A synthetic ammonia system and its load dynamic control method and device

Abstract

The present invention discloses a synthetic ammonia system and a method and device for dynamic load control thereof. The method comprises: predicting the power generation of green electricity generation within a preset time period after the current moment to obtain the predicted power generation; determining the predicted hydrogen production based on the predicted power generation; determining the nitrogen production power and the ammonia synthesis power based on the predicted hydrogen production; controlling the hydrogen production power of the hydrogen production device to operate in accordance with the changes in the real-time power generation of green electricity generation, and controlling the operation of the nitrogen production device and the ammonia synthesis device respectively according to the nitrogen production power and the ammonia synthesis power; if the current hydrogen production is less than the current hydrogen demand of the ammonia synthesis device, controlling the hydrogen storage tank and the hydrogen production device to jointly provide hydrogen. In the present application, the predicted hydrogen production, nitrogen production power, and ammonia synthesis power are determined based on the predicted power generation of green electricity generation, and a hydrogen storage tank is also configured to replenish the hydrogen required for ammonia synthesis, thereby reducing the impact of fluctuations in the green hydrogen source on the stable operation of the ammonia synthesis device and improving the safety and stability of the operation of the synthetic ammonia system.

Description

Technical Field

[0001] The present invention relates to the technical field of synthetic ammonia technology, and in particular to a synthetic ammonia system and a method and device for dynamically controlling its load. Background Art

[0002] Traditional ammonia synthesis processes typically use the energy released by burning coal or natural gas to produce hydrogen, which serves as the source of hydrogen for ammonia synthesis. This stable hydrogen source ensures stable operation of the ammonia synthesis equipment system. However, this process also results in significant carbon dioxide emissions, which is inconsistent with the trend of industrial production towards energy conservation and emission reduction.

[0003] The green ammonia synthesis process utilizes renewable energy sources such as wind and solar power to generate green electricity, which is then used to produce hydrogen in a water electrolysis unit. Ultimately, this hydrogen is used to synthesize ammonia. Due to the inherent time-sensitive nature of renewable energy sources like wind and solar power, and the fact that the hydrogen used in green ammonia synthesis is produced from dynamically fluctuating renewable energy sources that provide energy for water electrolysis, the hydrogen production from water electrolysis fluctuates. This volatility is transmitted downstream in the process, impacting the safety and reliability of the entire green ammonia synthesis system. Summary of the Invention

[0004] The purpose of the present invention is to provide a synthetic ammonia system and a method and device for dynamic load control thereof, which can reduce the impact of dynamic fluctuations of green hydrogen sources on the smooth and safe operation of the entire system to a certain extent.

[0005] To solve the above technical problems, the present invention provides a method for dynamically controlling the load of a synthetic ammonia system, comprising:

[0006] Predicting the amount of green electricity generated within a preset time period after the current moment to obtain a predicted amount of electricity; wherein the green electricity generated is at least one of wind power generation or solar power generation; and the electricity generated by the green electricity generation is used to provide electricity required for hydrogen production by a hydrogen production device;

[0007] Determine the predicted hydrogen production amount of the hydrogen production device according to the predicted power generation amount; determine the nitrogen production power of the nitrogen production device and the ammonia synthesis power of the ammonia synthesis device according to the predicted hydrogen production amount;

[0008] Controlling the hydrogen production power of the hydrogen production device to operate in accordance with the real-time power generation of the green electricity generation, controlling the operation of the nitrogen production device and the ammonia synthesis device according to the nitrogen production power and the ammonia synthesis power, respectively, and monitoring the current hydrogen production of the hydrogen production device in real time;

[0009] If the current hydrogen production is less than the current hydrogen demand corresponding to the operation of the ammonia synthesis device according to the ammonia synthesis power, the hydrogen storage tank and the hydrogen production device are controlled to jointly provide hydrogen for the ammonia synthesis device.

[0010] Optionally, after real-time monitoring of the current hydrogen production of the hydrogen production device, the method further includes:

[0011] If the current hydrogen production is greater than the current hydrogen demand corresponding to the operation of the ammonia synthesis device according to the ammonia synthesis power, the remaining hydrogen produced by the hydrogen production device is charged into the hydrogen storage tank.

[0012] Optionally, when controlling the hydrogen production power of the hydrogen production device to operate in accordance with the real-time power generation of the green electricity generation, and controlling the operation of the nitrogen production device and the ammonia synthesis device respectively according to the nitrogen production power and the ammonia synthesis power, the method further includes:

[0013] monitoring the current hydrogen storage capacity of the hydrogen storage tank;

[0014] If the current hydrogen storage amount in the hydrogen storage tank is greater than the maximum hydrogen storage amount threshold, controlling the ammonia synthesis power of the ammonia synthesis device to increase;

[0015] If the current hydrogen storage amount in the hydrogen storage tank is less than the minimum hydrogen storage amount threshold, the ammonia synthesis device is controlled to be in a hot standby state, and the hydrogen generated by the hydrogen production device is input into the hydrogen storage tank.

[0016] Optionally, controlling the operation of the nitrogen production device and the ammonia synthesis device respectively according to the nitrogen production power and the ammonia synthesis power includes:

[0017] When the ammonia synthesis power growth rate of the ammonia synthesis device is greater than a preset growth rate, the nitrogen production device and the nitrogen storage tank are controlled to jointly provide the nitrogen required for ammonia synthesis to the ammonia synthesis device.

[0018] Optionally, predicting the amount of green power generation within a preset time period after the current moment to obtain the predicted amount of power generation includes:

[0019] Predicting energy fluctuation data of the green electricity generation within the preset time period;

[0020] The preset time period is divided into a plurality of time segments according to the energy fluctuation data; wherein the difference between the maximum value and the minimum value of the energy fluctuation data corresponding to the same time segment is not greater than the set energy difference value;

[0021] The average power generation value corresponding to each of the time segments is predicted based on the energy fluctuation data to obtain the predicted power generation corresponding to each of the time segments.

[0022] Optionally, controlling the hydrogen production power of the hydrogen production device to operate in accordance with the change in the real-time power generation of the green electricity generation includes:

[0023] When the current power generation generated by the green electricity generation is greater than the power required for the hydrogen production device to operate at full load power, the hydrogen production device is controlled to operate at full load power, and the remaining power generated by the green electricity used to provide the power required for the hydrogen production device to operate at full load power is stored in the power storage device.

[0024] Optionally, determining the predicted hydrogen production amount of the hydrogen production device according to the predicted power generation includes:

[0025] When the predicted power generation in a preset section within the preset time period is lower than the minimum power generation, and the preset section is less than a first time threshold, the predicted hydrogen production of the hydrogen production device in the preset section is determined to be the hydrogen production when the hydrogen production device operates at the minimum load power;

[0026] Accordingly, controlling the hydrogen production power of the hydrogen production device to operate in accordance with the change in the real-time power generation of the green electricity generation includes:

[0027] The power storage device and the green electricity generation are controlled to jointly provide electric energy for the hydrogen production device, and the device operates according to the minimum hydrogen production load power.

[0028] Optionally, controlling the hydrogen production power of the hydrogen production device to operate in accordance with the change in the real-time power generation of the green electricity generation, and controlling the operation of the nitrogen production device and the ammonia synthesis device respectively according to the nitrogen production power and the ammonia synthesis power, comprises:

[0029] When the predicted power generation of a preset section within the preset time period is lower than the minimum power generation, and the preset section is greater than or equal to the first time threshold and less than the second time threshold, the hydrogen production device is controlled to be in a hot standby state within the preset section;

[0030] The hydrogen storage tank is controlled to output hydrogen to the ammonia synthesis device, and the ammonia synthesis power of the ammonia synthesis device is controlled to operate at the minimum ammonia synthesis load power.

[0031] A load dynamic control device for a synthetic ammonia system, comprising:

[0032] an electricity prediction module, configured to predict the amount of green electricity generated within a preset time period after the current moment to obtain a predicted amount of electricity; wherein the green electricity generated is at least one of wind power generation or solar power generation; and the electricity generated by the green electricity generation is used to provide the electricity required for hydrogen production by the hydrogen production device;

[0033] a power setting module, configured to determine a predicted hydrogen production amount of the hydrogen production device according to the predicted power generation amount; and determine a nitrogen production power of the nitrogen production device and an ammonia synthesis power of the ammonia synthesis device according to the predicted hydrogen production amount;

[0034] a first control module, configured to control the hydrogen production power of the hydrogen production device to operate in accordance with changes in the real-time power generation of the green electricity generation, and to control the operation of the nitrogen production device and the ammonia synthesis device according to the nitrogen production power and the ammonia synthesis power, respectively, and to monitor the current hydrogen production of the hydrogen production device in real time;

[0035] The second control module is configured to control the hydrogen storage tank and the hydrogen production device to jointly provide hydrogen for the ammonia synthesis device if the current hydrogen production is less than the current hydrogen demand corresponding to the operation of the ammonia synthesis device according to the ammonia synthesis power.

[0036] A synthetic ammonia system, comprising: a main controller, a hydrogen production device, a nitrogen production device, an ammonia synthesis device and a hydrogen storage tank;

[0037] The output ends of the hydrogen production device, the nitrogen production device and the hydrogen storage tank are all connected to the input end of the ammonia synthesis device through pipelines;

[0038] The main controller is used to execute the steps of the method for dynamic load control of a synthetic ammonia system as described in any one of the above items.

[0039] The present invention provides a method and device for dynamic load control of an ammonia synthesis system, and an ammonia synthesis system. The method for dynamic load control of the ammonia synthesis system comprises: predicting the power generation of green electricity generation within a preset time period after a current moment to obtain a predicted power generation; wherein the green electricity generation is at least one of wind power generation or solar power generation; and the electricity generated by the green electricity generation is used to provide the electricity required for hydrogen production by a hydrogen production device; determining a predicted hydrogen production amount of the hydrogen production device based on the predicted power generation; determining a nitrogen production power of a nitrogen production device and an ammonia synthesis power of an ammonia synthesis device based on the predicted hydrogen production; controlling the hydrogen production power of the hydrogen production device to operate in accordance with changes in the real-time power generation of the green electricity generation, controlling the operation of the nitrogen production device and the ammonia synthesis device respectively according to the nitrogen production power and the ammonia synthesis power, and monitoring the current hydrogen production of the hydrogen production device in real time; if the current hydrogen production is less than the current hydrogen demand corresponding to the operation of the ammonia synthesis device according to the ammonia synthesis power, controlling the hydrogen storage tank and the hydrogen production device to jointly provide hydrogen to the ammonia synthesis device.

[0040] In the present application, the power generation of green electricity generation within a preset time period after the current moment is first predicted. After determining the predicted power generation within the preset time period and determining the predicted hydrogen production capacity of the hydrogen production device based on the predicted power generation, the nitrogen production power of the nitrogen production device and the ammonia synthesis power of the ammonia synthesis device are set based on the predicted hydrogen production capacity, thereby reducing the fluctuation of the operation of the ammonia synthesis system to a certain extent. On this basis, a hydrogen storage tank for storing hydrogen is further configured. Therefore, when the real-time hydrogen production capacity of the hydrogen production device fluctuates with the power generation of green electricity generation, when the hydrogen production capacity of the hydrogen production device is insufficient, the hydrogen required for ammonia synthesis is supplemented, thereby reducing the fluctuation amplitude of the operating parameters of the ammonia synthesis device due to the fluctuation of the hydrogen production capacity of the hydrogen production device to a certain extent, which is conducive to improving the smooth operation of the entire ammonia synthesis system and improving the safety and stability of the operation of the ammonia synthesis system. BRIEF DESCRIPTION OF THE DRAWINGS

[0041] In order to more clearly illustrate the embodiments of the present invention or the technical solutions of the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0042] Figure 1 A schematic flow chart of a method for dynamic load control of a synthetic ammonia system provided in an embodiment of the present application;

[0043] Figure 2 A schematic structural diagram of an ammonia synthesis system provided in an embodiment of the present application;

[0044] Figure 3 This is a structural block diagram of a load dynamic control device for a synthetic ammonia system provided by an embodiment of the present invention. DETAILED DESCRIPTION

[0045] The ammonia synthesis reaction requires a certain temperature and pressure. In the green ammonia synthesis process, as the hydrogen production volume fluctuates, the temperature and pressure of the ammonia synthesis reaction will inevitably change. This is inconsistent with the ammonia synthesis reaction's requirement for relatively stable temperature and pressure. In particular, when the hydrogen production volume fluctuates too quickly, the temperature and pressure of the ammonia synthesis reaction are often difficult to control to meet this fluctuation.

[0046] To this end, the present application provides a load dynamic control method, device and ammonia synthesis system for ammonia synthesis system, which can better adapt to the interference of hydrogen source fluctuations on the ammonia synthesis reaction during the ammonia synthesis process, thereby improving the stability and safety of the ammonia synthesis process.

[0047] In order to enable those skilled in the art to better understand the present invention, the present invention is further described in detail below with reference to the accompanying drawings and specific embodiments. Obviously, the embodiments described are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative work are within the scope of protection of the present invention.

[0048] like Figure 1 and Figure 2 As shown, Figure 1 A schematic flow chart of a method for dynamic load control of a synthetic ammonia system provided in an embodiment of the present application; Figure 2 This is a schematic diagram of the structure of the ammonia synthesis system provided in an embodiment of the present application.

[0049] Reference Figure 2 In the synthetic ammonia system of the present application, in addition to the main equipment and devices including a hydrogen production device 2, a nitrogen production device 3 and an ammonia synthesis device 4, a hydrogen storage tank 21 is further provided; wherein the hydrogen production device 2 can specifically be an electrohydrolysis hydrogen production device, and the electric energy required for the hydrogen production process is provided in real time by a green power generation device using wind energy or solar power generation; the gas output ports of the hydrogen production device 2, the nitrogen production device 3 and the hydrogen storage tank 21 are all connected to the gas input port of the ammonia synthesis device 4 through a gas pipeline; as the hydrogen production device 2, the nitrogen production device 3 and the hydrogen storage tank 21 jointly pass hydrogen and ammonia into the ammonia synthesis device 4, the ammonia synthesis device 4 can realize the ammonia synthesis reaction process.

[0050] In a specific embodiment of the present application, the load dynamic control method of the synthetic ammonia system includes:

[0051] S1: predicting the amount of green power generation within a preset time period after the current moment to obtain a predicted amount of power generation.

[0052] Among them, green electricity generation is at least one of wind power generation or solar power generation; and the electricity generated by green electricity generation is used to provide the electricity required for hydrogen production by the hydrogen production device.

[0053] In this embodiment, when predicting the amount of green electricity generated in a period of time after the current moment, it is only necessary to predict the general trend of the amount of electricity generated, and it is not necessary to accurately predict the specific amount of electricity generated at each time point.

[0054] In practical applications, a preset time period (e.g., 8 hours) after the current moment can be divided into several time segments, and the average power generation corresponding to each time segment obtained by prediction is used as the predicted power generation for that time segment. When dividing the time segments, the preset time period can be evenly divided into equal time segments, for example, each time segment is 1 hour, each time segment is 30 minutes, etc.

[0055] In an optional implementation of this embodiment, the process of determining the predicted power generation may include:

[0056] S11: predicting energy fluctuation data of green electricity generation within a preset time period;

[0057] S12: Divide the preset time period into multiple time segments according to the energy fluctuation data; wherein the difference between the maximum value and the minimum value of the corresponding energy fluctuation data within the same time segment is not greater than the set energy difference value;

[0058] S13: predicting the average power generation value corresponding to each time segment based on the energy fluctuation data to obtain the predicted power generation corresponding to each time segment.

[0059] In this embodiment, each time segment can also be divided according to the changes in wind energy and solar energy within a preset time period. For example, the wind speed is relatively high in the first 1 to 3 hours of the preset time period, and it is expected that more electricity will be generated by wind power generation. In the third to sixth hours, the weather is clear, and it is obvious that more electricity will be generated by solar power generation. Therefore, the first 1 to 2 hours of the preset time period can be divided into the same time segment, and the third hour can be a time segment, and the fourth to sixth hours can be a time segment, and the average power generation of each time segment can be predicted. When the wind energy and solar energy in the prediction time period are basically maintained at a relatively stable level, for example, there is no wind and it is cloudy for 8 hours, and the power generation of green electricity generation in the 8 hours is also predicted to be basically maintained at a stable level, then the average power generation of the entire prediction time period can be directly predicted as the predicted power generation.

[0060] Of course, when dividing each time segment, it should be ensured that the corresponding energy fluctuations within the same time segment are not too large, so as to ensure that the subsequent synthetic ammonia power can change with the fluctuations of green electricity generation, and to a certain extent ensure the stability of the synthetic ammonia preparation process.

[0061] In addition, the duration of each time segment should not be too short, for example, it should be kept at least 10 minutes or more than half an hour to avoid excessively frequent changes in the subsequent synthetic ammonia power set for each time segment.

[0062] In addition to being a longer time period of up to 8 hours, the preset time period in this embodiment can also be just a shorter time period. For example, at the current moment, the predicted power generation of green electricity in the time period from the current moment to one hour later can be predicted; after the synthetic ammonia system has been running for one hour, the predicted power generation in the next time period of one hour can be re-predicted; thus, in this embodiment, the power generation of green electricity in the next preset time period can be predicted at intervals of the preset time period, and the operating status of the synthetic ammonia system in the next preset time period can be controlled according to the predicted power generation in the next preset time period (which can also be the average power generation), and the technical solution of the present application can also be implemented.

[0063] In actual applications, the power generation within the preset time period may be predicted using other prediction methods, which are not listed one by one in this embodiment.

[0064] S2: Determine the predicted hydrogen production capacity of the hydrogen production unit based on the predicted power generation; determine the nitrogen production power of the nitrogen production unit and the ammonia synthesis power of the ammonia synthesis unit based on the predicted hydrogen production capacity.

[0065] As described above, in this embodiment, after determining the predicted power generation within a preset time period, it is also possible to determine the amount of hydrogen production that can be supported by the hydrogen production unit based on this predicted power generation, i.e., the predicted hydrogen production capacity. In the ammonia synthesis process, the ratio between the hydrogen and nitrogen amounts is fixed at 1:3. Given a certain hydrogen amount, the amount of ammonia that can be produced is also determined. Therefore, based on this relationship, the nitrogen production power of the nitrogen production unit and the ammonia synthesis power of the ammonia synthesis unit can be determined based on the predicted hydrogen production capacity.

[0066] As described above, when determining the predicted power generation within a forecast time period, the forecast time period can be divided into multiple time segments, and the average power generation for each time segment can be predicted to obtain the predicted power generation for each time segment. The amount of hydrogen produced if all the predicted power generation in each time segment is used for hydrogen production can be used as the predicted hydrogen production for each time segment. Based on this, a stable and unchanging ammonia synthesis power for the ammonia synthesis unit within each time segment is further determined based on the predicted hydrogen production. Correspondingly, the nitrogen production power for the nitrogen generation unit within each time segment is also constant. Obviously, by ensuring that the ammonia synthesis power of the ammonia synthesis unit within each time segment is constant, fluctuations in the operating parameters of the ammonia synthesis unit can be greatly reduced. This, while ensuring that the ammonia synthesis system maximizes the utilization of green electricity, facilitates the stable and safe operation of the integrated ammonia synthesis system.

[0067] The above is an embodiment for an embodiment in which the preset time period corresponds to a relatively long duration; in an embodiment in which the preset time period corresponds to a relatively short duration, the power generation can be predicted once every preset time period, because this method of predicting power generation is close to the current time and the time is short, so a more accurate prediction can often be achieved; therefore, in actual applications, the initial predicted hydrogen production can be determined based on the predicted power generation that fluctuates within the preset time period, and the initial predicted hydrogen production can be subjected to a one-dimensional linear fit to obtain the predicted hydrogen production that changes one-dimensionally over time within the preset time period, and then the corresponding synthetic ammonia power and nitrogen production power are set based on the predicted hydrogen production. The one-dimensional linear fit of the initial predicted hydrogen production can be a piecewise linear fit, that is, the predicted hydrogen production obtained by fitting is a plurality of broken line segments that change over time, or it can be a non-segmented change, which can be determined based on the fluctuation of the initial predicted hydrogen production.

[0068] Using the predicted hydrogen production rate after a one-dimensional linear fit as the basis for determining the ammonia synthesis power can clearly reduce, to a certain extent, the impact of hydrogen production fluctuations on the fluctuations in ammonia synthesis operating parameters. Furthermore, when the slope of the predicted hydrogen production rate after a one-dimensional linear fit is too large, the rate of change in the ammonia synthesis power that fully corresponds to the predicted hydrogen production rate will inevitably also be relatively large. In this case, the ammonia synthesis power can be adjusted to reduce the rate of change, thereby determining an ammonia synthesis power that roughly follows the trend of the predicted hydrogen production rate, thereby further minimizing the impact of hydrogen production fluctuations on the ammonia synthesis process.

[0069] S3: Control the hydrogen production power of the hydrogen production device to operate according to the changes in the real-time power generation of green electricity, and control the operation of the nitrogen production device and the synthetic ammonia device according to the nitrogen production power and the synthetic ammonia power respectively, and monitor the current hydrogen production of the hydrogen production device in real time.

[0070] S4: If the current hydrogen production is less than the current hydrogen demand corresponding to the operation of the ammonia synthesis unit according to the ammonia synthesis power, the hydrogen storage tank and the hydrogen production unit are controlled to jointly provide hydrogen for the ammonia synthesis unit.

[0071] After determining the ammonia synthesis power and nitrogen production power, the hydrogen production unit, nitrogen production unit, and ammonia synthesis unit can be started and operated together; at this time, the hydrogen production power of the hydrogen production unit can be adjusted in full accordance with the real-time changes in the power generation of green electricity, to ensure that the electricity generated by the green electricity generation can be used to the greatest extent possible for nitrogen production in the nitrogen production unit. However, it is obvious that the ammonia synthesis power and nitrogen production power determined based on the predicted power generation at this time do not fully match the current changing hydrogen production power of the hydrogen production unit. In order to ensure the normal operation of the entire ammonia synthesis system, the current hydrogen production of the hydrogen production unit can be monitored in real time. Once the current hydrogen production of the hydrogen production unit is less than the hydrogen production required by the current ammonia synthesis power of the ammonia synthesis unit, the hydrogen storage tank can be controlled to also provide hydrogen to the ammonia synthesis unit at the same time, thereby ensuring the stable operation of the ammonia synthesis unit.

[0072] It is understandable that the real-time hydrogen production capacity of the hydrogen production device fluctuates over time, and the hydrogen production capacity of the hydrogen production device during the period may be less than or greater than the hydrogen capacity currently required by the ammonia synthesis device. To this end, another optional implementation in this embodiment may further include:

[0073] If the current hydrogen production is greater than the current hydrogen demand corresponding to the operation of the ammonia synthesis unit according to the ammonia synthesis power, the remaining hydrogen produced by the hydrogen production unit will be charged into the hydrogen storage tank.

[0074] The hydrogen storage tank in this embodiment can not only replenish hydrogen for the ammonia synthesis device when the hydrogen production capacity of the hydrogen production device is insufficient, but also cache the excess hydrogen when the hydrogen production capacity of the hydrogen production device is excessive; thus, through the mutual cooperation between the hydrogen storage tank and the hydrogen production device, a more stable hydrogen source is provided to the ammonia synthesis device in the subsequent process to a certain extent, which can also improve the stability and safety of the ammonia synthesis device in the ammonia synthesis process to a certain extent.

[0075] On this basis, in another optional embodiment of this embodiment, the normal operation of the hydrogen production device may further include:

[0076] Monitor the current hydrogen storage capacity of the hydrogen storage tank;

[0077] If the current hydrogen storage amount in the hydrogen storage tank is greater than the maximum hydrogen storage amount threshold, the ammonia synthesis power of the ammonia synthesis device is controlled to increase;

[0078] If the current hydrogen storage amount in the hydrogen storage tank is less than the minimum hydrogen storage amount threshold, the synthetic ammonia unit is controlled to be in hot standby state, and the hydrogen produced by the hydrogen production unit is input into the hydrogen storage tank.

[0079] In this embodiment, the amount of hydrogen that can be stored in the hydrogen storage tank is limited. To ensure the safety of the hydrogen storage tank, when the amount of hydrogen stored in the hydrogen storage tank is too large, that is, greater than the maximum hydrogen storage threshold of the hydrogen storage tank, resulting in an excessive pressure in the hydrogen storage tank, it is indicated that no further hydrogen can be added to the hydrogen storage tank, otherwise it will easily cause a safety hazard. In this case, the ammonia synthesis power of the ammonia synthesis unit can be appropriately increased, thereby accelerating the consumption rate of hydrogen by the ammonia synthesis unit, thereby alleviating the problem of the continuous increase in the pressure of the hydrogen storage tank. It can be understood that the maximum hydrogen storage threshold in this embodiment should be less than the maximum hydrogen storage capacity of the hydrogen storage tank; and the hydrogen storage capacity in the hydrogen storage tank is proportional to the pressure. Therefore, the current hydrogen storage capacity can be represented by the pressure in the hydrogen storage tank. Similarly, the maximum hydrogen storage threshold and the minimum hydrogen storage threshold also correspond to the maximum pressure threshold and the minimum pressure threshold.

[0080] There may be an excess of hydrogen in the hydrogen storage tank, and there may also be an insufficient hydrogen reserve. When the remaining hydrogen in the hydrogen storage tank is insufficient, it may be impossible to subsequently replenish hydrogen for the ammonia synthesis process of the ammonia synthesis unit, thereby affecting the normal operation of the ammonia synthesis unit. At this time, the ammonia synthesis unit can be controlled to be in a hot standby state. That is to say, when the amount of hydrogen in the hydrogen storage tank is too little, the operation of the ammonia synthesis unit is suspended first, and all the hydrogen prepared by the hydrogen production unit is first filled into the hydrogen storage tank. When the hydrogen storage amount in the hydrogen storage tank reaches a certain amount, for example, it can be the average of the maximum hydrogen storage threshold and the minimum hydrogen storage threshold, or it can be other hydrogen storage amounts, which are not limited in this embodiment.

[0081] Based on the above discussion, in actual applications, as the hydrogen production capacity of the hydrogen production unit fluctuates, in order to match the fluctuation of the ammonia synthesis power of the ammonia synthesis unit, the nitrogen capacity provided by the nitrogen production unit also needs to change accordingly. In order to better meet the nitrogen demand of the ammonia synthesis unit, in another optional embodiment of the present application, the process of controlling the operation of the nitrogen production unit may further include:

[0082] When the ammonia synthesis power growth rate of the ammonia synthesis unit is greater than the preset growth rate, the nitrogen production unit and the nitrogen storage tank are controlled to jointly provide the nitrogen required for the ammonia synthesis unit.

[0083] The nitrogen generator in the present application can specifically be an air separation nitrogen generator. However, during actual operation, the load power fluctuation range of the air separation nitrogen generator in producing nitrogen is limited. Therefore, when the ammonia synthesis power of the ammonia synthesis unit increases significantly, the nitrogen production capacity of the nitrogen generator is difficult to increase rapidly and significantly. To ensure the normal operation of the ammonia synthesis unit, the nitrogen generator can be equipped with a nitrogen storage tank. Therefore, if the nitrogen production capacity of the nitrogen generator is insufficient, the nitrogen storage tank and the nitrogen generator can be controlled to jointly provide the nitrogen required for ammonia synthesis to the ammonia synthesis unit.

[0084] Similarly, when the ammonia synthesis power reduction rate of the ammonia synthesis unit exceeds a preset reduction rate, excess nitrogen produced by the nitrogen generator (i.e., the remaining nitrogen after providing the nitrogen required by the ammonia synthesis unit) can be stored in the nitrogen storage tank. Similar to the aforementioned hydrogen storage tank, the nitrogen storage tank and nitrogen generator in this embodiment work together to better adapt to the fluctuating ammonia synthesis power of the ammonia synthesis unit and ensure its normal operation.

[0085] To summarize, in this application, the power generation of green electricity generation within a preset time period in the future after the current moment is first predicted. After determining the predicted power generation within the preset time period and determining the predicted hydrogen production of the hydrogen production device based on the predicted power generation, the nitrogen production power of the nitrogen production device and the ammonia synthesis power of the ammonia synthesis device are set based on the predicted hydrogen production, thereby reducing the fluctuation of the operation of the ammonia synthesis system to a certain extent; on this basis, a hydrogen storage tank storing hydrogen is further configured, so that in the process of the real-time hydrogen production of the hydrogen production device fluctuating with the power generation of green electricity generation, when the hydrogen production of the hydrogen production device is insufficient, the hydrogen required for ammonia synthesis is supplemented, thereby reducing the fluctuation range of the operating parameters of the ammonia synthesis device due to the fluctuation of the hydrogen production of the hydrogen production device to a certain extent, which is conducive to improving the smooth operation of the entire ammonia synthesis system and improving the safety and stability of the operation of the ammonia synthesis system.

[0086] Based on the above discussion, the various embodiments described above primarily focus on various fluctuations in hydrogen production capacity within the hydrogen production unit, as well as various scenarios for the nitrogen supply required by the nitrogen production unit to accommodate load power fluctuations within the ammonia synthesis unit. However, in actual applications, green power generation also experiences various fluctuations. These will be explained using specific examples.

[0087] In another optional embodiment of the present application, it may further include:

[0088] When the current power generation generated by green electricity is greater than the power required for the hydrogen production device to operate at full load, the hydrogen production device is controlled to operate at full load power, and the remaining power generated by green electricity is used to provide the power required for the hydrogen production device to operate at full load power and stored in the power storage device.

[0089] Taking the hydrogen production device that produces hydrogen by electrolysis as an example, generally a large number of hydrogen production devices will be configured. When the power generation of green electricity is sufficient, more hydrogen production devices can be started to operate simultaneously to produce hydrogen, which means that the hydrogen production device can operate at high load power (that is, hydrogen production power); when the power generation of green electricity is insufficient, the load power of the hydrogen production device can be reduced.

[0090] To this end, in this embodiment, when the green electricity generation capacity is sufficient, the hydrogen production device can be controlled to operate at full load power, that is, all hydrogen production devices are started at the same time, and the remaining power is stored in the power storage device.

[0091] It is understandable that green electricity generation may have sufficient power generation or insufficient power generation. Therefore, in another optional embodiment of the present application, it may further include:

[0092] When the predicted power generation in a preset section within the preset time period is lower than the minimum power generation, and the preset section is less than the first time length threshold, the predicted hydrogen production of the hydrogen production device in the preset section is determined to be the hydrogen production capacity of the hydrogen production device operating at the minimum load power;

[0093] Accordingly, the hydrogen production power of the hydrogen production device is controlled to operate in accordance with the real-time power generation of green electricity, including:

[0094] The power storage device and green electricity generation are controlled to jointly provide electricity for the hydrogen production device, and operate according to the minimum hydrogen production load power.

[0095] This embodiment further takes into account that in actual applications, there may be certain extreme situations, resulting in extremely low power generation from green electricity generation within a certain sustained period. Obviously, at this time, green electricity generation cannot provide sufficient energy for hydrogen production for the hydrogen production device. At this time, the electric energy stored in the power storage device when green electricity generation is sufficient and the electric energy generated by green electricity can jointly support the low-load power operation of the hydrogen production device; in this process, the hydrogen storage tank can also provide a certain amount of hydrogen for the ammonia synthesis device, thereby ensuring the normal and stable operation of the ammonia synthesis device.

[0096] Based on the above embodiment, in another optional embodiment of the present application, the process of controlling the hydrogen production power of the hydrogen production device to operate in accordance with the change of the real-time power generation of the green electricity generation, and controlling the operation of the nitrogen production device and the ammonia synthesis device respectively according to the nitrogen production power and the ammonia synthesis power may further include:

[0097] When the predicted power generation of a preset section within the preset time period is lower than the minimum power generation, and the preset section is greater than or equal to the first time threshold and less than the second time threshold, the hydrogen production device is controlled to be in a hot standby state within the preset section;

[0098] The hydrogen storage tank is controlled to output hydrogen to the ammonia synthesis device, and the ammonia synthesis power of the ammonia synthesis device is controlled to operate at the minimum ammonia synthesis load power.

[0099] This embodiment further considers that when the power generation of green electricity remains low for a long time, it is difficult to meet the long-term operation of the hydrogen production device even with power supply from the power storage device. In this case, the hydrogen production device can be controlled to stop hydrogen production, that is, to be in a hot standby state; and then the hydrogen storage tank can be directly used to provide the ammonia synthesis device with the hydrogen required for ammonia synthesis. At this time, the ammonia synthesis power of the ammonia synthesis device should obviously not be too high, and can be the minimum ammonia synthesis load power.

[0100] It can be understood that the first time threshold in this embodiment can be set based on the storage capacity of the power storage device. The first time threshold should be the maximum time that the power storage device can continue to function for the hydrogen production device, and the second time threshold is based on the hydrogen storage amount in the hydrogen storage tank. The second time threshold can be the maximum time that the hydrogen storage tank can continue to provide hydrogen to the synthetic ammonia device.

[0101] The following is an introduction to a load dynamic control device for a synthetic ammonia system provided by an embodiment of the present invention. The load dynamic control device for a synthetic ammonia system described below and the load dynamic control method for a synthetic ammonia system described above can be referenced to each other.

[0102] Figure 3 The structural block diagram of the load dynamic control device of the synthetic ammonia system provided by the embodiment of the present invention is shown in FIG. Figure 3 The load dynamic control device of the synthetic ammonia system may include:

[0103] The power prediction module 100 is configured to predict the amount of green electricity generated within a preset time period after the current moment to obtain a predicted amount of power generated; wherein the green electricity generated is at least one of wind power generation and solar power generation; and the electricity generated by the green electricity generation is used to provide the electricity required for hydrogen production by the hydrogen production device;

[0104] The power setting module 200 is configured to determine the predicted hydrogen production capacity of the hydrogen production device according to the predicted power generation capacity; determine the nitrogen production power of the nitrogen production device and the ammonia synthesis power of the ammonia synthesis device according to the predicted hydrogen production capacity;

[0105] A first control module 300 is configured to control the hydrogen production power of the hydrogen production device to change with the real-time power generation of the green electricity generation, and to control the operation of the nitrogen production device and the ammonia synthesis device according to the nitrogen production power and the ammonia synthesis power, respectively, and to monitor the current hydrogen production of the hydrogen production device in real time;

[0106] The second control module 400 is configured to control the hydrogen storage tank and the hydrogen production device to jointly provide hydrogen to the ammonia synthesis device if the current hydrogen production is less than the current hydrogen demand corresponding to the ammonia synthesis device operating at the ammonia synthesis power.

[0107] In an optional embodiment of the present application, the second control module 400 is also used to, after real-time monitoring of the current hydrogen production of the hydrogen production device, charge the remaining hydrogen produced by the hydrogen production device into the hydrogen storage tank if the current hydrogen production is greater than the current required hydrogen amount corresponding to the operation of the ammonia synthesis device according to the ammonia synthesis power.

[0108] In an optional embodiment of the present application, the first control module 300 is further used to monitor the current hydrogen storage capacity of the hydrogen storage tank; if the current hydrogen storage capacity in the hydrogen storage tank is greater than the maximum hydrogen storage capacity threshold, the ammonia synthesis power of the ammonia synthesis device is controlled to increase; if the current hydrogen storage capacity in the hydrogen storage tank is less than the minimum hydrogen storage capacity threshold, the ammonia synthesis device is controlled to be in a hot standby state, and the hydrogen generated by the hydrogen production device is input into the hydrogen storage tank.

[0109] In an optional embodiment of the present application, the first control module 300 is specifically configured to control the nitrogen production device and the nitrogen storage tank to jointly provide the nitrogen required for synthesizing ammonia for the ammonia synthesis device when the ammonia synthesis power growth rate of the ammonia synthesis device is greater than a preset growth rate.

[0110] In an optional embodiment of the present application, the power prediction module 100 is specifically used to predict the energy fluctuation data of the green electricity generation within the preset time period; divide the preset time period into multiple time segments according to the energy fluctuation data; wherein, the difference between the maximum value and the minimum value in the corresponding energy fluctuation data in the same time segment is not greater than the set energy difference; predict the corresponding average power generation value of each time segment according to the energy fluctuation data, and obtain the predicted power generation corresponding to each time segment.

[0111] In an optional embodiment of the present application, the second control module 400 is also used to control the hydrogen production device to operate at full load power when the current power generation generated by the green electricity generation is greater than the power required for the hydrogen production device to operate at full load power, and store the remaining power of the green electricity generation used to provide the power required for the hydrogen production device to operate at full load power in the power storage device.

[0112] In an optional embodiment of the present application, the first control module 300 is further configured to, when the predicted power generation in a preset section within the preset time period is lower than the minimum power generation, and the preset section is less than a first time threshold, determine that the predicted hydrogen production amount of the hydrogen production device in the preset section is the hydrogen production amount when the hydrogen production device operates at the minimum load power;

[0113] Correspondingly, the second control module 400 is specifically used to control the power storage device and the green electricity generation to jointly provide electric energy for the hydrogen production device, and operate according to the minimum hydrogen production load power.

[0114] In an optional embodiment of the present application, the second control module 400 is specifically used to control the hydrogen production device to be in a hot standby state within the preset section when the predicted power generation of the preset section within the preset time period is lower than the minimum power generation, and the preset section is greater than or equal to the first time threshold and less than the second time threshold; control the hydrogen storage tank to output hydrogen to the ammonia synthesis device, and control the ammonia synthesis power of the ammonia synthesis device to operate at the minimum ammonia synthesis load power.

[0115] The load dynamic control device of the synthetic ammonia system of this embodiment is used to implement the aforementioned load dynamic control method of the synthetic ammonia system. Therefore, the specific implementation method of the load dynamic control device of the synthetic ammonia system can be found in the embodiment part of the load dynamic control method of the synthetic ammonia system in the previous text. Its specific implementation method can refer to the description of the corresponding embodiments of each part, which will not be repeated here.

[0116] Reference Figure 2 , the present application also provides an embodiment of a synthetic ammonia system, the synthetic ammonia system comprising: a main controller, a hydrogen production device 2, a nitrogen production device 3, an ammonia synthesis device 4 and a hydrogen storage tank 21;

[0117] The output ends of the hydrogen production device 2, the nitrogen production device 3 and the hydrogen storage tank 21 are all connected to the input end of the ammonia synthesis device 4 through pipelines;

[0118] The main controller is used to execute the steps of the method for dynamic load control of a synthetic ammonia system as described in any one of the above items.

[0119] like Figure 2 As shown, Figure 2 This is a schematic diagram of the structure of the ammonia synthesis system provided in an embodiment of the present application.

[0120] In a specific embodiment of the present application, the synthetic ammonia system may include:

[0121] Green power generation device 1, hydrogen production device 2, nitrogen production device 3, ammonia synthesis device 4, hydrogen storage tank 21 and main controller;

[0122] The green electricity generation device 1 includes at least one of a wind power generation unit and a photovoltaic power generation unit; the green electricity generation device 1 is used to provide electric energy for the hydrogen production device 2;

[0123] The hydrogen production device 2 is used to produce hydrogen using the electricity generated by the green electricity generation device 1;

[0124] The output end of the hydrogen production device 2, the output end of the nitrogen production device 3, and the output end of the hydrogen storage tank 21 are all connected to the input end of the ammonia synthesis device 4 through a gas pipeline. A first hydrogen control valve 211 is provided on the gas pipeline connecting the hydrogen production device 2 and the ammonia synthesis device 4; a second hydrogen control valve 212 is provided on the gas pipeline connecting the hydrogen storage tank 21 and the ammonia synthesis device 4.

[0125] The main controller is connected to the hydrogen production device 2, the nitrogen production device 3, and the ammonia synthesis device 4, and is used to control the startup and operation of the hydrogen production device 2, the nitrogen production device 3, and the ammonia synthesis device 4, and adjust the operating power;

[0126] The main controller is connected to the first hydrogen control valve 211 and the second hydrogen control valve 212 respectively, and is used to control the first hydrogen control valve 211 and the second hydrogen control valve 212 to be opened or closed respectively.

[0127] Reference Figure 2 The ammonia synthesis system of this embodiment includes a green electricity generation device 1 that can generate electricity using new energy sources such as wind energy and solar energy, a hydrogen production device 2 for producing hydrogen, a nitrogen production device 3 for producing nitrogen, and an ammonia synthesis device 4 for synthesizing ammonia using hydrogen and nitrogen. The hydrogen production device 2 and the nitrogen production device 3 are both gas-connected to the ammonia synthesis device 4 through a transmission pipeline, so that the hydrogen and nitrogen produced by the hydrogen production device 2 and the nitrogen production device 3, respectively, can be transmitted to the ammonia synthesis device 4 through the gas transmission pipeline; Figure 2 The direction indicated by the arrow is also the direction of air flow in the conveying pipeline.

[0128] On this basis, the synthetic ammonia system is also equipped with a hydrogen storage tank 21 and a main controller; among them, the green power generation device 1, the hydrogen production device 2, the nitrogen production device 3 and the synthetic ammonia device 4 are all communicatively connected to the main controller, and the start-up, shutdown and operating power of each device are all controlled and regulated by the main controller; in addition, the hydrogen storage tank 21 is also connected to the synthetic ammonia device 4 through a gas pipeline, and a first hydrogen control valve 211 is provided on the gas pipeline connecting the hydrogen production device 2 and the synthetic ammonia device 4, and a second hydrogen control valve 212 is provided on the gas pipeline connecting the hydrogen storage tank 21 and the synthetic ammonia device 4, and the opening and closing of the first hydrogen control valve 211 and the second hydrogen control valve 212 are both controlled by the main controller.

[0129] Therefore, in practical applications, the green electricity generation device 1 can utilize new energy sources such as wind energy and solar energy in the environment to generate electricity, and the generated electricity can be used to power the hydrogen production device 2. The hydrogen production device 2 in this embodiment can specifically be an electrohydrolysis hydrogen production device 2, and the number of the electrohydrolysis hydrogen production devices 2 can be more than 40; and the start and shutdown of each electrohydrolysis hydrogen production device 2 are independently controlled by the main controller; when the power generation of the green electricity generation device 1 is relatively large, the main controller can control a larger number of hydrogen production devices 2 to start and operate; in addition, in some cases, it may also be that the wind energy and solar energy in the environment are very sufficient, so that the green electricity generation device 1 can provide all hydrogen production devices 2 with a surplus of electricity generated on the basis of starting at the same time, and thus, the green electricity generation device 1 can also be electrically connected to a power storage device, and the power storage device is also electrically connected to the hydrogen production device 2; thus, when the electricity generated by the green electricity generation device 1 is sufficient, when all hydrogen production devices 2 are started and operated at the same time, there is still surplus electricity, and the surplus electricity can be stored in the power storage device.

[0130] When the power generation of the green power generation device 1 is relatively small, the main controller can control only a small number of hydrogen production devices 2 to start operation, while the other hydrogen production devices 2 are in a hot standby and non-working state. In addition, the electric energy stored in the above-mentioned power storage device can also provide energy for the hydrogen production device 2 to produce hydrogen when the power generation of the green power generation device 1 is relatively low. The hydrogen production device 2 uses the electric energy generated by the green power generation device 1 to produce hydrogen. The main controller can control the first hydrogen control valve 211 on the gas pipeline between the hydrogen production device 2 and the ammonia synthesis device 4 to open, so that the hydrogen produced by the hydrogen production device 2 can be transported to the ammonia synthesis device 4 through the transmission pipeline together with the nitrogen produced by the nitrogen production device 3, thereby realizing ammonia synthesis.

[0131] As described above, as the power generation of the green electricity generating device 1 fluctuates, the number of hydrogen production devices 2 started to operate also changes accordingly, and the hydrogen production of the hydrogen production device 2 will obviously also change accordingly; the current load power of the ammonia synthesis device 4 and the current hydrogen production of the hydrogen production device 2 may not match. Therefore, in order to minimize the fluctuation and adjustment of the operating parameters of the synthesis device as much as possible, when the current hydrogen production of the hydrogen production device 2 is less than the current amount of hydrogen required for the synthesis of ammonia by the ammonia synthesis device 4, the second hydrogen control valve 212 on the gas pipeline connecting the hydrogen storage tank 21 and the ammonia synthesis device 4 can be further controlled to open, and the opening degree should be proportional to the difference between the amount of hydrogen required by the ammonia synthesis device 4 and the hydrogen production of the hydrogen production device 2.

[0132] Furthermore, considering that the hydrogen production capacity of the hydrogen production device 2 may also be greater than the hydrogen capacity required by the ammonia synthesis device 4; Figure 2In another optional embodiment of the present application, the gas transmission pipeline includes a hydrogen storage transmission pipeline connecting the output end of the hydrogen production device 2 and the input end of the hydrogen storage tank 21; wherein a third hydrogen control valve 213 is provided on the hydrogen storage transmission pipeline;

[0133] The main controller is connected to the third hydrogen control valve 213 and is used to control the third hydrogen control valve 213 to be opened or closed.

[0134] On this basis, in this embodiment, the output end of the hydrogen production device 2 and the input end of the hydrogen storage tank 21 are connected by a hydrogen storage and delivery pipeline, and a third control valve is also provided on the hydrogen delivery pipeline; thus, when the hydrogen production amount of the hydrogen production device 2 is greater than the hydrogen amount required by the ammonia synthesis device 4, the main controller can control the second hydrogen control valve 212 to close and the third hydrogen control valve 213 to open, and the opening degree of the third hydrogen control valve 213 is proportional to the hydrogen production amount of the hydrogen production device 2 and the hydrogen amount required by the ammonia synthesis device 4.

[0135] It can be seen that the hydrogen storage tank 21 in this embodiment can buffer the hydrogen produced by the hydrogen production device 2. When the hydrogen production amount of the hydrogen production device 2 is insufficient, sufficient hydrogen can be supplemented for the synthetic ammonia device 4. When the hydrogen production amount of the hydrogen production device 2 is excessive, the excess hydrogen of the hydrogen production device 2 can be stored, thereby reducing the frequent fluctuations of the synthetic ammonia device 4 with the hydrogen production amount of the hydrogen production device 2 during actual operation, which is beneficial to maintaining the stability and safety of the operation of the entire synthetic ammonia system.

[0136] It is further taken into consideration that as the hydrogen in the hydrogen storage tank 21 is consumed, the air pressure in the hydrogen storage tank 21 also decreases. If the air pressure in the hydrogen storage tank 21 is relatively low, the pressure of the hydrogen discharged directly from the hydrogen storage tank 21 obviously does not meet the ammonia production requirements of the synthetic ammonia device 4. For this reason, the synthetic ammonia system can further include a hydrogen compressor 22 connected to the input end and the output end of the hydrogen storage tank 21, and the output end is connected to the synthetic ammonia device 4; and a hydrogen pressure gauge is provided on the hydrogen storage tank 21; thus, the air pressure in the hydrogen storage tank 21 can be monitored by the hydrogen pressure gauge. If the air pressure in the hydrogen storage tank 21 measured by the hydrogen pressure gauge is relatively small, the main controller can control the start-up of the hydrogen compressor 22, so that the hydrogen in the hydrogen storage tank 21 is compressed by the hydrogen compressor 22 and then output. In addition, the air pressure measured by the hydrogen manometer can also characterize the amount of hydrogen stored in the hydrogen storage tank 21 to a certain extent. Once the air pressure in the hydrogen storage tank 21 is too large, it means that the amount of hydrogen stored in the hydrogen storage tank 21 is too large. The load power of the synthetic ammonia unit 4 can be appropriately increased, thereby increasing the consumption of hydrogen by the synthetic ammonia unit 4; and when the air pressure in the hydrogen storage tank 21 is too small, it means that the amount of hydrogen stored in the hydrogen storage tank 21 is insufficient. The load power of the synthetic ammonia unit 4 can be appropriately reduced, and the synthetic ammonia unit 4 can even be controlled to be in a hot standby state of shutdown, so that a large amount of hydrogen produced by the hydrogen production device 2 is filled into the hydrogen storage tank 21, ensuring that there is sufficient hydrogen stored in the hydrogen storage tank 21.

[0137] Based on the above discussion, refer to Figure 2 In another optional embodiment of the present application, the gas pipeline may specifically include:

[0138] A first hydrogen transmission pipeline 201, a second hydrogen transmission pipeline 202, a third hydrogen transmission pipeline 203, a fourth gas transmission pipeline and a main hydrogen transmission pipeline 205;

[0139] The first end of the first hydrogen pipeline 201 is connected to the output end of the hydrogen production device 2, and the second end of the first hydrogen pipeline 201 is connected to the first end of the main hydrogen pipeline 205; the first hydrogen control valve 211 is provided on the first hydrogen pipeline 201;

[0140] The first end of the second hydrogen transmission pipeline 202 is connected to the output end of the hydrogen storage tank 21, and the second end of the second hydrogen transmission pipeline 202 is connected to the first end of the main hydrogen transmission pipeline 205;

[0141] The first end of the third hydrogen transmission pipeline 203 is connected to the output end of the hydrogen storage tank 21; the second end of the third hydrogen transmission pipeline 203 is connected to the input end of the hydrogen compressor 22;

[0142] The first end of the fourth hydrogen pipeline 204 is connected to the output end of the hydrogen compressor 22, and the second end of the fourth hydrogen pipeline 204 is connected to the first end of the main hydrogen pipeline 205; the second hydrogen control valve 212 is provided on the fourth hydrogen pipeline 204;

[0143] The second end of the main hydrogen transmission pipeline 205 is connected to the input end of the ammonia synthesis device 4;

[0144] A first hydrogen flow meter 221 and a second hydrogen flow meter 222 are respectively provided on the first hydrogen transmission pipeline 201 and the main hydrogen transmission pipeline 205 .

[0145] The gas transmission pipeline in the present application connects two parallel lines for transporting hydrogen to the ammonia synthesis device 4; among them, the first line is the line formed by connecting the output end of the hydrogen production device 2 to the main hydrogen transmission pipeline 205 through the first hydrogen transmission pipeline 201, that is, the line for hydrogen to be transported directly from the hydrogen production device 2 to the ammonia synthesis device 4; the second line is the line formed by connecting from the output end of the hydrogen production device 2 through the hydrogen storage tank 21 and finally through the fourth hydrogen transmission pipeline 204 to the main hydrogen transmission pipeline 205, that is, the line for hydrogen to be transported to the ammonia synthesis device 4 through the hydrogen storage tank 21.

[0146] In addition, a first hydrogen control valve 211 and a second hydrogen control valve 212 are respectively provided on the first hydrogen transmission pipeline 201 and the fourth hydrogen transmission pipeline 204; therefore, when only the hydrogen production device 2 is required to transport hydrogen to the ammonia synthesis device 4, the first hydrogen control valve 211 is controlled to be open, and the second hydrogen control valve 212 is controlled to be closed; conversely, when only the hydrogen storage tank 21 is required to transport hydrogen to the ammonia synthesis device 4, the first hydrogen control valve 211 is controlled to be closed, and the second hydrogen control valve 212 is controlled to be open; and when the hydrogen production device 2 and the hydrogen storage tank 21 are required to transport hydrogen to the ammonia synthesis device 4 at the same time, the first hydrogen control valve 211 and the second hydrogen control valve 212 are opened at the same time.

[0147] In addition, in this embodiment, a first hydrogen flow meter 221 is provided on the first hydrogen transmission pipeline 201. Figure 2 The first hydrogen flowmeter 221 should be set at a position close to the output end of the hydrogen production pipeline. Regardless of whether the hydrogen produced by the hydrogen production device 2 flows directly to the ammonia synthesis device 4 through the first hydrogen transmission pipeline 201 or flows to the hydrogen storage tank 21 through the hydrogen storage transmission pipeline, the hydrogen produced by the hydrogen production device 2 needs to flow through the first hydrogen flowmeter 221. In other words, the first hydrogen flowmeter 221 is used to detect the hydrogen production amount of the hydrogen production device 2; to this end, in actual application, based on the current hydrogen production amount of the hydrogen production device 2 measured by the first hydrogen flowmeter 221, combined with the hydrogen amount required by the ammonia synthesis device 4, it can be determined whether the first hydrogen control valve 211, the second hydrogen control valve 212 and the third hydrogen control valve 213 should be closed or opened respectively.

[0148] On this basis, for the above-mentioned second hydrogen transportation route, the second hydrogen pipeline 202 and the hydrogen compressor 22 are connected in parallel between the output end of the hydrogen storage tank 21 and the first end of the main hydrogen pipeline 205, so that the hydrogen output from the hydrogen storage tank 21 also has two transmission branch routes, so that the hydrogen in the hydrogen storage tank 21 can be directly transported to the main hydrogen pipeline 205 through the second hydrogen pipeline 202, or it can be pressurized by the hydrogen compressor 22 and then transported to the main hydrogen pipeline 205, thereby ensuring that the hydrogen flow from the main hydrogen pipeline 205 has sufficient pressure to drive it to flow into the ammonia synthesis unit 4.

[0149] In practical applications, a fourth hydrogen control valve 214 and a fifth hydrogen control valve 215 can be provided on the second hydrogen transmission pipeline 202 and the third hydrogen transmission pipeline 203, respectively. Thus, when the pressure measured by the hydrogen pressure gauge on the hydrogen storage tank 21 is greater than a pressure threshold, the main controller can control the fourth hydrogen control valve 214 to open and the fifth hydrogen control valve 215 to close. Conversely, when the pressure measured by the hydrogen pressure gauge on the hydrogen storage tank 21 is not greater than the pressure threshold, the main controller can control the fourth hydrogen control valve 214 to close and the fifth hydrogen control valve 215 to open. The pressure threshold should be the minimum pressure that ensures that hydrogen can be automatically driven to flow to the ammonia synthesis unit 4. This is not specifically described in this embodiment.

[0150] In addition, in this embodiment, a second hydrogen flowmeter 222 is provided on the main hydrogen transmission pipeline 205. The second hydrogen flowmeter 222 is used to detect the sum of the hydrogen delivered to the ammonia synthesis unit 4 by the above-mentioned two hydrogen transmission lines. Based on the hydrogen flow rate measured by the hydrogen flowmeter, it can be determined whether the hydrogen flow rates delivered to the ammonia synthesis unit 4 by the above-mentioned two lines meet the requirements of the ammonia synthesis unit 4. If not, the opening, closing and opening size of the first hydrogen control valve 211, the second hydrogen control valve 212, the third hydrogen control valve 213, the fourth hydrogen control valve 214 and the fifth hydrogen control valve 215 can be adjusted to ensure that hydrogen is delivered according to the required flow rate of the ammonia synthesis unit 4; the hydrogen flow rate measured by the second hydrogen flowmeter 222 can also be used as a reference for the amount of nitrogen required by the ammonia synthesis unit 4.

[0151] Based on any of the above embodiments, in another optional embodiment of the present application, the ammonia synthesis system may further include:

[0152] Nitrogen compressor 32 and nitrogen storage tank 31, nitrogen production device 3 includes air separation nitrogen production device;

[0153] The gas pipeline includes a first nitrogen pipeline 301, a second nitrogen pipeline 302, a third nitrogen pipeline 303 and a main nitrogen pipeline 300;

[0154] The output end of the air separation nitrogen production device is connected to the input end of the nitrogen compressor 32 through the first nitrogen transmission pipeline 301; the input end of the nitrogen storage tank 31 is connected to the output end of the nitrogen compressor 32 through the second nitrogen transmission pipeline 302; and the output end of the nitrogen storage tank 31 is connected to the input end of the nitrogen compressor 32 through the third nitrogen transmission pipeline 303.

[0155] The output end of the nitrogen compressor 32 is connected via the main nitrogen delivery pipeline 300;

[0156] The main nitrogen pipeline 300, the second nitrogen pipeline 302 and the third nitrogen pipeline 303 are respectively provided with a first nitrogen control valve 311, a second nitrogen control valve 312 and a third nitrogen control valve;

[0157] The main controller is connected to the first nitrogen control valve 311, the second nitrogen control valve 312 and the third nitrogen control valve respectively, and is used to control the opening and closing of the first nitrogen control valve 311, the second nitrogen control valve 312 and the third nitrogen control valve;

[0158] A nitrogen flow meter 321 is provided on the main nitrogen transmission pipeline 300 .

[0159] The nitrogen generator 3 in this embodiment can specifically be an air separation nitrogen generator, that is, a molecular sieve is used to separate nitrogen from the air. Based on this, this embodiment takes into account that the load power of the ammonia synthesis unit 4 will fluctuate with the hydrogen production capacity of the hydrogen production unit 2. However, if the load power fluctuation of the ammonia synthesis unit 4 is too large, the nitrogen production load power of the air separation nitrogen generator is often difficult to change rapidly accordingly. To this end, the present application further configures the nitrogen generator 3 with a nitrogen storage tank 31 and a nitrogen compressor 32. The nitrogen compressor 32 is directly arranged between the air separation nitrogen generator and the main nitrogen pipeline 300. The nitrogen output from the air separation nitrogen generator can be compressed by the nitrogen compressor 32 before being transported to the main nitrogen pipeline 300, providing power for the nitrogen to be transported to the ammonia synthesis unit 4 through the main nitrogen pipeline 300.

[0160] The input end of the nitrogen storage tank 31 is connected to the output end of the nitrogen compressor 32 through the second nitrogen transmission pipeline 302; the output end of the nitrogen storage tank 31 is connected to the input end of the nitrogen compressor 32 through the third nitrogen transmission pipeline 303; thus, the nitrogen output from the nitrogen compressor 32 can be input into the nitrogen storage tank 31 through the second nitrogen transmission pipeline 302, and the nitrogen output from the nitrogen storage tank 31 can be transported to the nitrogen compressor 32, thereby forming a circulation loop between the nitrogen compressor 32 and the hydrogen storage tank 21. In actual application, if the nitrogen production capacity of the air separation nitrogen production unit is greater than the nitrogen production capacity required by the ammonia synthesis unit 4, the main controller may open the first nitrogen control valve 311 on the main nitrogen transmission pipeline 300, open the first nitrogen control valve 311 on the second nitrogen transmission pipeline 302, and close the third nitrogen control valve on the third nitrogen transmission pipeline 303. In this way, the nitrogen output by the air separation nitrogen production unit can be compressed by the nitrogen compressor 32, and a portion of it can be delivered to the ammonia synthesis unit 4 through the main nitrogen transmission pipeline 300, while the remaining portion can be delivered to the nitrogen storage tank 31 through the second transmission pipeline. When the nitrogen production capacity of the air separation nitrogen production unit is less than the nitrogen production capacity required by the ammonia synthesis unit 4, the main controller may control the first nitrogen control valve 311 to open, the second nitrogen control valve 312 to close, and the third nitrogen control valve to open. In this way, the hydrogen output by the air separation nitrogen production unit and the hydrogen output by the nitrogen storage tank 31 can enter the nitrogen compressor 32 together, be compressed by the nitrogen compressor 32, and then be delivered to the main nitrogen transmission pipeline 300 together.

[0161] As can be seen, in this embodiment, a circulation loop is formed between the nitrogen compressor 32 and the nitrogen storage tank 31, so that the nitrogen can be compressed by the nitrogen compressor 32 before being charged into the nitrogen storage tank 31, thereby increasing the hydrogen storage capacity of the nitrogen storage tank 31. When the nitrogen storage tank 31 outputs nitrogen, the nitrogen can be mixed again with the low-pressure hydrogen from the air separation nitrogen production unit. This can save the power of the nitrogen compressor 32 to compress the mixed nitrogen and ensure that the nitrogen after passing through the nitrogen compressor 32 has sufficient power to flow to the ammonia synthesis unit 4. In this embodiment, the circulation loop formed between the nitrogen compressor 32 and the nitrogen storage tank 31 allows repeated circulation and compression of nitrogen to be achieved with only one set of nitrogen compressors 32, simplifying the structure of the entire framework while ensuring the operational reliability of the entire framework for providing nitrogen.

[0162] In addition, in the present application, a nitrogen flow meter 321 is provided on the main nitrogen pipeline 300. The nitrogen flow rate measured by the nitrogen flow meter 321 is also the total flow rate of nitrogen delivered from the main nitrogen pipeline 300 to the ammonia synthesis unit 4. Based on the flow rate measured by the nitrogen flow meter 321, it can be determined whether the amount of nitrogen delivered to the ammonia synthesis unit 4 meets the demand.

[0163] In addition, a nitrogen pressure gauge can be provided in the hydrogen storage tank 21; the nitrogen storage amount in the nitrogen storage tank 31 can be measured by the nitrogen pressure gauge; once the nitrogen in the nitrogen storage tank 31 is insufficient, the load power of the air separation nitrogen production device can be appropriately increased, and when the nitrogen amount in the nitrogen storage tank 31 is excessive, the load power of the air separation nitrogen production device can be appropriately reduced.

[0164] Furthermore, in order to increase the nitrogen storage capacity in the nitrogen storage tank 31 as much as possible, in another optional embodiment of the present application, the nitrogen storage tank 31 can also be connected to a cooling device, or it can be arranged inside the cooling device, so as to cool the nitrogen in the nitrogen storage tank 31 and even liquefy it, thereby allowing the hydrogen storage tank 21 to store more low-temperature and high-pressure liquefied hydrogen.

[0165] Based on any of the above embodiments, in another optional embodiment of the present application, the ammonia synthesis system may further include:

[0166] The synthesis compressor 41 connected to the input end of the ammonia synthesis device 4 is used to compress the mixed gas of hydrogen and nitrogen and then transport it to the ammonia synthesis device 4.

[0167] Reference Figure 2 The hydrogen delivered through the main hydrogen pipeline 205 and the nitrogen delivered through the main nitrogen pipeline 300 are mixed together and further mixed and compressed by the synthesis compressor 41 before being charged into the ammonia synthesis unit 4, providing power for the mixed gas of nitrogen and hydrogen to flow into the ammonia synthesis unit 4.

[0168] Further optionally, a bypass pipe 42 is connected between the input end of the synthesis compressor 41 and the output end of the synthetic ammonia device 4; a bypass control valve 421 connected to the main controller is provided on the bypass pipe 42; the main controller is used to control the opening of the bypass control valve 421.

[0169] When the load power of the ammonia synthesis unit 4 decreases, resulting in a significant drop in the ammonia synthesis loop pressure, the main controller can control the opening degree of the bypass control valve 421, so that part of the reacted gas enters the circulation section inlet of the synthesis compressor 41 through the bypass pipeline 42, thereby increasing the ammonia content entering the tower and reducing the net ammonia value, thereby increasing the loop pressure of the ammonia synthesis unit 4 when the load of the ammonia synthesis unit 4 remains unchanged.

[0170] To sum up, the synthetic ammonia system in the present application is further equipped with a hydrogen storage tank on the basis of utilizing the green electricity power generation device to provide the energy required for hydrogen production for the hydrogen production device. Therefore, in actual application, when the power generation of green electricity fluctuates and the hydrogen production capacity of the hydrogen production device drops below the hydrogen amount required for the current load power of the synthetic ammonia device, the hydrogen storage tank can be used to provide a certain amount of hydrogen for the synthetic ammonia device, thereby reducing the impact of hydrogen production using the energy provided by the green electricity power generation device on the stable operation of the entire synthetic ammonia system, which is conducive to improving the safety and stability of the operation of the entire synthetic ammonia system.

[0171] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply the existence of any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that the process, method, article or device comprising a series of elements are inherent to the elements. In the absence of further restrictions, the elements limited by the sentence "comprise one..." do not exclude the presence of other identical elements in the process, method, article or device comprising the elements. In addition, the above-mentioned technical solutions provided in the embodiments of the present application are not described in detail in accordance with the corresponding technical solutions in the prior art to achieve the same principle, so as to avoid excessive elaboration.

[0172] This document uses specific examples to illustrate the principles and implementation methods of the present invention. The above examples are only intended to help understand the method and core concept of the present invention. It should be noted that those skilled in the art can make various improvements and modifications to the present invention without departing from the principles of the present invention, and such improvements and modifications also fall within the scope of protection of the claims of the present invention.

Claims

1. A method for dynamic load control of a synthetic ammonia system, characterized in that: include: Predicting the amount of green electricity generated within a preset time period after the current moment to obtain a predicted amount of electricity; wherein the green electricity generated is at least one of wind power generation or solar power generation; and the electricity generated by the green electricity generation is used to provide electricity required for hydrogen production by a hydrogen production device; Determine the predicted hydrogen production capacity of the hydrogen production device based on the predicted power generation; determine the nitrogen production power of the nitrogen production device and the ammonia synthesis power of the ammonia synthesis device based on the predicted hydrogen production; wherein the predicted hydrogen production capacity is the hydrogen production capacity generated by using all the energy of the predicted power generation for hydrogen production, and the ammonia synthesis power is the power corresponding to the ammonia synthesis of the ammonia synthesis device according to the predicted hydrogen production capacity; Controlling the hydrogen production power of the hydrogen production device to operate in accordance with the real-time power generation of the green electricity generation, controlling the operation of the nitrogen production device and the ammonia synthesis device according to the nitrogen production power and the ammonia synthesis power, respectively, and monitoring the current hydrogen production of the hydrogen production device in real time; If the current hydrogen production is less than the current hydrogen demand of the ammonia synthesis device according to the ammonia synthesis power, controlling the hydrogen storage tank and the hydrogen production device to jointly provide hydrogen for the ammonia synthesis device; After real-time monitoring of the current hydrogen production of the hydrogen production device, the method further includes: If the current hydrogen production is greater than the current hydrogen demand corresponding to the operation of the ammonia synthesis device according to the ammonia synthesis power, the remaining hydrogen produced by the hydrogen production device is charged into the hydrogen storage tank; The power generation of green electricity within a preset time period after the current moment is predicted to obtain the predicted power generation, including: Predicting energy fluctuation data of the green electricity generation within the preset time period; The preset time period is divided into a plurality of time segments according to the energy fluctuation data; wherein the difference between the maximum value and the minimum value of the energy fluctuation data corresponding to the same time segment is not greater than the set energy difference value; The average power generation value corresponding to each of the time segments is predicted based on the energy fluctuation data to obtain the predicted power generation corresponding to each of the time segments.

2. The method for dynamic load control of a synthetic ammonia system according to claim 1, wherein: When controlling the hydrogen production power of the hydrogen production device to operate in accordance with the real-time power generation of the green electricity generation, and controlling the operation of the nitrogen production device and the ammonia synthesis device respectively according to the nitrogen production power and the ammonia synthesis power, the method further includes: monitoring the current hydrogen storage capacity of the hydrogen storage tank; If the current hydrogen storage amount in the hydrogen storage tank is greater than the maximum hydrogen storage amount threshold, controlling the ammonia synthesis power of the ammonia synthesis device to increase; If the current hydrogen storage amount in the hydrogen storage tank is less than the minimum hydrogen storage amount threshold, the ammonia synthesis device is controlled to be in a hot standby state, and the hydrogen generated by the hydrogen production device is input into the hydrogen storage tank.

3. The method for dynamic load control of a synthetic ammonia system according to claim 1, wherein: Controlling the operation of the nitrogen production device and the ammonia synthesis device respectively according to the nitrogen production power and the ammonia synthesis power includes: When the ammonia synthesis power growth rate of the ammonia synthesis device is greater than a preset growth rate, the nitrogen production device and the nitrogen storage tank are controlled to jointly provide the nitrogen required for ammonia synthesis to the ammonia synthesis device.

4. The method for dynamic load control of a synthetic ammonia system according to claim 1, wherein: Controlling the hydrogen production power of the hydrogen production device to operate in accordance with the change in the real-time power generation of the green electricity generation includes: When the current power generation generated by the green electricity generation is greater than the power required for the hydrogen production device to operate at full load power, the hydrogen production device is controlled to operate at full load power, and the remaining power generated by the green electricity used to provide the power required for the hydrogen production device to operate at full load power is stored in the power storage device.

5. The method for dynamic load control of a synthetic ammonia system according to claim 4, characterized in that: Determining the predicted hydrogen production amount of the hydrogen production device according to the predicted power generation amount includes: When the predicted power generation in a preset section within the preset time period is lower than the minimum power generation, and the preset section is less than a first time threshold, the predicted hydrogen production of the hydrogen production device in the preset section is determined to be the hydrogen production when the hydrogen production device operates at the minimum load power; Accordingly, controlling the hydrogen production power of the hydrogen production device to operate in accordance with the change in the real-time power generation of the green electricity generation includes: The power storage device and the green electricity generation are controlled to jointly provide electric energy for the hydrogen production device, and the device operates according to the minimum hydrogen production load power.

6. The method for dynamic load control of a synthetic ammonia system according to claim 5, characterized in that: Controlling the hydrogen production power of the hydrogen production device to operate in accordance with the change of the real-time power generation of the green electricity generation, and controlling the operation of the nitrogen production device and the ammonia synthesis device according to the nitrogen production power and the ammonia synthesis power, respectively, including: When the predicted power generation of a preset section within the preset time period is lower than the minimum power generation, and the preset section is greater than or equal to the first time threshold and less than the second time threshold, the hydrogen production device is controlled to be in a hot standby state within the preset section; The hydrogen storage tank is controlled to output hydrogen to the ammonia synthesis device, and the ammonia synthesis power of the ammonia synthesis device is controlled to operate at the minimum ammonia synthesis load power.

7. A load dynamic control device for a synthetic ammonia system, characterized in that: include: an electricity prediction module, configured to predict the amount of green electricity generated within a preset time period after the current moment to obtain a predicted amount of electricity; wherein the green electricity generated is at least one of wind power generation or solar power generation; and the electricity generated by the green electricity generation is used to provide the electricity required for hydrogen production by the hydrogen production device; a power setting module, configured to determine a predicted hydrogen production amount of the hydrogen production device based on the predicted power generation; and determine a nitrogen production power of the nitrogen production device and an ammonia synthesis power of the ammonia synthesis device based on the predicted hydrogen production; wherein the predicted hydrogen production amount is the amount of hydrogen produced if all the energy of the predicted power generation is used for hydrogen production, and the ammonia synthesis power is the power corresponding to the ammonia synthesis device synthesizing ammonia according to the predicted hydrogen production amount; a first control module, configured to control the hydrogen production power of the hydrogen production device to operate in accordance with changes in the real-time power generation of the green electricity generation, and to control the operation of the nitrogen production device and the ammonia synthesis device according to the nitrogen production power and the ammonia synthesis power, respectively, and to monitor the current hydrogen production of the hydrogen production device in real time; a second control module, configured to control the hydrogen storage tank and the hydrogen production device to jointly provide hydrogen to the ammonia synthesis device if the current hydrogen production is less than the current hydrogen demand corresponding to the ammonia synthesis device operating at the ammonia synthesis power; The second control module is further configured to, after real-time monitoring of the current hydrogen production of the hydrogen production device, charge the remaining hydrogen produced by the hydrogen production device into the hydrogen storage tank if the current hydrogen production is greater than the current hydrogen demand corresponding to the operation of the ammonia synthesis device at the ammonia synthesis power; The power prediction module is specifically used to predict the energy fluctuation data of the green electricity generation within the preset time period; divide the preset time period into multiple time segments according to the energy fluctuation data; wherein the difference between the maximum value and the minimum value in the corresponding energy fluctuation data in the same time segment is not greater than the set energy difference; predict the corresponding average power generation value of each time segment according to the energy fluctuation data, and obtain the predicted power generation corresponding to each time segment.

8. A synthetic ammonia system, characterized in that: include: Main controller, hydrogen production unit, nitrogen production unit, ammonia synthesis unit and hydrogen storage tank; The output ends of the hydrogen production device, the nitrogen production device and the hydrogen storage tank are all connected to the input end of the ammonia synthesis device through pipelines; The main controller is used to execute the steps of the load dynamic control method for a synthetic ammonia system according to any one of claims 1 to 6.

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