Intensive modular offshore floating ammonia synthesis system and configuration method thereof

Abstract

The invention discloses an intensive modular offshore floating type ammonia synthesis system and a configuration method thereof, and relates to the technical field of sea area wind power generation, the ammonia synthesis system is intensively formed by multiple sets of offshore floating type ammonia synthesis subsystems which are connected in parallel, and the multiple sets of subsystems receive raw material gas through a unified gas source supply pipeline; the subsystem is formed by sequentially connecting a plurality of modular parts according to the offshore ammonia production process flow, and each modular part is formed by connecting one or more equipment monomers with the same function in parallel. After the single equipment is miniaturized, the requirements of the offshore platform on the height and the unit area quality can be met, the ammonia synthesis device can reach the production index and realize the dynamic adjustment of the productivity under the condition of offshore wind power output fluctuation, and the safety of the production process is ensured.

Description

Technical Field

[0001] The present invention relates to the technical field of offshore wind power generation, and particularly relates to an intensive modular offshore floating ammonia synthesis system and a configuration method thereof. Background Art

[0002] The advancement of deep - sea and far - sea wind power generation faces dual challenges. On the one hand, technical problems urgently need to be overcome, and on the other hand, the high economic cost undoubtedly becomes a significant obstacle to the development of the offshore wind power industry. At the same time, in the process of using renewable energy to produce hydrogen and then manufacture green methanol or synthetic ammonia, the cost of the hydrogen transportation link is high and the risk is large. In view of this, adopting the scheme of direct ammonia synthesis at sea can effectively reduce production costs and significantly improve transportation efficiency, providing new ideas and paths for the development of related industries. Direct ammonia synthesis at sea can reduce production costs and improve transportation efficiency, but the dynamic response ability of the offshore wind power - to - ammonia system has become the core bottleneck restricting industrial application. Traditional synthesis devices are designed based on steady - state operating conditions. When dealing with the ±35% power fluctuation of offshore wind power, the existing gas source buffer devices cannot suppress the raw material fluctuations under surge conditions, resulting in the fluctuation range of the synthesis tower space velocity exceeding the design threshold, directly leading to the ammonia net value dropping below 12%, which is nearly 50% lower than that of land - based systems.

[0003] There are now design methods for offshore platforms and devices available for reference, but there are few intensive and anti - sloshing designs for offshore ammonia synthesis devices. For example, Chinese Patent CN 117383583A discloses a modular ammonia synthesis reactor with adjustable production capacity and its control method. By independently controlling the start - stop of 10 monomer reactors (adjustment range 5% - 110%), it adapts to the fluctuating load of green ammonia production, and uses an electric furnace for auxiliary start - up and reaction heat release to self - sustain the temperature (450°C threshold), with significant energy - saving advantages during low - load operation. However, there is a lack of intensive design, high equipment redundancy, and each reactor is independently equipped with heat exchangers, valves, and sensors, resulting in low space utilization (such as the increased land occupation cost of 10 units) and complex maintenance.

[0004] Chinese Patent CN 219621268U discloses an electrolytic water hydrogen - production and ammonia - synthesis system suitable for offshore wind power with wide power fluctuations. Hydrogen is produced by the parallel connection of an alkaline electrolytic cell (stable power) and a PEM electrolytic cell (low - power fluctuation), and high - pressure hydrogen cylinders and liquid hydrogen storage tanks are combined to compensate for hydrogen supply fluctuations, and the closed - loop circulation of synthetic ammonia (recycling of unreacted nitrogen and hydrogen) is used to reduce storage and transportation costs. Its advantages lie in improving the utilization rate of wind power, the economy of liquid ammonia storage and transportation, and the flexibility of system modular deployment. However, there is insufficient intensification, and multiple electrolytic cells and hierarchical seawater desalination units (independent water supply for alkaline / PEM) lead to equipment redundancy and low space utilization; in addition, the hydrogen compensation system relies on a dual - path of high - pressure cylinders and liquid hydrogen tanks, without sharing storage or desalination facilities, increasing the infrastructure cost.

[0005] Chinese Patent CN 117623330A discloses a renewable energy hydrogen production and ammonia synthesis system for offshore platforms. This system is deployed on fixed or floating offshore platforms and includes core modules such as renewable energy power supply, seawater desalination, water electrolysis for hydrogen production, and air separation for nitrogen production. Hydrogen is produced by electrolyzing pure water after seawater desalination, and nitrogen separated from air is pressurized by a syngas compressor to form syngas, which catalytically generates ammonia-containing gas in the ammonia synthesis system. This invention does not involve intensive design. The dispersion of modules leads to low space utilization. The system includes multiple independent modules such as seawater desalination, water electrolysis for hydrogen production, and air separation for nitrogen production, and does not adopt an integrated layout (such as sharing a pretreatment unit or an energy recovery facility), which is likely to cause equipment redundancy in the limited space of offshore platforms. In addition, this invention does not consider the pretreatment device under the condition of large fluctuations in offshore gas sources.

[0006] Currently, most large ammonia synthesis plants are designed for stable onshore operating environments. These plants usually cover a large area, have a high equipment height, and the dispersion of modules leads to equipment redundancy (such as independent heat exchangers, sensors), complex operation and maintenance, and an increase in infrastructure costs by 30%-50%. Traditional systems rely on reactor start-stop to adjust production capacity (the adjustment range is only 5%-110%), and cannot continuously match the ±35% fluctuations of offshore wind power. When operating at low loads, the reactor temperature is low, and the risk of catalyst deactivation is high. It takes up to several hours for traditional systems to resume production, resulting in large losses from unplanned shutdowns, and they have a weak adaptability to dynamic working conditions and are difficult to fully meet the various limitations faced by offshore platform production.

[0007] Therefore, those skilled in the art are committed to developing a new type of offshore floating ammonia synthesis system and equipment, which can ensure that the ammonia production reaches the expected target while meeting the requirements of unit area weight and height limits. At the same time, the system also needs to be able to flexibly adjust production capacity in the case of fluctuations in offshore wind power output and ensure the safety of the production process. Summary of the Invention

[0008] In view of the above-mentioned defects of the prior art, the technical problem to be solved by the present invention is to address the problems existing in existing land-based large ammonia synthesis plants, such as large floor area, high height and large weight of some monomer equipment (such as reactors and distillation towers), which make it difficult for them to adapt to the space limitations, bearing capacity requirements and dynamic working conditions of offshore platforms. The technical problem that the present invention aims to solve is how to miniaturize the monomer equipment, that is, after meeting the requirements of the height and unit area mass of the offshore platform, while ensuring that the ammonia synthesis plant can reach the production index and achieve dynamic adjustment of production capacity in the case of fluctuations in offshore wind power output, and ensure the safety of the production process. To this end, the present invention proposes an intensive modular offshore floating ammonia synthesis system and equipment configuration plan.

[0009] To achieve the above technical objectives, the present invention discloses an intensive modular offshore floating ammonia synthesis system. The ammonia synthesis system is intensively composed of multiple sets of parallel offshore floating ammonia synthesis subsystems. And multiple sets of the subsystems receive raw material gas through a unified gas source supply pipeline and output synthesized ammonia through a summary pipeline. The subsystem is connected in sequence according to the offshore ammonia production process by multiple modular components combined in series and parallel. The modular component is composed of one or more device monomers with the same function connected in parallel.

[0010] In a preferred embodiment of the present invention, the hydrogen in the raw material gas is obtained by electrolyzing water through offshore wind power generation.

[0011] In a preferred embodiment of the present invention, the modular component includes: a renewable energy power supply system, a seawater desalination system, an electrolytic water hydrogen production system, an air separation nitrogen production system, a syngas compressor device, a recycle gas compressor device, an ammonia synthesis system, an ammonia separation system, a heating system, and a waste heat recovery system.

[0012] In a preferred embodiment of the present invention, the maximum production capacities among multiple sets of the subsystems are different and there are differences. The production capacities are E1, E2, E3,..., E N , and the production capacities satisfy E i > E i+1 > E i ×50%.

[0013] In a preferred embodiment of the present invention, the production capacity of the subsystem is adjusted by controlling the opening degree of the control valve group. The adjustment range of the production capacity of the subsystem is 50% - 100%, and the production capacity can be reduced to 0 by stopping.

[0014] The present invention also discloses a configuration method for the intensive modular offshore floating ammonia synthesis system as described above, including the following steps:

[0015] S61: Determine the total production capacity Q, the minimum production capacity Q min and the target production capacity Q max ;

[0016] S62: Based on the minimum production capacity Q min , select subsystems. Mark the production capacities of the selected M sets of subsystems as C1, C2, C3,..., C M . The number of selected subsystem sets M should satisfy formula (2):

[0017] M ≤ N (2)

[0018] where N is the total number of subsystem sets;

[0019] S63: Calculate the total production capacity of the selected M subsystems using equations (3) and (4), and the production capacity of the selected M subsystems should satisfy that the adjustable range completely covers the total production capacity range Q min to Q max , as shown in equation (5):

[0020]

[0021] a i ∈[0]∪[0.5,1] (4)

[0022]

[0023] In a preferred embodiment of the present invention, in step (1), the relationship between Q and Q min , Q and Q max is as shown in equation (1):

[0024]

[0025] In a preferred embodiment of the present invention, it specifically includes the following steps:

[0026] S81: Select the first set of subsystems. The production capacity C1 of the selected subsystem should satisfy that 50% of its production capacity is less than Q min , and the absolute value of the difference between 50% of its production capacity and Q min is the smallest among all subsystems. The relationship between C1 and Q min is as shown in equation (6):

[0027]

[0028] S82: If the production capacity C1 is greater than or equal to Q max , then output the selection plan; if the production capacity C1 is less than Q max , then select the next set of subsystems until the total production capacity of the selected subsystems is greater than or equal to Q max and then output the selection plan, as shown in equation (7):

[0029]

[0030] and the production capacity C i of the selected subsystems should satisfy equation (8) or (9):

[0031]

[0032] Furthermore, when the number of selected subsystems M = N, that is, all available subsystems are exhausted and the total production capacity is still lower than Q max , it is determined that "there is no feasible selection plan under the current production capacity demand", the process is terminated and an abnormal state is output.

[0033] Further, when the production capacity of all subsystems drops to Q min or below, start the extreme condition response mechanism, including the following steps: First, start the thermal cycle compensation loop, maintain the core temperature of the reactor at ≥180°C, control the energy consumption at 12%-15% of the normal operation, avoid thermal stress damage, adjust the overall equipment to the heat preservation state, and resume the operation of the equipment when there is enough syngas to provide not less than

[0034] Compared with the prior art, the present invention has the following beneficial effects:

[0035] (1) The present invention pioneers the intensive system design of a multi-stage parallel architecture. Through the dynamic combination of N sets of subsystems with different production capacities, an offshore synthesis system with elastic production capacity is constructed. Each subsystem can operate independently or cooperate with each other, and realizes the intensive utilization of resources relying on the unified gas source distribution network and product collection pipeline network. Based on the multi-objective optimization algorithm, the number of subsystems N and the production capacity E of a single set are iteratively matched. On the premise of meeting the area constraint and load limit of the floating platform, the comprehensive benefit index of the system is optimized, effectively solving the problem of equipment redundancy caused by the traditional discrete layout.

[0036] (2) The present invention breaks through and adopts the technical route of "module heterogeneous integration + flexible equipment configuration". A series-parallel composite topological structure is constructed inside the subsystem: the core reaction unit adopts the parallel connection of multiple devices to realize the elastic expansion of production capacity (adjustment range 50%-100%), and the auxiliary unit ensures the process continuity through series connection. This design enables the system to have dual adaptability - physically meeting the requirements of the dynamic load distribution of the floating platform, and realizing stable operation with the production capacity fluctuating between 20% and 120% under the condition of raw material fluctuations at the process level. Through the standardized skid-mounted module integration technology, the land occupation of the traditional onshore system is reduced.

[0037] (3) The present invention innovatively integrates the dynamic intelligent regulation and extreme condition thermal compensation technologies to construct a multi-level safety guarantee system. Through the iterative optimization algorithm built in the dynamic adjustment controller, the gas source fluctuation and equipment status are sensed in real time, and a three-level response strategy of "priority frequency modulation - component shutdown - parking heat preservation" is adopted to achieve precise production capacity matching while maintaining the thermodynamic balance of the synthesis reaction. The specially designed low-temperature thermal cycle compensation loop can maintain the core temperature of the reactor at ≥180°C at the cost of 12%-15% of the normal energy consumption under the extreme low load condition, effectively preventing catalyst deactivation and equipment thermal stress damage. This technical breakthrough enables the system to maintain the thermal inertia of the equipment and quickly resume production when encountering severe wind power fluctuations caused by extreme offshore weather, shortening the unplanned downtime by more than 70%, and significantly improving the system robustness and operation continuity in the harsh offshore environment.

[0038] The concept, specific structure and technical effects of the present invention will be further described below in conjunction with the accompanying drawings to fully understand the purpose, features and effects of the present invention. Description of the Drawings

[0039] Figure 1 It is a structural diagram of an intensive modular offshore floating ammonia synthesis system provided by the present invention; in the figure: S1 - the first subsystem; Si - the i-th subsystem; Sj - the j-th subsystem;

[0040] Figure 2 It is a schematic diagram of the connection relationship of modular components of the offshore floating ammonia synthesis subsystem.

[0041] Figure 3 It is a flow chart of the subsystem selection and matching scheme of the present invention. Detailed Embodiments

[0042] The following introduces multiple preferred embodiments of the present invention with reference to the drawings of the specification to make its technical content clearer and easier to understand. The present invention can be embodied in many different forms of embodiments, and the protection scope of the present invention is not limited to the embodiments mentioned in the text.

[0043] With the large-scale development of offshore wind power and its development towards the deep sea, problems such as the increase in wind power consumption and transmission costs have become more prominent. The large-scale hydrogen production from offshore wind power and its comprehensive utilization provide a feasible technical path to solve the above problems. Among them, the synthesis of green ammonia from hydrogen is an effective way to utilize hydrogen energy. At present, there are already concept plans for green ammonia FPSO ship types that have obtained AIP certification from classification societies abroad. In China, systematic research on this type of equipment technology has not been carried out yet, and there is currently no test and application of an offshore floating ammonia production process system. It is necessary to break through the key technologies of the floating green hydrogen to ammonia process system and the development of the integrated utilization platform ship type, and carry out the research and development of key prototypes to lay a technical foundation for future large-scale development and utilization.

[0044] To improve the construction feasibility and flexible transportation of the offshore ammonia production system, the present invention proposes an intensive modular offshore floating ammonia synthesis system and device that meet the load-bearing and space constraints of the offshore floating platform. The offshore floating ammonia synthesis system is intensively composed of N sets of parallel offshore floating ammonia synthesis subsystems. Each set of systems operates independently, and the production capacities of different systems decrease step by step. They are supplied with gas collectively from a unified gas source, and the produced ammonia can also be collected uniformly after being aggregated through pipelines. Among them, the offshore floating ammonia synthesis subsystem is connected in sequence according to the offshore ammonia production process by a plurality of modular components combined in series and parallel. The production capacity of the subsystem is iteratively optimized in combination with the quantity, constraints, and target parameters. The modular component is composed of one or more equipment monomers with the same function connected in parallel. The production capacity of the subsystem is adjusted by controlling the opening degree of the control valve group, combined with a temporary parking protection mechanism and a system joint control strategy, so as to realize the dynamic adjustment of different production capacities of the system and match the unstable fluctuations of the gas source and electricity.

[0045] With the continuous increase in global energy demand and the increasingly strict environmental protection standards, ammonia, as a clean and efficient energy alternative, its market potential is growing continuously. The present invention introduces an integrated and modular offshore floating ammonia synthesis system, which can ensure the safe and stable operation of the offshore floating ammonia synthesis process and provides a solid technical guarantee for ocean energy development. This technology is known for its remarkable innovation and practicality and shows a broad market prospect.

[0046] The following is illustrated by specific examples.

[0047] Example 1

[0048] The structural diagram of the intensive modular offshore floating ammonia synthesis system is intensively composed of N sets (N≥1) of offshore floating ammonia synthesis subsystems arranged in parallel. Each subsystem operates independently, receives raw material gas through a unified gas source supply pipeline, and outputs synthetic ammonia through a summary pipeline. Each subsystem of the synthesis system is connected in sequence according to the offshore ammonia production process by a plurality of modular components combined in series and parallel. The production capacity of the subsystem is determined by the number and performance of the modular components. Among them, the hydrogen in the synthetic raw material gas of the system is obtained by electrolyzing water with offshore wind power. In the case of fluctuations in offshore wind power, the supply of raw material gas to the device will fluctuate to a corresponding extent, and the corresponding distribution to each subsystem will also fluctuate accordingly. When the gas source fluctuation is small, the system maintains the low production capacity operation of each subsystem by controlling the nitrogen-hydrogen ratio of the raw material gas. When the gas source fluctuation continues to increase, the large production capacity modules of the subsystem are gradually shut down to ensure that the remaining subsystems remain in the operating state. When the gas source fluctuation is large, only the low production capacity subsystems are allowed to operate so that the total system maintains low production capacity operation. The control system of the subsystem adopts a control strategy of "prioritizing frequency modulation, followed by component shutdown, and then subsystem shutdown and heat preservation" according to the fluctuation and system distribution conditions to realize the dynamic adjustment process of production capacity under the condition of offshore wind power fluctuation. The gas source fluctuation control value can be adjusted according to the actual situation.

[0049] The internal equipment layout of the modular skid-mounted platform meets the requirements that the bearing capacity per unit area of the platform ≤ X tons per square meter (X is set according to the actual engineering needs), and the total length of the connecting pipelines between the equipment is shortened by 40%-60% compared with the land-based system. The connection relationship of the modular components of the offshore floating ammonia synthesis subsystem is as Figure 2 shown, including: a renewable energy power supply system, a seawater desalination system, an electrolytic water hydrogen production system, an air separation nitrogen production system, a syngas compressor device, a recycle gas compressor device, an ammonia synthesis system, an ammonia separation system, a heating system, and a waste heat recovery system.

[0050] The production capacities between the subsystems arranged in parallel are different from each other and vary greatly. The production indexes (such as conversion rate, purity, etc.) of each subsystem need to be dynamically optimized according to the space constraints and load limitations of the offshore platform. Its process flow and component selection can be flexibly adjusted, but the comprehensive performance of all subsystems must meet the requirements of the total system indexes. The maximum production capacities between the subsystems are different from each other and vary greatly. The production capacities are E1, E2, E3, ……, E N , and the production capacities satisfy E i >E i+1 >E i ×50%. And the production capacity of the subsystem is adjusted by controlling the opening of the control valve group. The adjustment range of the production capacity of the subsystem is 50% - 100%, and the production capacity can be reduced to 0 by stopping.

[0051] As Figure 1As shown in the figure, it is an intensive modular offshore floating ammonia synthesis system provided by the present invention. In this figure, the intensive offshore floating ammonia synthesis system is intensively composed of n sets of parallel offshore floating ammonia synthesis subsystems. Each set of systems operates independently and is collectively supplied with gas from a unified gas source, including raw material gases such as nitrogen and hydrogen. The produced ammonia can also be collected uniformly after being aggregated through pipelines. The parallel devices of the modular components in each subsystem can use devices with the same power and specifications, or devices with different powers and specifications. The design of each subsystem needs to combine the investment and revenue models of offshore chemical plants, and perform iterative optimization on the single-set production capacity M and the number N of production subsystems to minimize the total area, investment cost, and operating cost of the overall device to the greatest extent, or to maximize the revenue of the system, and automatically store the data of the optimization iteration process, including parameters such as total material conservation, system production capacity, power, floor area, weight, equipment layout, and investment cost, to improve the design efficiency, reduce the design cost, and realize the intensive design and application of the offshore green ammonia synthesis system and device.

[0052] Example 2

[0053] A configuration method for an intensive modular offshore floating ammonia synthesis system includes a dynamic adjustment controller. By executing an iterative optimization algorithm, it collaboratively controls the number of operating synthesis reaction devices and the production capacity level of a single device in each subsystem, and monitors the gas source fluctuations caused by offshore wind power, so that the overall production capacity of the system can be continuously adjusted within the range of 20% - 120% of the designed benchmark production capacity. Execute the iterative optimization algorithm. By collaboratively controlling the number of operating synthesis reaction devices and the production capacity level of a single device in each subsystem, the overall production capacity of the system can be continuously adjusted within the range of 20% - 120% of the designed benchmark production capacity Q.

[0054] The total production capacity Q design of the intensive modular offshore floating ammonia synthesis system needs to follow the following principles: On the premise of meeting the target production capacity Q, give priority to using the combination of the fewest subsystems to simplify the system structure. At the same time, the production indexes (such as conversion rate, purity, etc.) of each subsystem need to be dynamically optimized according to the space constraints and load limitations of the offshore platform. Its process flow and component selection can be flexibly adjusted, but the comprehensive performance of all subsystems must meet the requirements of the overall system indexes. By coordinating the production capacity allocation of each subsystem, the final system needs to achieve an adjustable range from the minimum production capacity Q min to the target production capacity Q max Among them, the relationship between Q and Q min , and the relationship between Q and Q max is shown in Equation (1):

[0055]

[0056] Furthermore, based on the minimum production capacity Q min , select and match subsystems, and mark the production capacities of the selected M sets of subsystems as C1, C2, C3,... CM , the production capacities of the selected subsystems vary, and the number of selected subsystem sets M should satisfy Equation (2):

[0057] M ≤ N (2)

[0058] The calculation formula f for the production capacity of the selected M sets of subsystems is shown in Equations (3)-(4):

[0059]

[0060] a i ∈[0] ∪ [0.5, 1] (4)

[0061] The production capacity of the selected M sets of subsystems should satisfy that the adjustable range completely covers the total production capacity range Q min to Q max , that is, as shown in Equation (5):

[0062]

[0063] The specific selection plan is as shown in the appendix Figure 3 :

[0064] First, select the first set of subsystems. The production capacity C1 of the selected subsystem should satisfy that 50% of its production capacity is less than Q min , and the absolute value of the difference between 50% of its production capacity and Q min is the smallest among all subsystems. The relationship between C1 and Q min is shown in Equation (6):

[0065]

[0066] Subsequently, judge according to the relational expression (7). If the production capacity is greater than or equal to Q max , then output the selection plan.

[0067]

[0068] If it is less than Q max , then select the next set of subsystems, and the production capacity C i of the selected subsystem should satisfy the relational expression (8) or (9):

[0069]

[0070] It should be noted that after each new set of subsystems is selected, it is necessary to make a judgment according to the logic of Equation (7). If it is greater than the production capacity Q max , immediately terminate the selection and output the current plan. If the total production capacity is still lower than Q max and the number of selected subsystems M = N (that is, all available subsystems are exhausted), then it is determined that "there is no feasible selection plan under the current production capacity demand", terminate the process and output an abnormal state.

[0071] In special cases, the fluctuations of offshore wind power lead to insufficient synthesis gas production, resulting in a production capacity drop to Q min When it is below, the extreme condition response mechanism is activated. First, the thermal cycle compensation circuit is activated to maintain the core temperature of the reactor at ≥180°C, and the energy consumption is controlled at 12%-15% of the normal operation to avoid thermal stress damage; at this time, the overall equipment is adjusted to the heat preservation state, and when there is enough synthesis gas to provide not less than, the equipment operation is restored.

[0072] Such as Figure 3 shown, is the flowchart of the subsystem selection scheme of the present invention.

[0073] Taking the design condition of the system production capacity of 108 tons of ammonia per year as an example, the total number of systems N is 8, and the system dynamic changes are analyzed under the conditions that the production capacity loads of the eight subsystems S1-S8 are 150 tons, 130 tons, 110 tons, 90 tons, 70 tons, 50 tons, 30 tons, and 10 tons. Based on the system optimization algorithm of "least equipment", the selection process is as follows under the condition of the change of the production capacity at the supply end.

[0074] The input Q is 108, and the production capacity E of 8 subsystems is input i . The production capacity of the first subsystem is selected as 70 tons, and the production capacity of the second subsystem is 130 tons. At this time, the production capacity coverage of the subsystems has been satisfied [Q min ,Q max , then the selected scheme is the subsystems of 70 tons and 130 tons.

[0075] Taking the design condition of the system production capacity of 330 tons of ammonia per year as an example, the total number of systems N is 8, and the system dynamic changes are analyzed under the conditions that the production capacity loads of the eight subsystems S1-S8 are 150 tons, 130 tons, 110 tons, 90 tons, 70 tons, 50 tons, 30 tons, and 10 tons. Based on the system optimization algorithm of "least equipment", the selection process is as follows under the condition of the change of the production capacity at the supply end.

[0076] The input Q is 330, and the production capacity E of 8 subsystems is input i . The production capacity of the first subsystem is selected as 70 tons, the production capacity of the second subsystem is 130 tons, the production capacity of the third subsystem is 150 tons, and the fourth subsystem is 50 tons. At this time, the total production capacity coverage of the subsystems has been satisfied [Q min ,Q max , then the selected scheme is the subsystems of 70 tons and 130 tons.

[0077] The preferred specific embodiments of the present invention have been described in detail above. It should be understood that those of ordinary skill in the art can make many modifications and variations based on the concept of the present invention without creative efforts. Therefore, all technical solutions that can be obtained by those skilled in the art in the technical field based on the concept of the present invention through logical analysis, reasoning, or limited experiments on the basis of the prior art shall fall within the protection scope determined by the claims.

Claims

1. An intensive modular offshore floating ammonia synthesis system, characterized in that, The ammonia synthesis system is intensively composed of multiple parallel offshore floating ammonia synthesis subsystems, and the multiple subsystems receive raw gas through a unified gas source supply pipeline and output synthetic ammonia through a collection pipeline. The subsystems are composed of multiple modular components connected in series and parallel according to the sequence of the offshore ammonia production process. The modular components are composed of one or more equipment units with the same function connected in parallel.

2. The intensive modular offshore floating ammonia synthesis system according to claim 1, wherein The hydrogen in the raw gas is obtained by electrolyzing water through offshore wind power generation.

3. The intensive modular offshore floating ammonia synthesis system according to claim 1, characterized in that, The modular components include: a renewable energy power supply system, a seawater desalination system, a water electrolysis hydrogen production system, an air separation nitrogen production system, a synthesis gas compressor unit, a circulating gas compressor unit, an ammonia synthesis system, an ammonia separation system, a heating system and a waste heat recovery system.

4. The intensive modular offshore floating ammonia synthesis system according to claim 1, characterized in that, The maximum production capacities among multiple sets of the subsystems are different and there are differences. The production capacities are E1, E2, E3, ……, E N , and the production capacities satisfy E i > E i+1 > E i × 50%.

5. The intensive modular offshore floating ammonia synthesis system according to claim 1, characterized in that, The modular components adjust the subsystem capacity by controlling the opening of the control valve group. The adjustment range of the subsystem capacity is 50% to 100%, and the capacity can be reduced to 0 by stopping the vehicle.

6. A configuration method for an intensive modular offshore floating ammonia synthesis system according to any one of claims 1-5, characterized in that, The steps include: S61: Determine the total production capacity Q, the minimum production capacity Q min and the target production capacity Q max ; S62: Based on the minimum production capacity Q min , perform subsystem selection and matching, and mark the production capacities of the selected M sets of subsystems as C1, C2, C3, …… C M , the number of selected subsystem sets M should satisfy Equation (2): M≤N (2) Where N is the total number of subsystems; S63: Calculate the total production capacity of the selected M subsystems in step S62 using equations (3) and (4), and the production capacity of the selected M subsystems meets the requirement that the adjustable range completely covers the total production capacity range Q min to Q max , as shown in equation (5): a i ∈[0]∪[0.5,1] (4) 7. The configuration method of the intensive modular offshore floating ammonia synthesis system according to claim 6, characterized in that, In step (1), the relationship between Q and Q min , and the relationship between Q and Q max is shown in Equation (1):

8. The configuration method of the intensive modular offshore floating ammonia synthesis system according to claim 6, characterized in that, The specific steps include: S81: Select the first set of subsystems, where the production capacity C1 of the selected subsystems satisfies that 50% of its production capacity is less than Q min , and the absolute value of the difference between 50% of its production capacity and Q min is the smallest among all subsystems. The relationship between the C1 and Q min is shown in Equation (6): S82: If the production capacity of C1 is greater than or equal to Q max , then output the selection and matching plan; if the production capacity of C1 is less than Q max , then proceed to the selection and matching of the next subsystem until the total production capacity of the selected subsystems is greater than or equal to Q max , and then output the selection and matching plan, as shown in Equation (7): And the production capacity C of the selected subsystem i should satisfy the relational expression (8) or (9):

9. The configuration method of the intensive modular offshore floating ammonia synthesis system according to claim 8, characterized in that, When the number of selected subsystems M = N, that is, all available subsystems are exhausted and the total production capacity is still lower than Q max , it is determined that "there is no feasible selection and matching solution under the current production capacity demand", the process is terminated and an abnormal status is output.

10. The configuration method of the intensive modular offshore floating ammonia synthesis system according to claim 8, characterized in that, When the production capacity of all subsystems drops to Q min or below, start the extreme condition response mechanism, including the following steps: First, start the thermal cycle compensation circuit, maintain the core temperature of the reactor at ≥180°C, control the energy consumption at 12%-15% of the normal operation, avoid thermal stress damage, adjust the overall equipment to the heat preservation state, and resume the operation of the equipment when there is enough syngas to provide not less than

Images