Hydrogen ammonia preparation zero-carbon comprehensive energy application system based on offshore renewable energy power

Abstract

The application provides a hydrogen-ammonia preparation zero-carbon comprehensive energy application system based on offshore renewable energy power, and specifically comprises a renewable energy power module, an offshore energy platform module and a hydrogen-ammonia application module, wherein the renewable energy power module comprises an offshore photovoltaic module, an offshore wind power module and an ocean tidal energy module; the offshore energy platform module comprises an intelligent control module, an air separation device, an electrolytic water hydrogen production device, an ammonia synthesis device, a buffer storage device and a hydrogen-ammonia power generation device; the hydrogen-ammonia application module comprises an offshore transportation system and a hydrogen-ammonia energy comprehensive application system, and the hydrogen-ammonia energy comprehensive application system comprises a hydrogen production and hydrogenation integrated station, an ammonia filling station and distributed power generation equipment. The application applies the power generated by the renewable energy power module to the offshore energy platform module for hydrogen production and ammonia synthesis, and then transports the hydrogen and ammonia to the onshore hydrogen-ammonia application module for application, so that the application of zero-carbon comprehensive green energy is truly realized.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of offshore energy application, and particularly relates to a hydrogen-ammonia preparation zero-carbon comprehensive energy application system based on offshore renewable energy power. BACKGROUND

[0002] In recent years, due to environmental problems and the increase of power demand, the proportion of new energy represented by wind power and photovoltaic power in the power system in China is increasing, which has brought problems such as power fluctuation and curtailment of wind and light. Hydrogen, as a high-energy-density energy storage carrier, has shown great potential in absorbing excess new energy power. Therefore, with the development of hydrogen energy technology, on-site hydrogen production from new energy has gradually become the preferred solution.

[0003] A Chinese patent with publication number CN116221028A discloses an ammonia-hydrogen conversion zero-carbon comprehensive energy system based on offshore wind power, which comprises an offshore wind and light power generation system, an offshore ammonia-hydrogen energy production system, an offshore transportation system, an onshore centralized energy storage and distribution system, and an onshore comprehensive utilization system connected in sequence; the offshore wind and light power generation system is used for power generation, and the power generated by the offshore wind and light power generation system is transmitted to the offshore ammonia-hydrogen energy production system through a cable; the offshore ammonia-hydrogen energy production system is used for preparing ammonia and liquefying and storing the prepared ammonia; the offshore transportation system is used for receiving the liquid ammonia stored in the offshore ammonia-hydrogen energy production system and transporting the liquid ammonia to the onshore centralized energy storage and distribution system; the onshore centralized energy storage and distribution system is used for distributing the liquid ammonia to downstream user ends; and the onshore comprehensive utilization system is used for energy utilization at the downstream user ends. The present application proposes a zero-carbon energy system taking ammonia as a hydrogen carrier to solve the problems of energy storage, transportation and utilization, and realizes long-distance transportation and utilization of renewable energy. However, the above-mentioned application and the prior art still have the following defects: (1) the output power of wind power generation is greatly affected by environmental factors, and its output power fluctuation is large and difficult to predict, and its access to the power grid will bring certain voltage and frequency fluctuation problems, affecting the stability of the power grid, leading to the decline of power supply quality of the power grid, and in actual operation, the output power of the offshore energy platform module may suddenly increase or decrease, which cannot ensure reliable power distribution in the face of extreme changes in wind power output power, and cannot guarantee the final smooth effect of wind power and the efficient and reasonable configuration of the capacity of the water electrolysis hydrogen production device; (2) the offshore ammonia synthesis device is large and unreasonable, the system heat utilization rate is low, the ammonia conversion rate is low, and the system production load and energy consumption are high; (3) the offshore transportation cost is high, and the economic benefit is low; (4) the traditional ammonia synthesis system equipment is large, the use platform space and operation conditions are complex, the offshore wind power is large, and the economic benefit is low. SUMMARY

[0004] In view of the deficiencies of the prior art, the present application proposes a hydrogen-ammonia preparation zero-carbon comprehensive energy application system based on offshore renewable energy power.

[0005] To realize the above technical scheme, the application provides a hydrogen ammonia preparation zero-carbon comprehensive energy application system based on offshore renewable energy power, and specifically comprises: a renewable energy power module, the renewable energy power module comprises an offshore photovoltaic module, an offshore wind power module and an ocean tidal energy module, wherein the offshore photovoltaic module converts light energy into electric energy, the offshore wind power module converts wind energy into electric energy, and the ocean tidal energy module converts tidal kinetic energy into electric energy; a part of the generated electric energy is directly supplied to an offshore energy platform module through an electrical system for energy conversion, and the other part of the electric energy is transported to an energy storage system for ensuring system stability through multi-energy coordination when photovoltaic, wind power and tidal energy power conversion is absent or no power conversion is performed; the offshore energy platform module comprises an intelligent control device, an air separation device, an electrolytic water hydrogen production device, an ammonia synthesis device, a buffer storage device and a hydrogen ammonia power generation device, and the above-mentioned devices are designed to be small and installed on the offshore energy platform through system integration; wherein the intelligent control device is used for absorbing fluctuation in output power of the renewable energy power module and optimizing power capacity configuration; when power generated by the renewable energy power module is higher than the requirement of the offshore energy platform module, the excess power exceeding the requirement of the offshore energy platform module is absorbed through the energy storage system; when the output of the renewable energy power module is insufficient, the hydrogen in the hydrogen storage tank is discharged or the renewable energy power module energy storage system is discharged through the hydrogen ammonia power generation device to make up for the power shortage, so as to meet the requirement of module use power; the air separation device uses air as raw material, and air is changed into liquid through compression and deep freezing, and then nitrogen is gradually separated from the liquid air through rectification; the electrolytic water hydrogen production device comprises an electrolytic cell, an electrical part, a separation and purification system, a cooling system, a water replenishment and alkali system and a thermal control system; renewable power after rectification is introduced into the electrolytic cell filled with electrolyte, water molecules are subjected to electrochemical reaction on the electrode to be decomposed into hydrogen and oxygen, the hydrogen is transported to the buffer storage device after separation, purification and cooling, and the thermal control system comprises automatic detection, adjustment, display, fault alarm, automatic start and stop and other functions to ensure stable operation of the system under working conditions; the ammonia synthesis device is used for synthesizing ammonia; hydrogen generated by the electrolytic water hydrogen production device and nitrogen generated by the air separation device are stored in the buffer storage device and then transported to the ammonia synthesis tower for hydrogen ammonia synthesis after being called by the control system; ammonia obtained after reaction in the ammonia synthesis tower is cooled in the heat exchange system and then enters the ammonia separator to separate ammonia and unreacted gas; the separated ammonia is transported to the buffer storage device for storage; the hydrogen ammonia application module comprises an offshore transportation system and a hydrogen ammonia energy comprehensive application system, the hydrogen ammonia energy comprehensive application system comprises a hydrogen production and hydrogenation integrated station, an ammonia filling station and distributed power generation equipment; wherein the offshore transportation system uses ammonia hydrogen fuel cell powered ships to transport liquid ammonia produced by the ammonia synthesis device to the hydrogen production and hydrogenation integrated station, the ammonia filling station or the distributed power generation on land.The hydrogen production and hydrogenation integrated station is used for cracking the liquid ammonia delivered by the offshore transportation system to generate hydrogen and nitrogen, the generated hydrogen is compressed by a compressor to a certain pressure, and then is filled to vehicles by filling equipment for use or is combusted by a fuel cell to generate electricity for use; the ammonia filling station fills ammonia to ships and vehicles by ammonia filling equipment for use as power; the distributed power generation equipment is used for generating hydrogen by cracking ammonia or by electrolyzing water, and the generated hydrogen is used to generate electricity by a fuel cell to supply power to a base station, emergency power, and data center power.

[0006] Preferably, the intelligent control module in the offshore energy platform module accommodates the fluctuation in the power output of the renewable energy power module in the following manner:

[0007] S1, determine whether the output power P w (t) of the renewable energy power module meets the active power fluctuation limit value of 1 min and 10 min required for grid connection, if P w (t) meets the standard, directly connect the output power of the renewable energy power module to the grid, if not, perform the next step;

[0008] S2, perform n (n=1) layer wavelet packet decomposition on the output power P w (t) of the renewable energy power module, and use db6 wavelet as the wavelet basis for wavelet packet decomposition according to the characteristics of the power signal;

[0009] S3, reconstruct the n layer wavelet coefficients after decomposition to obtain the low frequency component S n,0 and the high frequency fluctuation component S n,i ;

[0010] S4, determine whether the low frequency component S n,0 after n layer wavelet packet decomposition and reconstruction meets the technical regulation standard for connecting the renewable energy power module to the power system, if not, repeat step S2 to perform n+1 layer wavelet packet decomposition, when the fluctuation amplitude limit is met, determine the optimal number of wavelet packet decomposition as n, and stop the cycle.

[0011] Preferably, the wavelet packet decomposition method of the intelligent control module in the offshore energy platform module is as follows:

[0012] S21, determine the allowable range of power grid connection power fluctuation of the renewable energy power module according to the relevant requirements in the grid connection standard;

[0013] S22, determine whether the power P w (t) generated by the renewable energy power module has met the grid connection index, if not, use wavelet packet decomposition to smooth the power P w (t) generated by the renewable energy power module, and gradually deepen the decomposition layer number n;

[0014] S23, when the P n,0 When the grid-connected requirement is met, n0 is recorded as the optimal decomposition layer number in the power fluctuation case of the power generation, and P n,0 is recorded as P0(t), P w (t) and P0(t) are the difference values, that is, the fluctuation P s (t) in the original renewable energy power module power generation, which is also the fluctuation that the renewable energy power module needs to absorb.

[0015] Preferably, in the step S23, P s (t) is obtained by superimposing a series of power components corresponding to different frequency intervals, which is also the power fluctuation component that the renewable energy power module needs to absorb, P s (t) is calculated by amplitude detection and superimposing a part of positive power components to obtain the input power of the offshore energy platform module.

[0016] Preferably, the intelligent control module in the offshore energy platform module optimizes the power capacity configuration in the following manner:

[0017] Step 1: using the IWOA algorithm, first set the size of the whale population N p , then the initial population X = [x1, x2, ··· x Np ], the maximum number of iterations t max , initialize A, C, and a values, wherein A and C are random parameters, and a is a control parameter;

[0018] Step 2: calculate the fitness value of each individual {f(Xi), i = 1, 2, ···, Np}, and record the current optimal individual and position X best ;

[0019] Step 3: calculate the convergence factor a according to formula 1, and then update the A and C values according to formula 2 and formula 3;

[0020]

[0021] A = 2ar-a formula 2;

[0022] C = 2r formula 3;

[0023] Wherein r is a random number in [0, 1];

[0024] Step 4: perform random difference mutation disturbance on the optimal individual in the current population, and update the current whale individual position according to formula 4;

[0025] X t+1 = r × (X best -X t ) + r × (Xrand - X t ) Formula 4;

[0026] wherein X rand is a random whale individual;

[0027] Step 5: Determine whether the iteration number t reaches the maximum value t max If the maximum iteration number is reached, output the fitness value of the optimal solution, otherwise return to step 3 for continuous execution.

[0028] Preferably, the ammonia synthesis device specifically comprises a compressor, an ammonia synthesis tower, a waste heat boiler, a heat exchanger, a deoxygenated water preheater, a water cooler, a post-cooler, a condenser, a circulating machine, an ammonia separator, a first ammonia cooler, a second ammonia cooler, a primary flash tank, a secondary flash tank and an absorption tower, wherein the feed inlet of the compressor is connected with the hydrogen outlet of the electrolytic water hydrogen production device and the fresh air pipeline through pipelines respectively, the outlet of the compressor is connected with the gas inlet of the ammonia synthesis tower, the outlet of the ammonia synthesis tower is connected with the gas inlet of the waste heat boiler, the outlet of the waste heat boiler is connected with the feed inlet of the heat exchanger through a pipeline, the outlet of the heat exchanger is connected with the feed inlet of the deoxygenated water preheater, the outlet of the deoxygenated water preheater is connected with the feed inlet of the water cooler, the outlet of the water cooler is connected with the feed inlet of the post-cooler, the outlet of the post-cooler is connected with the first feed inlet of the condenser, the first outlet of the condenser is connected with the feed inlet of the circulating machine, the outlet of the circulating machine is connected with the feed inlet of the compressor through a pipeline, the second outlet of the condenser is connected with the feed inlet of the primary flash tank through a pipeline, the third outlet of the condenser is connected with the feed inlet of the first ammonia cooler, the outlet of the first ammonia cooler is connected with the feed inlet of the second ammonia cooler, the outlet of the second ammonia cooler is connected with the feed inlet of the ammonia separator, the first outlet of the ammonia separator is connected with the second feed inlet of the condenser, the second outlet of the ammonia separator is connected with the feed inlet of the primary flash tank, the gas outlet of the primary flash tank is connected with the feed inlet of the compressor through a pipeline, the liquid outlet of the primary flash tank is connected with the feed inlet of the secondary flash tank through a pipeline, the liquid outlet of the secondary flash tank is connected with the green ammonia storage tank, and the gas outlet of the secondary flash tank is connected with the absorption tower.

[0029] Preferably, the ammonia synthesis device synthesizes ammonia by the following method: hydrogen produced by the water electrolysis hydrogen production device, fresh air, and unreacted gas are mixed in a compressor and then transported into an ammonia synthesis tower for hydrogen ammonia synthesis. The high-temperature mixed gas obtained after reaction in the ammonia synthesis tower is introduced into a waste heat boiler for waste heat recovery and by-product steam production. The temperature of the gas after reaction is reduced to 190°C, and then the gas is introduced into a heat exchanger from the upper part of the waste heat boiler. The gas is introduced into the upper heat exchanger tube from the top of the heat exchanger, and the temperature of the gas is reduced to about 90°C after heat exchange between the gas in the tube and the gas in the tube. The gas is then introduced into a water cooler, and the temperature of the gas is reduced to about 20°C after the water cooler. The gas is then introduced into a post-cooler to further reduce the temperature of the gas to about 10°C. The gaseous ammonia in the gas is cooled to a misty liquid ammonia, and then the liquid ammonia is introduced into a condenser. The gas in the condenser is heat-exchanged with the cold gas from the ammonia separator in the upper part of the condenser, and the temperature of the gas is reduced to about 1°C. The gas is then introduced into a cyclone separator in the lower part of the condenser for the first separation of liquid ammonia. Most of the liquid ammonia in the gas is separated, and the separated gas and a small amount of liquid ammonia are introduced into the annular gap between the inner part and the outer cylinder from the upper side. The gas is introduced into a first ammonia cooler and then a second ammonia cooler, and the temperature of the gas is reduced to about -10°C. The gas is then introduced into the condenser as a refrigerant. The liquid ammonia separated from the second ammonia cooler and the condenser is reduced to 5.1 MPa and then introduced into a primary flash tank. Most of the hydrogen and nitrogen gas is flashed out of the primary flash tank and directly introduced into the fresh gas pipeline to be introduced into the compressor. The liquid ammonia from the primary flash tank is introduced into a secondary flash tank. The secondary flash tank is operated at a pressure of 2.5 MPa. The flashed gas is introduced into an absorption tower, absorbed, and then introduced into a boiler system for combustion. The ammonia water is introduced into a flue gas desulfurization system. The liquid ammonia from the secondary flash tank is introduced into a green ammonia storage tank for storage.

[0030] The preferred hydrogen fuel cell power ship comprises a ship body, an ammonia storage module, an ammonia hydrogen production module, a hydrogen supply module and a hydrogen fuel cell, wherein the ammonia storage module comprises a green ammonia storage tank, a monitoring system and an emergency exhaust system, the inside of the green ammonia storage tank is kept at room temperature, during the filling of ammonia fuel, the inside pressure is adjusted by an inlet control valve on the green ammonia storage tank to keep it within a safe range, and during the use of ammonia fuel, the outlet pressure can be adjusted by an outlet control valve on the green ammonia storage tank; the ammonia hydrogen production module comprises an ammonia decomposition furnace and a gas separation device, the ammonia decomposition furnace adopts a high-temperature electric heating decomposition method to produce ammonia, and then the mixed gas after reaction is injected into the gas separation device, the ammonia gas in the mixed gas that has not reacted is separated out by the gas separation device, re-introduced into the ammonia decomposition furnace for reaction, the nitrogen gas is discharged into the air, and the hydrogen gas is introduced into the hydrogen supply module; the hydrogen supply module comprises a hydrogen treatment device and a monitoring device, the hydrogen treatment device purifies, dries and processes the hydrogen produced by the ammonia hydrogen production module to generate hydrogen meeting the purity, pressure and temperature requirements of the hydrogen fuel cell, and the monitoring device is used to monitor whether the hydrogen produced by the hydrogen treatment device meets the purity, pressure and temperature requirements of the hydrogen fuel cell in real time; and the hydrogen fuel cell is used to provide power for the ship body.

[0031] Preferably, the hydrogen production and hydrogenation integrated station comprises an ammonia cracking reactor, a separation device, a hydrogen purification device, a compression device and a filling device, liquid ammonia is cracked by a high-temperature catalyst or an electric catalytic cracking to generate hydrogen and nitrogen, the separation device and the hydrogen purification device separate the unconverted ammonia for reuse, and the purified hydrogen is compressed to a certain pressure by the compressor and then filled into the vehicle for use or used for fuel cell combustion power generation by the filling device.

[0032] The hydrogen-ammonia preparation zero-carbon comprehensive energy application system based on offshore renewable energy power has the following advantages:

[0033] 1) The power generated by the renewable energy power module is transmitted to the electrolytic water hydrogen production device of the offshore energy platform through a cable for electrolysis to produce hydrogen, the hydrogen produced by the electrolytic water hydrogen production device and the nitrogen in the air are synthesized into green ammonia liquid by the ammonia synthesis device, and then stored in a storage tank, the offshore transportation system uses an ammonia hydrogen fuel cell power ship, the liquid ammonia produced by the ammonia synthesis device is fully utilized as the power source of the offshore transportation ship, the liquid ammonia is transported to a land hydrogen production and hydrogenation integrated station or an ammonia filling station, the cold chain logistics ship can use ammonia for refrigeration, hydrogen is generated by ammonia high-temperature catalytic cracking, the nitrogen can be used as a system protection gas, the hydrogen is pressurized and then filled into a fuel cell or directly used for fuel cell combustion power generation, and the ammonia can be directly filled into a vehicle or used for power generation by mixing with coal-fired power generation. In the present application, all energy comes from wind, sun and sea, and the application of zero-carbon comprehensive green energy is truly realized.

[0034] 2)The present application sets up the air separation system, the hydrogen production device by electrolyzing water, the ammonia synthesis device, the buffer storage system, the hydrogen ammonia power generation system in the container of the offshore energy platform module, and the small pry dress equipment can be easily moved and installed due to the modular design of the system module, and the quick deployment is facilitated, and the installation cost is reduced, and the equipment has unique advantages in the occasion of high design and use of limited site such as offshore platform and the need for quick deployment.

[0035] 3)The present application realizes the fluctuation suppression of the renewable energy power module power output through the intelligent control design of the hydrogen production device by electrolyzing water, and the fluctuation of the output power is used for electrolyzing water to produce hydrogen, so that the utilization rate of the wind power output is improved while the power grid operation is stabilized.When the power generated by the renewable energy power module is higher than the grid connection requirement, the excess power is consumed by electrolyzing water in the electrolytic cell, and the utilization rate of the power is improved.When the renewable energy power module output is insufficient to meet the power grid or load demand, the fuel cell consumes hydrogen in the hydrogen storage tank to discharge, and the power shortage of the renewable energy power module is made up, so that the purpose of smoothing the system on-grid power is achieved, and the unbalanced power caused by the response delay of the electrolytic cell and the fuel cell is smoothed through the super capacitor which can be quickly charged and discharged, so that the real-time consistency of the mixed system output and the load demand is ensured.

[0036] 4)The present application innovatively designs the ammonia synthesis process, reduces the system resistance by reducing the system reaction pressure and optimizing the fresh gas supplement process, reduces the fresh gas consumption by optimizing the purge gas recovery process, improves the system heat utilization rate by increasing the oxygen removal water preheater process optimization, increases the steam production by recovering waste heat through the waste heat boiler, reduces the production load and energy consumption of the refrigeration system by increasing the after-cooler process optimization, and effectively realizes the purpose of energy saving and consumption reduction of the ammonia synthesis device.

[0037] 5)The present application optimizes the design of the offshore transportation system, and adopts the ammonia hydrogen fuel cell power ship as the main body of liquid ammonia transportation, which can greatly reduce the transportation cost by using the liquid ammonia generated by the ammonia synthesis device as the power source, and the ammonia hydrogen fuel cell power ship has great advantages in safety, economy and convenience compared with the traditional fuel cell power ship. BRIEF DESCRIPTION OF DRAWINGS

[0038] Figure 1 The system module diagram of the present application.

[0039] Figure 2 The system flow chart of the present application.

[0040] Figure 3 The flow chart of the ammonia synthesis device in the present application.

[0041] Figure: 1, compressor; 2, ammonia synthesis tower; 3, waste heat boiler; 4, heat exchanger; 5, deoxygenated water preheater; 6, water cooler; 7, aftercooler; 8, condenser; 9, circulating machine; 10, ammonia separator; 11, first ammonia cooler; 12, second ammonia cooler; 13, first-stage flash tank; 14, second-stage flash tank; 15, absorption tower. DETAILED DESCRIPTION

[0042] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art without creative work fall within the protection scope of the present application.

[0043] Embodiment: A hydrogen-ammonia preparation zero-carbon comprehensive energy application system based on offshore renewable energy power.

[0044] Referring to Figure 1 and Figure 2 , the present application provides a hydrogen-ammonia preparation zero-carbon comprehensive energy application system based on offshore renewable energy power, which specifically comprises:

[0045] (I) Renewable energy power module: including offshore photovoltaic module, offshore wind power module and ocean tidal energy module, the offshore photovoltaic module converts light energy into electric energy, wherein the offshore wind power module converts wind energy into electric energy, and the ocean tidal energy module converts tidal kinetic energy into electric energy. Part of the generated electric energy is directly supplied to the offshore energy platform module for energy conversion through the electrical system, and the other part of the electric energy is transported to the energy storage system for use in the absence of photovoltaic, wind power, and tidal energy power conversion or when there is no power conversion, so as to ensure that the system does not stop and is kept warm, and the multi-energy coordination and complementation can solve the problems of volatility and stability of renewable energy to a certain extent. The offshore wind power module is composed of a plurality of offshore wind turbine units, and the offshore wind turbine unit structure mainly includes blades, a hub, a main shaft, a gear box, a coupling, a generator, a tower drum, a foundation platform, and an anchor chain. The blades convert wind energy into low-speed and large-torque mechanical energy, which is transmitted to the main shaft, and then transmitted to the gear box by the main shaft. The gear box is connected with the generator, and the high-speed and large-torque load output by the gear box drives the generator to generate electricity.

[0046] (ii) Offshore energy platform module: including intelligent control module, air separation device, electrolytic water hydrogen production device, ammonia synthesis device, buffer storage device, hydrogen ammonia power generation device, the above-mentioned equipment is realized miniaturization, skid-mounted installation on offshore energy platform through sub-system integration design; wherein, the intelligent control system is used for absorbing the fluctuation in the output power of the renewable energy power module and optimizing the configuration of the power capacity, when the power generated by the renewable energy power module is higher than the demand of the offshore energy platform module, the excess power exceeding the requirement of the offshore energy platform module is absorbed by the energy storage system, when the output of the renewable energy power module is insufficient to meet the load demand, the hydrogen in the hydrogen storage tank is discharged by the fuel cell to make up for the power shortage, so as to meet the requirement of the module use power; the buffer storage device realizes the unbalanced power caused by the response delay of the electrolytic cell and the fuel cell through the way of fast charging and discharging or the multi-energy complementary balance calculated by the intelligent control module; the air separation device takes air as raw material, through the method of compression and deep freezing, the air is changed into liquid, and then the nitrogen is gradually separated from the liquid air through rectification; the electrolytic water hydrogen production device includes electrolytic cell, electrical part, separation and purification system, cooling system, water supplementing and alkali system, thermal control system, renewable power after rectification is input into the electrolytic cell full of electrolyte, water molecules are decomposed into hydrogen and oxygen on the electrode through electrochemical reaction, the hydrogen is transported to the buffer storage after separation, purification and cooling, the thermal control system includes automatic detection, adjustment, display, fault alarm, automatic start and stop functions, etc., to ensure the stable operation of the system under working condition; the ammonia synthesis device is used for synthesizing ammonia, the hydrogen produced by the electrolytic water hydrogen production device and the nitrogen produced by the air separation device are transported into the ammonia synthesis tower for hydrogen ammonia synthesis, the ammonia gas obtained after reaction in the ammonia synthesis tower is cooled in the heat exchange system and then enters the ammonia separator to separate the ammonia gas and unreacted gas, the separated ammonia gas is transported to the buffer storage device for storage.

[0047] In this embodiment, the electrolytic water hydrogen production device includes electrolytic cell, hydrogen storage tank, fuel cell and super capacitor, when the power generated by the renewable energy power module is higher than the grid connection requirement, the excess power is absorbed by electrolyzing water through the electrolytic cell; when the output of the renewable energy power module is insufficient to meet the grid connection or load demand, the hydrogen in the hydrogen storage tank is discharged by the fuel cell to make up for the power shortage, so as to meet the requirement of the grid connection power; the super capacitor balances the unbalanced power caused by the response delay of the electrolytic cell and the fuel cell through the way of fast charging and discharging.

[0048] In the above-mentioned water electrolysis hydrogen production device, the renewable energy power module completes the conversion of wind energy, light energy and tidal energy into electric energy, the electrolytic tank consumes electric energy to produce hydrogen, the hydrogen storage tank stores hydrogen, and the fuel cell discharges hydrogen to convert hydrogen energy into electric energy. The water electrolysis hydrogen production device as a whole constitutes an energy closed loop structure of electric energy-hydrogen energy-electric energy.

[0049] According to the structure of the above-mentioned water electrolysis hydrogen production device, part of the electric power generated by the renewable energy power module is directly connected to the grid, and the other part of the electric energy is used to electrolyze water to produce hydrogen by the electrolytic tank. When the electric power of the renewable energy power module is higher than the requirement of grid connection, the phenomenon of abandoned wind and light occurs. At this time, the electrolytic tank electrolyzes water to consume the excess wind and light power that exceeds the requirement of grid connection, thereby improving the utilization rate of wind and light power. When the output of the renewable energy power module is insufficient to meet the demand of the grid or load, the fuel cell consumes the hydrogen in the hydrogen storage tank to discharge, thereby making up for the shortage of electric power of the renewable energy power module and achieving the purpose of smoothing the grid power. The super capacitor smoothes the unbalanced power caused by the response delay of the electrolytic tank and the fuel cell through fast charging and discharging, thereby ensuring the real-time consistency of the output of the hybrid system and the load demand.

[0050] In actual operation, the output power of the renewable energy power module is greatly affected by environmental factors and is difficult to predict. When the renewable energy power module is connected to the grid, it will cause certain voltage and frequency fluctuations, affecting the stability of the grid and leading to a decrease in the power supply quality of the grid. For the grid-connected power hydrogen production system, the output power of the renewable energy power module may suddenly increase or decrease in actual operation. The traditional fluctuation suppression control method does not consider the negative influence of the irregular random fluctuation of the output power of the renewable energy power module on the suppression control, and cannot ensure reliable power distribution in the face of extreme changes in the output power of the renewable energy power module. Therefore, it is difficult to ensure the final smoothing effect of the output power of the renewable energy power module and the efficient and reasonable configuration capacity of the water electrolysis hydrogen production device.

[0051] In order to solve the above technical problems, the present application provides a method which can effectively consume the fluctuation in the output power of the renewable energy power module, reduce the influence of the grid connection of the renewable energy power module on the grid, and improve the utilization rate of electric power, which specifically comprises the following steps:

[0052] S1, judging whether the output power P w (t) of the renewable energy power module meets the active power fluctuation limit value of 1min and 10min required for grid connection, if P w (t) meets the standard, the output power of the renewable energy power module can be directly connected to the grid, and if it does not meet the standard, the next step is executed.

[0053] S2, Output power P of renewable energy power module w (t) Perform n (n=1) level wavelet packet decomposition. Based on the characteristics of the power signal, the db6 wavelet is used as the wavelet basis for wavelet packet decomposition. The wavelet packet decomposition method is as follows:

[0054] S21. Establish the allowable range of grid-connected power fluctuations for renewable energy power modules in accordance with the relevant requirements in the grid connection standards;

[0055] S22. Determine the power generation P of the renewable energy power module. w (t) Whether the grid connection indicators have been met. If not, wavelet packet decomposition is used to smooth the power generation P of the renewable energy power module. w (t), gradually increasing the decomposition level n;

[0056] S23, when the decomposition yields P n,0 When grid connection requirements are met, n0 is denoted as the optimal decomposition level under the power generation fluctuation condition, and P is also denoted as... n,0 Let it be denoted as P0(t), P w The difference between P(t) and P0(t) is the fluctuation P in the original renewable energy power generation module. s (t) is also the fluctuation that the renewable energy power module needs to absorb, where P s (t) is obtained by superimposing a series of power components corresponding to different frequency ranges, and is also the power fluctuation component that the renewable energy power module needs to absorb. s (t) The input power of the water electrolysis hydrogen production device is obtained by superimposing a portion of the positive power component through amplitude detection. The input power of the hybrid water electrolysis hydrogen production device is obtained through the above adaptive wavelet packet decomposition process. The power input to the hydrogen production system needs to be further allocated to obtain the operating power of each electrolyzer, thereby effectively improving the actual power mitigation performance of the hybrid water electrolysis hydrogen production device on the output power of the renewable energy power module.

[0057] S3. Reconstruct the nth layer wavelet coefficients after decomposition to obtain the low-frequency component S. n,0 With high-frequency fluctuation component S n,i ;

[0058] S4. Determine the low-frequency component S after n-level wavelet packet decomposition and reconstruction. n,0 If the technical specifications for connecting renewable energy power modules to the power system are not met, repeat step S2 to perform n+1 layers of wavelet packet decomposition. When the fluctuation amplitude limit is met, determine the optimal number of layers for wavelet packet decomposition as n, and stop the loop.

[0059] Through the above method, the fluctuation of the renewable energy power module power generation output power can be suppressed, and the fluctuation amount of the output power is used for water electrolysis hydrogen production, thereby stabilizing the power grid operation and improving the utilization rate of the renewable energy power module power generation output power.

[0060] In the water electrolysis hydrogen production device provided by the application, when the output power of the renewable energy power module at time t is less than the required power for grid connection, the fuel cell starts to discharge hydrogen to work together with the wind turbine generator to output power to bear the grid connection power in this period, to make up for the power difference between the power grid demand and the power output of the generator, to play a "valley filling" role, to reduce the output power fluctuation of the renewable energy power module. However, how to realize the capacity configuration optimization in the water electrolysis hydrogen production device and finally determine the capacity of each device is another difficult problem to be solved by the application. In order to solve the above problem, the intelligent control module in the offshore energy platform module optimizes the power capacity configuration in the following way:

[0061] Step 1: using IWOA algorithm, first setting the size of whale population as N p , the initial population X = [x1, x2, ··· x Np , the maximum iteration number t max , initializing A, C and a values, wherein A and C are random parameters, and a is a control parameter;

[0062] Step 2: calculating the fitness value of each individual {f(Xi), i = 1, 2, ···, Np}, and recording the current optimal individual and position X best ;

[0063] Step 3: calculating the convergence factor a according to formula 1, and then updating the A and C values according to formula 2 and formula 3;

[0064]

[0065] A = 2ar-a formula 2;

[0066] C = 2r formula 3;

[0067] Wherein r is a random number in [0, 1];

[0068] Step 4: performing random difference mutation disturbance on the optimal individual in the current population, and updating the current whale individual position according to formula 4;

[0069] X t+1 = r × (X best -X t ) + r × (X rand -X t ) formula 4;

[0070] Wherein X randfor a random whale individual;

[0071] Step 5: judging whether the iteration number t reaches the maximum value t max If the maximum iteration number is reached, the fitness value of the optimal solution is output, otherwise, returning to step 3 to continue execution.

[0072] The improved IWOA algorithm is used for solving the capacity configuration optimization model of the wind-hydrogen coupling system, and the Pareto optimal solution set of the operation cost and system power deviation of the water electrolysis hydrogen production device can be quickly and accurately calculated, and finally the capacity of each device is determined, so that the capacity configuration optimization of the water electrolysis hydrogen production device is realized.

[0073] The intelligent control design of the water electrolysis hydrogen production device is used to realize the fluctuation suppression of the renewable energy power module power generation output power, and the fluctuation amount of the output power is used for water electrolysis hydrogen production, so that the utilization rate of the wind power generation output power is improved while the power grid operation is stabilized.When the power generated by the renewable energy power module is higher than the grid connection requirement, the excess power generated by the electrolytic cell is used to consume the excess power, and the utilization rate of the power is improved, when the renewable energy power module output is insufficient to meet the grid or load demand, the fuel cell consumes the hydrogen in the hydrogen storage tank to discharge, and the renewable energy power module power generation power shortage is compensated, so that the purpose of smoothing the system on-grid power is achieved, and the super capacitor can quickly charge and discharge to smooth the unbalanced power caused by the response delay of the electrolytic cell and the fuel cell, and ensure the real-time consistency of the hybrid system output and the load demand.

[0074] In the embodiment, the ammonia synthesis device is used for synthesizing ammonia, the hydrogen generated by the water electrolysis hydrogen production device, fresh air and unreacted gas are mixed in the compressor and then transported into the ammonia synthesis tower for hydrogen ammonia synthesis, the ammonia gas obtained after reaction in the ammonia synthesis tower is cooled in the heat exchange system and then enters the ammonia separator to separate the ammonia gas and the unreacted gas, and the separated ammonia gas is transported to the green ammonia storage tank for storage.

[0075] With reference to Figure 3As shown, the ammonia synthesis device specifically comprises a compressor 1, an ammonia synthesis tower 2, a waste heat boiler 3, a heat exchanger 4, a deoxygenated water preheater 5, a water cooler 6, a post-cooler 7, a condenser 8, a circulating machine 9, an ammonia separator 10, a first ammonia cooler 11, a second ammonia cooler 12, a primary flash tank 13, a secondary flash tank 14, and an absorption tower 15, wherein the feed inlet of the compressor 1 is connected with the hydrogen outlet of the electrolytic water hydrogen production device and a fresh air pipeline through pipelines respectively, the outlet of the compressor 1 is connected with the gas inlet of the ammonia synthesis tower 2, the outlet of the ammonia synthesis tower 2 is connected with the gas inlet of the waste heat boiler 3, the outlet of the waste heat boiler 3 is connected with the feed inlet of the heat exchanger 4 through a pipeline, the outlet of the heat exchanger 4 is connected with the feed inlet of the deoxygenated water preheater 5, the outlet of the deoxygenated water preheater 5 is connected with the feed inlet of the water cooler 6, the outlet of the water cooler 6 is connected with the feed inlet of the post-cooler 7, the outlet of the post-cooler 7 is connected with the first feed inlet of the condenser 8, the first outlet of the condenser 8 is connected with the feed inlet of the circulating machine 9, the outlet of the circulating machine 9 is connected with the feed inlet of the compressor 1 through a pipeline, the second outlet of the condenser 8 is connected with the feed inlet of the primary flash tank 13 through a pipeline, the third outlet of the condenser 8 is connected with the feed inlet of the first ammonia cooler 11, the outlet of the first ammonia cooler 11 is connected with the feed inlet of the second ammonia cooler 12, the outlet of the second ammonia cooler 12 is connected with the feed inlet of the ammonia separator 10, the first outlet of the ammonia separator 10 is connected with the second feed inlet of the condenser 8, the second outlet of the ammonia separator 10 is connected with the feed inlet of the primary flash tank 13, the gas outlet of the primary flash tank 13 is connected with the feed inlet of the compressor 1 through a pipeline, the liquid outlet of the primary flash tank 13 is connected with the feed inlet of the secondary flash tank 14 through a pipeline, the liquid outlet of the secondary flash tank 14 is connected with a green ammonia storage tank, and the gas outlet of the secondary flash tank 14 is connected with the absorption tower 15.

[0076] In actual work, hydrogen produced by the electrolytic water hydrogen production device, fresh air and unreacted gas are mixed in the compressor 1 and then transported to the ammonia synthesis tower 2 for hydrogen ammonia synthesis. The high-temperature mixed gas after the reaction in the ammonia synthesis tower 2 enters the waste heat boiler 3 for waste heat recovery to produce steam. The temperature of the gas after the reaction is reduced to 190°C, and then the gas is discharged from the upper part of the waste heat boiler 3 and enters the heat exchanger 4. The gas is cooled to about 90°C after heat exchange in the heat exchanger 4, and then enters the deoxygenated water preheater 5 for waste heat recycling. Then the gas enters the water cooler 6, and the temperature of the gas after the water cooling is reduced to about 20°C. The gas enters the after-cooler 7 to further reduce the temperature of the gas to about 10°C, so that the gaseous ammonia in the gas is cooled to a misty liquid ammonia. Then the gas enters the condenser 8. The gas is separated from the ammonia in the upper part of the heat exchanger tube in the condenser 8, and the temperature of the gas is reduced to about 1°C. Then the gas enters the cyclone separator in the lower part of the condenser 8 for the first separation of liquid ammonia. Most of the liquid ammonia in the gas is separated, and the separated gas and a small amount of liquid ammonia are discharged from the annular gap between the inner part and the outer cylinder to the upper side. The gas is discharged and then enters the first ammonia cooler 11. The gas enters the second ammonia cooler 12 after the first ammonia cooler 11, and the temperature of the gas is reduced to about -10°C. Then the gas is used as a refrigerant and reenters the condenser 8. The liquid ammonia separated from the second ammonia cooler 12 and the condenser 8 is reduced to 5.1 MPa and then enters the first flash tank 13. Most of the hydrogen and nitrogen gas is directly returned to the fresh gas pipeline and enters the compressor 1. The liquid ammonia discharged from the first flash tank 13 enters the second flash tank 14. The pressure of the second flash tank 14 is 2.5 MPa. The flash gas is sent to the boiler system after being absorbed by the absorption tower 15. The ammonia water is sent to the boiler flue gas desulfurization system. The liquid ammonia discharged from the second flash tank 14 is sent to the green ammonia storage tank for storage.

[0077] The present application innovatively designs the ammonia synthesis process. The system resistance is reduced by reducing the system reaction pressure and optimizing the fresh gas supplement process. The fresh gas consumption is reduced by optimizing the purge gas recovery process. The system heat utilization rate is improved by optimizing the process of the deoxygenated water preheater 5. The steam production is increased by recovering waste heat in the waste heat boiler 3 to produce saturated steam. The production load and energy consumption of the refrigeration system are reduced by optimizing the process of the after-cooler 7. The purpose of energy saving and consumption reduction of the ammonia synthesis device is effectively achieved.

[0078] (III) Hydrogen and ammonia application module: including marine transportation system and hydrogen and ammonia energy comprehensive application system, the hydrogen and ammonia energy comprehensive application system includes hydrogen production and hydrogenation integrated station, ammonia filling station, distributed power generation equipment; wherein, the marine transportation system uses ammonia hydrogen fuel cell power ship, transports liquid ammonia prepared by the ammonia synthesis device to the hydrogen production and hydrogenation integrated station on land or the ammonia filling station. The ammonia hydrogen fuel cell power ship includes a hull, an ammonia storage module, an ammonia hydrogen production module, a hydrogen supply module, and a hydrogen fuel cell. The ammonia storage module includes a green ammonia storage tank, a monitoring system, and an emergency exhaust system. The green ammonia storage tank is kept at room temperature. When filling ammonia fuel, the internal pressure is adjusted by the inlet control valve on the green ammonia storage tank to always remain within a safe range. When using ammonia fuel, the outlet pressure can be adjusted by the outlet control valve on the green ammonia storage tank. The ammonia hydrogen production module includes an ammonia decomposition furnace and a gas separation device. The ammonia decomposition furnace uses high-temperature electric heating decomposition to produce ammonia gas. Then the mixed gas after reaction is injected into the gas separation device. The gas separation device separates the ammonia gas that has not reacted in time from the mixed gas, reintroduces it into the ammonia decomposition furnace for reaction, discharges nitrogen gas into the air, and introduces hydrogen gas into the hydrogen supply module. The hydrogen supply module includes a hydrogen treatment device and a monitoring device. The hydrogen treatment device purifies, dries, and processes the hydrogen gas produced by the ammonia hydrogen production module to generate hydrogen gas that meets the purity, pressure, and temperature requirements of the hydrogen fuel cell. The monitoring device is used to monitor whether the hydrogen gas produced by the hydrogen treatment device meets the purity, pressure, and temperature requirements of the hydrogen fuel cell in real time. The hydrogen fuel cell is used to provide power to the hull.

[0079] In this embodiment, the marine transportation system uses ammonia hydrogen fuel cell power ship to transport liquid ammonia prepared by the ammonia synthesis device to the hydrogen production and hydrogenation integrated station on land or the ammonia filling station. The ammonia hydrogen fuel cell power ship includes a hull, an ammonia storage module, an ammonia hydrogen production module, a hydrogen supply module, and a hydrogen fuel cell. The ammonia storage module includes a green ammonia storage tank, a monitoring system, and an emergency exhaust system. The green ammonia storage tank is kept at room temperature. When filling ammonia fuel, the internal pressure is adjusted by the inlet control valve on the green ammonia storage tank to always remain within a safe range. When using ammonia fuel, the outlet pressure can be adjusted by the outlet control valve on the green ammonia storage tank. The ammonia hydrogen production module includes an ammonia decomposition furnace and a gas separation device. The ammonia decomposition furnace uses high-temperature electric heating decomposition to produce ammonia gas. Then the mixed gas after reaction is injected into the gas separation device. The gas separation device separates the ammonia gas that has not reacted in time from the mixed gas, reintroduces it into the ammonia decomposition furnace for reaction, discharges nitrogen gas into the air, and introduces hydrogen gas into the hydrogen supply module. The hydrogen supply module includes a hydrogen treatment device and a monitoring device. The hydrogen treatment device purifies, dries, and processes the hydrogen gas produced by the ammonia hydrogen production module to generate hydrogen gas that meets the purity, pressure, and temperature requirements of the hydrogen fuel cell. The monitoring device is used to monitor whether the hydrogen gas produced by the hydrogen treatment device meets the purity, pressure, and temperature requirements of the hydrogen fuel cell in real time. The hydrogen fuel cell is used to provide power to the hull.

[0080] The present application optimizes the design of the marine transportation system and uses ammonia hydrogen fuel cell power ship as the main body of liquid ammonia transportation. It can fully utilize the liquid ammonia produced by the ammonia synthesis device as a power source, greatly reducing transportation costs. Compared with traditional fuel cell power ships, ammonia hydrogen fuel cell power ships have great advantages in safety, economy, and convenience.

[0081] The hydrogen production and hydrogenation integrated station is used for cracking the liquid ammonia delivered by the offshore transportation system to generate hydrogen and nitrogen, the generated hydrogen is compressed by the compressor to a certain pressure, and then filled to the vehicle by the filling equipment or used for fuel cell combustion power generation. The hydrogen production and hydrogenation integrated station comprises an ammonia cracking reaction stack, a separation equipment, a hydrogen purification equipment, a compression equipment and a filling equipment, the liquid ammonia is cracked by high-temperature catalyst or electrocatalytic cracking to generate hydrogen and nitrogen, the separation equipment and the hydrogen purification equipment separate the unconverted ammonia for reuse, and the purified hydrogen is compressed by the compressor to a certain pressure, and then filled to the vehicle by the filling equipment or used for fuel cell combustion power generation.

[0082] The application generates hydrogen by electrolysis of the power generated by the renewable energy power module through the cable to the electrolytic water hydrogen production device of the offshore energy platform, synthesizes green ammonia liquid by using the ammonia synthesis device to synthesize hydrogen and nitrogen in the air, and stores it in the storage tank, the offshore transportation system uses ammonia hydrogen fuel cell power ship, fully utilizes the liquid ammonia generated by the ammonia synthesis device as the power source of the offshore transportation ship, delivers the liquid ammonia to the hydrogen production and hydrogenation integrated station or the ammonia filling station on land, and the cold chain logistics ship can use ammonia for refrigeration, hydrogen production and hydrogenation are generated by high-temperature catalytic cracking of ammonia to generate nitrogen and hydrogen, the nitrogen can be used as system protection gas, the hydrogen is filled to the fuel cell after being pressurized or directly used for fuel cell combustion power generation, and the ammonia can be directly filled to the vehicle or used for power generation by ammonia combustion. In the application, all the energy comes from wind, sun and sea, and the application of zero-carbon comprehensive green energy is truly realized.

[0083] The above is the preferred embodiment of the application, but the application should not be limited to the content disclosed in the embodiment and the drawings, so any equivalent or modification completed without departing from the disclosed spirit falls within the protection scope of the application.

Claims

1. A hydrogen-ammonia production zero-carbon integrated energy application system based on offshore renewable energy electricity, characterized in that Comprise: Renewable energy power module: including offshore photovoltaic module, offshore wind power module and ocean tidal energy module, offshore photovoltaic module converts light energy into electric energy, offshore wind power module converts wind energy into electric energy, ocean tidal energy module converts tidal kinetic energy into electric energy, part of the generated electric energy is directly supplied to offshore energy platform module for energy conversion through electrical system, another part of the electric energy is transported to energy storage system for multi-energy coordination to ensure system stability when photovoltaic, wind power, tidal energy power conversion is missing or no power conversion; Offshore energy platform module: including intelligent control device, air separation device, electrolytic water hydrogen production device, ammonia synthesis device, buffer storage device, hydrogen ammonia power generation device, the above-mentioned equipment is designed by small size, skid-mounted installation on offshore energy platform through sub-system integration; wherein the intelligent control device is used for absorbing the fluctuation in the output power of the renewable energy power module and optimizing the configuration of the power capacity, when the electric power generated by the renewable energy power module is higher than the demand of the offshore energy platform module, the excess power exceeding the requirement of the offshore energy platform module is absorbed by the energy storage system, when the output of the renewable energy power module is insufficient, the hydrogen in the hydrogen storage tank is discharged or the renewable energy power module energy storage system is discharged to make up for the power shortage, so as to meet the requirement of module use power; The air separation device uses air as raw material, which is compressed and deeply frozen to become liquid, and then separated from liquid air to produce nitrogen gas, which is stored in the buffer storage device after compression; The electrolytic water hydrogen production device includes electrolytic cell, electrical part, separation and purification system, cooling system, water replenishment and alkali system, and thermal control system, renewable power after rectification is input into the electrolytic cell filled with electrolyte, water molecules are decomposed into hydrogen and oxygen on the electrode through electrochemical reaction, hydrogen is transported to the buffer storage device after separation, purification and cooling, the thermal control system includes automatic detection, adjustment, display, fault alarm, automatic start and stop functions, to ensure the stable operation of the system under working condition; The ammonia synthesis device is used for synthesizing ammonia, the hydrogen produced by the electrolytic water hydrogen production device and the nitrogen produced by the air separation device are stored in the buffer storage device and transported to the ammonia synthesis tower for hydrogen ammonia synthesis after being called by the control system, the ammonia gas obtained after reaction in the ammonia synthesis tower is cooled in the heat exchange system and then enters the ammonia separator to separate the ammonia gas and unreacted gas, the separated ammonia gas is transported to the buffer storage device for storage; The hydrogen-ammonia application module comprises a marine transportation system and a hydrogen-ammonia energy comprehensive application system, and the hydrogen-ammonia energy comprehensive application system comprises a hydrogen production and hydrogenation integrated station, an ammonia filling station and distributed power generation equipment; wherein the marine transportation system uses ammonia to carry hydrogen fuel cell power ships, and transports liquid ammonia produced by the ammonia synthesis device to the hydrogen production and hydrogenation integrated station, the ammonia filling station or the distributed power generation; the hydrogen production and hydrogenation integrated station is used for cracking the liquid ammonia transported by the marine transportation system to generate hydrogen and nitrogen, the generated hydrogen is compressed by a compressor to a certain pressure, and then is filled to vehicles or fuel cells for power generation; the ammonia filling station fills ammonia to ships and vehicles by an ammonia filling device for power; the distributed power generation equipment is used for generating hydrogen by cracking ammonia or by electrolyzing water, and the generated hydrogen is used for power generation by a fuel cell to supply power to a base station, emergency power and data center power; The ammonia synthesis device specifically comprises a compressor, an ammonia synthesis tower, a waste heat boiler, a heat exchanger, a deoxygenated water preheater, a water cooler, a post-cooler, a condenser, a circulating machine, an ammonia separator, a first ammonia cooler, a second ammonia cooler, a first-stage flash tank, a second-stage flash tank and an absorption tower, wherein the feed inlet of the compressor is connected with the hydrogen outlet of the water electrolysis hydrogen production device and a fresh air pipeline through pipelines respectively, the outlet of the compressor is connected with the gas inlet of the ammonia synthesis tower, the outlet of the ammonia synthesis tower is connected with the gas inlet of the waste heat boiler, the outlet of the waste heat boiler is connected with the feed inlet of the heat exchanger through a pipeline, the outlet of the heat exchanger is connected with the feed inlet of the deoxygenated water preheater, the outlet of the deoxygenated water preheater is connected with the feed inlet of the water cooler, the outlet of the water cooler is connected with the feed inlet of the post-cooler, the outlet of the post-cooler is connected with the first feed inlet of the condenser, the first outlet of the condenser is connected with the feed inlet of the circulating machine, the outlet of the circulating machine is connected with the feed inlet of the compressor through a pipeline, the second outlet of the condenser is connected with the feed inlet of the first-stage flash tank through a pipeline, the third outlet of the condenser is connected with the feed inlet of the first ammonia cooler, the outlet of the first ammonia cooler is connected with the feed inlet of the second ammonia cooler, the outlet of the second ammonia cooler is connected with the feed inlet of the ammonia separator, the first outlet of the ammonia separator is connected with the second feed inlet of the condenser, the second outlet of the ammonia separator is connected with the feed inlet of the first-stage flash tank, the gas outlet of the first-stage flash tank is connected with the feed inlet of the compressor through a pipeline, and the liquid outlet of the first-stage flash tank is connected with the feed inlet of the second-stage flash tank through a pipeline.

2. The hydrogen-ammonia production zero-carbon integrated energy application system based on offshore renewable energy electricity as claimed in claim 1, wherein, The intelligent control module in the offshore energy platform module absorbs the fluctuation in the power output of the renewable energy power module in the following manner: S1, judge renewable energy power module output power P w (t) whether the 1 min and 10 min active power fluctuation limits of grid connection requirements are met, if P w (t) if the standard is met, the output power of the renewable energy power module is directly connected to the grid, if not met, the next step is performed; S2, output power P of the renewable energy power module w (t) n (n = 1) layer wavelet packet decomposition is carried out, according to the characteristics of the power signal, db6 wavelet is used as the wavelet basis of wavelet packet decomposition; S3, reconstructing the decomposed nth layer wavelet coefficients to obtain a low-frequency component S n,0 and a high-frequency fluctuation component S n,i ; S4, judging the low-frequency component S of the n-layer wavelet packet decomposition and reconstruction n,0 whether the technical regulation standard of the renewable energy power module accessing the power system is met, if not, repeating step S2, performing n + 1-layer wavelet packet decomposition, when the fluctuation amplitude limit is met, determining that the optimal number of wavelet packet decomposition is n, and the cycle stops.

3. The hydrogen-ammonia production zero-carbon integrated energy application system based on offshore renewable energy electricity as claimed in claim 2, wherein, The wavelet packet decomposition method of the intelligent control module in the offshore energy platform module is as follows: S21, according to the relevant requirements in the grid connection standard, the allowable range of power fluctuation of the renewable energy power module is determined; S22, judging the renewable energy power module power P w (t) whether the grid-connected index has been met, if not met, requiring to reuse the wavelet packet decomposition to smooth the renewable energy power module power P w (t), gradually deepening the decomposition layer number n; S23, when the P n,0 When the grid-connected requirement is met, n0 is recorded as the optimal decomposition layer number under the fluctuation of the generated power, and P n,0 is recorded as P0(t), P w (t) and the difference between P0(t) are the fluctuation P s (t) in the generated power of the original renewable energy power module, which is also the fluctuation that needs to be absorbed by the renewable energy power module.

4. The hydrogen-ammonia production zero-carbon integrated energy application system based on offshore renewable energy electricity as claimed in claim 3, wherein, In the step S23, P s (t) is the power fluctuation component that is superimposed by a series of power components corresponding to different frequency intervals, which is the component that the renewable energy power module needs to accommodate s (t) is the input power of the offshore energy platform module calculated by amplitude detection and superimposed with a part of the positive power component.

5. The hydrogen-ammonia production zero-carbon integrated energy application system based on offshore renewable energy electricity as claimed in claim 1, wherein, The intelligent control module in the offshore energy platform module optimizes power capacity allocation in the following manner: Step 1: Set the size of the whale population as N using the IWOA algorithm p , the initial population X = [x1, x2, ··· x Np , the maximum number of iterations t max , initialize A, C, a values, where A and C are random parameters, and a is a control parameter; Step 2: Calculate the fitness value of each individual {f(Xi), i = 1, 2, ···, Np} and record the current best individual and position X best ; Step 3: Calculate the convergence factor a according to formula 1, and then update the A and C values according to formula 2 and formula 3; ； Where r is a random number in [0, 1]; Step 4: Perform random difference mutation disturbance on the optimal individual in the current population, and update the current whale individual position according to formula 4; ； wherein X rand is a random whale individual; Step 5: Determine if the iteration number t has reached the maximum value t max If the maximum number of iterations is reached, output the fitness value of the best solution, otherwise return to step 3 to continue execution.

6. The hydrogen-ammonia production zero-carbon integrated energy application system based on offshore renewable energy electricity as claimed in claim 1, wherein, The ammonia synthesis device synthesizes ammonia in the following manner: hydrogen generated by the water electrolysis hydrogen generation device, fresh air and unreacted gas are mixed in the compressor and then transported into the ammonia synthesis tower for hydrogen ammonia synthesis; high-temperature mixed gas obtained after reaction in the ammonia synthesis tower is introduced into the waste heat boiler for waste heat recovery to produce steam; the temperature of the reacted gas is reduced to 190 DEG C, and then the gas is introduced into the heat exchanger from the upper part of the waste heat boiler; the gas temperature is reduced to about 90 DEG C after heat exchange between the gas at the top of the heat exchanger and the gas in the upper heat exchanger tube, and then the gas is introduced into the water cooler; the gas temperature is reduced to about 20 DEG C after the low-temperature gas is introduced into the high-temperature gas, and then the gas is introduced into the after-cooler to further reduce the gas temperature to about 10 DEG C; the gas ammonia in the gas is cooled into a misty liquid ammonia, and then the liquid ammonia is introduced into the condenser; the gas temperature is reduced to about 1 DEG C after heat exchange between the gas and the cold gas from the ammonia separator in the upper heat exchanger tube; the gas is introduced into the cyclone separator in the lower part of the condenser for the first time to separate the liquid ammonia in the gas; most of the liquid ammonia in the gas is separated, and the separated gas and a small amount of liquid ammonia are introduced into the first ammonia cooler and then into the second ammonia cooler to reduce the gas temperature to about -10 DEG C; the liquid ammonia separated from the second ammonia cooler and the condenser is reduced to 5.1 MPa and then introduced into the primary flash tank; most of the hydrogen and nitrogen gas is directly returned to the fresh gas pipeline and introduced into the compressor; the liquid ammonia from the primary flash tank is introduced into the secondary flash tank; the secondary flash tank pressure is 2.5 MPa; the flash gas is introduced into the absorption tower for absorption and then into the boiler system for combustion; the ammonia water is introduced into the boiler flue gas desulfurization system; and the liquid ammonia from the secondary flash tank is introduced into the green ammonia storage tank for storage.

7. The hydrogen-ammonia production zero-carbon integrated energy application system based on offshore renewable energy electricity as claimed in claim 1, wherein, The ammonia hydrogen carrier fuel cell power ship includes a ship body, an ammonia storage module, an ammonia hydrogen production module, a hydrogen supply module and a hydrogen fuel cell, wherein the ammonia storage module includes a green ammonia storage tank, a monitoring system and an emergency exhaust system, the inside of the green ammonia storage tank is kept at room temperature, during the filling of ammonia fuel, the internal pressure is adjusted through the inlet control valve on the green ammonia storage tank to keep it within a safe range at all times, and during the use of ammonia fuel, the outlet pressure can be adjusted through the outlet control valve on the green ammonia storage tank; the ammonia hydrogen production module includes an ammonia decomposition furnace and a gas separation device, the ammonia decomposition furnace adopts a high-temperature electric heating decomposition method to produce ammonia gas, and then the mixed gas after reaction is injected into the gas separation device, the gas separation device separates the ammonia gas that has not reacted in time from the mixed gas, reintroduces it into the ammonia decomposition furnace for reaction, discharges nitrogen into the air, and introduces hydrogen into the hydrogen supply module; the hydrogen supply module includes a hydrogen treatment device and a monitoring device, the hydrogen treatment device purifies, dries and processes the hydrogen produced by the ammonia hydrogen production module to generate hydrogen that meets the purity, pressure and temperature requirements of the hydrogen fuel cell, and the monitoring device is used to monitor whether the hydrogen produced by the hydrogen treatment device meets the purity, pressure and temperature requirements of the hydrogen fuel cell in real time; the hydrogen fuel cell is used to provide power to the ship body.

8. The hydrogen-ammonia production zero-carbon integrated energy application system based on offshore renewable energy electricity as claimed in claim 1, wherein, The hydrogen production and hydrogenation integrated station includes an ammonia cracking reactor, a separation device, a hydrogen purification device, a compression device and a filling device, liquid ammonia is cracked by a high-temperature catalyst or an electric catalytic cracking to generate hydrogen and nitrogen, the separation device and the hydrogen purification device separate and reuse the unconverted ammonia, and the purified hydrogen is compressed to a certain pressure by the compressor and then filled into the vehicle for use or used for fuel cell combustion power generation.

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