A marine slurry lift riser system

Abstract

A kind of marine ore pulp lifting riser system, including lifting riser connected with the pipe ship connecting device of mother ship, watertight box, motor;Lifting riser is connected by pipe section, pipe section two ends are equipped with flange, hollow layer between inner tube, outer tube and two end flanges are welded to form annular cabin;Outer tube is closed cylindrical pipe, defined as buoyancy pipe section, and the annular cabin of buoyancy pipe section is buoyancy cabin;Each buoyancy cabin bottom is equipped with watertight sensor;Lower part of lifting riser, at least includes a pipe section on outer tube, is equipped with water inlet, water outlet with annular cabin, defined as ballast pipe section, and the annular cabin of ballast pipe section is ballast cabin;Each ballast cabin is equipped with liquid level sensor in height direction;Water injection, discharge driving element of ballast is equipped on the water inlet, water outlet;Lower part of the lifting riser is also equipped with fixed anchor;So as to overcome the defects such as self weight, drift, resonance, installation difficulty of existing deep sea mining lifting riser device, improve deep sea mining efficiency.

Description

[0001] The present application is a divisional application of the patent application No. 2024102803268, with the application date of March 12, 2024, and the invention name of "A deep-sea mining lifting riser device". TECHNICAL FIELD

[0002] The present application relates to a deep-sea mining lifting riser device, in particular to a deep-sea mining steel lifting riser, belonging to the field of ocean engineering. BACKGROUND

[0003] Deep-sea mining generally takes a surface mother ship as the support platform of the system. Under the pipe-ship connecting device at the bottom of the ship, a slurry lifting riser is connected to a few hundred meters away from the seabed. The top end of the lifting riser is connected to the pipe-ship connecting device, and the bottom end of the lifting riser is connected to a lifting pump group, a hose, and a seabed mining vehicle. The mining vehicle works on the seabed, and the collected slurry is transported to the inlet of the lifting pump group by the material pump through the hose, and then the slurry is transported to the surface mother ship by the lifting pump group through the lifting riser.

[0004] The so-called pipe-ship connecting device is a connecting pipe installed at the bottom of the mother ship, which contains a cylindrical pair and a spherical pair, and connects the lower end flange of the connecting pipe to the upper end flange of the lifting riser. The cylindrical pair of the connecting pipe ensures that the connecting pipe can move up and down along the axis of the connecting pipe, thereby avoiding the interference of the up and down vibration of the lifting riser on the mother ship after the connecting pipe is connected to the lifting riser. The spherical pair of the connecting pipe can rotate in three directions at the spherical support of the connecting pipe, thereby avoiding the interference of the lifting riser on the longitudinal inclination, lateral inclination, and rotation of the mother ship after the connecting pipe is connected to the lifting riser, thereby ensuring the safety of the mother ship at sea. For example, the patent publication No. CN112127892B and the patent name "A pipe-ship connecting device for deep-sea mining ship" are examples of the pipe-ship connecting device.

[0005] Since the deep-sea mining lifting riser is thousands of meters long, and the steel lifting riser is only tens of meters long, the time required for laying the lifting riser is relatively long, and vice versa. When a storm hits, the time for obtaining a forecast is usually short, so when the mother ship needs to evacuate for emergency, the lifting riser is difficult to recover in a short time. The current common practice is to disconnect the pipe-ship connecting device and the lifting riser, and let the mother ship evacuate alone. The lifting riser sinks to the bottom for safety by its own weight, and then the mother ship returns to the working sea area when the sea conditions are normal. The lifting riser is lifted from underwater, reconnected to the pipe-ship connecting device on the mother ship, and then the mining operation is carried out.

[0006] To avoid the state of drifting, large angle twisting and even overturning after the submerged riser is separated from the mother ship, the patent application with the application number CN 116220690 A and the title Deep-sea mining mineral conveying pump pipe system suitable for emergency evacuation demand in severe sea conditions uses high-pressure flexible air bags to generate buoyancy, so that the submerged underwater conveying pump pipe system remains upright underwater; due to the opening of the air bags, the resistance surface of the underwater conveying pump pipe system under the action of underwater currents increases, so the force acting on the underwater conveying pump pipe system is also greater, that is, the system not only cannot avoid the drifting of the underwater conveying pump pipe system, on the contrary, the drifting distance of the underwater conveying pump pipe system under the action of underwater currents may be farther; in addition, the application also has the following defects: first, when the underwater conveying pump pipe system is working normally, the air bags are contracted, and the weight of the underwater conveying pump pipe system is entirely borne by the mother ship, which increases the self-weight of the mother ship. Second, after the underwater conveying pump pipe system is submerged, it remains upright underwater, and the top end is generally several hundred meters away from the sea surface, so it is difficult to connect the top of the submerged underwater conveying pump pipe with the mother ship; third, there is no measure to adjust the vibration frequency of the underwater conveying pump pipe system during assembly, which cannot effectively avoid the resonance generated during the assembly of the underwater conveying pump pipe system, affecting the assembly of the underwater conveying pump pipe system; the function of the "underwater conveying pump pipe system" in the patent application corresponds to the function of the "riser lifting device" in the present application.

[0007] In summary, the current deep-sea mining riser lifting device has the following problems: first, the connection of the riser with the mother ship increases the self-weight of the mother ship and increases the draft of the mother ship when it is empty; second, after the riser lifting device is separated from the mother ship, it drifts uncontrollably under the action of underwater currents; third, the submerged riser lifting device is difficult to connect with the mother ship again due to the deep sinking depth; fourth, it cannot effectively avoid the resonance generated during the assembly of the riser. SUMMARY

[0008] The purpose of the present application is to overcome the defects of the current deep-sea mining riser lifting device, such as resonance generated during assembly, large self-weight, uncontrollable drifting of the riser after separation from the mother ship, and difficulty in connecting the submerged riser lifting device with the mother ship again, and to invent a deep-sea mining riser lifting device to solve the above-mentioned defects and improve the efficiency of deep-sea mining.

[0009] To achieve the above-mentioned purpose, the present application realizes the following technical solutions.

[0010] The deep-sea mining lifting riser device comprises a lifting riser connected with a pipe ship connecting device of a mother ship, a watertight box, a motor and a signal buoy; the lifting riser comprises at least two fixedly connected pipe sections, characterized in that the pipe section is a double-layer sleeve pipe, flanges are arranged at two ends of the pipe section, and a hollow layer between the inner layer pipe and the outer layer pipe and the two end flanges are welded to form an annular cabin; the outer layer pipe is a closed cylindrical pipe, the pipe section is defined as a buoyancy pipe section, and the annular cabin is defined as a buoyancy cabin; the lower part of the lifting riser comprises at least one pipe section provided with a water injection port and a water discharge port communicating with the annular cabin on the outer layer pipe, the pipe section is defined as a ballast pipe section, and the annular cabin is defined as a ballast cabin; the water injection port and the water discharge port are provided with driving members for injecting and discharging ballast water; and the lower part of the lifting riser is further provided with an anchor.

[0011] The object of the present application can also be further achieved by the following technical solutions.

[0012] The pipe hole of the inner layer pipe is coated with wear-resistant material.

[0013] The ballast pipe section is provided with the water injection port at the upper part of the ballast cabin and the water discharge port at the lower part of the ballast cabin.

[0014] The lifting riser device is in seawater, and the buoyancy of the ballast pipe section is greater than the self-weight before ballasting.

[0015] The upper and lower flange surfaces of the annular cabin of the bottom pipe section of the lifting riser are provided with watertight sockets, and the upper and lower watertight sockets are correspondingly connected by a cable; the upper flange surface of the annular cabin of each pipe section of the lifting riser except the bottom pipe section is provided with a watertight socket, the lower flange surface is correspondingly provided with a watertight socket protection hole penetrating through the flange, one end of the cable is connected with the watertight socket, and the other end of the cable is provided with a watertight plug which penetrates out of the protection hole of the annular cabin; and the watertight plug of the upper flange surface of the top pipe section of the lifting riser is connected with the watertight plug of the power system and the control system of the mother ship.

[0016] The driving member, the driving member for injecting ballast water into the ballast cabin is a water injection electromagnetic valve; the water injection electromagnetic valve inlet P is provided with a filter screen and is connected with the sea; the water injection electromagnetic valve outlet A is connected with the water injection port of the ballast cabin; the driving member for discharging ballast water from the ballast cabin is a hydraulic pump, the hydraulic pump inlet is provided with a water discharge electromagnetic valve, the water discharge electromagnetic valve outlet A is connected with the water injection port of the ballast cabin, the water discharge electromagnetic valve inlet P is connected with the water discharge port of the ballast cabin, the hydraulic pump outlet is provided with a one-way valve, the one-way valve outlet is provided with a water outlet and is connected with the sea; and the hydraulic pump is driven by the motor.

[0017] The water injection electromagnetic valve, the hydraulic pump, the motor, the water discharge electromagnetic valve and the one-way valve are arranged in the watertight box; the watertight box is fixedly connected with the lower part of the lifting riser, and the water discharge electromagnetic valve inlet P and the hydraulic pump inlet are not higher than the water discharge port of the ballast pipe section.

[0018] The cable is a power line of a hydraulic pump and a control line of a solenoid valve.

[0019] The mother ship is also provided with a set of standby cables of the power lines of the hydraulic pumps and the control lines of the solenoid valves; one end of the standby cables is sealingly fixed to a water-tight socket of the signal buoy and can be connected to water-tight plugs of the power system and the control system of the mother ship; the other end of the standby cables is connected to a water-tight socket of the upper end of the riser; when the mother ship leaves, the water-tight plug of the standby cable of the signal buoy is connected to the water-tight socket of the upper end of the riser, the signal buoy floats on the sea surface of the riser and can send position information in time.

[0020] The upper flange of each pipe section is also provided with two positioning pins, and the lower flange is provided with corresponding positioning pin holes; and the pipe sections are provided with sealing pads.

[0021] The advantages and beneficial effects of the present application are as follows:

[0022] The riser device for deep-sea mining of the present application assembles the riser by pipe sections, the buoyancy pipe section is provided with a buoyancy chamber, the riser device is affected by the buoyancy of the buoyancy chamber, and the buoyancy is greater than the weight, so that the riser does not sink to the bottom under water, therefore, when the riser is connected to the pipe-ship connecting device of the mother ship, the pipe-ship connecting device of the mother ship does not bear the weight of the riser, that is, the draft of the mother ship does not change after the riser is connected; when the riser is connected to the mother ship, the lower part of the riser is hinged to one end of the anchor chain, and the other end of the anchor chain is connected to the anchor suspended in the water, which does not affect the movement of the mother ship; after the riser is separated from the mother ship, the riser sinks to the bottom under the pressure of the ballast chamber, and the anchor chain sinks the anchor into the seabed, and the anchor restricts the drift of the riser on the seabed.

[0023] The ballast pipe section is arranged at the lower part of the riser, the upper part of the ballast pipe section is provided with a water inlet, and the lower part of the ballast pipe section is provided with a water outlet; if the ballast pipe section is more than one section, in order to lower the center of gravity of the riser, when the riser needs to sink, the ballast chambers of the pipe sections are sequentially water-filled from bottom to top; when the riser needs to float up, the ballast chambers of the pipe sections are sequentially drained from top to bottom; by water-filling or draining the ballast chambers, the floating height of the riser can be adjusted, the riser can be conveniently connected to the pipe-ship connecting device of the mother ship, and the riser can be controlled to sink to the bottom or float out of the sea surface after being separated from the mother ship. In addition, the ballast pipe section is arranged at the lower part of the riser, so that the center of gravity of the riser is lowered, and the riser maintains an upright posture under water.

[0024] Before the invention's ballast pipe section is launched, the ballast tank is filled with water, and the ballast pipe section and the buoyancy pipe section are sequentially connected to form a lifting riser, and finally connected with the upper pipe ship connecting device of the mother ship. On the one hand, during the sequential connection of the ballast pipe section and the buoyancy pipe section in the lifting riser, the inherent vibration frequency of the lifting riser during the pipe section assembly into water process can be changed in time by adjusting the ballast water in the ballast tank, so as to effectively avoid the resonance frequency range of the pipe section of the lifting riser during the assembly process, and to create conditions for the pipe section assembly of the lifting riser into water. On the other hand, the empty ballast tank of the ballast pipe section is avoided to be launched, and when the water is injected under the sea, the air in the ballast tank cannot be effectively discharged outside the ballast tank, so as to effectively improve the utilization rate of the ballast tank.

[0025] The invention realizes the safe protection of the cable by the ballast tank and the buoyancy tank by sealing the cable through the flange surface of the ballast tank and the buoyancy tank through the watertight socket arranged on the flange surface of the ballast tank and the buoyancy tank. In order to improve the connection accuracy of the upper pipe section and the lower pipe section, and to protect the watertight socket, two positioning pins are arranged on the upper flange of the pipe section, and the corresponding positioning holes are arranged on the lower flange.

[0026] The watertight box is arranged to enable the electromagnetic component to work in a dry space, improve the insulation performance of the product, and improve the safety of the product. BRIEF DESCRIPTION OF DRAWINGS

[0027] Figure 1 is a structural schematic diagram of the invention's deep-sea mining lifting riser device;

[0028] Figure 2 is a front view of the invention's buoyancy pipe section 160;

[0029] Figure 3 is a top view of the invention's buoyancy pipe section 160;

[0030] Figure 4 is a front view of the invention's ballast pipe section 260;

[0031] Figure 5 is a front view of the invention's ballast pipe section 260 at the bottom;

[0032] Figure 6 is a schematic diagram of the invention's embodiment 3.

[0033] In the figure: 100, pipe section, 101, watertight socket, 102, upper flange, 103, outer pipe, 104, buoyancy tank, 105, inner pipe, 106, pipe hole, 107, positioning pin hole, 108, protection hole, 109, 110, lower flange, 111, gasket, 112, positioning pin, 114, cable, 115, watertight plug, 116, watertight sensor, 120, bolt hole, 160, buoyancy pipe section, 161, flange gasket;

[0034] 201, water inlet, 202, water outlet, 203, ballast tank, 204, water inlet solenoid valve, 205, water outlet solenoid valve; 211, first water inlet, 212, first water outlet, 213, first ballast tank, 214, first water inlet solenoid valve, 215, first water outlet solenoid valve, 216, first water inlet and outlet, 221, second water inlet, 222, second water outlet, 223, second ballast tank, 224, second water inlet solenoid valve, 225, second water outlet solenoid valve, 226, second water inlet and outlet, 230, watertight box, 231, filter screen, 232, motor, 233, hydraulic pump, 234, one-way valve, 235, water outlet, 236, liquid level sensor, 260, ballast pipe section, 270, anchor. DETAILED DESCRIPTION

[0035] In order to make the objects, technical solutions and advantages of the present application clearer, the following further describes the present application with reference to the accompanying drawings and embodiments:

[0036] Those skilled in the art can understand that unless otherwise defined, all terms (including technical terms and scientific terms) used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs.

[0037] In the present application, the meanings of "left, right, top, bottom, front and back" refer to the front of the paper facing the reader, i.e. the left side of the reader is left, the right side of the reader is right, the top side of the reader is top, the bottom side of the reader is bottom, the front side of the paper facing the reader is front, and the side facing the reader is back, and are not specific limitations of the present application. Figure 1 In the present application, the meaning of "connection" can be direct connection between components or indirect connection between components through other components. For the convenience of description, in the present application, the "pipe section" is the general term of "buoyancy pipe section" and "ballast pipe section".

[0038] Embodiment 1:

[0039] As

[0040] , Figure 1 , Figure 2 , Figure 3 , Figure 4As shown, the deep-sea mining hoisting riser device of the present application is fixedly connected by multiple pipe sections 100. The pipe section 100 is a double-layer pipe, with an inner pipe 105 and an outer pipe 103. The two ends of the pipe section 100 are respectively provided with an upper flange 102 and a lower flange 110. The hollow layer between the inner pipe 105 and the outer pipe 103 and the upper flange 102 and the lower flange 110 are welded to form an annular cabin. The flange surface of the top end and the bottom end of the annular cabin is respectively provided with a flange screw hole 109 penetrating the flange. The flange screw hole 109 on the upper flange 102 is respectively used to install two positioning pins 112 and a watertight socket 101. One end of a cable 114 is connected to the watertight socket 101, and the other end of the cable 114 is connected to a watertight plug 115. Except for the lower flange 110 of the bottom pipe section 100, the lower flanges 110 corresponding to the upper flanges 102 are respectively provided with two positioning pin holes 107 and a protection hole 108 capable of penetrating the watertight socket 101. The watertight socket 101 is protected by the protection hole 108, and the watertight plug can be penetrated out of the protection hole 108. The lower flange 110 of the bottom pipe section 100 is provided with the same as the upper flange 102, such as Figure 5 .

[0041] Before the ballast of the hoisting riser device, the buoyancy in seawater is greater than the weight. At the bottom of the hoisting riser, an anchor 270 is linked by a chain. When the hoisting riser is connected with the mother ship, the anchor 270 is suspended on the lower ballast pipe section 260 and does not contact the seabed. Therefore, when the mother ship needs to move on the sea surface, the anchor 270 does not constrain the mother ship. When the hoisting riser is separated from the mother ship and sinks to the bottom, the anchor 270 sinks into the seabed and constrains the hoisting riser to drift underwater.

[0042] The positioning pins 112 can ensure the positioning accuracy of the connection between the pipe sections 100 and the external equipment. The upper flange 102 of each pipe section 100 is provided with two positioning pins 112, which cooperate with the positioning pin holes 107 on the lower flange 110 of the pipe section 100 above it. In order to avoid positioning errors, the diameters of the two positioning pins 112 are different, and the inner diameters of the positioning pin holes 107 cooperating with them are also different. In order to facilitate installation, the heights of the two positioning pins 112 are also different, one is high and the other is low. In order to avoid the lower flange 110 of the pipe section 100 above colliding with the watertight socket 101 on the upper flange 102 of the pipe section 100 below during pipe section assembly, the height of the lower positioning pin 112 is greater than the height of the watertight socket 101.

[0043] The number and specification of the watertight sockets 101 are determined by the cables 114. In this embodiment, there are two cables, one three-core power cable for the hydraulic pump and one six-core control cable for the electromagnetic valve, so two watertight sockets 101 are provided on the upper flange 102 of each pipe section. More watertight sockets and cables can be provided as needed. The watertight sockets 101 allow the cables 114 to pass through the flange of the pipe section and also provide protection for the cables 114, improving their safety.

[0044] The pipe hole 106 in the pipe section 100 is a channel for transporting ore slurry. To improve its service life, the pipe hole 106 is coated with a high-molecular wear-resistant material. To ensure the sealing between the pipe sections 100, a flange gasket 161 is provided at the connection between the upper and lower pipe sections 100, and a gasket 111 is also provided between the combined surfaces of the positioning pin 112 and the watertight socket 101 and the flange. The upper flange 102 and the lower flange 110 of the pipe section 100 are provided with multiple sets of corresponding bolt holes 120, facilitating the fixed connection of the pipe sections 100.

[0045] As shown in Figure 2 , Figure 4 , if the outer pipe 103 of the pipe section 100 is a closed cylindrical pipe, the pipe section is referred to as a buoyancy pipe section 160, and the annular chamber is identified as a buoyancy chamber 104. If the pipe section 100 is provided with a water inlet 201 and a water outlet 202 on the outer pipe 103 that communicate with the annular chamber, the pipe section is referred to as a ballast pipe section 260, and the annular chamber is identified as a ballast chamber 203. The water inlet 201 of the ballast pipe section 260 is located at the upper part of the ballast chamber 203, and the water outlet 202 is located at the lower part of the ballast chamber 203.

[0046] As shown in Figure 1 , Figure 4 , the ballast pipe section 260 in this embodiment has two sections, namely an upper ballast pipe section and a lower ballast pipe section. For ease of description, the designations of the water inlet 201, the water outlet 202, and the ballast chamber 203 of the ballast pipe section 260 are differentiated Figure 4 between the upper ballast pipe section and the lower ballast pipe section. The water inlet corresponding to the upper ballast pipe section is marked as the first water inlet 211, and similarly, the first water outlet 212, the first ballast chamber 213, the first water inlet electromagnetic valve 214, and the first water outlet electromagnetic valve 215. The water inlet corresponding to the lower ballast pipe section is marked as the second water inlet 221, and similarly, the second water outlet 222, the second ballast chamber 223, the second water inlet electromagnetic valve 224, and the second water outlet electromagnetic valve 225.

[0047] As shown in Figure 1As shown, the water outlet A of the first water filling electromagnetic valve 214 is communicated with the first water filling port 211, the water outlet A of the second water filling electromagnetic valve 224 is communicated with the second water filling port 221, the water inlet P of the first water filling electromagnetic valve 214 is communicated with the water inlet P of the second water filling electromagnetic valve 224, and then communicated with the sea through the filter screen 231. The water inlet P of the first drainage electromagnetic valve 215 is communicated with the first drainage port 212, the water inlet P of the second drainage electromagnetic valve 225 is communicated with the second drainage port 222, the water outlet A of the first drainage electromagnetic valve 215 is communicated with the water outlet A of the second drainage electromagnetic valve 225, and then communicated with the hydraulic pump 233, the one-way valve 234, the drainage port 235 and the sea, and the hydraulic pump 233 is driven by the motor 232. The first water filling electromagnetic valve 214, the first drainage electromagnetic valve 215, the second water filling electromagnetic valve 224, the second drainage electromagnetic valve 225, the hydraulic pump 233, the motor 232 and the one-way valve 234 are installed in the watertight box 230, the watertight box 230 is fixedly connected to the lower part of the riser, and the water inlet P of the second drainage electromagnetic valve 225 and the water inlet of the hydraulic pump 233 are not higher than the second drainage port 222. The watertight box 230 provides a dry space for electromagnetic components, improving the safety of the product.

[0048] Riser sinking and floating:

[0049] 1. Riser sinking: the second water filling electromagnetic valve 224 is powered on and conducted, and the second ballast tank 223 is filled. If the sinking depth of the riser is not enough, the second water filling electromagnetic valve 224 is powered off and closed, the first water filling electromagnetic valve 214 is powered on and conducted, until the sinking requirement is met, and the first water filling electromagnetic valve 214 is powered off and closed.

[0050] 2. Riser floating: the first drainage electromagnetic valve 215 is powered on and conducted, the motor 232 is powered on, and the hydraulic pump 233 drains the ballast water in the first ballast tank 213 through the first drainage port 212-the first drainage electromagnetic valve 215-the hydraulic pump 233-the one-way valve 234-the drainage port 235 into the sea, until the ballast water in the first ballast tank 213 is drained, and the first drainage electromagnetic valve 215 is powered off and closed. If the riser needs to continue to float, the second drainage electromagnetic valve 225 is powered on and conducted, the hydraulic pump 233 drains the ballast water in the second ballast tank 223 through the second drainage port 222-the second drainage electromagnetic valve 225-the hydraulic pump 233-the one-way valve 234-the drainage port 235 into the sea, until the ballast water in the second ballast tank 223 is drained, and the second drainage electromagnetic valve 225 is powered off and closed. The motor 232 is powered off, and the hydraulic pump 233 stops working.

[0051] In addition, in order to effectively avoid resonance generated in the process of assembling and launching the riser, the ballast pipe section 260 fills the ballast tank 203 with water before launching. When resonance occurs in the process of assembling the riser, the ballast tank 203 is emptied or filled with ballast water, the mass of the riser is changed, the natural frequency of the riser is changed, the resonance frequency range generated in the process of assembling and launching the riser is effectively avoided, and the assembling of the riser is facilitated. In addition, the ballast tank is filled with water on land, and the water is discharged underwater, so as to achieve the purpose of vacuumizing the ballast tank 203 underwater and improving the ballast capacity of the ballast tank 203.

[0052] The embodiment further comprises a spare cable of the power line of the hydraulic pump and the control line of the electromagnetic valve and a signal buoy on the mother ship. When the mother ship is separated from the riser device, the water-tight plug of the spare cable is connected to the water-tight socket 101 at the upper end of the riser, the water-tight socket of the spare cable is sealed and fixed to the signal buoy, and then the signal buoy is put into the sea. The beneficial effects are as follows: 1. The signal buoy marks the position of the riser device on the seabed, which facilitates the search for the position of the riser device when the mother ship returns. 2. The water-tight socket of the spare cable can float on the water surface using the signal buoy. When the mother ship returns, the water-tight socket of the spare cable can be connected to the mother ship to control the riser device to float up, so that the riser device is reconnected to the mother ship.

[0053] Embodiment 2

[0054] A marine ore slurry riser system comprises a buoyancy pipe section and a ballast pipe section. The riser comprises at least one buoyancy pipe section, each buoyancy pipe section is provided with a water-tight sensor at the bottom of the buoyancy tank, and the riser comprises at least one ballast pipe section, each ballast pipe section is provided with a liquid level sensor in the height direction of the ballast tank.

[0055] The water-tight sensor is a capacitive sensor.

[0056] The liquid level sensor is a liquid level dry reed sensor.

[0057] The signal cable of the water-tight sensor and the liquid level sensor is connected to the riser through the water-tight socket 101 and the water-tight plug 115, sealed through the flanges on each ballast tank 203 and each buoyancy tank 104, and provided with a water-tight socket at the top of the riser, and connected to the mother ship through the water-tight socket 101.

[0058] The rest is the same as embodiment 1.

[0059] A marine ore slurry lifting riser system, in each section of the buoyancy cabin 104, a watertight sensor 116 is arranged, when the mother ship is working, the watertightness of the buoyancy cabin 104 in each section of the buoyancy pipe section 160 in the lifting riser can be monitored in time, and the safe operation of the deep sea mining lifting riser device is ensured. Because a watertight sensor 116 is arranged in each section of the buoyancy pipe section 160, through the signal transmitted by the watertight sensor 116, it can be judged whether the buoyancy pipe section 160 corresponding to the watertight sensor 116 leaks. Through the arrangement of the watertight sensor 116, not only the sealing of the buoyancy pipe section 160 can be judged, but also the maintenance cycle of the lifting riser can be more scientifically determined under certain experience accumulation.

[0060] In each section of the ballast cabin, a liquid level sensor 236 is arranged, which can monitor the water level of each ballast cabin 203 in the lifting riser on the mother ship; accurately determine whether the lifting riser can sink to the bottom and float up, and improve the management level of safe operation of the system.

[0061] In addition, a spare cable for the watertight sensor 116 and the liquid level sensor 236 signal line is additionally arranged on the mother ship, and is bound together with the above-mentioned signal buoy, so that when the lifting riser sinks and floats, the sealing of each buoyancy pipe section 160 and the water level of each ballast pipe section 260 can be observed on the mother ship through the spare cable, and the floating condition of the lifting riser can be accurately judged.

[0062] Embodiment 3:

[0063] A marine lifting riser that sinks and floats, characterized in that: the lower part of the lifting riser comprises at least one pipe section provided with a water injection and discharge port communicating with an annular cabin on an outer pipe, which is defined as a ballast pipe section, and the annular cabin is defined as a ballast cabin; the water injection and discharge port is provided with a driving member for injecting and discharging ballast water.

[0064] The water injection and discharge port is arranged at the lower part of the ballast pipe section.

[0065] The driving member for injecting ballast water into the ballast cabin is a water injection electromagnetic valve; the water injection electromagnetic valve inlet P is provided with a filter screen and communicates with the sea; the water injection electromagnetic valve outlet A communicates with the ballast cabin water injection and discharge port; the driving member for discharging ballast water from the ballast cabin is a hydraulic pump, the hydraulic pump inlet is provided with a water discharge electromagnetic valve, the water discharge electromagnetic valve inlet P also communicates with the ballast cabin water injection and discharge port, the hydraulic pump outlet is provided with a check valve, and the check valve outlet is provided with a drain port and communicates with the sea; the hydraulic pump is driven by a motor.

[0066] The rest is the same as embodiment 2.

[0067] As Figure 6As shown, in this embodiment, the ballast pipe section 260 has two ballast pipes in total; the water outlet A of the first water injection electromagnetic valve 214 is communicated with the water inlet P of the first water discharge electromagnetic valve 215, and then communicated with the first injection and discharge port 216; the water outlet A of the second water injection electromagnetic valve 224 is communicated with the water inlet P of the second water discharge electromagnetic valve 225, and then communicated with the second injection and discharge port 226; the water inlet P of the first water injection electromagnetic valve 214 is communicated with the water inlet P of the second water injection electromagnetic valve 224, and then communicated with the sea through the filter screen 231; the water outlet A of the first water discharge electromagnetic valve 215 is communicated with the water outlet A of the second water discharge electromagnetic valve 225, and then communicated with the hydraulic pump 233, the one-way valve 234, the water discharge port 235 and the sea, and the hydraulic pump 233 is driven by the motor 232; the water inlet P of the second water discharge electromagnetic valve 225 and the water inlet of the hydraulic pump 233 are not higher than the second injection and discharge port 226.

[0068] In this embodiment, one water injection port 201 and one water discharge port 202 of the ballast pipe section 260 are combined into one injection and discharge port, which is arranged at the lower part of the ballast pipe section 260, so as to facilitate the water discharge of the hydraulic pump; since the water injection and water discharge of the riser cannot be performed at the same time, one water pipe joint is used to complete the sinking and floating of the riser, thereby simplifying the manufacturing of the ballast pipe section 260, and reducing the number of connecting pipes between the ballast pipe section 260 and the watertight box.

Claims

1. A marine slurry riser system, comprising a riser connected to a pipe ship connection device of a mother ship, a watertight box, a motor, a signal buoy; the riser comprises at least two fixedly connected pipe sections, characterized in that: The pipe section is a double-layer sleeve pipe, and the pipe section is provided with flanges at two ends. The hollow layer between the inner layer pipe and the outer layer pipe and the two end flanges are welded to form an annular cabin. The outer layer pipe is a closed cylindrical pipe, and the pipe section is defined as a buoyancy pipe section, and the annular cabin is defined as a buoyancy cabin. The lower part of the riser pipe comprises at least one pipe section provided with a water injection port and a water discharge port in communication with the annular cabin on the outer layer pipe, and the pipe section is defined as a ballast pipe section, and the annular cabin is defined as a ballast cabin. The water injection port and the water discharge port are provided with driving members for injecting and discharging ballast water. The riser pipe comprises at least one buoyancy pipe section. Each buoyancy cabin of each buoyancy pipe section is provided with a watertight sensor at the bottom. The riser pipe comprises at least one ballast pipe section. The ballast cabin of each ballast pipe section is provided with a liquid level sensor in the height direction. The lower part of the riser pipe is further provided with an anchor. The ballast pipe section is provided with a water injection port at the upper part of the ballast cabin and a water discharge port at the lower part of the ballast cabin. The upper and lower flange surfaces of the annular cabin of the bottom pipe section of the riser pipe are provided with watertight sockets, and the upper and lower watertight sockets are connected in correspondence by cables. The upper flange surface of the annular cabin of the riser pipe except the bottom pipe section is provided with a watertight socket, and the lower flange surface is provided with a watertight socket protection hole penetrating the flange in correspondence. One end of the cable is connected with the watertight socket, and the other end of the cable is provided with a watertight plug which penetrates the protection hole of the annular cabin. The watertight socket at the top of the riser pipe is connected with the watertight plug of the power system and the control system of the mother ship in correspondence.

2. A marine slurry riser system according to claim 1, characterized in that: The riser pipe device is in seawater, and the buoyancy of the ballast pipe section before ballasting is greater than the self-weight.

3. A marine slurry riser system according to claim 1, wherein: The driving member for injecting ballast water into the ballast cabin is a water injection electromagnetic valve. The water inlet P of the water injection electromagnetic valve is provided with a filter screen and is connected with the sea. The water outlet A of the water injection electromagnetic valve is connected with the water injection port of the ballast cabin. The driving member for discharging ballast water from the ballast cabin is a hydraulic pump. The water inlet of the hydraulic pump is provided with a water discharge electromagnetic valve, and the water outlet A of the water discharge electromagnetic valve is connected with the water inlet of the hydraulic pump. The water inlet P of the water discharge electromagnetic valve is connected with the water discharge port of the ballast cabin. The water outlet of the hydraulic pump is provided with a one-way valve, and the water outlet of the one-way valve is provided with a water outlet and is connected with the sea. The hydraulic pump is driven by a motor.

4. A marine slurry riser system according to claim 3, wherein: The water injection electromagnetic valve, the hydraulic pump, the motor, the water discharge electromagnetic valve and the one-way valve are arranged in a watertight box. The watertight box is fixedly connected to the lower part of the riser pipe, and the water inlet P of the water discharge electromagnetic valve and the water inlet of the hydraulic pump are not higher than the water discharge port of the ballast pipe section.

5. A marine slurry riser system according to claim 1 or claim 3, characterized by: The cable is the power line of the hydraulic pump and the control line of the electromagnetic valve.

6. A marine slurry riser system as defined in claim 1, wherein: The mother ship is further provided with a set of standby cables of the power line of the hydraulic pump and the control line of the electromagnetic valve. One end of the standby cable is sealed and fixed to a signal buoy, and can be connected with the watertight plug of the power system and the control system of the mother ship in correspondence. The other end of the standby cable is provided with a watertight plug which can be connected with the watertight socket at the upper end of the riser pipe. When the mother ship leaves, the watertight plug of the standby cable of the signal buoy is connected with the watertight socket at the upper end of the riser pipe, the signal buoy floats on the sea surface of the riser pipe, and can timely send position information to the outside.

7. A marine slurry riser system as defined in claim 1, wherein: Two positioning pins are arranged on the upper flange of each pipe section, and corresponding positioning pin holes are arranged on the lower flange. Sealing pads are arranged between the pipe sections.

8. A marine slurry riser system as defined in claim 1, wherein: The water-tight sensor is a capacitive sensor.

9. A marine slurry riser system as defined in claim 1, wherein: The liquid level sensor is a liquid level dry reed sensor.

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