap (M1); the height of the strap (M1) is not lower than the height of the center of gravity of the cylinder (2).
The CNG safe and efficient transport vessel gas cargo system according to claim 6, characterized in that a connecting rib (M5) perpendicular to the keel (4) is disposed between two adjacent keels (4), and the positioning is supported by two The end is respectively positioned with the keel (4) and the connecting rib (M5), and the middle portion is provided with abutting portion corresponding to the outer wall of the gas cylinder (2); the positioning plate (M2) and the gas cylinder (2) are positioned and tied A rubber cushion (M4) is provided between the belt (M1) and the cylinder (2).
A CNG safe and efficient transport vessel cargo system according to claim 2, wherein said upper plug assembly comprises The end plug (2-6), which is matched with the upper bottle mouth (2-2) of the gas cylinder (2), and has the inlet and outlet air holes (2-8) and the sewage outlet (2-7), and the end plug (2-6) the connected outlet tube (2-3), and the valve seat (2-5) disposed on the outlet tube (2-3), the middle of the outlet tube (2-3) passes through The hatch cover (5-1) is sealed with the hatch cover (5-1) by means of the organ tube gland (T1).
The CNG safe and efficient transport vessel gas cargo system according to claim 8, wherein the outlet tube (2-3) adopts a double-armed tube structure, and the outer and inner lumens formed by the outlet tube and the inner lumen respectively The gas through holes (2-8) are connected to the sewage outlets (2-7), and the valve seats (2-5) are respectively provided with the inlet and outlet gas passage holes (2-8) and the sewage outlets (2-7). ) Connected inlet and outlet valves and drain valves.
The CNG safe and efficient transport vessel gas cargo system according to claim 8, wherein the hatch cover (5-1) is disposed corresponding to the exit bin (2-3) and has a larger aperture than the bin tube (2-3). a large outhole, with a boss (5-1-1) around the exit hole; a ring protrusion (2-) is provided on the exit pipe (2-3) of the hatch cover (5-1) 4) The organ tube gland (T1) is set between the ring protrusion (2-4) and the boss (5-1-1) to form a flexible limit and sealing structure.
The CNG safe and efficient transport vessel gas cargo system according to claim 1, characterized in that the hull (1) is divided into 3 to 6 closed compartments (5) by means of a partition, and the gas cylinder (2) is in a closed compartment. (5) The inner and outer rows are arranged along the axial direction of the hull, and the loading and unloading gas branch pipes (6-7) communicating with the upper end plug assembly are collected to the unit gas collecting pipe (6-4) disposed in the middle of the two rows of gas cylinders, and the unit gas collecting pipes of each unit (6-4) is collected into the loading and unloading gas main pipe (6-1) through the front half main pipe (6-5) or the rear half main pipe (6-6), and the two ends of the loading and unloading gas main pipe (6-1) are extended. The two sides of the hull (1) are connected to the loading and unloading air base (6-2) by means of the loading and unloading air tube elbow (6-3).
The CNG safe and efficient transport vessel gas cargo system according to claim 11, characterized in that the unit gas collecting pipe (6-4), the front half main pipe (6-5), the rear half main pipe (6-6), and the loading and unloading gas. Controlled pneumatic valves are respectively arranged on the main pipe (6-1), and the respective output ends of the control unit are respectively connected to the control ends of the controlled pneumatic valves.
The CNG safe and efficient transport vessel gas cargo system according to claim 11, characterized in that the unit gas collecting pipe (6-4), the loading and unloading gas main pipe (6-1) and the loading and unloading air pipe bending pipe (6-3) respectively Set the safety drain valve (9-6).
The CNG safe and efficient transport vessel gas cargo system according to claim 13, wherein said safety discharge valve (9-6) is in communication with a safety discharge pipeline subsystem, said safety discharge pipeline subsystem comprising and safe discharge Vertical discharge pipe (9-1) in which the valve (9-6) is connected, a horizontal discharge pipe (9-4) disposed above the vertical discharge pipe (9-1) and collecting the vertical discharge pipe (9-1), a collection place A longitudinal discharge pipe (9-2) of the lateral discharge pipe (9-4) and a vertical discharge port (9-3) communicating with the longitudinal discharge pipe (9-2).
The CNG safe and efficient transport vessel gas cargo system according to claim 13, characterized in that said emergency discharge valve (9-5) is further connected to each unit air outlet pipe (6-4), said emergency discharge Valve (9-5) and safety drain valve (9-6) The vertical discharge pipe (9-1) is connected by means of a downwardly inclined pipe; the liquid discharge ball valve is respectively provided at the bottom ends of the vertical discharge pipe (9-1) and the vertical discharge port (9-3).
The CNG safe and efficient transport vessel gas cargo system according to claim 8, characterized in that a sewage branch pipe (7-2) connected to the sewage valve is further disposed on the valve seat (2-5), and is disposed in the adjacent two rows of gas. The unit sewage pipe (7-1) between the bottles and the sewage branch pipe (7-2), the sewage pipe and the sewage pipe connected to each unit sewage pipe (7-1) by means of the front half sewage pipe or the rear half sewage pipe and the sewage pipe (7-1) The gas-liquid separation tank connected to the sewage main pipe is provided with a stainless steel pipe which extends into the bottom of the gas cylinder (2) and communicates with the sewage discharge valve.