CN115303425A

CN115303425A - Composite material conveying vertical pipe for submarine mining and vertical pipe laying system

Info

Publication number: CN115303425A
Application number: CN202210955588.0A
Authority: CN
Inventors: 郑皓; 黎宙; 张明
Original assignee: Changsha Research Institute of Mining and Metallurgy Co Ltd
Current assignee: Changsha Research Institute of Mining and Metallurgy Co Ltd
Priority date: 2022-08-10
Filing date: 2022-08-10
Publication date: 2022-11-08

Abstract

The invention discloses a composite material conveying vertical pipe for seafloor mining and a vertical pipe laying and recovering system, wherein the composite material conveying vertical pipe comprises a fixed flange, a joint section and a conveying straight pipe, wherein the joint section and the conveying straight pipe are made of composite materials; the conveying vertical pipe laying and recovering system comprises a conveying vertical pipe, a mining ship and a vertical pipe laying and recovering platform arranged on the mining ship. The invention reduces the whole weight of the vertical pipe by adopting the light composite material to manufacture the conveying vertical pipe; each section of the conveying vertical pipe is connected in an inserting mode, and the quick, continuous, distribution and recovery of the conveying vertical pipe on the sea are realized through a vertical pipe distribution and recovery platform arranged on the ship body; the flexible connection is adopted between the conveying vertical pipes, so that the bending moment between the conveying vertical pipes can be released to a certain degree, and the bending damage is avoided; the steel cable is supported below the fixed flange through the connecting fastener, so that each section of the vertical pipe only needs to bear the weight of the section of the vertical pipe, and the total weight of the conveying vertical pipe is reduced to the maximum extent.

Description

Composite material conveying vertical pipe for submarine mining and vertical pipe laying system

Technical Field

The invention relates to the technical field of seafloor mining devices, in particular to a composite material conveying vertical pipe for seafloor mining and a vertical pipe laying system.

Background

With the development of ocean engineering and undersea mining industry, mineral resources are transported from the undersea to the sea surface, riser transportation is the most commercially valuable transportation mode at present, the existing riser transportation basically uses metal risers, each metal riser is dozens of meters long, rigid connection is adopted among the metal risers, and a series vertical system is formed, however, the vertically arranged riser system at least has the following defects:

1. from the vertical distribution of the risers, the upper riser bears the weight of all the risers below the upper riser, so that the wall thickness of the riser at the position is required to be larger to bear the tensile force of the lower part of the upper riser, and the weight of the upper riser is increased due to the large wall thickness, so that the upper riser is required to be thicker and heavier, and the overall quality of the riser is increased, the cost is high, and the installation is difficult;

2. because each section of the vertical pipe is rigidly connected, the vertical pipe can bear huge bending moment and pulling force generated by ocean current and the movement of a supporting platform thereof, and the combined action of the bending moment and the pulling force is a main factor for causing the damage of the vertical pipe;

3. the whole riser is formed by rigidly installing and connecting each section of independent riser, the installation process is time-consuming and labor-consuming, the riser connected to the lower part of the riser needs to be supported and fixed when the current section of riser is connected, otherwise, the alignment and fastening cannot be completed, and the temporarily fixed riser is bent and damaged due to the swinging and movement of a surface ship in the marine environment;

4. the recovery process of the vertical pipe is similar to the distribution and installation process, and the disassembly process of the vertical pipe is complex, time-consuming, labor-consuming and easy to be damaged by stress;

5. the prior vertical pipe joints adopt a hard connection mode, namely the vertical pipe joints use screws and screw fasteners to simultaneously transmit axial force and bending moment, so that the installation and connection of a cluster vertical pipe with a plurality of parallel pipes are difficult or even infeasible;

6. ocean deep water mining often uses large diameter metal risers weighing hundreds or even thousands of tons, and due to the excessive weight, it becomes infeasible or uneconomical to achieve emergency release of the entire riser using the support of the top buoyancy block which is normally stowed inside the hull.

Disclosure of Invention

The invention provides a composite material conveying vertical pipe for seafloor mining and a vertical pipe laying system, which are used for solving the technical problems in the background technology.

In order to solve the technical problem, in a first aspect, the invention provides a composite material conveying riser for seafloor mining, which comprises a fixed flange, a joint section and a conveying straight pipe, wherein the joint section and the conveying straight pipe are made of composite materials, the fixed flange is installed at one end of the joint section in a compounding manner, the other end of the joint section is connected with the conveying straight pipe, and the conveying straight pipe can be inserted into an inner ring of the joint section of another section of the conveying riser and forms flexible connection.

Further, the fixed flange is simultaneously and compositely connected to one end of the joint sections, and the other end of the joint sections is respectively connected to the conveying straight pipes.

Furthermore, a flexible material layer is arranged on the inner ring of the joint section, and the conveying straight pipe can be inserted into the flexible material layer of the joint section of the other conveying vertical pipe, so that the two conveying vertical pipes are flexibly connected.

Furthermore, a plurality of flexible material rings are arranged outside the lower end of the conveying straight pipe, and when the conveying straight pipe is inserted into the inner ring of the joint section of another conveying vertical pipe, the flexible material rings are abutted against the inner ring of the joint section of another conveying vertical pipe, so that the two conveying vertical pipes are flexibly connected.

And the flexible material section is arranged between the joint section and the fixed flange, and the conveying straight pipe is inserted into the flexible material section of the other conveying vertical pipe and the inner ring of the joint section, so that the two conveying vertical pipes are flexibly connected.

Has the beneficial effects that: according to the composite material conveying vertical pipe for seafloor mining, the conveying vertical pipe is made of the light composite material, the weight of the conveying vertical pipe is reduced, the strength of the conveying vertical pipe can be ensured, the bottom conveying straight pipe of one conveying vertical pipe is inserted into the inner ring of the joint section of the other conveying vertical pipe to form flexible connection, so that the conveying vertical pipe can be quickly, continuously and continuously installed in a connected mode, the flexible connection between the conveying vertical pipes can enable the bending moment between the conveying vertical pipes to be released to a certain degree, and bending damage is avoided.

In a second aspect, the present invention also provides a riser deployment and recovery system for seafloor mining comprising: many first aspects transport riser, mining ship and locate riser cloth on the mining ship is put and is retrieved the platform, be equipped with a plurality of steel cable through-hole on the mounting flange, riser cloth is put and is retrieved the platform and include a plurality of winches that are used for releasing or roll up the steel cable, be fixed with on the steel cable with the corresponding connecting firmware in mounting flange position of every section transport riser, the diameter of steel cable connecting firmware is greater than the steel cable through-hole when carrying riser cloth or retrieving connecting firmware butt the lower part of mounting flange, thereby every section is undertaken to the steel cable carry the weight of riser.

Further, the wire rope through hole has an opening, and the diameter of the wire rope is smaller than the diameter of the wire rope through hole opening.

Furthermore, the connecting and fixing part is of a convex two-layer step structure, the diameter of the upper step of the connecting and fixing part is smaller than that of the steel cable through hole and larger than that of the opening of the steel cable through hole, and the diameter of the lower step of the connecting and fixing part is larger than that of the steel cable through hole.

Furthermore, a cable through hole and a clamping ring are further arranged on the fixing flange, the cable through hole is provided with an opening for enabling a cable to pass in and out, and the clamping ring is movably arranged on the fixing flange and used for enabling the opening of the cable through hole to be opened or closed.

The mining ship further comprises an emergency releasable buoyancy block capable of supporting the underwater weight of the whole riser, the emergency releasable buoyancy block is arranged in the center of a moon pool of the mining ship and below the riser arrangement and recovery platform, and the emergency releasable buoyancy block is connected with a movable clamping ring of the moon pool wall through a fixed bayonet on the outer surface.

Furthermore, the vertical pipe laying and recovering platform further comprises a winch platform and an operation platform, the space of a channel in the middle of the winch platform is larger than that of a channel in the middle of the operation platform, the winch is arranged on the winch platform, a steel cable extending out of the winch is arranged in the steel cable through hole after passing through the guide pulley, and the conveying vertical pipe penetrates through the channel in the middle of the operation platform.

The system further comprises a seabed towing vehicle and a repeater, wherein the seabed towing vehicle is arranged on the seabed and is connected with the repeater through a steel cable, and the repeater is connected with the conveying riser.

Has the advantages that: according to the vertical pipe laying and recovering system and the conveying vertical pipe for the submarine mining, disclosed by the invention, the steel cable is extended into the steel cable through hole, and the connecting fastener supports the lower part of the fixing flange, so that the steel cable provides tension for the conveying vertical pipe, each vertical pipe only needs to bear the weight of the vertical pipe, the total weight of the conveying vertical pipe can be reduced to the greatest extent, the conveying vertical pipes are flexibly connected in an inserting manner, and the conveying vertical pipes can be quickly, continuously and connectively installed.

In addition to the above-described objects, features and advantages, the present invention has other objects, features and advantages. The present invention will be described in further detail below with reference to the accompanying drawings.

Drawings

The accompanying drawings, which are incorporated in and constitute a part of this application, are included to provide a further understanding of the invention, and are incorporated in and constitute a part of this specification. In the drawings:

FIG. 1 is a schematic structural view of a riser deployment and recovery system for seafloor mining in accordance with a preferred embodiment of the invention;

FIG. 2 is a schematic structural view of a riser deployment and recovery platform of the riser deployment and recovery system for seafloor mining of the preferred embodiment of the present invention;

FIG. 3 is a perspective view of a winch platform of the riser deployment and recovery system for seafloor mining of the preferred embodiment of the present invention;

FIG. 4 is a schematic illustration of the connection of the wire rope and the mounting flange of the riser deployment and retrieval system for seafloor mining of the preferred embodiment of the present invention;

FIG. 5 is a schematic structural view of a fixing flange of a riser deployment and recovery system for seafloor mining in accordance with a preferred embodiment of the present invention;

FIG. 6 is a schematic diagram of the construction of an emergency releasable buoyancy block of the riser deployment and recovery system for seafloor mining of the preferred embodiment of the present invention;

FIG. 7 is a schematic diagram of the connection of the cables and the fixed flange of the riser deployment and recovery system for seafloor mining of the preferred embodiment of the present invention;

FIG. 8 is a schematic structural diagram of a composite transfer riser diagram of the riser deployment and recovery system for seafloor mining of the preferred embodiment of the present invention;

FIG. 9 is a first schematic construction of a composite material transfer riser for seafloor mining of the preferred embodiment of the invention;

FIG. 10 is a second schematic illustration of a composite material transfer riser for seafloor mining in accordance with a preferred embodiment of the invention;

fig. 11 is a third structural view of a composite material transfer riser for seafloor mining in accordance with a preferred embodiment of the present invention.

The reference numerals in the figures denote:

100. a transfer riser; 110. fixing the flange; 111. a wire rope through hole; 112. a cable through hole; 113. a snap ring; 120. a joint section; 121. a layer of flexible material; 130. conveying a straight pipe; 131. a ring of flexible material; 140. a segment of flexible material; 200. a mining vessel; 300. a stand pipe laying and recovering platform; 310. a wire rope; 311. connecting the firmware; 320. a winch; 330. a winch platform; 340. an operation platform; 350. a guide pulley; 360. a tower; 400. emergency releasable buoyancy blocks; 500. a cable; 600. a subsea tow truck; 601. a steel cord; 700. a repeater.

Detailed Description

Embodiments of the invention will be described in detail below with reference to the drawings, but the invention can be implemented in many different ways as defined and covered by the claims.

In addition, unless otherwise defined, technical or scientific terms used in the description of the present application shall have the ordinary meaning as understood by one of ordinary skill in the art to which the present application belongs. The terms "upper", "lower", "left", "right", "center", "vertical", "horizontal", "inner", "outer", and the like used in the description of the present application, which indicate orientations, are used only to indicate relative directions or positional relationships, and do not imply that the devices or elements must have a specific orientation, be constructed and operated in a specific orientation, and when the absolute position of the object to be described is changed, the relative positional relationships may be changed accordingly, and thus, should not be construed as limiting the present application. The use of "first," "second," "third," and the like in the description of the present application is for descriptive purposes only to distinguish between different components and is not to be construed as indicating or implying relative importance. The use of the terms "a," "an," or "the" and similar referents in the description of the application should not be construed as an absolute limitation of quantity, but rather as the presence of at least one. The use of the terms "comprising" or "including" and the like in the description of the present application is intended to indicate that the element or item preceding the term covers the element or item listed after the term and its equivalents, without excluding other elements or items.

It should also be noted that, unless expressly stated or limited otherwise, the words "mounted," "connected," and the like in the description of the present application are to be construed broadly and encompass, for example, connections that may be fixed or removable or integral; can be mechanically or electrically connected; they may be directly connected or indirectly connected through an intermediate medium, or they may be connected through the inside of two elements, and those skilled in the art can understand their specific meaning in the present application according to their specific situation.

Example 1, a first composite material transfer riser for seafloor mining.

As shown in fig. 8, the composite material conveying riser for seafloor mining of the embodiment comprises a fixed flange 110, and a joint section 120 and a conveying straight pipe 130 which are made of composite materials, wherein the fixed flange 110 is compositely installed at one end of the joint section 120, the other end of the joint section 120 is connected with the conveying straight pipe 130, and the conveying straight pipe 130 can be inserted into the inner ring of the joint section 120 of another conveying riser and forms a flexible connection.

The vertical conveying pipe 100 in this embodiment is in a socket type to enhance the overall quick connection performance, the joint section 120 and the straight conveying pipe 130 are integrally and compositely manufactured by using a composite material, and together form a vertical pipe main body of the vertical conveying pipe, the fixing flange 110 may be a composite material or a metal material, and in this embodiment, the fixing flange 110 is specifically a metal material.

Specifically, the joint section 120 and the conveying straight pipe 130 of this embodiment may be made of a composite material such as glass fiber reinforced plastic and carbon fiber, which is light in weight, high in strength, and corrosion resistant, the composite material in this embodiment is illustrated by taking glass fiber reinforced plastic as an example, and the inner walls of the joint section 120 and the conveying straight pipe 130 may be provided with a wear-resistant layer for reducing the wear of the conveying mineral and the inner walls, and enhancing the wear resistance of the conveying straight pipe 130.

The inner ring of the joint section 120 is provided with a flexible material layer 121, the conveying straight pipe 130 can be inserted into the flexible material layer 121 of the joint section 120 of another conveying vertical pipe 100 to form flexible connection, the flexible material layer 121 is specifically a rubber structure layer, and when the conveying straight pipe 130 is inserted into the inner ring of the joint section 120 of another conveying vertical pipe, flexible connection is formed between the two conveying vertical pipes 100 and sealing is formed.

It should be noted that the spatial positions of the fixed flange 110 and the straight delivery pipe 130 of the vertical delivery pipe 100 can be changed up and down, and the positions and shapes of the flange through holes are changed accordingly.

According to the composite material conveying vertical pipe for seafloor mining, the joint section 120 and the conveying straight pipe 130 are made of glass fiber reinforced plastics, and the fixing flange 110 is made of a metal material, so that the overall quality of the conveying vertical pipe 100 can be greatly reduced, and the overall strength of the conveying vertical pipe 100 is ensured; the conveying vertical pipes 100 are inserted to form flexible sealing connection and used for bearing bending moment among the conveying vertical pipes 100, so that the bending moment among the conveying vertical pipes 100 is released to a certain degree, and bending damage is avoided; the connection of the vertical conveying pipe 100 is realized in an inserting mode, so that the vertical conveying pipe 100 is higher in assembly and disassembly efficiency.

Example 2, a second composite transfer riser for seafloor mining.

As shown in fig. 10, the present embodiment is different from embodiment 1 in that: the inner ring of the joint section 120 is not provided with a layer of flexible material 121, in this embodiment, the lower end of the delivery straight pipe 130 is externally provided with a plurality of flexible material rings 131, and when the delivery straight pipe 130 is inserted into the inner ring of the joint section 120 of another delivery riser, the flexible material rings 131 abut against the inner ring of the joint section 120 to form flexible connection.

Specifically, the flexible material rings 131 at the lower end of the conveying straight pipe 130 may be set to any number according to requirements, in this embodiment, 2 flexible material rings are specifically used as an example for description, and the flexible material rings 131 are specifically rubber rings and are disposed at the lower end of the conveying straight pipe 130, so that the conveying straight pipe 130 can be directly inserted into the joint section 120, and flexible connection and sealing are formed between the two conveying vertical pipes 100.

According to the composite material conveying vertical pipe for seafloor mining, 2 rubber rings are arranged at the lower end of the conveying vertical pipe 100, so that when the conveying straight pipe 130 is inserted into the joint section 120 of another section of the conveying vertical pipe 100, the rubber rings abut against the inner wall of the joint section 120, the conveying straight pipe 130 and the joint section 120 form flexible sealing connection, the flexible sealing connection is used for bearing the bending moment between the conveying vertical pipes 100, the bending moment between the conveying vertical pipes 100 is released to a certain degree, and bending damage is avoided; the connection of the vertical conveying pipe 100 is realized in an inserting mode, so that the vertical conveying pipe 100 is higher in dismounting efficiency.

Example 3, third composite transfer riser for seafloor mining.

As shown in fig. 11, the present embodiment is different from embodiment 1 in that: the inner ring of the joint section 120 is not provided with a layer of flexible material layer 121, and in this embodiment, the flexible material layer further includes a flexible material section 140, the flexible material section 140 is installed between the joint section 120 and the fixing flange 110, and the transmission straight pipe 130 is inserted into the flexible material section 140 of another transmission vertical pipe and the inner ring of the joint section 120, so that the two transmission vertical pipes 100 form a flexible connection.

Specifically, in this embodiment, the flexible material segment 140 is made of a rubber material, the flexible material segment 140 is installed at an end of the joint segment 120 far from the transport straight pipe 130, the fixing flange 110 is installed at an end of the flexible material segment 140, the transport straight pipe 130 is inserted into the flexible material segment 140 of another transport vertical pipe 100 and an inner ring of the joint segment 120, so that the transport straight pipe 130 abuts against the flexible material segment 140 made of the rubber material, and flexible connection and sealing are formed between the two transport vertical pipes 100 after socket joint.

According to the composite material conveying riser for seafloor mining of the embodiment, the flexible material section 140 made of rubber is arranged between the joint section 120 and the fixed flange 110, so that the conveying straight pipe 130 is inserted into the flexible material section 140 of the other conveying riser 100 and the inner ring of the joint section 120, and the inserted conveying straight pipe 130 and the joint section 120 form flexible sealing connection for bearing the bending moment between the conveying risers 100, so that the bending moment between the conveying risers 100 is released to a certain extent, and bending damage is avoided; the connection of the vertical conveying pipe 100 is realized in a plugging mode, so that the vertical conveying pipe 100 is higher in assembly and disassembly efficiency

Example 4, fourth composite transfer riser for seafloor mining.

As shown in fig. 9, the present embodiment is different from embodiment 1 or embodiment 2 or embodiment 3 in that, in the composite material transport riser for seafloor mining of the present embodiment, the fixing flange 110 may be simultaneously compositely connected to one ends of a plurality of joint segments 120, and the other ends of the plurality of joint segments 120 are respectively connected to ends of a plurality of transport straight pipes 130.

In this embodiment, the fixing flange 110 is connected to the end of 2 joint segments 120 at the same time for illustration, and the socket manner can realize socket joint of two vertical conveying pipes 100 after consolidation, thereby greatly reducing the connection laying and recovery time of the vertical conveying pipes 100.

The composite material conveying riser for seafloor mining of the embodiment has the advantages that the two joint sections 120 and the two conveying straight pipes 130 are arranged on the fixing flange 110 of each conveying riser 100, so that two conveying pipelines are bundled in each conveying riser 100, and the two conveying pipelines are simultaneously connected during installation, so that the installation efficiency is higher.

As shown in fig. 1, the riser deployment and recovery system for seafloor mining of the present embodiment includes: the mining and recovery platform 300 comprises a plurality of conveying risers 100, a mining ship 200 and a riser deployment and recovery platform 300 arranged on the mining ship 200, wherein a plurality of steel cable through holes 111 are formed in a fixing flange 110, the riser deployment and recovery platform 300 comprises a plurality of winches 320 used for releasing or rolling up steel cables 310 and towers 360 used for transporting the conveying risers 100, connecting fasteners 311 corresponding to the positions of the fixing flanges 110 of the conveying risers 100 are fixed on the steel cables 310, the diameters of the connecting fasteners 311 are larger than the steel cable through holes 111, and the connecting fasteners 311 abut against the lower parts of the fixing flanges 110 when the conveying risers 100 are deployed or recovered, so that the steel cables 310 bear the weight of the conveying risers 100.

The transfer riser 100 can be the transfer riser 100 in any of embodiments 1 to 4, and as shown in fig. 8, the transfer riser 100 in embodiment 1 is specifically used in this embodiment.

As shown in fig. 2 and 3, in the marine riser deployment and recovery system of this embodiment, the riser deployment and recovery platform 300 further includes a winch platform 330 and a working platform 340, a passage space in the middle of the winch platform 330 is larger than a passage in the middle of the working platform 340, the winch 320 is disposed on the winch platform 330, a steel cable 310 extending from the winch 320 passes through the guide pulley 350 and then is disposed in the cable through hole 111, and the transportation riser 100 passes through the passage in the middle of the working platform 340.

The riser deployment and recovery platform 300 is located below the tower 360, the upper layer is a winch platform 330 and is used for installation and control of a winch 320, the lower layer is an operation platform 340 and is used for assisting connection between the conveying risers 100 and connection and fixation between the steel cables 310 and the fixing flange 110, the conveying risers 100 are deployed and recovered through the steel cables 310, each steel cable is connected with 1 winch, in the embodiment, the deployment through 5 steel cables 310 is specifically taken as an example for explanation, and continuous and rapid deployment and recovery of the conveying risers 100 can be realized by synchronously controlling actions of the 5 winches 320. Because the through hole in the middle of the winch platform 330 is larger than the through hole in the middle of the operation platform 340, the space of the vertical conveying pipe 100 gradually becomes smaller from top to bottom, the large opening at the upper end enables the vertical conveying pipe 100 to better enter, and the small opening at the lower end can limit the position of the vertical conveying pipe 100.

As shown in fig. 4 and 5, the wire rope 310 of the winch 320 is replaceable, the wire rope 310 with a smaller diameter is used in the early stage of deployment, the diameter of the wire rope 310 is gradually increased according to the load of the deployment system along with the increase of the deployment depth, each wire rope 310 is provided with a connecting fastener 311 connected with the wire rope through hole 111, the connecting fastener 311 is in a convex two-layer step structure, the diameter of the upper step of the connecting fastener 311 is smaller than that of the wire rope through hole 111 and larger than the opening diameter of the wire rope through hole 111, and the diameter of the lower step of the connecting fastener 311 is larger than that of the wire rope through hole 111, so that the upper step is matched with the wire rope through hole 111, and the tight connection of the wire rope 310 and the fixing flange 110 is ensured; the lower step is mainly used for bearing the axial force of the connecting and conveying riser 100, the distance between adjacent connecting fasteners 311 is not less than the distance between adjacent fixing flanges 110, wherein the optimal distance is that the distance between adjacent connecting fasteners 311 is equal to the distance between adjacent fixing flanges 110, in this embodiment, in order to ensure the safety of the connection while ensuring a little installation margin, the distance between adjacent connecting fasteners 311 is greater than the distance between adjacent fixing flanges 110, but the difference between the distance between adjacent connecting fasteners 311 and the distance between adjacent fixing flanges 110 cannot exceed the height of the connecting fasteners 311.

It should be noted that in other embodiments, a cylindrical connecting fastener 311 can be used, the diameter of the cylinder is larger than the diameter of the cable through hole 111, and when the transmission riser 100 sinks due to gravity, the connecting fastener 311 on the cable 310 directly abuts against the lower end of the fixing flange 110, so that the cable 310 can bear the weight of each transmission riser 100.

As shown in fig. 6, in the marine riser deployment and recovery system of this embodiment, the system further includes an emergency releasable buoyancy block 400 capable of supporting the underwater weight of the whole riser, the emergency releasable buoyancy block 400 is disposed at the center of the moon pool of the mining ship 200 and below the riser deployment and recovery platform 300, and the emergency releasable buoyancy block 400 is connected to the movable snap ring of the moon pool wall through a fixed bayonet on the outer surface.

The emergency releasable buoyancy block 400 is located in the center of a moon pool of the mining ship 200, a riser is arranged below the recovery platform 300, the emergency releasable buoyancy block 400 mainly comprises buoyancy materials or hollow buoyancy tanks, positioning devices and buoys are arranged in the emergency releasable buoyancy block 400 after emergency load throwing, so that positioning searching of the conveying riser 100 is facilitated after emergency, fixing bayonets are arranged on the outer surface of the emergency releasable buoyancy block 400 and are respectively fixed with the moon pool wall through movable clamping rings, in emergency, support of the conveying riser 100 is firstly transferred to the emergency releasable buoyancy block 400, the upper end of a steel cable 310 is locked on the emergency releasable buoyancy block 400, meanwhile, the connection of the steel cable 310 and the conveying riser 100 with a ship body is released, and the opening and closing of the clamping rings are controlled, so that the steel cable 310 and the conveying riser 100 can be rapidly released through being connected with the emergency releasable buoyancy block 400, and the emergency releasable buoyancy block 400 is disconnected with the mining ship 200 as a whole, and system load throwing is achieved.

As shown in fig. 5 and 7, in the marine riser deployment and recovery system of this embodiment, the fixing flange 110 is further provided with a cable through hole 112 and a snap ring 113, the cable through hole 112 has an opening for allowing the cable 500 to enter and exit, the snap ring 113 is movably mounted on the fixing flange 110 for opening or closing the opening of the cable through hole 112, and after the cable 500 enters the cable through hole 112, the snap ring 113 closes the opening of the cable through hole 112, so that the cable 500 can be prevented from drifting away.

In this embodiment, the cables 500 may be optical fibers or electric cables, one or more cables 500 may be laid together, the deformation of the riser may be measured by a special optical fiber, or the underwater equipment may be powered by the electric cables.

In the marine riser deployment and recovery system of the present embodiment, the system further comprises a submarine towing vehicle 600 and a repeater 700, wherein the submarine towing vehicle 600 is disposed on the seabed, the repeater 700 is connected through a steel cable 601, and the repeater 700 is connected to the transfer riser 100.

Since the transfer riser 100 is influenced by strong ocean currents during operation, which causes the transfer riser 100 and the relay station 700 to drift in the direction of the ocean currents, the present embodiment controls the underwater position of the relay station 700 by arranging the submarine towing vehicle 600 on the seabed below the relay station 700, and the submarine towing vehicle 600 is connected with the relay station 700 through the steel cable 601, and in other embodiments, the submarine relay station 700 can be used alternatively.

In this embodiment, the conveying riser 100 is the conveying riser 100 of embodiment 1, the conveying riser 100 in this embodiment adopts a socket joint type to enhance the overall connection performance, the composite material of the joint section 120 and the conveying straight pipe 130 is specifically glass fiber reinforced plastic, and the inner walls of the joint section 120 and the conveying straight pipe 130 are provided with wear-resistant layers for reducing the abrasion between the conveying minerals and the inner walls and enhancing the wear resistance of the joint section 120 and the conveying straight pipe 130; the flexible material layer 121 of this embodiment is specifically a rubber layer, so that the joint section 120 becomes a bending moment releasing joint to reduce the influence of ocean currents, internal waves and the like on the bending of the conveying vertical pipe 100, the fixing flange 110 is made of a metal material, and the joint section 120 and the conveying straight pipe 130 are manufactured by adopting an integrated composite processing.

The working principle of the embodiment is as follows: in the embodiment, the transfer riser 100 is continuously deployed and recovered through 5 steel cables 310, the connection between the transfer riser 100 and the steel cables 310 is connected through a connecting fastener 311, and an upward pulling force is applied to the first subsea transfer riser 100 through the steel cables 310, so that the weight of the transfer riser 100 is prevented from being borne by the upper transfer riser 100; the vertical conveying pipes 100 adopt a quick plug-in type structure, so that quick connection and disassembly are facilitated, the steel cables 310 are connected with the connecting fasteners 311 in a compression joint mode and can be processed in advance, and rubber layers exist among the vertical conveying pipes 100 to bear bending moment among the vertical conveying pipes 100; cables and/or optical cables can be laid along with the laying of the conveying vertical pipe 100, and the cables and/or the optical cables are used for underwater power supply or monitoring the form of the conveying vertical pipe 100 and are communicated with an ocean current speed measuring device; the conveying riser 100 is arranged and recovered through a channel in the middle of the emergency releasable buoyancy block 400, emergency release can be performed when sea conditions are poor, and the emergency releasable buoyancy block 400 can provide buoyancy for a conveying pipeline so as to facilitate subsequent reconnection and operation; a seabed towing vehicle 600 which can be used for seabed walking is arranged below the relay station 700, and the form of the conveying riser 100 can be dynamically adjusted according to the change condition of ocean current.

The marine riser deployment and recovery system of the present embodiment can only bear the weight of each section of the transfer riser 100, thereby reducing the overall weight of the transfer riser 100; the bending moment of the conveying vertical pipe 100 is released to a certain degree, so that bending damage is avoided; the device can be quickly, continuously, connected, installed and recycled; in case of emergency, the transfer riser 100 is safely and quickly disconnected from the hull, and the transfer riser 100 is ensured to be reconnected for use after the emergency.

The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A composite material conveying riser for seafloor mining is characterized by comprising a fixing flange (110), a joint section (120) and a conveying straight pipe (130), wherein the joint section (120) and the conveying straight pipe (130) are made of composite materials, the fixing flange (110) is installed at one end of the joint section (120) in a composite mode, the other end of the joint section (120) is connected with the conveying straight pipe (130), and the conveying straight pipe (130) can be inserted into the inner ring of the joint section (120) of another section of conveying riser and forms flexible connection.

2. The composite material transfer riser for seafloor mining of claim 1, wherein the fixed flange (110) is simultaneously composite connected to one end of a plurality of the joint segments (120), and the other end of the plurality of joint segments (120) is connected to a plurality of the transfer straight pipes (130), respectively.

3. Composite material transfer riser for seafloor mining according to claim 1 or 2, wherein the inner ring of the joint section (120) is provided with a layer of flexible material (121), and the transfer straight pipe (130) can be inserted into the layer of flexible material (121) of the joint section (120) of another transfer riser to form a flexible connection between the two transfer risers.

4. A composite material transfer riser for seafloor mining as claimed in claim 1 or 2, wherein the transfer pipe (130) is externally provided with a number of rings (131) of flexible material at its lower end, the rings (131) of flexible material abutting the inner ring of the coupling section (120) of another transfer riser when the transfer pipe (130) is inserted into the inner ring of the coupling section (120) of another transfer riser, so that the two transfer risers form a flexible connection.

5. A composite material transfer riser for seafloor mining as claimed in claim 1 or 2, further comprising a section of flexible material (140), the section of flexible material (140) being mounted between the joint section (120) and the fixing flange (110), the transfer pipe (130) being inserted into the flexible material section (140) of another transfer riser and the inner ring of the joint section (120) to form a flexible connection for the two transfer risers.

6. A riser deployment and recovery system for seafloor mining, comprising: a plurality of transport risers (100) according to any of claims 1 to 5, a mining vessel (200) and a riser deployment and retrieval platform (300) provided on said mining vessel (200), said fixing flange (110) having a plurality of cable through holes (111), said riser deployment and retrieval platform (300) comprising a plurality of winches (320) for releasing or winding up the cables (310), said cables (310) having fixed thereto connection members (311) corresponding to the position of the fixing flange (110) of each transport riser (100), said cable connection members (311) having a diameter greater than that of said cable through holes (111), said connection members (311) abutting against the lower portion of said fixing flange (110) when said transport risers (100) are deployed or retrieved, whereby said cables (310) bear the weight of each transport riser (100).

7. Riser deployment and retrieval system for seafloor mining of claim 6, wherein the wireline throughbore (111) has an opening, the diameter of the wireline (310) being smaller than the diameter of the wireline throughbore (111) opening.

8. Riser deployment and retrieval system for seafloor mining according to claim 7, wherein the connection fastener (311) is a zigzag two-step structure, the diameter of the upper step of the connection fastener (311) is smaller than the diameter of the wireline through-hole (111) and larger than the diameter of the opening of the wireline through-hole (111), and the diameter of the lower step of the connection fastener (311) is larger than the diameter of the wireline through-hole (111).

9. Riser deployment and retrieval system for seafloor mining according to claim 6, wherein the fixed flange (110) is further provided with a cable through hole (112) and a snap ring (113), the cable through hole (112) is provided with an opening for passing in and out a cable (500), and the snap ring (113) is movably mounted on the fixed flange (110) for opening or closing the opening of the cable through hole (112).

10. The riser deployment and recovery system for seafloor mining of claim 6, further comprising an emergency releasable buoyancy block (400) capable of supporting the underwater weight of a whole riser, the emergency releasable buoyancy block (400) being located centrally in the moon pool of the mining vessel (200) and below the riser deployment and recovery platform (300), the emergency releasable buoyancy block (400) being connected to a removable snap ring of the moon pool wall by a fixed bayonet on the outer surface.

11. The riser deployment and recovery system for seafloor mining of claim 6, wherein the riser deployment and recovery platform (300) further comprises a winch platform (330) and a working platform (340), the passage space in the middle of the winch platform (330) is larger than the passage in the middle of the working platform (340), the winch (320) is arranged on the winch platform (330), the steel cable (310) extending from the winch (320) passes through a guide pulley (350) and is arranged in the cable through hole (111), and the conveying riser (100) passes through the passage in the middle of the working platform (340).

12. The riser deployment and recovery system for seafloor mining of claim 6, further comprising a seafloor hauler vehicle (600) and a repeater (700), the seafloor hauler vehicle (600) being located on the seafloor, the repeater (700) being connected by a steel cable (601), the repeater (700) being connected to the transport riser (100).