Mobile injection device and mobile injection method for solidifying carbon dioxide on the seabed

Abstract

The present invention relates to a mobile injection device and a mobile injection method for solidifying carbon dioxide on the seabed, wherein the mobile injection device for solidifying carbon dioxide on the seabed comprises a ship, a CO2 storage tank, a CO2 cooler, a CO2 pump, a depth control system, and a CO2 monitoring system are arranged on the ship, a reel is arranged in the depth control room, one end of a steel wire rope is fixed on the reel, and the other end of the steel wire rope is fixed on a flexible hose, and the depth controller is connected to a sonar depth sounder through a cable; a monitoring controller is arranged in the CO2 monitoring room, and the monitoring controller is connected to a CO2 detector through a retractable cable; a CO2 injection head comprises an injection shell, an injection cavity, an injection nozzle, a buffer plate, a stirring motor, and an inhibitor container, an annular buffer plate is arranged outside the injection shell, the buffer plate is located above the injection nozzle, a stirring paddle is arranged in the injection cavity, an inhibitor container is arranged on the top of the injection shell, and a liquid level sensor is arranged at the bottom of the inhibitor container. The present invention has low cost for sealing CO2.

Description

Technical Field

[0001] The present invention relates to solid carbon dioxide (CO 2 ) is a technology for depositing carbon dioxide on the seabed for seabed storage, specifically involving a mobile injection device and a mobile injection method for solidifying carbon dioxide on the seabed. Background Art

[0002] Industrial activities such as the burning of fossil fuels increase CO 2 Gas emissions, this human factor caused CO 2 The increase in gas content is slowly changing the natural development trend of the earth's climate and has become the main cause of global warming. Global warming will cause the melting of polar icebergs or ice caps, thereby triggering a series of catastrophic problems such as rising sea levels and species extinction.

[0003] Carbon capture technology uses various methods to capture carbon dioxide from factory exhaust gas, and then properly treats or stores it to prevent it from entering the atmosphere. Seabed storage of carbon dioxide is one of the important ways to achieve carbon dioxide emission reduction. The offshore seabed geological structure is suitable for large-scale storage, and the key emission reduction areas and industries are densely distributed in coastal cities, which is an ideal place to store CO2. 2 CO 2 The construction and operation costs of submarine geological storage are high. The conventional method to reduce costs is to use existing oil and gas exploration data and equipment for site selection and engineering design of carbon dioxide storage. By appropriately modifying existing platforms, drilling rigs, pipelines and other equipment for carbon dioxide transportation and storage, the infrastructure costs of offshore storage can be significantly reduced and the construction period can be shortened.

[0004] The CCUS process typically involves injecting CO into depleted oil and gas reservoirs. 2 The common advantage of these processes is that they have high efficiency due to their high injection capacity into high permeability reservoirs, but the common disadvantage is the risk of CO2 leakage through the wellbore. 2 Risk of leakage, CO 2 It is usually injected into the cold seafloor waters in liquid form. 2 Injection cases include the Sleipnir project in the Norwegian Sea, which started in 1996, the Hokkaido project, which started in 2016, and projects in other areas. Computer simulation studies have shown that geological CO 2 The probability of a leak from the reservoir is very low. A common problem with injecting CO2 into subsea waters is the low injection capacity of the injection wells.

[0005] In summary, there is an urgent need for a new device to solidify carbon dioxide on the seabed to reduce CO 2Minimize the impact on the environment while keeping the storage cost to a minimum. Summary of the invention

[0006] One object of the present invention is to provide a mobile injection device for solidifying carbon dioxide on the seabed. This mobile injection device for solidifying carbon dioxide on the seabed is used to solve the problems of low injection capacity and high cost of injection wells when injecting carbon dioxide into seabed waters; another object of the present invention is to provide a mobile injection method for this mobile injection device for solidifying carbon dioxide on the seabed.

[0007] The technical solution adopted by the present invention to solve the technical problem is: the mobile injection device for solidifying carbon dioxide on the seabed comprises a ship, a CO 2 Storage tank, CO 2 Cooler, CO 2 Pumps, depth control systems, CO 2 Monitoring system, CO 2 Storage tank, CO 2 Cooler, CO 2 The pumps are connected in sequence, CO 2 The pump is connected to the CO via a flexible hose 2 The depth control system includes a depth control room, where a drum is installed. One end of the wire rope is fixed on the drum, and the other end of the wire rope is fixed on the flexible hose. The drum is connected to the winch motor. The depth controller in the depth control room is connected to the sonar depth sounder through a cable. The CO is controlled by retracting and releasing the wire rope. 2 The depth of the jet head lowered into the seawater is adjusted in real time to 2 The injection head is positioned so that it is close to the seafloor; CO 2 Monitoring systems include CO 2 Monitoring room, CO 2 The monitoring room is equipped with a monitoring controller, which is connected to the CO via a retractable cable. 2 The detector controls the CO in real time by controlling the cable retraction and extension 2 The detector is lowered into the seawater to monitor the depth of ocean CO in real time. 2 Concentration; CO 2 The injection head includes an injection shell, an injection chamber, an injection nozzle, a buffer plate, a stirring motor, and an inhibitor container. An annular buffer plate is arranged outside the injection shell, the buffer plate is located above the injection nozzle and covers the injection nozzle underneath, a stirring paddle is arranged in the injection chamber, an inhibitor container is arranged on the top of the injection shell, a liquid level sensor is arranged at the bottom of the inhibitor container, a hydrate inhibitor is filled in the inhibitor container, the inhibitor container is connected to the inhibitor inlet on the top of the injection shell, a second one-way valve and a second flowmeter are installed at the inhibitor inlet, and a temperature and pressure sensor is also installed on the injection shell.

[0008] In the above scheme, the stirring paddle is connected to the variable frequency motor, and the variable frequency motor is arranged on the top of the injection shell.

[0009] In the above solution, a first one-way valve is arranged on the top of the injection shell, the end of the flexible hose is connected to the first one-way valve, and the end of the flexible hose is installed with a first flow meter.

[0010] In the above scheme, CO 2 The inlet of the tank is connected to the CO 2 Connecting device, through CO 2 Connect the device to the CO 2 Storage in CO 2 In storage tank.

[0011] The mobile injection method of the mobile injection device for solidifying carbon dioxide on the seabed:

[0012] When a ship moves in seawater, it emits CO 2 The jet head is placed in the seawater, and the depth control system is used to adjust the CO in the seawater through the wire rope. 2 The depth of the injection head is lowered, and the CO 2 The detector is placed into seawater;

[0013] CO 2 Through CO 2 The cooler is pressurized and encrypted to make the carbon dioxide reach a supercritical state, so that the ship is loaded with high-density liquid CO 2 , CO after cooling 2 By CO 2 Pump into flexible hose, CO 2 Transmitted to the seafloor through a flexible hose, the CO 2 The jet head expands and sprays out through the jet nozzle, immediately forming CO on the seabed 2 Hydrate, CO2 without hydrate 2 Hydrates will form under the buffer plate; when the ship moves, the depth control room receives seawater depth data and adjusts the CO 2 The injection head is positioned close to the seafloor, while the CO 2 The monitoring room receives seawater CO 2 Concentration data, when free CO is detected 2 When 2 The pump controller sends a signal to control the CO 2 Injection rate; CO formed 2 Hydrates are held on the seafloor because their density is higher than that of seawater, enabling CO 2 Seabed storage;

[0014] CO 2 The variable frequency motor of the injection head drives the stirring paddle to stir the CO 2The spray head is always uniformly dispersed in liquid CO 2 , to prevent CO 2 Liquid in CO 2 A large amount of hydrates are accumulated in the injection head;

[0015] Temperature and pressure sensors collect CO 2 The pressure and temperature of the injection head determine the current need to transport liquid CO based on the hydrate formation conditions. 2 The rate at which hydrate blocks CO 2 When the injection head is opened, the injection of hydrate inhibitor is controlled by the second one-way valve and the second flowmeter to prevent and control hydrate or to unblock it. The liquid level sensor of the inhibitor container detects that the hydrate inhibitor is too little and replenishes the inhibitor in time.

[0016] In the above scheme, a buffer plate is used to cover the free CO 2 , so that the free CO that does not immediately form hydrates 2 More time to convert to CO 2 Hydrate. Beneficial Effects

[0017] 1. The present invention stores CO 2 Low cost, no drilling required, CO 2 Direct deposition to the seafloor at a high rate eliminates the expensive and cumbersome drilling process, the cost of discharging carbon dioxide to the seafloor through hoses, and the extremely expensive construction of pipelines for carbon dioxide transportation at locations relatively far from the coast. Movement by ship can accommodate carbon dioxide emission sites relatively far from the coast, avoiding the high cost of laying pipelines during the carbon dioxide transportation process.

[0018] 2. This process is environmentally friendly. The carbon dioxide flow will not penetrate the seabed, which may cause geological disasters to the seabed environment in areas where natural gas hydrates are deposited. CO is efficiently generated at a commercial rate. 2 Hydrate. Generate CO while ensuring safety 2 Hydrates can be deposited on the seabed without causing environmental problems.

[0019] 3. The present invention uses the nozzle to create a local cooling area in the injection head part to reduce the ambient temperature to a temperature far below the temperature at which carbon dioxide hydrates form. In addition, the nozzle will also enhance the mixing speed of carbon dioxide, seawater and seabed sand, accelerating the formation of hydrates. 2 It rises to the buffer plate to form hydrate.

[0020] 4. The present invention uses the data of the sonar depth sounder to control CO 2The depth control room receives the sea depth data from the sonar depth sounder and adjusts the position of the jet head according to the data, so that the jet head is close to the seabed for CO 2 Archive.

[0021] 5. The present invention utilizes CO 2 Data control of the detector CO 2 Injection rate, when CO 2 Using Ultrasonic Tomography to Locate and Characterize CO Leaks 2 , changes caused by leakage, leakage monitoring of risk areas, and detection of seawater CO 2 Adjust the injection rate according to the content and pH value.

[0022] 6. The flow meter of the present invention shows liquid CO 2 The injection flow rate is used to obtain the pressure and temperature of the nozzle through the temperature and pressure sensor, and the liquid CO that needs to be transported is determined based on the hydrate formation conditions. 2 rate, achieving rapid formation of hydrates.

[0023] 7. Liquid CO of the present invention 2 The agitator paddles in the nozzle stir and disperse the hydrates, and the nozzle sprays and expands the hydrates, which effectively prevents the hydrates from adhering to the nozzle and causing blockage. In addition, the present invention provides a hydrate inhibitor container, and controls the injection of the hydrate inhibitor into the nozzle when necessary to prevent and control hydrates or unblock them, thereby ensuring the normal operation of the device of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 It is a simplified phase diagram including hydrate-water-gas;

[0025] Figure 2 It is a schematic diagram of the device of the present invention;

[0026] Figure 3 CO in the present invention 2 Storage tank, CO 2 Cooler, CO 2 Schematic diagram of the connection relationship between the pump and the flexible hose;

[0027] Figure 4 is a schematic diagram of a depth control system of the present invention;

[0028] Figure 5 CO of the present invention 2 Schematic diagram of the monitoring system;

[0029] Figure 6 CO of the present invention 2 Schematic diagram of the injection head.

[0030] In the picture: 1. Ship 2. CO 2 Connector 3.CO2 Tank 4.CO 2 Cooler 5.CO 2 Pump 6. Flexible hose 7. CO 2 Injection head 8. Injection nozzle 9. Buffer plate 10. Depth control chamber 11. Sonar depth sounder 12. CO 2 Monitoring Room 13.CO 2 Detector 14.CO 2 Hydrate 15-1. First flow meter 15-2. Second flow meter 16-1. First one-way valve 16-2. Second one-way valve 17. Frequency conversion motor 18. Stirring paddle 19. Hydrate inhibitor 20. Temperature and pressure sensor 21. Liquid level sensor. DETAILED DESCRIPTION

[0031] The present invention will be further described below in conjunction with the accompanying drawings:

[0032] Combination Figure 2-Figure 6 As shown, the mobile injection device for solidifying carbon dioxide on the seabed includes a ship, a CO 2 Storage tank, CO 2 Cooler, CO 2 Pumps, depth control systems, CO 2 Monitoring system, CO 2 The inlet of the tank is connected to the CO 2 Connecting device, through CO 2 Connect the device to the CO 2 Transport and storage to CO 2 In the tank. 2 Storage tank, CO 2 Cooler, CO 2 The pumps are connected in sequence, CO 2 The pump is connected to the CO via a flexible hose 2 The depth control system includes a depth control room, where a drum is installed. One end of the wire rope is fixed on the drum, and the other end of the wire rope is fixed on the flexible hose. The drum is connected to the winch motor. The depth controller in the depth control room is connected to the sonar depth sounder through a cable. The CO is controlled by retracting and releasing the wire rope. 2 The depth of the jet head lowered into the seawater is adjusted in real time to 2 The injection head is positioned so that it is close to the seafloor; CO 2 Monitoring systems include CO 2 Monitoring room, CO 2 The monitoring room is equipped with a monitoring controller, which is connected to the CO via a retractable cable. 2 The detector controls the CO in real time by controlling the cable retraction and extension 2 The detector is lowered into the seawater to monitor the depth of ocean CO in real time.2 Concentration; CO 2 The injection head includes an injection shell, an injection chamber, an injection nozzle, a buffer plate, a stirring motor, and an inhibitor container. An annular buffer plate is arranged outside the injection shell, the buffer plate is located above the injection nozzle and covers the injection nozzle below, a stirring paddle is arranged in the injection chamber, the stirring paddle is connected to the frequency conversion motor, the frequency conversion motor is a micro deep-sea waterproof motor, and the frequency conversion motor is arranged on the top of the injection shell. An inhibitor container is arranged on the top of the injection shell, a liquid level sensor is arranged at the bottom of the inhibitor container, a hydrate inhibitor is filled in the inhibitor container, the inhibitor container is connected to the inhibitor inlet on the top of the injection shell, a second one-way valve and a second flowmeter are installed at the inhibitor inlet, and a temperature and pressure sensor is also installed on the injection shell; a first one-way valve is arranged on the top of the injection shell, the end of the flexible hose is connected to the first one-way valve, and the end of the flexible hose is installed with a first flowmeter.

[0033] Figure 1 The present invention triggers CO 2 Simplified phase diagram for optimal hydrate formation. Equilibrium curves based on public domain data. Under isobaric conditions, seawater and CO 2 Formation of CO 2 Hydrates are affected by cooling. The point above the equilibrium curve depends on the hydrostatic pressure of the in-situ seawater. Under high pressure and low temperature conditions, small gas molecules are fixed in the crystal cage composed of water molecules to form solid hydrates. Figure 1 Phase diagrams for CO2 and natural gas are compared. If seafloor conditions (pressure and temperature) are above the CO2 equilibrium curve, CO2 hydrates are expected to form. The rate of hydrate formation depends on seafloor conditions and the degree of mixing of the gas with seawater. This principle has been verified in previous studies. However, it takes time for CO2 molecules to fully contact water molecules to form hydrates. If CO2 is released directly to the seafloor, the free CO2 will rise because its density is lower than that of water. Even if CO 2 During the rising process, it will dissolve in the sea water and will also have a negative impact on the sea water environment.

[0034] The equipment of the present invention is installed on a ship 1, wherein the CO 2 Through liquid CO 2 Connecting device 2 to CO 2 Tank 3, through CO 2 Cooler 4 cools to increase density, pump CO 2 Pump 5 into flexible hose 6, into CO 2 The spray head 7 can disperse the liquid CO more evenly by driving the stirring paddle 18 through the variable frequency motor 17 inside the spray head. 2 , to prevent CO 2 Liquid gathers in large quantities in the nozzle to form hydrates. Dispersed liquid CO 2The injected CO is fully injected into the seabed through the nozzle 8. Due to the Joule-Thomson cooling effect, the injected CO 2 The flow should be in a super-cold state and immediately form CO with seawater 2 Hydrate. The flow meter shows that the liquid CO 2 The temperature and pressure sensor 20 obtains the pressure and temperature of the nozzle, and determines the current need to transport liquid CO according to the hydrate formation conditions. 2 The CO is controlled by the first check valve 16-1 and the first flow meter 15-1. 2 The flow rate is used to ensure the hydrate formation rate. When hydrates block the nozzle, the second one-way valve 16-2 and the second flow meter 15-2 are used to control the injection of hydrate inhibitors to prevent and control hydrates or to remove blockages. The inhibitor container is connected to the sensor to ensure timely replenishment of the inhibitor capacity to ensure the normal operation of the device. If a part of the carbon dioxide flow is still free, it should form hydrates under the buffer plate 9. The depth control chamber 10 will receive the readings of the sonar depth sounder 11 and adjust the position of the injection head 7 to keep it close to the seabed. When free CO is detected, 2 When CO 2 Monitoring room 12 receives CO 2 The reading of detector 13 is sent to the CO 2 The pump controller sends a signal to reduce CO 2 Injection rate. The formed CO2 hydrate should remain on the seafloor because of its higher density than seawater.

[0035] See also Figure 3 The ship is mobile and is loaded with a hose from the carrier to the CO 2 Liquid CO in storage tanks 2 The carbon dioxide is pressurized and encrypted by a cooling machine, so that the carbon dioxide reaches a supercritical state, that is, it is converted from gas to liquid. 2 The pump pumps into the hose and into the injection head. Due to the Joule-Thomson effect, CO 2 The gas expands through the porous plug injection nozzle causing a temperature change, forming CO 2 The gas transmission process does not require drilling and the hose cost is low.

[0036] Figure 4 The depth control room receives the seawater depth data from the sonar depth sounder and adjusts the position of the injection head according to the data so that the injection head is close to the seabed for CO 2 Archive.

[0037] Figure 5 CO of the present invention 2 Schematic diagram of the monitoring system. 2Regardless of the form in which the gas is stored in the ocean, there will be some degree of leakage. 2 The release process of CO is extremely slow, but its leakage risk cannot be ignored, including leakage during transportation and injection before sealing. 2 Once leaked, it will first cause ocean acidification, then destroy the balance of the marine ecosystem and threaten the diversity of marine life. 2 Detector detects seawater CO 2 Indicator concentration, pH value and other parameters, these parameters will be accompanied by CO 2 The leakage changes synchronously, and the detector detects the change of indicators and uploads it to the CO 2 Detection chamber, thereby quickly adjusting CO 2 The pumping rate is high to protect the marine environment.

[0038] See also Figure 6 A variable frequency motor 17 is arranged inside the nozzle to drive a stirring paddle 18 to stir and disperse the liquid CO 2 , to prevent CO 2 Liquid gathers in the nozzle to form hydrates, which block the nozzle. 2 The injected CO is fully injected into the seabed through the nozzle 8. Due to the Joule-Thomson cooling effect, the injected CO 2 The flow should be in a super-cold state and immediately form CO with seawater 2 Hydrate. The first flow meter 15-1 shows the flow of liquid CO 2 The temperature and pressure sensor 20 transmits the pressure and temperature data of the nozzle to the CO 2 Monitoring room; CO 2 The monitoring room controls the first check valve 16-1 to control the liquid CO through the hydrate formation conditions. 2 rate to ensure the hydrate formation rate. 2 Hydrate blocked the nozzle, temperature and pressure sensor data were abnormal, CO 2 The monitoring room controls to open the one-way valve 16-2, injects hydrate inhibitor into the nozzle, and performs hydrate prevention and control or unblocking. The liquid level sensor is responsible for transmitting information to the control room to replenish the container inhibitor in time, thereby ensuring the normal operation of the device. If a part of the carbon dioxide flow is still free, it should form hydrates under the buffer plate 9.

[0039] In the present invention, the ship is loaded with CO 2 Carrier or pipeline hose to CO 2 Liquid CO in tank 3 2 Liquid CO 2The carbon dioxide is cooled by the cooler 4 to increase its density. The cooled carbon dioxide is pumped into the hose 6 by the pump 5 and enters the injection head 7. The carbon dioxide is stirred and dispersed by the stirring paddle and expands through the injection nozzle 8. Due to the Joule-Thomson cooling effect, the injected CO 2 The flow should be further cooled to below seawater temperature, thereby immediately forming CO 2 Hydrate. If there is excess carbon dioxide, hydrate will form under the buffer plate 9. The depth control room 10 receives the sea depth data from the sonar sounder 11 and adjusts the position of the injection head 7 to make it close to the seabed. 2 Monitoring room 12 receives the information from CO 2 The data of detector 13, when free carbon dioxide is detected, is sent to CO 2 The pump controller sends a signal to reduce CO 2 Injection rate. CO formed 2 Hydrates remain on the seafloor because they are denser than seawater. The ship will proceed slowly as needed.

[0040] The mobile injection method of the mobile injection device for solidifying carbon dioxide on the seabed:

[0041] When a ship moves in seawater, it emits CO 2 The jet head is placed in the seawater, and the depth control system is used to adjust the CO in the seawater through the wire rope. 2 The depth of the injection head is lowered, and the CO 2 The detector is placed into seawater;

[0042] CO 2 Through CO 2 The cooler is pressurized and encrypted to make the carbon dioxide reach a supercritical state, so that the ship is loaded with high-density liquid CO 2 , CO after cooling 2 By CO 2 Pump into flexible hose, CO 2 Transmitted to the seafloor through a flexible hose, the CO 2 The injection head expands and sprays out through the injection nozzle, immediately forming CO 2 Hydrate, CO2 without hydrate 2 Hydrates will form under the buffer plate; when the ship moves, the depth control room receives seawater depth data and adjusts the CO 2 The injection head is positioned close to the seafloor, while the CO 2 The monitoring room receives seawater CO 2 Concentration data, when free CO is detected 2 When 2 The pump controller sends a signal to control the CO 2 Injection rate; CO formed2 Hydrates are held on the seafloor because their density is higher than that of seawater, enabling CO 2 Seabed storage;

[0043] CO 2 The variable frequency motor of the injection head drives the stirring paddle to stir the CO 2 The spray head is always uniformly dispersed in liquid CO 2 , to prevent CO 2 Liquid in CO 2 A large amount of hydrates are accumulated in the injection head;

[0044] Temperature and pressure sensors collect CO 2 The pressure and temperature of the injection head determine the current need to transport liquid CO based on the hydrate formation conditions. 2 The rate at which hydrates block CO 2 When the injection head is opened, the injection of hydrate inhibitor is controlled by the second one-way valve and the second flowmeter to prevent and control hydrate or to unblock it. The liquid level sensor of the inhibitor container detects that the hydrate inhibitor is too little and replenishes the inhibitor in time.

[0045] The present invention can produce CO without drilling. 2 The CO is transmitted to the seabed through a flexible hose. When the ship is moving, the depth control room receives the sea depth data from the sonar depth sounder and adjusts the position and depth of the jet head according to the data. 2 The monitoring room receives the 2 CO detector 2 Concentration data, control CO 2 Injection rate; Cover free CO with buffer plate 2 , so that the free CO that does not immediately form hydrates 2 More time to convert to CO 2 Hydrate; use sonar to collect seabed depth data and adjust the position and depth of the injection head according to the seabed depth data; use CO 2 Probes collect ocean CO 2 Concentration, based on CO 2 Concentration data adjustment CO 2 Pumping rate.

[0046] The flexible hose of the present invention is resistant to tension, corrosion, low temperature and high pressure, CO 2 The injection head is a Φ150mm injection head, the blade diameter of the stirring paddle is 50mm, and the buffer plate is a 300mm×300mm flat plate.

Claims

1. A mobile injection method for solidifying carbon dioxide on the seabed, characterized in that: It includes a mobile injection device for solidifying carbon dioxide on the seabed, and the mobile injection device for solidifying carbon dioxide on the seabed includes a ship, a CO2 storage tank, a CO2 cooler, a CO2 pump, a depth control system, and a CO2 monitoring system are arranged on the ship, the CO2 storage tank, the CO2 cooler, and the CO2 pump are connected in sequence, the CO2 pump is connected to the CO2 injection head through a flexible hose, the depth control system includes a depth control room, a reel is arranged in the depth control room, one end of the steel wire rope is fixed on the reel, and the other end of the steel wire rope is fixed on the flexible hose, the reel is connected to the winch motor, the depth controller in the depth control room is connected to the sonar depth sounder through a cable, the depth of the CO2 injection head lowered into the seawater is controlled by retracting and releasing the steel wire rope, and the position of the CO2 injection head is adjusted in real time to make it close to the seabed; the CO2 monitoring The system includes a CO2 monitoring room, in which a monitoring controller is provided, and the monitoring controller is connected to a CO2 detector through a retractable cable. By controlling the retractable cable, the depth of the CO2 detector lowered into the seawater is controlled in real time, and the CO2 concentration in the ocean is monitored in real time; the CO2 injection head includes an injection shell, an injection chamber, an injection nozzle, a buffer plate, a stirring motor, and an inhibitor container. An annular buffer plate is provided outside the injection shell, the buffer plate is located above the injection nozzle and covers the injection nozzle below, a stirring paddle is provided in the injection chamber, an inhibitor container is provided on the top of the injection shell, a liquid level sensor is provided at the bottom of the inhibitor container, a hydrate inhibitor is contained in the inhibitor container, the inhibitor container is connected to the inhibitor inlet on the top of the injection shell, a second one-way valve and a second flowmeter are installed at the inhibitor inlet, and a temperature and pressure sensor is also installed on the injection shell; When the ship moves in the seawater, the CO2 injection head is placed in the seawater, and then the depth of the CO2 injection head in the seawater is adjusted by the depth control system through the steel wire rope, and the CO2 detector is placed in the seawater at the same time; CO2 is pressurized and encrypted through a CO2 cooler, so that carbon dioxide reaches a supercritical state, so that the ship is loaded with high-density liquid CO2. The cooled CO2 is pumped into a flexible hose by a CO2 pump. CO2 is transmitted to the seabed through the flexible hose, enters the CO2 injection head, and expands and sprays out through the injection nozzle, immediately forming CO2 hydrates on the seabed. CO2 that has not formed hydrates will form hydrates under the buffer plate; when the ship moves, the depth control room receives seawater depth data and adjusts the position of the CO2 injection head in real time to make it close to the seabed. At the same time, the CO2 monitoring room receives seawater CO2 concentration data. When free CO2 is detected, a signal is sent to the CO2 pump controller to control the CO2 injection rate; the formed CO2 hydrates remain on the seabed because their density is higher than that of seawater, realizing the seabed storage of CO2; The variable frequency motor of the CO2 injection head drives the stirring paddle to stir, so that the liquid CO2 is always evenly dispersed in the CO2 injection head, preventing the CO2 liquid from aggregating in large quantities in the CO2 injection head to form hydrates; The temperature and pressure sensor collects the pressure and temperature of the CO2 injection head, and determines the current rate of liquid CO2 delivery based on the hydrate formation conditions. When hydrates block the CO2 injection head, the injection of hydrate inhibitor is controlled through the second one-way valve and the second flowmeter to prevent and control hydrates or unblock them. The inhibitor container liquid level sensor detects that the hydrate inhibitor is too little and replenishes the inhibitor in time.

2. The mobile injection method for solidifying carbon dioxide on the seabed according to claim 1, characterized in that: The stirring paddle is connected to a variable frequency motor, and the variable frequency motor is arranged on the top of the injection shell.

3. The mobile injection method for solidifying carbon dioxide on the seabed according to claim 2, characterized in that: A first one-way valve is arranged on the top of the injection shell, the end of the flexible hose is connected to the first one-way valve, and the end of the flexible hose is installed with a first flow meter.

4. The mobile injection method for solidifying carbon dioxide on the seabed according to claim 3, characterized in that: The inlet of the CO2 storage tank is connected to the CO2 connecting device, and the CO2 is stored in the CO2 storage tank through the CO2 connecting device.

5. The mobile injection method for solidifying carbon dioxide on the seabed according to claim 4, characterized in that: Covering the free CO2 with a buffer plate allows the free CO2 that does not immediately form hydrates to have more time to be converted into CO2 hydrates.

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