Offshore wind power single pile hydrogen sulfide intelligent treatment control method and system based on space-time partitioning strategy

Abstract

The invention relates to the technical field of corrosion protection and intelligent operation and maintenance of offshore wind power facilities, and discloses an intelligent treatment and control method and system for hydrogen sulfide of an offshore wind power single pile based on a space-time partitioning strategy. Clustering according to the concentration change modes of the monitoring points under different tidal phases to form an initial risk area, and dividing the initial risk area into treatment subareas uniquely corresponding to spatial and temporal positions in combination with a tidal cycle time process. All the treatment subareas are sequenced according to the hydrogen sulfide exposure equivalent accumulated in the unit tidal period to generate a treatment priority sequence, and the treatment execution unit implements differentiated treatment actions on the corresponding subareas according to the sequence. According to the method, the treatment resource delivery and the hydrogen sulfide corrosion risk are aligned in the space-time dimension, excessive treatment in a low-risk space-time area is avoided, and meanwhile the treatment intensity of a high-risk space-time point is guaranteed.

Description

Technical Field

[0001] This invention relates to the field of corrosion protection and intelligent operation and maintenance technology for offshore wind power facilities, and in particular to an intelligent control method and system for hydrogen sulfide treatment of offshore wind power monopile based on a spatiotemporal partitioning strategy. Background Technology

[0002] Offshore wind turbine monopile foundations are located in an environment at the boundary between the tidal zone and the fully submerged zone. Seabed sediments accumulate at the bottom of the monopile's upstream face, creating an oxygen-deficient microenvironment that promotes the proliferation of sulfate-reducing bacteria, which continuously generate hydrogen sulfide gas. This hydrogen sulfide reacts chemically with the monopile steel, causing localized pitting corrosion and stress corrosion cracking, severely threatening structural safety. Existing remediation methods typically involve uniformly spraying corrosion inhibitors across the entire area or maintaining a constant cathodic protection current, without considering the spatiotemporal heterogeneity of hydrogen sulfide generation.

[0003] Actual monitoring shows that hydrogen sulfide concentration is mainly concentrated spatially at the lower part of the upstream face of the monopile, and exhibits periodic fluctuations strongly correlated with tidal phases. For example, the concentration surges at the end of high tide due to stagnant water flow, while the concentration remains high at the end of low tide due to prolonged sediment exposure. The comprehensive treatment approach continues to consume corrosion inhibitors and electricity in low-risk periods and areas, while insufficient coverage at high-risk times and locations fails to effectively suppress corrosion. This mismatch between treatment actions and corrosion risks in the spatial and temporal dimensions results in high maintenance costs and unstable protective effects. Summary of the Invention

[0004] In view of the aforementioned existing problems, this invention is proposed. This invention provides an intelligent control method and system for hydrogen sulfide treatment of offshore wind power monopile based on a spatiotemporal partitioning strategy, which can solve the problem of resource waste and insufficient protection caused by the mismatch between treatment actions and hydrogen sulfide corrosion risks in the spatiotemporal dimension.

[0005] To solve the above-mentioned technical problems, the present invention provides the following technical solution: In a first aspect, the present invention provides a smart control method for hydrogen sulfide management of offshore wind power monopiles based on a spatiotemporal partitioning strategy, comprising: In response to the need to monitor the risk of hydrogen sulfide corrosion on the surface of offshore wind turbine monopiles, a sequence of hydrogen sulfide concentration data collected from multiple monitoring points deployed on the surface of the monopiles during a continuous tidal cycle was obtained. Determine the concentration change pattern of each monitoring point in the hydrogen sulfide concentration data sequence under different tidal phases, and cluster monitoring points that are spatially adjacent and have similar concentration change patterns to form an initial risk area; The initial risk area is divided into multiple consecutive time segments according to the time process of the tidal cycle, and each initial risk area is divided into several treatment zones with unique spatiotemporal locations based on the specific tidal phase in which the peak hydrogen sulfide concentration occurs within each time segment. The governance zones are numerically sorted according to the hydrogen sulfide exposure equivalent accumulated within a unit tidal cycle to generate a governance priority sequence that reflects the urgency of governance. According to the governance priority sequence, the governance execution unit installed on the surface of the monopile is scheduled to perform governance actions with differentiated configurations of intensity and duration for the corresponding governance zones.

[0006] As a preferred embodiment of the intelligent hydrogen sulfide control method for offshore wind power monopile based on spatiotemporal partitioning strategy described in this invention, wherein: the initial risk area is divided into multiple consecutive time segments according to the tidal cycle, including: In response to the need to divide the natural rhythm of the tidal cycle, each tidal cycle is divided into four consecutive time segments: the early stage of high tide, the late stage of high tide, the early stage of low tide, and the late stage of low tide. Determine the average hydrogen sulfide concentration and the direction of the slope of concentration change for each monitoring point within the four consecutive time segments. Monitoring points with the same slope of concentration change and similar average hydrogen sulfide concentrations are grouped into the same initial risk area.

[0007] As a preferred embodiment of the intelligent hydrogen sulfide control method for offshore wind power monopiles based on a spatiotemporal partitioning strategy described in this invention, the step of numerically sorting each control partition according to the accumulated hydrogen sulfide exposure equivalent within a unit tidal cycle includes: In response to the need to identify the abnormal increase in hydrogen sulfide concentration at the end of high tide, peak hydrogen sulfide concentration data of each treatment zone at the end of high tide were extracted. Zones with peak hydrogen sulfide concentrations significantly higher than the historical average for the same period were identified as high-instantaneous-risk zones. The treatment priority of the high instantaneous risk zone is raised to the top of the current treatment priority sequence, and the corrosion inhibitor injection device is triggered to perform a single pulse high-concentration spray operation on the corresponding treatment zone.

[0008] As a preferred embodiment of the intelligent hydrogen sulfide control method for offshore wind power monopiles based on a spatiotemporal partitioning strategy described in this invention, the step of numerically sorting each control partition according to the accumulated hydrogen sulfide exposure equivalent within a unit tidal cycle includes: In response to the need to identify the persistently high hydrogen sulfide concentration during the late stage of low tide, the duration of hydrogen sulfide concentration above the baseline level in each treatment zone during the late stage of low tide was statistically analyzed. Zones with a high proportion of the total duration of a single tidal cycle and a duration of hydrogen sulfide concentration above the baseline level are identified as zones of persistent corrosion. The treatment priority of the continuously corroded zone is maintained at the top of the treatment priority sequence, and the local cathodic protection anode unit deployed in the corresponding spatial location of the treatment zone is activated to increase the protection current density of the spatial location.

[0009] As a preferred embodiment of the intelligent hydrogen sulfide control method for offshore wind power monopiles based on a spatiotemporal partitioning strategy described in this invention, the control priority sequence includes: In response to the need for dynamic updates to the governance zones, the hydrogen sulfide exposure equivalent values ​​for each governance zone within the current tidal cycle are obtained. Zones where hydrogen sulfide exposure equivalent values ​​have been lower than the historical average exposure equivalent level for multiple consecutive tidal cycles are identified as low-risk zones. Remove the low-risk partition from the current governance priority sequence and suspend power and material supply to the governance execution unit corresponding to the low-risk partition.

[0010] As a preferred embodiment of the intelligent hydrogen sulfide control method for offshore wind power monopile based on spatiotemporal partitioning strategy described in this invention, wherein: the scheduling and installation of the control execution unit on the surface of the monopile implements control actions with differentiated intensity and duration configurations for the corresponding control zones, including: In response to the control requirements for the spatial pointing accuracy of the governance execution unit, the azimuth range of each governance zone on the surface of a single pile is obtained; The nozzles installed in the circumferential direction of the single pile are designated as the dedicated execution nozzles for the corresponding treatment zones, with the nozzles whose spray centerline azimuth angle falls within the azimuth angle range. The rotation angle of the dedicated execution nozzle is locked to the center position of the azimuth range, and the opening duration and injection flow rate of the nozzle are adjusted according to the position of the governance zone in the governance priority sequence.

[0011] As a preferred embodiment of the intelligent hydrogen sulfide control method for offshore wind power monopiles based on a spatiotemporal partitioning strategy described in this invention, wherein: the hydrogen sulfide exposure equivalent includes: In response to the need for quantitative calculation of hydrogen sulfide exposure equivalent, the hydrogen sulfide concentration values ​​and the duration of the corresponding time segments for each governance zone in all time segments within a single tidal cycle are obtained. The hydrogen sulfide exposure contribution value for each time segment is determined to be the product of the hydrogen sulfide concentration value of that time segment and the duration of that time segment; The total hydrogen sulfide exposure equivalent for the governance zone within a single tidal cycle is obtained by summing the hydrogen sulfide exposure contributions from all time segments.

[0012] As a preferred embodiment of the intelligent hydrogen sulfide control method for offshore wind power monopile based on a spatiotemporal partitioning strategy described in this invention, wherein: the control partitioning includes: In response to the need to determine the conditions for merging adjacent governance zones, the hydrogen sulfide exposure equivalent values ​​of any two spatially adjacent governance zones are obtained. Determine the case where the absolute value of the difference between the hydrogen sulfide exposure equivalent values ​​of two spatially adjacent treatment zones is less than the average exposure equivalent value of the two zones. Two spatially adjacent governance zones that meet this condition are merged into a new governance zone. The spatial extent of the new governance zone is the union of the spatial extents of the two original governance zones, and the hydrogen sulfide exposure equivalent of the new governance zone is the arithmetic mean of the exposure equivalents of the two original governance zones.

[0013] As a preferred embodiment of the intelligent hydrogen sulfide control method for offshore wind power monopile based on spatiotemporal partitioning strategy described in this invention, the step of acquiring hydrogen sulfide concentration data sequences collected from multiple monitoring points deployed on the surface of the monopile during continuous tidal cycles includes: In response to the need to ensure the integrity of the spatial coverage of hydrogen sulfide distribution on the surface of a monopile, multiple hydrogen sulfide sensors are deployed on the upstream side, downstream side, port side, and starboard side of the monopile to form a monitoring point array. Each hydrogen sulfide sensor is required to collect hydrogen sulfide concentration data at fixed time intervals during the tidal cycle and upload it to the central processing unit. All hydrogen sulfide concentration data uploaded by hydrogen sulfide sensors are structured and stored according to the spatial location of the monitoring points and the collection timestamp, forming a multidimensional hydrogen sulfide concentration data sequence set.

[0014] Secondly, the present invention provides an intelligent control system for hydrogen sulfide treatment of offshore wind power monopile based on a spatiotemporal partitioning strategy, comprising: a monitoring module, which, in response to the monitoring needs for the risk of hydrogen sulfide corrosion on the surface of offshore wind power monopile, acquires a sequence of hydrogen sulfide concentration data collected from multiple monitoring points deployed on the surface of the monopile during a continuous tidal cycle. The partitioning module determines the concentration change pattern of each monitoring point in the hydrogen sulfide concentration data sequence under different tidal phases, and clusters monitoring points that are spatially adjacent and have similar concentration change patterns to form an initial risk area. Then, the initial risk area is divided into a treatment partition with a unique spatiotemporal location according to the tidal cycle. The sorting module sorts each governance zone according to the cumulative hydrogen sulfide exposure equivalent within a unit tidal cycle, generating a governance priority sequence that reflects the urgency of governance. The scheduling module, based on the governance priority sequence, controls the governance execution unit installed on the surface of the monopile to perform governance actions with differentiated configurations of intensity and duration for the corresponding governance zones.

[0015] Compared with existing technologies, the beneficial effects of this invention are that it proposes an intelligent hydrogen sulfide control method and system for offshore wind power monopiles based on a spatiotemporal partitioning strategy. This method acquires hydrogen sulfide concentration data sequences from multiple monitoring points on the monopile surface during continuous tidal cycles. It then clusters these data based on the concentration change patterns of each monitoring point under different tidal phases to form initial risk areas. These initial risk areas are further divided into uniquely corresponding spatiotemporally located treatment zones based on the tidal cycle's temporal progression. Each treatment zone is ranked according to the accumulated hydrogen sulfide exposure equivalent within a unit tidal cycle to generate a treatment priority sequence. The treatment execution unit then implements differentiated treatment actions for the corresponding zones based on this sequence. This method aligns treatment resource delivery with hydrogen sulfide corrosion risk in the spatiotemporal dimension, avoiding over-treatment in low-risk spatiotemporal areas while ensuring treatment intensity at high-risk spatiotemporal points. Attached Figure Description

[0016] To more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings used in the following description of the embodiments will be briefly introduced. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0017] Figure 1 The present invention provides a flowchart of a method for intelligent control of hydrogen sulfide in offshore wind power monopile based on a spatiotemporal partitioning strategy, which is an embodiment of the present invention.

[0018] Figure 2 This is a flowchart illustrating the key judgment process in the priority ranking of a smart control method for hydrogen sulfide treatment of offshore wind power monopile based on a spatiotemporal partitioning strategy, provided as an embodiment of the present invention. Detailed Implementation

[0019] To make the above-mentioned objects, features, and advantages of the present invention more apparent and understandable, specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of the present invention, and not all of them. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort should fall within the protection scope of the present invention.

[0020] Example 1 Reference Figures 1-2 This is the first embodiment of the present invention, which provides a smart control method for hydrogen sulfide management of offshore wind power monopiles based on a spatiotemporal partitioning strategy, comprising: It should be noted in advance that some numerical descriptions such as thresholds and upper and lower limit preset thresholds appearing in the specific implementation methods can be obtained based on the actual operational needs of relevant personnel and some existing technologies. It is understood that the thresholds and upper and lower limit preset thresholds required for different experimental scenarios are generally different. This invention focuses on the processing of method logic rather than the limitation of specific values. This part will not be elaborated on in the following sections.

[0021] This invention provides a method that can effectively solve the problems mentioned above. The following will describe in detail how to implement the intelligent control method for hydrogen sulfide treatment of offshore wind power monopile based on spatiotemporal partitioning strategy in conjunction with several embodiments. Figure 1 A flowchart illustrating a method for intelligent control of hydrogen sulfide in offshore wind power monopiles based on a spatiotemporal partitioning strategy is shown, including: S1, in response to the monitoring needs of hydrogen sulfide corrosion risk on the surface of offshore wind turbine monopile, acquires hydrogen sulfide concentration data sequences collected from multiple monitoring points deployed on the surface of the monopile during continuous tidal cycles. It should be noted that in this embodiment, the abstract operation and maintenance objective of monitoring the risk of hydrogen sulfide corrosion on the surface of offshore wind turbine monopile will be structurally analyzed to identify the spatial coverage, temporal resolution and data accuracy requirements implicit in the objective, and multi-source sensing commands will be generated in combination with the physical structural characteristics of the offshore wind turbine monopile.

[0022] Furthermore, a structured data acquisition task framework is constructed based on the requirements analysis results, mapping the monitoring requirements into specific sensor activation instruction sets. These sensor activation instruction sets include sensor deployment orientation, sampling frequency, and communication protocol. Simultaneously, the surface of a single pile is mapped into a specific geometric coordinate system range, and the continuous tidal cycle is mapped into a time window parameter with the tidal cycle length as the unit, forming a complete acquisition configuration expression.

[0023] Furthermore, the data collection configuration expressions are converted into task scheduling scripts that conform to the execution syntax of edge computing nodes, and the script templates are filled in according to the mapping relationship; Furthermore, the script is validated for integrity before being distributed to prevent data interruption due to missing instructions, and then the data acquisition task is registered in the task queue of the central processing unit.

[0024] For example, in an offshore wind farm operation and maintenance scenario, when the operation and maintenance system requests comprehensive monitoring of the hydrogen sulfide corrosion risk in the tidal range of a single pile, the system resolves the spatial range to the circumferential surface from 5 meters above the waterline to 10 meters below the waterline of the single pile, with a time resolution of once every 5 minutes. Then, it generates the corresponding multi-point synchronous acquisition command and starts execution at the beginning of the next tidal cycle.

[0025] The tidal cycle length, sampling frequency, and spatial height range mentioned in this section can be set according to the actual needs of relevant technical personnel, and are not limited in this invention.

[0026] In some embodiments, acquiring hydrogen sulfide concentration data sequences collected from multiple monitoring points deployed on the surface of a single pile during a continuous tidal cycle specifically includes steps S11-S13, wherein: S11, in response to the requirement of ensuring the integrity of the spatial coverage of hydrogen sulfide distribution on the surface of the monopile, multiple hydrogen sulfide sensors are deployed on the upstream side, downstream side, port side and starboard side of the monopile to form a monitoring point array. The monitoring point array is a spatial distribution set of hydrogen sulfide sensors covering key areas of the single pile surface.

[0027] It should be noted that the monitoring point array provides the central processing unit with a spatial distribution view of hydrogen sulfide concentration on the surface of a single pile. However, due to the severe sediment accumulation on the upstream side of the single pile under the action of ocean currents, the strong scouring of the downstream side, the different corrosion modes on the port and starboard sides affected by vortex-induced vibration, and the significant differences in the hydrogen sulfide generation mechanism in the four directional regions, if the monitoring points are only concentrated on one side, it will be impossible to capture the risk distribution in the entire circumference.

[0028] Therefore, if multiple hydrogen sulfide sensors are not installed on the upstream and downstream sides, port and starboard sides of the monopile, the central processing unit will be unable to obtain representative omnidirectional corrosion risk data.

[0029] The sensor models used in the actual implementation of this invention include electrochemical H2S sensors and optical absorption H2S sensors.

[0030] For example, in an offshore wind turbine monopile with a diameter of 8 meters, the monitoring point array includes 4 sensors deployed on the upstream side, 3 sensors deployed on the downstream side, 3 sensors deployed on the port side, and 3 sensors deployed on the starboard side, for a total of 13 monitoring points. Each sensor is installed in layers at 2-meter intervals along the vertical direction, covering the main corrosion zone of the tidal range. At this time, when sulfate-reducing bacteria on the seabed proliferate in large quantities at the bottom of the upstream side, if a sufficient density of sensors is not deployed on the upstream side, it will be impossible to accurately identify the high-concentration hydrogen sulfide accumulation area, and it will also be impossible to provide effective input for subsequent initial risk area clustering.

[0031] Therefore, after responding to monitoring needs, it is necessary to determine the sensor layout scheme in the monitoring point array based on the principle of four-quadrant division of the single pile circumference. The frontal surface is a semi-cylindrical area facing the main flow direction, the backal surface is a semi-cylindrical area facing away from the main flow direction, and the port and starboard sides are two quarter-cylindrical areas perpendicular to the flow direction. The four-quadrant layout scheme set in this invention is to ensure that the subsequent concentration change pattern clustering has complete spatial dimension information.

[0032] The number of sensors in each direction, the vertical installation interval, and the coverage height range mentioned in this section can be set according to the actual needs of relevant technical personnel, and this invention does not impose any limitations.

[0033] S12, determine that each hydrogen sulfide sensor collects hydrogen sulfide concentration data at fixed time intervals during the tidal cycle and uploads it to the central processing unit; Understandably, in the actual deployment scenario of hydrogen sulfide monitoring for offshore wind power monopile, sensor nodes are limited by battery power capacity and underwater communication bandwidth. If an adaptive high-frequency sampling strategy is adopted, it is difficult to simultaneously ensure data integrity and equipment lifespan.

[0034] When the current tidal phase is detected to be in the early stage of high tide, it indicates that the water flow velocity is low and the hydrogen sulfide concentration changes slowly. At this time, a fixed low-frequency sampling strategy should be maintained, such as sampling once every 10 minutes, in order to reduce power consumption and extend the equipment operation cycle.

[0035] Conversely, if the current tidal phase is detected to be at the end of high tide, it indicates that the water flow is stagnant and the concentration of hydrogen sulfide may accumulate rapidly. In theory, the sampling frequency should be increased to once every minute. However, since the existing sensor firmware does not support dynamic sampling rate switching, fixed interval sampling is still used, and information loss is made up by subsequent data interpolation.

[0036] When the tidal phase is in the late stage of ebb tide, the current fixed sampling strategy is maintained and the local caching mechanism is activated to avoid data loss due to communication interruption.

[0037] For example, in a sea area with a tidal cycle of 12.4 hours in winter, the hydrogen sulfide sensor uploads data at a fixed interval of 5 minutes, generating 298 records per day. When a storm surge causes a 2-hour communication interruption, the local SD card caches 24 data records, which are automatically re-uploaded after communication is restored, ensuring the integrity of the continuous tidal cycle data sequence.

[0038] The sampling time interval, buffer capacity, and number of communication retransmissions mentioned in this section can be set according to the actual needs of relevant technical personnel, and are not limited in this invention.

[0039] S13. All hydrogen sulfide concentration data uploaded by hydrogen sulfide sensors are structured and stored according to the spatial location of the monitoring points and the collection timestamp, forming a multidimensional hydrogen sulfide concentration data sequence set.

[0040] Understandably, all hydrogen sulfide concentration data uploaded by hydrogen sulfide sensors are bound to key-value pairs according to the spatial location identifier of the monitoring point and the collection timestamp to generate structured data records.

[0041] Furthermore, in the time series database of the central processing unit, a multi-dimensional index is constructed. This can be done by creating an independent time series table for each monitoring point or by constructing a unified three-dimensional tensor structure. Memory caches are allocated preferentially for high-frequency access monitoring points on the tidal surface, and the data is segmented and stored according to the tidal cycle boundary. For example, the daily cutoff is taken from 00:00 of the current day to 00:00 of the next day, and the high tide and low tide times are used as sub-cycle markers. Furthermore, each record is labeled with a unique identifier, including the source sensor ID, azimuth quadrant label, and elevation level number, forming a multidimensional hydrogen sulfide concentration data sequence set. This ensures that the data is unconfused and supports joint queries by spatial location and time window. Here, existing time-series database technology can be used to store the data according to their respective spatiotemporal attributes, and no restrictions are imposed.

[0042] The data segmentation granularity, cache allocation ratio, and elevation level division interval mentioned in this section can be set according to the actual needs of relevant technical personnel, and are not limited in this invention.

[0043] S2, determine the concentration change pattern of each monitoring point in the hydrogen sulfide concentration data sequence under different tidal phases, and cluster monitoring points that are spatially adjacent and have similar concentration change patterns to form an initial risk area; It should be noted that the purpose of step S2 is to extract the core pattern that can characterize the dynamic characteristics of corrosion risk from the continuously collected multidimensional hydrogen sulfide concentration data sequence, and to construct a risk area with physical significance based on this pattern.

[0044] Specifically, time-frequency domain feature analysis can be performed on the original concentration time series of each monitoring point to extract key dynamic attributes of the original concentration time series of each monitoring point within a complete tidal cycle or multiple consecutive tidal cycles. The key dynamic attributes include, but are not limited to, the relative time offset of the concentration peak, the average rate of change of the concentration rising / falling edge, the dominant frequency component of the concentration fluctuation, and the cumulative duration of the concentration above the high-risk threshold.

[0045] Furthermore, to achieve effective spatial clustering, the physical proximity and pattern similarity of monitoring points need to be considered comprehensively. The system first constructs a spatial adjacency diagram based on the geometric coordinates of the monitoring points on the surface of a single pile, clarifying which monitoring points belong to the spatially adjacent category. The geometric coordinates mentioned here refer to azimuth and elevation.

[0046] Building upon this, density-based or hierarchical clustering algorithms, such as DBSCAN (Density-Based Spatial Clustering of Applications with Noise) or agglomerative hierarchical clustering, are further employed to group spatially adjacent monitoring points whose concentration change pattern fingerprints exceed a preset similarity metric into the same set. The preset similarity metric mentioned here can be Dynamic Time Warped Distance (DTW) or cosine similarity.

[0047] It should be noted that the resulting set is an initial risk area. The monitoring points within it are not only physically close to each other, but also show a high degree of consistency in the dynamic behavior of hydrogen sulfide concentration with tidal changes. This indicates that it may be affected by similar local marine environments, thus facing homogeneous corrosion risks. The local marine environmental influences mentioned in this invention include factors such as sediment distribution, water flow scouring intensity, and microbial activity.

[0048] It should also be noted that the formation of the initial risk area in this step provides a structured and pattern-consistent spatial unit basis for subsequent spatiotemporal fine segmentation based on accurate tidal phase information (i.e., subsequent step S3).

[0049] S3, the initial risk area is divided into multiple consecutive time segments according to the time process of the tidal cycle, and each initial risk area is divided into several governance zones with unique spatiotemporal locations based on the specific tidal phase in which the peak hydrogen sulfide concentration occurs within each time segment. Among them, the treatment zone is a single pile surface corrosion treatment unit with a unique spatiotemporal identifier.

[0050] It should be noted that the treatment zoning provides a precise spatial and temporal basis for the corrosion inhibitor spraying system and the cathodic protection system. Since the initial risk area may exhibit multi-peak characteristics in the time dimension, such as the appearance of hydrogen sulfide concentration peaks at the end of high tide and low tide, and the corrosion mechanisms corresponding to the two peaks are different, targeted treatment cannot be implemented if the time dimension is not subdivided.

[0051] Therefore, if the initial risk area is not segmented according to the tidal cycle time process, the central processing unit cannot distinguish the differences in governance needs of the same spatial area under different tidal phases. In actual implementation of this invention, the segmentation criteria include the time of concentration peak occurrence and its duration.

[0052] For example, in the initial risk area of ​​a certain upstream surface, the hydrogen sulfide concentration reaches a peak of 5.2 ppm at the end of the high tide and lasts for 40 minutes, and reaches a peak of 3.8 ppm at the end of the low tide and lasts for 70 minutes. If the system is not divided into time segments, it can only apply a single intensity of corrosion inhibitor spray, which cannot take into account the different risk levels of the two time periods.

[0053] Therefore, after obtaining the initial risk area, it is necessary to divide the initial risk area according to the time process of the tidal cycle.

[0054] In practice, a combined strategy of peak phase positioning and time window binding can be used to achieve accurate generation of governance partitions. For example, the peak concentration moment within each time segment can be used as the governance event anchor point, and an independent governance execution period can be assigned to each anchor point, such as extending 15 minutes before and after the peak moment as the governance window.

[0055] For example, the concentration peak data of the initial risk area in the four tidal phases can be analyzed first. For instance, in the aforementioned upstream region, the system identifies a significant peak at the end of the high tide phase and another significant peak at the end of the low tide phase.

[0056] Furthermore, based on the time boundaries of the tidal phase stages, the initial risk area is divided into four sub-intervals on the time axis. For example, the system divides the 12.4-hour tidal cycle into four phases: 0 to 3.1 hours for the initial high tide phase, 3.1 to 6.2 hours for the final high tide phase, 6.2 to 9.3 hours for the initial low tide phase, and 9.3 to 12.4 hours for the final low tide phase.

[0057] Furthermore, we checked whether there were any events in each sub-interval where the concentration peak exceeded the baseline level by 1.5 times. For example, the peak value of 5.2 ppm at the end of high tide exceeded the baseline level of 2.0 ppm by 1.5 times, and the peak value of 3.8 ppm at the end of low tide also exceeded the baseline.

[0058] Furthermore, the Cartesian product operation is performed on the spatial range of the sub-interval with significant peak values ​​and the initial risk area to generate a governance partition that uniquely corresponds to the spatiotemporal location. The final determined governance partitions include the upstream face-late tide governance partition and the upstream face-late tide governance partition.

[0059] Among them, the baseline level is the 75th percentile value of hydrogen sulfide concentration in the same historical period; the significant peak value is the maximum concentration value that exceeds the baseline level by more than 1.5 times; and the governance zone with a unique spatiotemporal location is a governance unit defined by a fixed spatial range and a fixed time segment.

[0060] The benchmark level multiple, governance window extension duration, and tidal phase division ratio mentioned in this section can be set according to the actual needs of relevant technical personnel, and are not limited in this invention.

[0061] In other possible embodiments, dividing the initial risk area into multiple consecutive time segments according to the tidal cycle specifically includes the following steps, wherein: S31, in response to the need to divide the natural rhythm of the tidal cycle, divides each tidal cycle into four consecutive time segments: the early stage of high tide, the late stage of high tide, the early stage of low tide, and the late stage of low tide. It should be noted that, from the perspective of ocean tidal dynamics, the tidal cycle not only reflects the periodic rise and fall of sea level, but also directly reflects the rhythmicity of sulfate-reducing bacteria metabolic activity in the pore water of seabed sediments. Generally, when the tide is at the end of the high tide phase, such as when the sea level stops rising and is about to recede, the water flow around the pile stagnates, dissolved oxygen is depleted, and the activity of sulfate-reducing bacteria reaches its maximum. This activity is reflected in the hydrogen sulfide concentration time series as a steep upward trend.

[0062] It is easy to understand that this invention, by dividing the tidal cycle into four consecutive time segments, can transform the originally continuous tidal process into discrete analytical units with clear physical meaning. However, when performing this discretization operation of a continuous process, the asymmetry of the actual tidal waveform needs to be taken into account. For example, in some sea areas, the high tide duration is short while the low tide duration is long.

[0063] If the tidal cycle is divided into four consecutive time segments—the initial stage of high tide, the final stage of high tide, the initial stage of low tide, and the final stage of low tide—it indicates that the tidal process has been structured into an analyzable set of stages. This may support the staged extraction of subsequent concentration change patterns. In this case, the present invention uses a fixed four-part method to ensure that all monitoring points use a unified time reference system.

[0064] In this invention, the initial stage of high tide refers to the time interval during which the tide level rises from the lowest point to half the tide level; the final stage of high tide refers to the time interval during which the tide level rises from half the tide level to the highest point; the initial stage of low tide refers to the time interval during which the tide level falls from the highest point to half the tide level; and the final stage of low tide refers to the time interval during which the tide level falls from half the tide level to the lowest point. The four-part division ratio is an empirical time allocation rule, which can be set by relevant technicians according to the requirements of the actual scenario. This invention does not limit this setting.

[0065] S32, determine the average hydrogen sulfide concentration and the direction of the concentration change slope for each monitoring point in four consecutive time segments; It is understood that by reading the raw hydrogen sulfide concentration data of each monitoring point in the four tidal phases, the average concentration and the direction of the concentration change slope in each phase are determined. The average concentration in this invention refers to the arithmetic mean of the concentration values ​​of all sampling points in that phase. The direction of the concentration change slope refers to the sign of the slope of the straight line obtained by fitting the concentration time series of that phase using the least squares method. A positive value indicates that the overall concentration is rising, a negative value indicates that the overall concentration is falling, and a zero value indicates that the concentration is basically stable.

[0066] It is easy to understand that the quadruple features formed based on these parameters are attached to the metadata of each monitoring point to form a structured stage feature record. This process transforms the original time series data into standardized input that can be used for clustering and partitioning, providing a quantitative basis for subsequent initial risk area correction.

[0067] Among them, the average concentration is the arithmetic mean of the hydrogen sulfide concentration within a single tidal phase; the direction of the concentration change slope is a symbolic identifier of the concentration change trend in that phase; and the quadruple feature is a combined data structure containing the average values ​​and slope directions of the four phases.

[0068] S33. Monitoring points with the same slope of concentration change and similar average hydrogen sulfide concentrations are grouped into the same initial risk area.

[0069] Understandably, once the average concentration and slope direction are calculated, the monitoring points can be merged again within the initial risk area. For example, if the slope direction of the concentration change of two monitoring points is positive and the average hydrogen sulfide concentrations are 4.1 ppm and 4.3 ppm respectively, then these two monitoring points can be merged into the same initial risk area. At the same time, it is necessary to check whether other monitoring points in the area meet the same conditions. If they do, they are merged; if they do not, they are retained as independent sub-regions.

[0070] The initial risk area is the set of monitoring points formed after clustering in step S2. For example, the above-mentioned upstream area contains 5 monitoring points. After calculation in step S32, it is found that 4 of the points have a positive slope and an average value in the range of 4.0 to 4.5 ppm at the end of the high tide. The average value of the 5th point is 5.8 ppm. The first 4 points are grouped into the same sub-region, and the 5th point is grouped into a separate region. When all monitoring points in the region are merged, it indicates that the consistency within the initial risk area has reached the preset standard, so that subsequent governance can be implemented according to a unified strategy, reducing the complexity of governance parameter configuration.

[0071] The tolerance for determining the similarity of the average concentration range and the consistency of the slope direction mentioned in this section can be set according to the actual needs of relevant technical personnel, and this invention does not limit it.

[0072] In some embodiments, the governance partition includes: S34, in response to the need to determine the conditions for merging adjacent governance zones, obtain the hydrogen sulfide exposure equivalent values ​​for any two spatially adjacent governance zones. Understandably, in order to facilitate merging decisions based on the risk level of the governance zones and thus reduce the scheduling complexity of the governance execution unit, the hydrogen sulfide exposure equivalent values ​​of any two spatially adjacent governance zones can be obtained. This provides quantitative input for subsequent merging judgments, so that an optimized set of governance zones can be sent to the governance priority ranking module. Ultimately, this allows the central processing unit to schedule fewer nozzles to perform actions per unit cycle.

[0073] Among them, the hydrogen sulfide exposure equivalent value is the sum of the product of hydrogen sulfide concentration and time accumulated in the treatment zone within a single tidal cycle; the spatially adjacent treatment zones are two treatment zones with a circumferential angle difference of less than 30 degrees on the surface of a single pile and an elevation overlap rate of more than 50%; the merging decision is the operation to determine whether two treatment zones can be covered by the same set of treatment parameters.

[0074] The upper limit of the circumferential angle difference and the lower limit of the elevation overlap rate mentioned in this section can be set according to the actual needs of relevant technical personnel, and are not limited in this invention.

[0075] S35, determine the case where the absolute value of the difference between the hydrogen sulfide exposure equivalent values ​​of two spatially adjacent treatment zones is less than the average exposure equivalent value of the two zones. It should be pointed out that the main reason for the excessive fragmentation of governance zones in the existing technology, or the problem of large differences in governance strategies between adjacent zones due to small concentration fluctuations, is that the absolute concentration difference is used as the merging criterion.

[0076] In the actual corrosive environment of offshore wind turbine monopiles, the concentration of hydrogen sulfide naturally fluctuates. If a fixed absolute threshold such as 0.5 ppm is used as the merging standard, merging will be rejected in high concentration areas (such as 5 ppm) due to a difference of 0.6 ppm, while merging will be incorrect in low concentration areas (such as 1 ppm) due to a difference of 0.4 ppm.

[0077] Given these issues, skipping this step and directly performing the partition merging operation could lead to a waste of resources. At best, it would increase corrosion inhibitor consumption; at worst, frequent nozzle switching would reduce equipment lifespan. Even if partition boundaries could be manually adjusted later, it wouldn't be able to respond to tidal changes in real time.

[0078] Therefore, after obtaining the hydrogen sulfide exposure equivalent values ​​of two adjacent treatment zones, this invention designs an operation that requires determining whether the absolute value of the difference between the hydrogen sulfide exposure equivalent values ​​is less than the average exposure equivalent value of the two zones. Only when this condition is met is the subsequent merging process allowed, thus enabling adaptive optimization of the zone granularity within a relative error framework.

[0079] The absolute value of the difference between the hydrogen sulfide exposure equivalent values ​​can be understood as the absolute deviation of the risk levels of the two governance zones; the average exposure equivalent value can be understood as the benchmark reference value of the risk levels of the two governance zones.

[0080] The relative error multiple threshold mentioned in this section can be set according to the actual needs of relevant technical personnel, and this invention does not limit it.

[0081] S36, merge two spatially adjacent governance zones that meet the condition into a new governance zone. The spatial extent of the new governance zone is the union of the spatial extents of the two original governance zones, and the hydrogen sulfide exposure equivalent of the new governance zone is the arithmetic mean of the exposure equivalents of the two original governance zones.

[0082] Understandably, two spatially adjacent treatment zones that meet the merging conditions are considered adjacent areas that can be uniformly treated. That is, treatment zones whose absolute difference in hydrogen sulfide exposure equivalent values ​​is less than their average exposure equivalent values. For example, if there are treatment zones A and B at an elevation of 5 meters on the starboard side of a monopile, with A having an exposure equivalent of 120 ppm·h and B having an exposure equivalent of 90 ppm·h, and their average being 105 ppm·h, and the absolute difference being 30 ppm·h, which is less than 105 ppm·h, then A and B can be merged into a new treatment zone C. The exposure equivalent of C can be calculated as 105 ppm·h, which is obtained from the arithmetic mean of the exposure equivalents of A and B. The spatial ranges of A and B can be combined to form the spatial range of C, so that the treatment execution units can be scheduled according to unified parameters.

[0083] The spatial extent of the new governance zone is the union of the spatial extents of the two original governance zones, for example, from 120 degrees to 180 degrees in the circumferential direction and from 4 meters to 6 meters in elevation; the hydrogen sulfide exposure equivalent of the new governance zone is the arithmetic mean of the exposure equivalents of the two original governance zones, for example, (120+90)÷2=105ppm·h; the union of the spatial extents is the smallest convex hull region covering all coordinates of the two original zones.

[0084] The spatial range merging algorithm and coordinate accuracy requirements mentioned in this section can be set according to the actual needs of relevant technical personnel, and are not limited in this invention.

[0085] S4. The treatment zones are numerically sorted according to the accumulated hydrogen sulfide exposure equivalent within a unit tidal cycle to generate a treatment priority sequence reflecting the urgency of the treatment. The specific process is as follows: Figure 2 As shown, where: Specifically, this step verifies whether the set of governance partitions output in the preceding steps has been spatiotemporally uniquely identified. Having obtained the list of governance partitions generated in the preceding steps, the central processing unit first loads the hydrogen sulfide exposure equivalent value of each governance partition into a priority sorting buffer, and then obtains the total number of governance partitions N.

[0086] Furthermore, the specific priority sorting logic is executed, activating the sorting algorithm module to sort all governance partitions in the buffer in descending order of hydrogen sulfide exposure equivalent values. For each pair of governance partitions compared, the system reads their respective exposure equivalent values, performs a value comparison, and updates the sorting index table.

[0087] The process stops after N×(N-1) / 2 comparisons, and the resulting sorted list is the initial governance priority sequence.

[0088] If the governance priority sequence is not empty, the sorting is considered successful, and the first element of the sequence is directly marked as the highest priority governance partition. If the sequence is empty, an empty sequence signal is sent directly, and the governance execution queue is cleared, blocking subsequent scheduling actions.

[0089] The hydrogen sulfide exposure equivalent value is the cumulative total exposure contribution of the treatment zone within a single tidal cycle; the initial treatment priority sequence is a list of treatment zones arranged in descending order of exposure equivalent.

[0090] The sorting algorithm type and the upper limit of the number of comparisons mentioned in this section can be set according to the actual needs of relevant technical personnel, and are not limited in this invention.

[0091] In some embodiments, the governance zones are numerically sorted according to the cumulative hydrogen sulfide exposure equivalent per unit tidal cycle, including: S41, in response to the need to identify the abnormal increase in hydrogen sulfide concentration at the end of the high tide stage, extract the peak hydrogen sulfide concentration data of each treatment zone at the end of the high tide stage. S42, areas where the peak concentration of hydrogen sulfide is significantly higher than the historical average for the same period are identified as high instantaneous risk areas; S43 elevates the treatment priority of high instantaneous risk zones to the top of the current treatment priority sequence and triggers the corrosion inhibitor injection device to perform a single pulse high-concentration spray operation on the corresponding treatment zone.

[0092] Among them, the peak hydrogen sulfide concentration data refers to the maximum concentration value recorded in the treatment zone during the late stage of high tide; the high instantaneous risk zone refers to the treatment zone where the concentration rises abnormally due to sudden hydrogen sulfide release; and the single pulse high concentration injection operation refers to the emergency action of releasing a high concentration of corrosion inhibitor within 5 seconds.

[0093] In some embodiments, step S41, which involves extracting peak hydrogen sulfide concentration data for each treatment zone at the end of high tide, includes S411a to S411c, specifically including: S411a, select all concentration records whose timestamps fall at the end of high tide from the multidimensional hydrogen sulfide concentration data sequence set of the governance zone.

[0094] The late high tide stage refers to the time interval during which the tide level rises from half tide to its highest point; the concentration record refers to the raw data entry containing timestamps, concentration values, and sensor IDs.

[0095] S411b: Iterate through the selected concentration records, find the record with the largest concentration value, and use its concentration value as the peak hydrogen sulfide concentration data for that treatment zone.

[0096] The peak concentration data for hydrogen sulfide is a scalar value, expressed in ppm.

[0097] S411c, The peak hydrogen sulfide concentration data is appended to the metadata of the treatment zone for use in step S42.

[0098] In some embodiments, step S42 may involve retrieving the peak hydrogen sulfide concentration data of the treatment zone and the historical average level database for the same period, calculating the difference between the two, and marking the treatment zone as a high instantaneous risk zone when the difference is greater than 50% of the historical average level for the same period.

[0099] Among them, the historical average level refers to the average concentration peak value of the past 30 tidal phases; 50% is the threshold for anomaly judgment; and high instantaneous risk zones are governance zones that require emergency intervention.

[0100] In some embodiments, step S43 may involve removing the high instantaneous risk zone from the initial treatment priority sequence and inserting it at the beginning of the sequence, while simultaneously sending a pulse injection command to the corrosion inhibitor injection device, the command including the spatial azimuth range of the target treatment zone and an injection duration of 5 seconds.

[0101] The corrosion inhibitor injection device is a rotatable nozzle array installed in the circumferential direction of a single pile; the pulse injection command is a control signal containing spatial and temporal parameters.

[0102] The historical number of days in the same period, the percentage of abnormal judgments, and the spraying duration mentioned in this section can be set according to the actual needs of relevant technical personnel, and are not limited in this invention.

[0103] In some embodiments, the governance zones are numerically sorted according to the cumulative hydrogen sulfide exposure equivalent per unit tidal cycle, including: S44, in response to the need to identify the phenomenon of persistently high hydrogen sulfide concentration during the late stage of low tide, the duration of hydrogen sulfide concentration above the baseline level in each treatment zone during the late stage of low tide is statistically analyzed. S45, the treatment zone with a large proportion of the duration of hydrogen sulfide concentration above the baseline level being a large part of the total duration of a single tidal cycle is identified as a continuous corrosion zone. S46 maintains the treatment priority of the continuously corroded zone at the top of the treatment priority sequence, and activates the local cathodic protection anode unit deployed in the corresponding spatial location of the treatment zone to increase the protection current density of the spatial location.

[0104] In some embodiments, the specific implementation steps for calculating the duration of hydrogen sulfide concentration above the baseline level in each treatment zone during the late stage of low tide in step S44 include: S441, obtain all hydrogen sulfide concentration sampling points and their timestamps in the treatment zone during the final stage of low tide.

[0105] Understandably, during the final stage of low tide, the water flow is slow, and hydrogen sulfide is continuously released from the sediment, causing the concentration to remain high for an extended period.

[0106] The duration is the sum of continuous or cumulative times during which the concentration is above the baseline level.

[0107] S442 sets the baseline level as the 80th percentile of historical hydrogen sulfide concentrations for the same period.

[0108] Understandably, the baseline level is used to distinguish between normal fluctuations and persistent corrosion.

[0109] S443: Traverse all sampling points, mark sampling points with concentrations greater than the baseline level, and calculate the time interval between adjacent high-concentration sampling points. If the interval is less than twice the sampling period, it is considered a continuous high-concentration period.

[0110] Understandably, judging by time continuity can avoid misjudgments caused by sampling noise.

[0111] S451, sum the durations of all consecutive high-concentration periods to obtain the total duration length.

[0112] S452, divide the total duration by the total duration of a single tidal cycle to obtain the duration percentage.

[0113] Understandably, the duration percentage reflects the persistence of the corrosion.

[0114] S453, when the duration accounts for more than 30%, the treatment zone is marked as a continuous corrosion zone.

[0115] Understandably, 30% is an empirical threshold to ensure that only long-term high-risk areas are identified.

[0116] Among them, the continuous corrosion zone is the treatment zone that requires continuous cathodic protection.

[0117] S461 fixes the treatment priority of the continuously corroded partition in the top 3 of the treatment priority sequence, and does not downgrade it even if its exposure equivalent value is low.

[0118] S462 sends a current boost command to the local cathodic protection anode unit, increasing the protection current density from 150 mA / m 2 Increased to 250mA / m 2 .

[0119] It is understandable that increasing the current density can accelerate cathode polarization and suppress electrochemical corrosion caused by hydrogen sulfide.

[0120] It is worth noting that this step enables the cathodic protection system to adapt to the risk of continuous corrosion, thereby reducing the consumption of corrosion inhibitors and significantly extending the life of the single pile structure.

[0121] The reference level percentile, duration percentage threshold, and current density values ​​mentioned in this section can be set according to the actual needs of relevant technical personnel, and are not limited in this invention.

[0122] In some embodiments, the governance priority sequence includes: S47, in response to the need for dynamic updates of governance zones, obtain the hydrogen sulfide exposure equivalent values ​​of each governance zone within the current tidal cycle; S48, the treatment zone where the hydrogen sulfide exposure equivalent value is lower than the historical average exposure equivalent level for multiple consecutive tidal cycles is identified as a low-risk zone. S49, remove the low-risk partition from the current governance priority sequence and suspend power and material supply to the governance execution unit corresponding to the low-risk partition.

[0123] In this embodiment, the hydrogen sulfide exposure equivalent value refers to the quantitative index of the accumulated corrosion load of the treatment zone during the current tidal cycle; the low-risk zone refers to the treatment zone with significantly reduced corrosion activity; and the suspension of power supply and material supply refers to cutting off the power supply to the solenoid valve and nozzle motor of the corrosion inhibitor pipeline.

[0124] It should be noted that the corrosion risk of offshore wind turbine monopiles will naturally decrease in some areas during seasonal changes or seabed microbial community succession. Continuing to apply remedial measures in these areas would waste corrosion inhibitors and increase equipment wear. Relying solely on manual inspections to determine when to remove the piles would result in a delayed response. Therefore, it is essential to automatically identify low-risk conditions based on continuous exposure equivalent data.

[0125] In some embodiments, the hydrogen sulfide exposure equivalent values ​​for each governance zone within the current tidal cycle can be read from a time-series database first.

[0126] Furthermore, the current value is compared with the historical average exposure equivalent level of the past 7 tidal cycles on a cycle-by-cycle basis to determine whether it is below 80% of the historical average for 7 consecutive cycles.

[0127] Furthermore, based on the judgment result, a partition exit command is sent to the power management module to cut off the power supply relay and material supply valve of the corresponding governance execution unit.

[0128] For example, when the exposure equivalent of a certain backflow treatment zone in the past 7 cycles is 95, 92, 88, 90, 85, 87, and 89 ppm·h, while the historical average is 110 ppm·h, the system determines it to be a low-risk zone, automatically removes it from the priority sequence, and shuts off the power supply and corrosion inhibitor supply to its dedicated nozzle.

[0129] It is worth noting that this step enables the dynamic recycling of governance resources, significantly reducing operation and maintenance costs while ensuring safety.

[0130] The number of historical periods, percentage thresholds, and exposure equivalent units mentioned in this section can be set according to the actual needs of relevant technical personnel, and are not limited in this invention.

[0131] In some embodiments, hydrogen sulfide exposure equivalent includes: S410, in response to the need for quantitative calculation of hydrogen sulfide exposure equivalent, obtains the hydrogen sulfide concentration values ​​and the duration of the corresponding time segments for all time segments in a single tidal cycle for each treatment zone. S411, determine the hydrogen sulfide exposure contribution value for each time segment as the product of the hydrogen sulfide concentration value of that time segment and the duration of that time segment; S412, sum the hydrogen sulfide exposure contribution values ​​of all time segments to obtain the total hydrogen sulfide exposure equivalent of the treatment zone in a single tidal cycle.

[0132] It should be noted that hydrogen sulfide exposure equivalent provides an objective basis for prioritizing treatment. However, the duration of time segments in different treatment zones may vary due to tidal asymmetry, and the concentration values ​​themselves do not have a time accumulation effect. Furthermore, if the maximum concentration value is used directly for ranking, the impact of exposure duration is ignored.

[0133] Therefore, without calculating the exposure contribution value for each time segment, the central processing unit cannot accurately assess the true corrosion load. The time segments used in the actual implementation of this invention include four tidal phase stages.

[0134] For example, in a certain treatment zone, the initial stage of high tide lasts for 3.0 hours with an average concentration of 1.2 ppm, the final stage of high tide lasts for 3.2 hours with an average concentration of 4.5 ppm, the initial stage of low tide lasts for 3.1 hours with an average concentration of 2.0 ppm, and the final stage of low tide lasts for 3.1 hours with an average concentration of 3.0 ppm. If only the maximum concentration of 4.5 ppm is used for sorting, the cumulative contribution of other stages will be ignored.

[0135] Therefore, after obtaining the governance partition data, it is necessary to calculate the exposure contribution value based on the time segment.

[0136] In practice, a strategy of multiplying concentration by time and accumulating the results can be used to accurately calculate the exposure equivalent. For example, the contribution value of a time segment can be obtained by multiplying the average concentration of each time segment by its duration.

[0137] For example, the average concentration and duration of the treatment zone in the four tidal phases can be analyzed first. For instance, the contribution values ​​of the four segments of the treatment zone are 3.6 ppm·h, 14.4 ppm·h, 6.2 ppm·h, and 9.3 ppm·h, respectively.

[0138] Furthermore, based on the time segment boundaries, it ensures that the entire tidal cycle is covered without overlap or omission. For example, the system verifies that the total duration of the four phases equals 12.4 hours.

[0139] Furthermore, the contribution values ​​of the four segments are added together, such as 3.6 + 14.4 + 6.2 + 9.3 = 33.5 ppm·h, to obtain the total hydrogen sulfide exposure equivalent.

[0140] Furthermore, the total hydrogen sulfide exposure equivalent is used as the sole risk score for this governance zone and is used for priority ranking of S4, thereby reducing scheduling uncertainty caused by conflicts among multiple indicators.

[0141] Among them, the duration of the time segment is the actual time length of the tidal phase; the average concentration is the arithmetic mean of all sampling points within the phase; and the total hydrogen sulfide exposure equivalent is the sum of the contribution values ​​of each segment.

[0142] The total duration of the tidal cycle, the average concentration algorithm, and the number of time segments mentioned in this section can be set according to the actual needs of relevant technical personnel, and this invention does not limit them.

[0143] S5, according to the governance priority sequence, schedule the governance execution unit installed on the surface of the single pile to implement governance actions with differentiated configurations of intensity and duration for the corresponding governance zones.

[0144] The term "treatment execution unit" refers to the corrosion inhibitor spraying device and the cathodic protection anode installed on the surface of the single pile.

[0145] It should be noted that the governance execution unit provides physical response capabilities to the governance priority sequence. However, due to the significant differences in risk levels among different governance zones, and the fact that high-priority zones require stronger corrosion inhibitor coverage density, applying the same governance intensity to all zones would result in over-protection of low-risk areas and under-protection of high-risk areas.

[0146] Therefore, without scheduling the governance execution units according to the governance priority sequence, precise suppression of corrosion risk cannot be achieved. The differentiated parameters used in the actual implementation of this invention include injection flow rate, activation duration, and protection current density.

[0147] For example, in a certain tidal cycle, the first priority of the treatment sequence is the treatment zone at the end of high tide on the upstream side, with an exposure equivalent of 140 ppm·h, and the last priority is the treatment zone at the beginning of low tide on the downstream side, with an exposure equivalent of 60 ppm·h. If a uniform spray is applied for 10 seconds at a flow rate of 2 L / min, the former will still suffer corrosion, while the latter will waste the agent.

[0148] Therefore, after obtaining the governance priority sequence, it is necessary to determine the control parameters of the governance execution unit based on the priority position.

[0149] In practice, a combined strategy of priority index and execution parameter mapping table can be used to achieve differentiated governance. For example, the top 3 priority partitions can be assigned to high-traffic mode, partitions ranked 4th to 10th can be assigned to medium-traffic mode, and partitions ranked 10th and below can be assigned to low-traffic mode.

[0150] For example, the ranking position of each partition in the governance priority sequence can be parsed first. For instance, the system identifies that the current sequence contains 8 governance partitions, with the high instantaneous risk partition ranked first, and the persistent corrosion partition ranked second and third.

[0151] Furthermore, based on the preset parameter mapping rules, the first place is assigned a jet flow rate of 3L / min and a duration of 15 seconds, the second and third place are assigned a flow rate of 2.5L / min and a duration of 12 seconds, and the remaining zones are assigned a flow rate of 1.5L / min and a duration of 8 seconds.

[0152] Furthermore, the spatial orientation information corresponding to each treatment zone is retrieved to ensure that the nozzles are pointing to the correct area. For example, the nozzle azimuth angle for the frontal zone is 0 degrees to 90 degrees.

[0153] Furthermore, the parameter configuration instructions are packaged and sent to each dedicated execution nozzle to complete the differentiated configuration of intensity and duration, ultimately achieving the goal of accurately delivering corrosion inhibitors according to risk level.

[0154] Among them, the high flow mode is the operating state of 90% of the maximum output capacity; the medium flow mode is the operating state of 60%; and the low flow mode is the operating state of 30%.

[0155] It should be noted that the preset parameter mapping rules in the above examples can be configured with multi-dimensional parameters based on the priority ranking of the treatment zones, the hydrogen sulfide exposure equivalent value, and the risk type (such as high instantaneous risk zones, continuous corrosion zones). For example, for the top 3 high-risk zones in terms of priority ranking, the parameter mapping rules can be set as follows: When the exposure equivalent exceeds 120 ppm·h, the corrosion inhibitor spray flow rate automatically increases to 3.5 L / min, the continuous spraying time is extended to 20 seconds, and the cathodic protection current density is maintained at 250 mA / m. 2 ; For medium-risk zones ranked 4th to 8th, if the exposure equivalent is between 80 and 120 ppm·h, the injection flow rate should be adjusted to 2.0 L / min, the duration to 10 seconds, and the current density maintained at 180 mA / m. 2 ; The low-risk zones ranked 8th and below (exposure equivalent below 80 ppm·h) will use basic parameter configurations: flow rate 1.0 L / min, duration 5 seconds, and current density 150 mA / m². 2 .

[0156] In addition, for high instantaneous risk zones, the rules should also include pulse injection superposition parameters, such as adding two 5-second pulse injections with a 3-second interval on the basis of regular injection, to enhance the rapid suppression effect on sudden high concentrations of hydrogen sulfide. For areas subject to continuous corrosion, in addition to the flow and time parameters, periodic current density compensation is added three times a day to ensure the continuity of the protection effect. The preset parameter mapping rules are not limited here, and relevant technical personnel can design them according to the actual scenario or requirements, which will not be elaborated here.

[0157] The priority segment number, traffic percentage, and duration values ​​mentioned in this section can be set according to the actual needs of relevant technical personnel, and are not limited in this invention.

[0158] In some embodiments, the scheduling of remediation execution units installed on the surface of a monopile to perform remediation actions with differentiated configurations of intensity and duration on the corresponding remediation zones includes: S51, in response to the control requirements for the spatial pointing accuracy of the governance execution unit, obtain the azimuth range of each governance zone on the surface of a single pile; The azimuth range describes the angular span of the treatment zone at the circumferential position of a single pile.

[0159] It should be noted that the azimuth range provides a spatial positioning reference for the nozzle scheduling system. However, since the surface of a single pile is cylindrical, the treatment zones are distributed along the circumference and may span multiple angle ranges. Furthermore, if the azimuth definition is not uniform, it will lead to incorrect nozzle pointing. Additionally, the boundaries of the treatment zones may overlap or have gaps.

[0160] Therefore, without obtaining the azimuth range occupied by each treatment zone on the surface of a single pile, the nozzle control system cannot determine the target spraying area. In the actual implementation of this invention, the azimuth is defined with true north as 0 degrees, increasing clockwise to 360 degrees.

[0161] For example, on a monopile with a diameter of 10 meters, the frontal surface treatment zone covers sensors with IDs Q1 to Q4, and their installation azimuth angles are 10 degrees, 30 degrees, 50 degrees, and 70 degrees, respectively. The azimuth angle range of this zone is 10 degrees to 70 degrees. If this range is not specified, the nozzle may only cover 30 degrees to 50 degrees, omitting the edge area.

[0162] Therefore, before scheduling the governance execution unit, it is necessary to determine the azimuth range based on the set of sensors included in the governance partition.

[0163] Among them, the azimuth range is the closed interval formed by the minimum and maximum values ​​of the azimuth angles of all sensors contained in the governance zone; the sensor set is the list of hydrogen sulfide sensors deployed in the governance zone; and the single pile surface is the outer surface of the cylindrical steel structure.

[0164] The starting direction of the azimuth angle, the angle unit, and the sensor inclusion rules mentioned in this section can be set according to the actual needs of relevant technical personnel, and are not limited in this invention.

[0165] S52, determine the multiple rotatable nozzles installed in the circumferential direction of the single pile, and use the nozzles whose spray centerline azimuth angle falls into the azimuth angle range as the dedicated execution nozzles for the corresponding treatment zone. Among them, the dedicated execution nozzle refers to the rotatable nozzle that is solely responsible for spraying corrosion inhibitor in a certain treatment zone; the azimuth angle of the spray centerline refers to the projection angle of the main jet direction of the nozzle on the horizontal plane; the azimuth angle range refers to the angular span occupied by the treatment zone in the circumferential direction of a single pile.

[0166] In some embodiments, step S52, which determines the nozzles installed in the circumferential direction of the single pile as dedicated execution nozzles for the corresponding treatment zone, includes steps S521 to S524, specifically including: S521, obtain the fixed installation positions and rotation angle range of all rotatable nozzles for monopile circumferential installation.

[0167] Among them, the rotatable nozzle refers to the corrosion inhibitor spraying device with motor-driven rotation function; the rotatable angle range refers to the azimuth angle range that the nozzle can cover, for example, each nozzle can rotate 45 degrees to the left and right.

[0168] S522, calculate the adjustable range of the azimuth angle of the spray centerline of each rotatable nozzle, and determine whether the range intersects with the azimuth angle range of the treatment zone.

[0169] Among them, the adjustable range of the spray centerline azimuth angle refers to all angles that the centerline can point to after the nozzle is rotated; intersection refers to the overlapping part of two angle intervals.

[0170] S523, when multiple nozzles satisfy the intersection condition, calculate the absolute value of the angle deviation between the midpoint of the adjustable azimuth angle range of the spray centerline of each nozzle and the midpoint of the azimuth angle range of the treatment zone, and select the nozzle with the smallest deviation as the candidate nozzle.

[0171] It should be noted that multiple nozzles may cover the same treatment zone at the same time, but random allocation will result in overlapping or blank sprays. This invention ensures that each treatment zone is uniquely and centrally covered by the principle of minimum midpoint deviation, so as to achieve optimal uniformity of subsequent spraying.

[0172] S524, mark the candidate nozzle as the exclusive execution nozzle of the governance zone, and record the mapping relationship between its nozzle ID and governance zone ID.

[0173] The mapping relationship is a key-value pair data structure stored in the central processing unit.

[0174] The rotatable angle range, deviation calculation method, and number of nozzles mentioned in this section can be set according to the actual needs of relevant technical personnel, and are not limited in this invention.

[0175] S53 locks the rotation angle of the dedicated execution nozzle to the center position of the azimuth angle range, and adjusts the opening duration and injection flow rate of the nozzle according to the position of the treatment zone in the treatment priority sequence.

[0176] In this embodiment, the opening duration refers to the length of time the corrosion inhibitor nozzle solenoid valve remains open; the spray flow rate refers to the volume of corrosion inhibitor sprayed per unit time; and the treatment priority sequence position refers to the ranking number of the treatment zone in the sorting list.

[0177] It should be noted that corrosion control of offshore wind turbine monopiles requires a balance between protective effectiveness and resource consumption. If too short a spraying time is applied to high-priority areas, the corrosion inhibitor film thickness will be insufficient to block hydrogen sulfide penetration; conversely, if too high a flow rate is applied to low-priority areas, it will result in waste of reagents and pollution of the marine environment. Therefore, nozzle parameters must be dynamically adjusted according to priority location to improve the overall control effect.

[0178] In some embodiments, the ranking number of the governance partition can be read first from the governance priority sequence.

[0179] Furthermore, the ranking number is matched with the preset parameter configuration table to determine the corresponding activation duration and injection flow rate.

[0180] Furthermore, an angle locking command is sent to the servo motor of the dedicated actuator nozzle, rotating it to the center position of the azimuth angle range, and an opening adjustment command is sent to the flow control valve.

[0181] For example, when a high instantaneous risk zone ranks 1, the system sets its nozzle opening duration to 20 seconds and the spray flow rate to 3.5 liters per minute; when a continuous corrosion zone ranks 3, the opening duration is set to 15 seconds and the spray flow rate is set to 2.8 liters per minute; when a normal zone ranks 8, the opening duration is set to 8 seconds and the spray flow rate is set to 1.2 liters per minute.

[0182] It is worth noting that this step enables the corrosion inhibitor spraying system to adapt to changes in risk level, ensuring adequate protection of critical areas while significantly reducing the total consumption of the agent and the impact on the marine ecosystem throughout the entire process.

[0183] The parameter configuration table content, flow rate unit, and time unit mentioned in this section can be set according to the actual needs of relevant technical personnel, and this invention does not impose any limitations.

[0184] In summary, this method acquires hydrogen sulfide concentration data sequences from multiple monitoring points on a single pile surface over a continuous tidal cycle. It then clusters these data points based on concentration variation patterns under different tidal phases to form initial risk areas. These initial risk areas are further segmented into uniquely corresponding remediation zones based on the temporal and spatial progression of the tidal cycle. Each remediation zone is prioritized according to its accumulated hydrogen sulfide exposure equivalent within a unit tidal cycle, generating a remediation priority sequence. The remediation execution unit then implements differentiated remediation actions for each zone based on this sequence. This method aligns remediation resource allocation with hydrogen sulfide corrosion risk in the spatiotemporal dimension, avoiding over-remediation in low-risk areas while ensuring sufficient remediation intensity at high-risk locations.

[0185] Example 2 This embodiment also provides an intelligent control system for hydrogen sulfide treatment of offshore wind power monopile based on a spatiotemporal partitioning strategy, including: a monitoring module, which, in response to the monitoring needs of hydrogen sulfide corrosion risk on the surface of offshore wind power monopile, acquires hydrogen sulfide concentration data sequences collected by multiple monitoring points deployed on the surface of the monopile during a continuous tidal cycle. The partitioning module determines the concentration change pattern of each monitoring point in the hydrogen sulfide concentration data sequence under different tidal phases, and clusters monitoring points that are spatially adjacent and have similar concentration change patterns to form initial risk areas. Then, the initial risk areas are divided into treatment zones with unique spatiotemporal locations according to the tidal cycle. The sorting module sorts each governance zone according to the cumulative hydrogen sulfide exposure equivalent within a unit tidal cycle, generating a governance priority sequence that reflects the urgency of governance. The scheduling module controls the governance execution units installed on the surface of the monopile to perform governance actions with differentiated configurations of intensity and duration for the corresponding governance zones, based on the governance priority sequence.

[0186] The above-mentioned unit modules can be embedded in the processor of the electronic device in hardware form or independent of it, or they can be stored in the memory of the electronic device in software form, so that the processor can call and execute the corresponding operations of the above modules.

[0187] It should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit it. Although the present invention has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solutions of the present invention without departing from the spirit and scope of the technical solutions of the present invention, and all such modifications and substitutions should be covered within the scope of the claims of the present invention.

[0188] Although preferred embodiments of the invention have been described, those skilled in the art, upon learning the basic inventive concept, can make other changes and modifications to these embodiments. Therefore, the appended claims are intended to be interpreted as including both the preferred embodiments and all changes and modifications falling within the scope of the invention.

[0189] Obviously, those skilled in the art can make various modifications and variations to this invention without departing from its spirit and scope. Therefore, if these modifications and variations fall within the scope of the claims of this invention and their equivalents, this invention also intends to include these modifications and variations.

Claims

1. A method for intelligent control of hydrogen sulfide in offshore wind power monopiles based on a spatiotemporal partitioning strategy, characterized in that, include: In response to the need to monitor the risk of hydrogen sulfide corrosion on the surface of offshore wind turbine monopiles, a sequence of hydrogen sulfide concentration data collected from multiple monitoring points deployed on the surface of the monopiles during a continuous tidal cycle was obtained. Determine the concentration change pattern of each monitoring point in the hydrogen sulfide concentration data sequence under different tidal phases, and cluster monitoring points that are spatially adjacent and have similar concentration change patterns to form an initial risk area; The initial risk area is divided into multiple consecutive time segments according to the time process of the tidal cycle, and each initial risk area is divided into several treatment zones with unique spatiotemporal locations based on the specific tidal phase in which the peak hydrogen sulfide concentration occurs within each time segment. The governance zones are numerically sorted according to the hydrogen sulfide exposure equivalent accumulated within a unit tidal cycle to generate a governance priority sequence that reflects the urgency of governance. According to the governance priority sequence, the governance execution unit installed on the surface of the monopile is scheduled to perform governance actions with differentiated configurations of intensity and duration for the corresponding governance zones.

2. The intelligent control method for hydrogen sulfide treatment of offshore wind power monopile based on spatiotemporal partitioning strategy as described in claim 1, characterized in that, The process of dividing the initial risk area into multiple consecutive time segments according to the tidal cycle includes: In response to the need to divide the natural rhythm of the tidal cycle, each tidal cycle is divided into four consecutive time segments: the early stage of high tide, the late stage of high tide, the early stage of low tide, and the late stage of low tide. Determine the average hydrogen sulfide concentration and the direction of the slope of concentration change for each monitoring point within the four consecutive time segments. Monitoring points with the same slope of concentration change and similar average hydrogen sulfide concentrations are grouped into the same initial risk area.

3. The intelligent control method for hydrogen sulfide treatment of offshore wind power monopile based on spatiotemporal partitioning strategy as described in claim 2, characterized in that, The process of ranking each treatment zone according to the cumulative hydrogen sulfide exposure equivalent within a unit tidal cycle includes: In response to the need to identify the abnormal increase in hydrogen sulfide concentration at the end of high tide, peak hydrogen sulfide concentration data of each treatment zone at the end of high tide were extracted. Zones with peak hydrogen sulfide concentrations significantly higher than the historical average for the same period were identified as high-instantaneous-risk zones. The treatment priority of the high instantaneous risk zone is raised to the top of the current treatment priority sequence, and the corrosion inhibitor injection device is triggered to perform a single pulse high-concentration spray operation on the corresponding treatment zone.

4. The intelligent control method for hydrogen sulfide treatment of offshore wind power monopile based on spatiotemporal partitioning strategy as described in claim 3, characterized in that, The process of ranking each treatment zone according to the cumulative hydrogen sulfide exposure equivalent within a unit tidal cycle includes: In response to the need to identify the persistently high hydrogen sulfide concentration during the late stage of low tide, the duration of hydrogen sulfide concentration above the baseline level in each treatment zone during the late stage of low tide was statistically analyzed. Zones with a high proportion of the total duration of a single tidal cycle and a duration of hydrogen sulfide concentration above the baseline level are identified as zones of persistent corrosion. The treatment priority of the continuously corroded zone is maintained at the top of the treatment priority sequence, and the local cathodic protection anode unit deployed in the corresponding spatial location of the treatment zone is activated to increase the protection current density of the spatial location.

5. The intelligent control method for hydrogen sulfide treatment of offshore wind power monopile based on spatiotemporal partitioning strategy as described in claim 4, characterized in that, The governance priority sequence includes: In response to the need for dynamic updates to the governance zones, the hydrogen sulfide exposure equivalent values ​​for each governance zone within the current tidal cycle are obtained. Zones where hydrogen sulfide exposure equivalent values ​​have been lower than the historical average exposure equivalent level for multiple consecutive tidal cycles are identified as low-risk zones. Remove the low-risk partition from the current governance priority sequence and suspend power and material supply to the governance execution unit corresponding to the low-risk partition.

6. The intelligent control method for hydrogen sulfide treatment of offshore wind power monopile based on spatiotemporal partitioning strategy as described in claim 5, characterized in that, The scheduling and installation of the remediation execution unit on the surface of the monopile implements remediation actions with differentiated configurations of intensity and duration for the corresponding remediation zones, including: In response to the control requirements for the spatial pointing accuracy of the governance execution unit, the azimuth range of each governance zone on the surface of a single pile is obtained; The nozzles installed in the circumferential direction of the single pile are designated as the dedicated execution nozzles for the corresponding treatment zones, with the nozzles whose spray centerline azimuth angle falls within the azimuth angle range. The rotation angle of the dedicated execution nozzle is locked to the center position of the azimuth range, and the opening duration and injection flow rate of the nozzle are adjusted according to the position of the governance zone in the governance priority sequence.

7. The intelligent control method for hydrogen sulfide treatment of offshore wind power monopile based on spatiotemporal partitioning strategy as described in claim 6, characterized in that, The hydrogen sulfide exposure equivalent includes: In response to the need for quantitative calculation of hydrogen sulfide exposure equivalent, the hydrogen sulfide concentration values ​​and the duration of the corresponding time segments for each governance zone in all time segments within a single tidal cycle are obtained. The hydrogen sulfide exposure contribution value for each time segment is determined to be the product of the hydrogen sulfide concentration value of that time segment and the duration of that time segment; The total hydrogen sulfide exposure equivalent for the governance zone within a single tidal cycle is obtained by summing the hydrogen sulfide exposure contributions from all time segments.

8. The intelligent control method for hydrogen sulfide treatment of offshore wind power monopile based on spatiotemporal partitioning strategy as described in claim 7, characterized in that, The governance zones include: In response to the need to determine the conditions for merging adjacent governance zones, the hydrogen sulfide exposure equivalent values ​​of any two spatially adjacent governance zones are obtained. Determine the case where the absolute value of the difference between the hydrogen sulfide exposure equivalent values ​​of two spatially adjacent treatment zones is less than the average exposure equivalent value of the two zones. Two spatially adjacent governance zones that meet this condition are merged into a new governance zone. The spatial extent of the new governance zone is the union of the spatial extents of the two original governance zones, and the hydrogen sulfide exposure equivalent of the new governance zone is the arithmetic mean of the exposure equivalents of the two original governance zones.

9. The intelligent control method for hydrogen sulfide treatment of offshore wind power monopile based on spatiotemporal partitioning strategy as described in claim 8, characterized in that, The acquisition of hydrogen sulfide concentration data sequences collected from multiple monitoring points deployed on the surface of a single pile during continuous tidal cycles includes: In response to the need to ensure the integrity of the spatial coverage of hydrogen sulfide distribution on the surface of a monopile, multiple hydrogen sulfide sensors are deployed on the upstream side, downstream side, port side, and starboard side of the monopile to form a monitoring point array. Each hydrogen sulfide sensor is required to collect hydrogen sulfide concentration data at fixed time intervals during the tidal cycle and upload it to the central processing unit. All hydrogen sulfide concentration data uploaded by hydrogen sulfide sensors are structured and stored according to the spatial location of the monitoring points and the collection timestamp, forming a multidimensional hydrogen sulfide concentration data sequence set.

10. A smart control system for hydrogen sulfide treatment of offshore wind power monopiles based on a spatiotemporal partitioning strategy, employing the method described in any one of claims 1 to 9, characterized in that, include: The monitoring module, in response to the monitoring needs of hydrogen sulfide corrosion risk on the surface of offshore wind turbine monopile, acquires hydrogen sulfide concentration data sequences collected from multiple monitoring points deployed on the surface of the monopile during continuous tidal cycles. The partitioning module determines the concentration change pattern of each monitoring point in the hydrogen sulfide concentration data sequence under different tidal phases, and clusters monitoring points that are spatially adjacent and have similar concentration change patterns to form an initial risk area. Then, the initial risk area is divided into a treatment partition with a unique spatiotemporal location according to the tidal cycle. The sorting module sorts each governance zone according to the cumulative hydrogen sulfide exposure equivalent within a unit tidal cycle, generating a governance priority sequence that reflects the urgency of governance. The scheduling module, based on the governance priority sequence, controls the governance execution unit installed on the surface of the monopile to perform governance actions with differentiated configurations of intensity and duration for the corresponding governance zones.

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