An offshore floating fertilizer production platform

Abstract

The present invention provides an offshore floating fertilizer production platform, which includes a gas purification module (114), an ammonia production module (115), and a fertilizer production module (116) that are sequentially connected on the floating fertilizer production platform (101); an air separation module (111) is connected to the gas purification module (114) to provide a nitrogen source; a seawater desalination module (109) is sequentially connected to an electrolytic hydrogen production module (110) and the gas purification module (114) to provide a hydrogen source; a carbon dioxide capture module (112) is sequentially connected to a carbon dioxide gas storage tank (113) and the fertilizer production module (116) to provide a carbon source. The present invention itself does not emit carbon, and can also capture carbon dioxide as a fertilizer raw material, achieving negative carbon emissions, no pollution, no carbon emissions, sufficient energy, solving the problems of high energy consumption and high pollution in fertilizer production, being not only green and environmentally friendly, but also having a low long-term operation cost.

Description

Technical Field

[0001] The present invention relates to the field of ship and ocean engineering, and more specifically, to an offshore floating fertilizer production platform with carbon capture function. Background Art

[0002] The impact of carbon dioxide in the prior art on the global climate has been increasingly emphasized by the world. Under the guidance of China's dual-carbon policy, especially with the opening of the carbon sink market, ordinary fertilizer production plants are facing double pressures of economy and environmental protection due to high energy consumption and high carbon emissions.

[0003] With the increasing demand for fertilizers in the development of China's agriculture, traditional fertilizer plants are enterprises with high pollution, high energy consumption, and high carbon emissions. Under the background of global environmental protection and carbon reduction, the original three-high model will inevitably be phased out, and the use of environmentally friendly and pollution-free energy is the development trend of future green factories.

[0004] Building a fertilizer production plant on land occupies scarce land resources, with high land use costs. Moreover, due to pollution problems, high costs need to be invested in environmental protection, and environmental impact assessments and other approvals are difficult; in addition, it is difficult to transport large quantities of products produced by onshore fertilizer plants over long distances, and the transportation costs are high. Summary of the Invention

[0005] The present invention provides an offshore floating fertilizer production platform with carbon capture function to solve the problems of high pollution, high energy consumption, high carbon emissions, excessive land resource occupation, high land use costs, and high environmental protection investment costs in existing fertilizer production.

[0006] To achieve the above object, the present invention provides an offshore floating fertilizer production platform, including a gas purification module, an ammonia production module, and a fertilizer production module that are sequentially connected on the floating fertilizer production platform; an air separation module is connected to the gas purification module to provide a nitrogen source; a seawater desalination module is sequentially connected to an electrolytic hydrogen production module and the gas purification module to provide a hydrogen source; a carbon dioxide capture module is sequentially connected to a carbon dioxide gas storage tank and the fertilizer production module to provide a carbon source; a nuclear reaction device for providing electric energy and heat energy is provided at one end inside the cabin of the floating fertilizer production platform and is isolated by an isolation empty cabin;

[0007] The ammonia production module stores the prepared ammonia in the liquid ammonia storage tank therein, and introduces it into the concentrated ammonia water synthesis device through a liquid ammonia pump; then, through the spraying in the reaction tower in the chemical fertilizer production module, the fan blows the carbon dioxide in the carbon dioxide gas storage tank from the bottom of the reaction tower to the top of the tower, reacts with the concentrated ammonia water to generate ammonium bicarbonate solution, and the remaining carbon dioxide re-enters the bottom of the reaction tower through the circulation fan to completely react the carbon dioxide; the ammonium bicarbonate solution flows into the thickener from the bottom of the reaction tower for crystallization and precipitation, and then the ammonium bicarbonate crystals are obtained by centrifugation through a centrifuge, and the ammonium bicarbonate crystals are sent to the chemical fertilizer storage warehouse for storage through a conveyor belt.

[0008] Preferably, a cooling system, a temperature sensor, a pressure sensor and a safety valve are provided in the reaction tower.

[0009] Preferably, the ammonium bicarbonate solution remaining after precipitation in the thickener enters the mother liquor tank for further precipitation separation, and the mother liquor tank is connected to the reaction tower to send the separated ammonia water solution back to the reaction tower; the remaining ammonium bicarbonate solution is then transported back to the thickener for crystallization and precipitation.

[0010] Preferably, the carbon dioxide capture module includes a liquid collection tank filled with a carbon dioxide absorption liquid. The liquid collection tank is provided with an absorption liquid circulation pump to transport the carbon dioxide absorption liquid above the liquid collection tank to make the carbon dioxide absorption liquid flow down naturally, forming several water curtains to absorb CO2 to form MEA rich liquid. The MEA rich liquid is transported to a regeneration tower through a rich liquid pump for a regeneration reaction to release carbon dioxide; then it is transported to the carbon dioxide gas storage tank for storage; after releasing carbon dioxide, the MEA rich liquid is converted into MEA lean liquid, and then returns to the liquid collection tank after being cooled by a lean liquid pump, a rich and lean liquid heat exchanger and a lean liquid cooler connected in sequence.

[0011] Preferably, a number of blowers are correspondingly provided in the liquid collection tank to blow air towards the water curtain to absorb CO2 to form the MEA rich liquid.

[0012] Preferably, the carbon dioxide absorption liquid is monoethanolamine MEA solution.

[0013] Preferably, the regeneration reaction is that the reboiler heats the regeneration tower through the high-temperature steam generated by the nuclear reaction device in the nuclear reaction to decompose the MEA rich liquid and release the carbon dioxide.

[0014] Preferably, the carbon dioxide transport ship is connected to the carbon dioxide gas storage tank through a liquid carbon dioxide storage tank, and a carbon dioxide supply module for vaporizing carbon dioxide is also provided on the liquid carbon dioxide storage tank.

[0015] Preferably, a mooring device is also provided on the deck of the floating chemical fertilizer production platform; the mooring device includes one of a soft yoke single point mooring, an internal turret, an external turret, a CALM type single point or multi-point mooring device.

[0016] Preferably, on the other end of the floating fertilizer production platform away from the nuclear reaction device, there is also an office and living area; and there is also an emergency generator set in the cabin of the floating fertilizer production platform.

[0017] The present invention has the following beneficial effects:

[0018] 1. The present invention not only does not emit carbon itself, but also can capture carbon dioxide in the air and the carbon dioxide to be sequestered transported by the transport ship as raw materials for fertilizer production, achieving negative carbon emissions; other raw materials come from air, seawater, etc., and the raw materials have almost no cost, turning waste into treasure. At present when the carbon sink market is open, it can obtain additional carbon sink income, and the economic benefit is remarkable.

[0019] 2. The present invention uses nuclear energy as the energy source, which is pollution-free, has no carbon emissions, and has sufficient energy, solving the problems of high energy consumption and high pollution of general fertilizer production factories. It is not only green and environmentally friendly, but also has low long-term operation costs.

[0020] 3. China has vast sea area resources. Building the fertilizer production platform at sea not only reduces the occupation of land resources, but also setting the nuclear reactor at sea is convenient for cooling, has high safety, is more acceptable to people, and is easier to be approved.

[0021] 4. The present invention builds the fertilizer production platform at sea, which is conducive to the long-distance sea transportation of a large number of fertilizer products, and the transportation cost is low.

[0022] 5. The present invention has the characteristics of integration and miniaturization, can be flexibly arranged, has a wider application range, and can avoid the impact of platform operation risks on land even far away from land. Description of the Drawings

[0023] Figure 1 is a schematic diagram of the overall structure of the floating platform of the present invention;

[0024] Figure 2 is a flowchart of the operation of the floating platform of the present invention;

[0025] Figure 3 is a flowchart of the carbon dioxide capture system of the present invention;

[0026] Figure 4 is a flowchart of the fertilizer production of the present invention;

[0027] Wherein: 101, floating fertilizer production platform; 102, mooring device; 103, nuclear reaction device; 104, isolation empty tank; 105, nuclear power generation module; 106, power distribution module; 107, carbon dioxide supply module; 108, liquid carbon dioxide storage tank; 109, seawater desalination module; 110, electrolytic hydrogen production module; 111, air separation module; 112, carbon dioxide capture module; 113, carbon dioxide gas storage tank; 114, gas purification module; 115, ammonia production module; 116, fertilizer production module; 117, fertilizer storage bin; 118, office and living area; 119, emergency generator set; 301, liquid collection tank; 302, absorption liquid circulation pump; 303, fan; 304, rich liquid pump; 305, regeneration tower; 306, reboiler; 307, lean liquid pump; 308, rich and lean liquid heat exchanger; 309, lean liquid cooler; 401, liquid ammonia storage tank; 402, liquid ammonia pump; 403, concentrated ammonia water synthesis device; 404, reaction tower; 406, circulation fan; 407, thickener; 408, mother liquor tank; 409, centrifuge; 410, conveyor belt. Detailed implementation manner

[0028] The present invention will be further described below in conjunction with specific embodiments and the drawings.

[0029] The nuclear-powered offshore fertilizer production platform of the present invention includes, but is not limited to, a floating platform.

[0030] As shown in the attached Figure 1-2 As shown, an offshore floating fertilizer production platform includes a gas purification module 114, an ammonia production module 115, and a fertilizer production module 116 that are sequentially connected on a floating fertilizer production platform 101; an air separation module 111 is connected to the gas purification module 114 to provide a nitrogen source; a seawater desalination module 109 is sequentially connected to an electrolytic hydrogen production module 110 and the gas purification module 114 to provide a hydrogen source; a carbon dioxide capture module 112 is sequentially connected to a carbon dioxide gas storage tank 113 and the fertilizer production module 116 to provide a carbon source; a nuclear reaction device 103 that provides electric energy and heat energy is provided at one end inside the cabin of the floating fertilizer production platform 101 and is isolated by an isolation empty tank 104;

[0031] The ammonia production module 115 stores the prepared ammonia in the liquid ammonia storage tank 401 therein, and introduces it into the concentrated ammonia water synthesis device 403 through the liquid ammonia pump 402; then it is sprayed through the reaction tower 404 in the fertilizer production module 116, and the fan blows the carbon dioxide in the carbon dioxide gas storage tank 113 from the bottom of the reaction tower 404 to the top of the tower, reacting with the concentrated ammonia water to generate ammonium bicarbonate solution. The remaining carbon dioxide re-enters the bottom of the reaction tower 404 through the circulation fan 406 to make the carbon dioxide react completely; the ammonium bicarbonate solution flows into the thickener 407 from the bottom of the reaction tower 404 for crystallization and precipitation, and then the ammonium bicarbonate crystals are obtained by centrifugation through the centrifuge 409. The ammonium bicarbonate crystals are sent to the fertilizer storage bin 117 for storage through the conveyor belt 410.

[0032] A cooling system, a temperature sensor, a pressure sensor and a safety valve are provided in the reaction tower 404.

[0033] The ammonium bicarbonate solution remaining after precipitation in the thickener 407 enters the mother liquor tank 408 for further precipitation and separation. The mother liquor tank 408 is connected to the reaction tower 404 to send the separated ammonia water solution back to the reaction tower 404; the remaining ammonium bicarbonate solution is transported back to the thickener 407 for crystallization and precipitation.

[0034] The carbon dioxide capture module 112 includes a liquid collection tank 301 filled with a carbon dioxide absorbent. The liquid collection tank 301 is provided with an absorbent circulation pump 302 to transport the carbon dioxide absorbent above the liquid collection tank 301 to make the carbon dioxide absorbent flow down naturally, forming several water curtains to absorb CO2 to form MEA rich liquid. The MEA rich liquid is transported to the regeneration tower 305 through the rich liquid pump 304 for a regeneration reaction to release carbon dioxide; then it is transported to the carbon dioxide gas storage tank 113 for storage; after releasing carbon dioxide, the MEA rich liquid turns into MEA lean liquid, and then returns to the liquid collection tank 301 after being cooled by the lean liquid pump 307, the rich and lean liquid heat exchanger 308 and the lean liquid cooler 309 connected in sequence.

[0035] A number of blowers are correspondingly provided in the liquid collection tank 301 to blow air towards the water curtain to absorb CO2 to form rich liquid.

[0036] The carbon dioxide absorbent is ethanolamine MEA solution.

[0037] The regeneration reaction is that the reboiler 306 heats the regeneration tower with the high-temperature steam generated by the nuclear reaction of the nuclear reaction device 103, so that the MEA rich liquid is thermally decomposed to release carbon dioxide.

[0038] The carbon dioxide transport ship is connected to the carbon dioxide gas storage tank 113 through the liquid carbon dioxide storage tank 108, and a carbon dioxide supply module 107 for vaporizing carbon dioxide is also provided on the liquid carbon dioxide storage tank 108.

[0039] On the deck of the floating fertilizer production platform 101, there is also a mooring device 102; the mooring device 102 includes one of a soft steel arm single point mooring, an internal turret, an external turret, and a CALM type single or multi-point mooring device.

[0040] At the other end of the floating fertilizer production platform 101 away from the nuclear reaction device 103, there is also an office and living area 118; inside the cabin of the floating fertilizer production platform 101, there is also an emergency power generation set 119.

[0041] Among them, the floating fertilizer production platform 101 is moored in a fixed sea area, and finally produces fertilizer products through various equipment carried on it. The mooring device 102 adopts a soft steel arm single point mooring to moor the floating fertilizer production platform 101 and restrict it to the fixed sea area. The soft steel arm single point mooring has a simple structure, mature technology, and low cost.

[0042] The nuclear reaction device 103 is arranged at one end of the cabin away from the office and living area, and is isolated from other main equipment through an isolation empty cabin 104 to provide energy for the entire platform. An operation space is reserved on the deck above the nuclear reaction device 103. The nuclear reaction device 103 converts the nuclear energy of nuclear fuel into internal energy, the internal energy is converted into mechanical energy by driving a steam turbine, and the mechanical energy is then converted into electrical energy for the platform to use through the nuclear power generation module 105. The internal energy converted from nuclear energy is also used as a heat source for each system on the platform.

[0043] For the nuclear power generation module 105, the power distribution module 106 is responsible for generating electricity using nuclear energy and distributing it to each system on the platform. It is arranged in the cabin below the deck to minimize the corrosion effect of ocean salt spray on the electrical system.

[0044] The carbon dioxide supply module 107 is arranged in the cabin and is responsible for vaporizing the LCO2 in the liquid carbon dioxide storage tank 108 and supplying it as a raw material gas for fertilizer production. The vaporization of LCO2 uses the cooling water whose temperature has risen after cooling the nuclear reactor. Through heat exchange with it, LCO2 absorbs heat and vaporizes, and the cooling water releases heat and cools down, and is reused to cool the nuclear reactor. In this way, the thermal energy of the nuclear reaction device and the cold energy of LCO2 are fully utilized, improving the energy utilization efficiency.

[0045] The liquid carbon dioxide storage tank 108 is arranged in the cabin, below the deck, and the tank type is a C-type tank. The storage tank has a large volume, and the liquid cargo LCO2 is heavy. Utilizing the space below the deck can, on the one hand, make full use of the platform volume to store as much LCO2 as possible, and on the other hand, is beneficial to the stability of the platform. The storage tank is used to store the LCO2 to be processed transported by the carbon dioxide transport ship as a raw material for producing fertilizers.

[0046] The seawater desalination module 109 is installed in the cabin, using the thermal energy of nuclear reaction to efficiently distill seawater. A part of the pure water vapor after distillation is directly supplied to the electrolytic hydrogen production module, and the remaining water vapor is condensed into fresh water and then supplied to the carbon dioxide capture module, the fertilizer production module, etc. for production, and supplied to the living platform for personnel's living use.

[0047] The electrolytic hydrogen production module 110 is installed in the cabin, directly electrolyzing the high-temperature water vapor supplied from the seawater desalination module to generate hydrogen and oxygen. Using the direct electrolysis of water vapor technology saves more than 30% energy compared with electrolyzing water. Not only is it energy-saving, but the electrolysis reaction efficiency is also higher. The hydrogen generated by electrolysis is supplied to the subsequent purification module, and the oxygen can be used as a by-product or directly discharged into the atmosphere.

[0048] The air separation module 111 is installed in the cabin, adopting the deep cryogenic air separation method, using the different boiling points of nitrogen and oxygen in the air to separate nitrogen and oxygen. This method is more suitable for the characteristics of this project with sufficient energy and a large demand for nitrogen. Nitrogen is supplied to the subsequent purification module as the raw material gas for producing fertilizers, and the oxygen can be used as a by-product or directly discharged into the atmosphere.

[0049] The carbon dioxide capture module 112 is installed on the deck. Utilizing the sufficient energy and space on the nuclear power platform, several devices for directly capturing carbon dioxide from the air are set up. Since the concentration of carbon dioxide in the air is very low, the efficiency of various methods for directly capturing carbon dioxide from the air is relatively low. In order to relatively improve the capture efficiency, several fans are used to artificially increase the air circulation volume and blow it towards the water curtain formed by the monoethanolamine (MEA) solution, so that the amount of CO2 absorbed by the solution can be increased with the maximum efficiency. Then, the chemical absorption method is adopted to heat the MEA solution that has absorbed CO2 and release CO2 again, so as to achieve the purpose of enriching CO2. The captured CO2 is used as the raw material gas for subsequent fertilizer production after purification.

[0050] The carbon dioxide gas storage tank 113 is installed on the deck, used to store the carbon dioxide gas captured from the air, and also temporarily store the gas vaporized from the liquid carbon dioxide storage tank for subsequent use in fertilizer production.

[0051] The gas purification module 114 is installed on the deck, mixing the hydrogen produced by the electrolytic hydrogen production module 110 with the nitrogen produced by the air separation module 111, and purifying the mixed gas to remove other gases except hydrogen and nitrogen. On the one hand, this ensures the purity of the final fertilizer product, and on the other hand, it prevents the catalyst used in the subsequent reaction from being poisoned and inactivated due to gas impurities, ensuring the smooth progress of the reaction for producing fertilizers.

[0052] The ammonia production module 115 is installed on the deck. The purified hydrogen-nitrogen mixed gas is introduced into the ammonia production module. Under the reaction conditions of a high temperature of 500 °C and a high pressure of about 30 MPa, and with the action of a fused iron catalyst, ammonia is synthesized. Since this reaction is a reversible reaction, the purity of the ammonia produced from the reactor is not high, usually only about 15%. It is necessary to separate ammonia from the unreacted nitrogen and hydrogen. Utilizing the principle that the boiling point of ammonia is much higher than that of hydrogen and nitrogen, the reaction mixture gas is passed through a condenser to liquefy ammonia, and then the liquid ammonia is separated in a gas separator and introduced into a liquid ammonia storage tank for subsequent use as a raw material in the production of chemical fertilizers; the separated gas, after passing through a recycle compressor, is sent back to the reactor to continuously synthesize ammonia through cyclic reaction with the newly added raw material gas. The chemical equation for the ammonia production reaction is:

[0053] The chemical fertilizer production module 116 is installed on the deck. The liquid ammonia produced by the ammonia production module 115 is mixed with water to synthesize concentrated ammonia water, and then is introduced into a reactor together with CO2. Under the condition of carbon dioxide pressurization, CO2 reacts with concentrated ammonia water to form a suspension of ammonium bicarbonate, which is led out from the bottom of the reactor and cooled, thickened by a thickener to precipitate crystals, and then dehydrated through centrifugation to form ammonium bicarbonate crystals, which is a kind of chemical fertilizer product. The reaction equation is NH3 + CO2 + H2O → NH4HCO3.

[0054] The chemical fertilizer storage bin 117 is installed on the deck and is used for temporarily storing chemical fertilizer products. After reaching a certain quantity, the chemical fertilizer is transported away by a transport ship and sold to various places.

[0055] The office and living area 118 is installed on the deck and is located at the other end of the floating chemical fertilizer production platform 101, far from the nuclear reaction device.

[0056] The emergency power generation set 119 is installed in the cabin. The main equipment is a diesel power generation set, which serves as a temporary power supply means when the nuclear power module fails or needs maintenance.

[0057] The platform also includes necessary equipment and systems such as an internal and external power transmission system, a ballast system, a fire fighting and life-saving system, etc. But it is not limited to the above-mentioned devices and systems.

[0058] As attached Figure 3As shown in the flow chart of the air carbon dioxide capture system of the present invention, since the concentration of carbon dioxide in the air is very low, the present invention innovatively invents a set of air carbon dioxide circulation absorption device, which is composed of a liquid collecting pool 301, an absorption liquid circulation pump 302, and a blower 303. There is monoethanolamine (MEA) solution in the liquid collecting pool 301, which is used to react with CO2 in the air to absorb CO2. The MEA solution is transported above the liquid collecting pool 301 through the absorption liquid circulation pump 302 to form several water curtains. At the same time, several blowers 303 blow air towards the water curtains. This is done by increasing the air flow rate and the surface area of the MEA solution, so that the MEA solution can react with CO2 in the air as much as possible. This set of circulation absorption device circulates continuously, so it can continuously absorb CO2 in the air. When a certain amount of CO2 is absorbed, a rich MEA solution is formed in the liquid collecting pool and is transported to the regeneration tower 305 by the rich liquid pump 304 for CO2 regeneration reaction. High-temperature steam generated by nuclear reaction is introduced into the regeneration tower through the reboiler 306 to heat the regeneration tower. The rich MEA solution will decompose when heated, and the released CO2 comes out from the top of the regeneration tower and is transported to the carbon dioxide gas storage tank 113 for storage as a raw material. After releasing CO2, the rich MEA solution turns into a lean MEA solution, which is transported to the rich and lean liquid heat exchanger 308 by the lean liquid pump 307. Heat exchange will occur between the rich and lean liquids here. After that, after being cooled by the lean liquid cooler 309, the lean liquid will form a water curtain and return to the liquid collecting pool 301 again. In this way, CO2 in the air is continuously captured and stored in the storage tank, and will be used as a raw material when producing chemical fertilizers later.

[0059] As shown in the appendix Figure 4As shown in the fertilizer production flow chart of the present invention, in the ammonia production module 115, the ammonia produced by the ammonia production device is temporarily stored in the liquid ammonia storage tank 401, and is introduced into the concentrated ammonia water synthesis device 403 through the liquid ammonia pump 402. In this device, the liquid ammonia and the fresh water produced by the seawater desalination module are synthesized into concentrated ammonia water with a concentration of 20%. The concentrated ammonia water enters the reaction tower 404 from the top and sprays downward. The fan blows the CO2 in the CO2 gas storage tank 113 from the bottom of the reaction tower 404 to the top, and reacts with the concentrated ammonia water in a countercurrent contact to generate ammonium bicarbonate solution. The unreacted CO2 is re-entered from the bottom of the tower through the circulation fan 406 to ensure that the CO2 can react completely. Since the chemical reaction occurring in the reaction tower 404 will generate heat, a cooling system is configured. At the same time, temperature sensors, pressure sensors and safety valves are provided in the tower to ensure that the reaction temperature and pressure in the tower will not be too high and cause danger. The ammonium bicarbonate suspension generated after the reaction of the concentrated ammonia water and CO2 flows from the bottom of the reaction tower into the thickener 407. The function of the thickener 407 is to further crystallize and precipitate the ammonium bicarbonate suspension. The clearer solution on the upper layer enters the mother liquor tank 408, and the solution is further precipitated and separated in the mother liquor tank 408. The solution on the upper layer is basically ammonia water solution, which is re-transported back to the reactor to react with CO2; the solution containing more ammonium bicarbonate on the lower layer is re-transported back to the thickener 407 for crystallization and precipitation. The crystal precipitate and a small amount of solution at the bottom of the thickener 407 enter the centrifuge 409. The liquid separated by centrifugation enters the mother liquor tank 408, and the solid is ammonium bicarbonate crystal, which is sent to the fertilizer storage bin 117 for temporary storage through the conveyor belt 410.

[0060] The nuclear power on the platform can not only be used for the platform itself, but also the excess electric energy can be exported.

[0061] The floating platform for offshore fertilizer production can also adopt various mooring methods such as soft yoke single point mooring, internal turret, external turret, CALM type single point and multi-point mooring.

[0062] The offshore fertilizer production platform can also adopt a fixed platform; other hydrogen production methods such as pyrolysis hydrogen production can be adopted for the hydrogen production module.

[0063] The carbon dioxide generated by the carbon dioxide capture module can be directly transported to the purification module and used for fertilizer production, or can be stored in the carbon dioxide gas storage tank.

[0064] The external carbon dioxide source can be in various states such as liquid, gaseous, supercritical state, etc.

[0065] The layout of each module on the platform can be flexibly arranged according to the platform space.

[0066] In addition to the distillation method, the seawater desalination system can also adopt the reverse osmosis method to prepare fresh water.

[0067] As described above, it is only the preferred specific embodiment of the present invention, but the protection scope of the present invention is not limited thereto. Any person skilled in the art within the technical scope disclosed by the present invention, according to the technical solution and inventive concept of the present invention, makes equivalent substitutions or changes, and should be covered within the protection scope of the present invention.

Claims

1. An offshore floating fertilizer production platform, characterized in that, It includes a gas purification module (114), an ammonia production module (115), and a chemical fertilizer production module (116) that are sequentially connected on a floating chemical fertilizer production platform (101). An air separation module (111) is connected to the gas purification module (114) to provide a nitrogen source. A seawater desalination module (109) is sequentially connected to an electrolytic hydrogen production module (110) and the gas purification module (114) to provide a hydrogen source. A carbon dioxide capture module (112) is sequentially connected to a carbon dioxide gas storage tank (113) and the chemical fertilizer production module (116) to provide a carbon source. At one end inside the cabin of the floating chemical fertilizer production platform (101), there is a nuclear reaction device (103) that provides electric energy and heat energy, and it is isolated by an isolation empty cabin (104). The ammonia production module (115) stores the prepared ammonia in a liquid ammonia storage tank (401) provided therein, and introduces it into a concentrated ammonia water synthesis device (403) through a liquid ammonia pump (402); then it is sprayed through a reaction tower (404) in the chemical fertilizer production module (116), and a fan blows the carbon dioxide in the carbon dioxide gas storage tank (113) from the bottom of the reaction tower (404) to the top of the tower to react with the concentrated ammonia water to form an ammonium bicarbonate solution. The remaining carbon dioxide re-enters the bottom of the reaction tower (404) through a circulation fan (406) to make the carbon dioxide react completely; the ammonium bicarbonate solution flows into a thickener (407) from the bottom of the reaction tower (404) for crystallization and precipitation, and then ammonium bicarbonate crystals are obtained by centrifugation through a centrifuge (409). The ammonium bicarbonate crystals are sent to a chemical fertilizer storage bin (117) for storage through a conveyor belt (410). The carbon dioxide capture module (112) includes a liquid collection pool (301) filled with a carbon dioxide absorption liquid. The liquid collection pool (301) is provided with an absorption liquid circulation pump (302) to transport the carbon dioxide absorption liquid above the liquid collection pool (301) to make the carbon dioxide absorption liquid flow down naturally, forming several water curtains to absorb CO2 to form MEA rich liquid. The MEA rich liquid is transported to a regeneration tower (305) through a rich liquid pump (304) for a regeneration reaction to release carbon dioxide; then it is transported to the carbon dioxide gas storage tank (113) for storage; after releasing carbon dioxide, the MEA rich liquid turns into MEA lean liquid, and then it returns to the liquid collection pool (301) after being cooled by a lean liquid pump (307), a rich and lean liquid heat exchanger (308), and a lean liquid cooler (309) connected in sequence. Corresponding to the liquid collection pool (301), several blowers are provided to blow air towards the water curtain to absorb CO2 to form the MEA rich liquid.

2. The offshore floating fertilizer production platform according to claim 1, wherein The reaction tower (404) is provided with a cooling system, a temperature sensor, a pressure sensor, and a safety valve.

3. The offshore floating fertilizer production platform according to claim 1, characterized in that, The ammonium bicarbonate solution remaining after precipitation in the thickener (407) enters a mother liquor tank (408) for further precipitation and separation. The mother liquor tank (408) is connected to the reaction tower (404) to send the separated ammonia water solution back to the reaction tower (404); the remaining ammonium bicarbonate solution is transported back to the thickener (407) for crystallization and precipitation.

4. The offshore floating fertilizer production platform according to claim 1, characterized in that, The carbon dioxide absorption liquid is ethanolamine MEA solution.

5. The offshore floating fertilizer production platform according to claim 1, characterized in that, The regeneration reaction is that the reboiler (306) heats the regeneration tower (305) with the steam generated by the nuclear reaction of the nuclear reaction device (103), causing the MEA rich liquid to decompose by heating and releasing carbon dioxide.

6. The offshore floating fertilizer production platform according to claim 1, wherein The carbon dioxide carrier is connected to the carbon dioxide gas storage tank (113) through the liquid carbon dioxide storage tank (108), and a carbon dioxide supply module (107) for vaporizing carbon dioxide is also provided on the liquid carbon dioxide storage tank (108).

7. The offshore floating fertilizer production platform according to claim 1, characterized in that, A mooring device (102) is also provided on the deck of the floating fertilizer production platform (101); the mooring device (102) includes one of a soft yoke single point mooring, an internal turret, an external turret, a CALM type single point or multi-point mooring device.

8. The offshore floating fertilizer production platform according to claim 1, wherein, An office and living area (118) is also provided at the other end of the floating fertilizer production platform (101) far from the nuclear reaction device (103); an emergency generator set (119) is also provided in the cabin of the floating fertilizer production platform (101).

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