Deaeration control system and method based on synchronous regulation

Abstract

The present application relates to the technical field of environmental protection equipment control, and discloses a kind of deaeration control system and method based on synchronous regulation.The system includes: data acquisition unit, for obtaining and confirming the starting preparation state signal of environmental protection equipment;Dissolved oxygen prediction unit, for predicting the dissolved oxygen concentration of deaerator outlet feed water at a specific future time point based on the signal, historical operation data and mass transfer mechanism model, and outputting the predicted concentration value;Timing control unit, for generating a regulation instruction according to the starting signal and the predicted value, and sending it to the execution unit within a preset time before the equipment starts;Execution unit, for adjusting the opening degree of the steam bypass valve in response to the instruction.The present application realizes the advance accurate regulation of dissolved oxygen concentration through prediction feedforward and timing cooperative control, ensures that the water quality meets the standard immediately when the environmental protection equipment starts, and improves the stability and efficiency of the system start.

Description

Technical Field

[0001] This application relates to the field of environmental protection equipment control technology, and in particular to a deoxygenation control system and method based on synchronous regulation. Background Technology

[0002] During the startup of environmental protection equipment, the dissolved oxygen concentration in the feedwater at the deaerator outlet is a key water quality indicator affecting the operating efficiency and lifespan of subsequent equipment. Currently, the adjustment of dissolved oxygen before equipment startup generally relies on the experience of operators or simple feedback control, with steam valves often only adjusted after equipment startup, resulting in a significant adjustment lag. This easily leads to excessive dissolved oxygen in the feedwater during the initial startup phase, affecting the effectiveness of chemical dosing, exacerbating internal corrosion, and failing to meet the stringent requirements of rapid startup and environmental emissions. Therefore, how to accurately predict and adjust the dissolved oxygen concentration in advance before equipment startup to achieve zero-lag water quality control during the startup process has become an urgent technical problem to be solved. Summary of the Invention

[0003] To address the aforementioned technical problems, this invention provides a deoxygenation control system and method based on synchronous regulation. The system confirms the equipment's pre-start status through a data acquisition unit, and a dissolved oxygen prediction unit predicts the future dissolved oxygen concentration based on historical data and a mechanistic model. The timing control unit generates and sends regulation commands in advance based on the prediction results and a preset start-up time. The execution unit ultimately drives the steam bypass valve. This invention, through predictive feedforward and timing coordination, achieves precise and synchronous regulation of dissolved oxygen concentration before the environmental protection equipment starts up, ensuring that the water quality meets standards immediately upon equipment startup and effectively avoiding water quality fluctuations and equipment corrosion risks during the initial startup phase.

[0004] In some embodiments of this application, a deoxygenation control system based on synchronous regulation is provided, comprising:

[0005] The data acquisition unit is used to acquire and confirm the start-up preparation status signal of the environmental protection equipment in real time; The dissolved oxygen prediction unit is used to predict the dissolved oxygen concentration of the deaerator outlet feedwater at a specific future time point based on the start-up preparation state signal, historical operating data, and the deaerator mass transfer mechanism model, and output the predicted concentration value. The timing control unit is used to generate an adjustment command based on the start-up preparation state signal and the predicted concentration value, and send the adjustment command to the execution unit within a preset time before the start of the environmental protection equipment. An execution unit is used to respond to and execute the regulation command, and to regulate the opening degree of the steam bypass valve supplying steam to the deaerator.

[0006] In some embodiments of this application, the data acquisition unit is used to acquire and confirm the start-up preparation status signal of the environmental protection equipment in real time, including: The signal acquisition module is used to acquire multiple signals that characterize the start-up preparation state of the environmental protection equipment; The signal processing module is used to perform logical verification, timing analysis and validity determination on the multiple signals, and generate determination results; The logic arbitration module is used to confirm and output the start-up preparation state signal when the determination result shows that the multiple signals are consistent and valid in logic and timing. When the determination result shows that there is inconsistency among the multiple signals, the pre-stored historical operating parameter sequence and operating mode are logically arbitrated, and the arbitrated start-up preparation status signal is output.

[0007] In some embodiments of this application, the dissolved oxygen prediction unit is used to predict the dissolved oxygen concentration of the deaerator outlet feedwater at a specific future time point based on the start-up preparation state signal, historical operating data, and a deaerator mass transfer mechanism model, and output the predicted concentration value, including: The data extraction module is used to extract a sequence of historical operating parameters that matches the current operating condition from the historical operating database based on the start-up preparation state signal. The prediction model module is used to construct and run a dynamic prediction model of dissolved oxygen concentration based on the historical operating parameter sequence and the mass transfer mechanism of the deaerator, and to predict the trend of dissolved oxygen concentration change in the deaerator outlet feedwater within a specific time window in the future. The output and optimization module is used to determine and output the predicted concentration value for a specific future time point from the dissolved oxygen concentration change trend based on the preset start time of the environmental protection equipment. The output and optimization module is further used to compare the predicted concentration value with the real-time monitored dissolved oxygen concentration measurement value, dynamically optimize the parameters of the dynamic prediction model of dissolved oxygen concentration based on the deviation, and send the optimized prediction result to the timing control unit.

[0008] In some embodiments of this application, the timing control unit is configured to generate an adjustment command based on the start-up preparation state signal and the predicted concentration value, and send the adjustment command to the execution unit within a preset time before the start-up of the environmental protection equipment, including: The comparison module is used to compare the predicted concentration value with a preset dissolved oxygen concentration threshold after receiving a valid start-up preparation state signal, and generate a comparison result. The instruction generation module is used to calculate the target opening degree of the steam bypass valve based on the comparison result using a preset control algorithm, and generate corresponding adjustment instructions. The instruction sending module is used to calculate the instruction sending time that is earlier than the preset start time of the environmental protection equipment, and automatically send the adjustment instruction to the execution unit when the instruction sending time is reached; The strategy switching module automatically switches the control mode from feedforward control based on the predicted concentration value to feedback closed-loop control based on the real-time dissolved oxygen concentration measurement value.

[0009] In some embodiments of this application, the comparison module is used to compare the predicted concentration value with a preset dissolved oxygen concentration threshold after receiving a valid start-up preparation state signal, and generate a comparison result, including: The threshold setting submodule is used to dynamically call the applicable preset dissolved oxygen concentration threshold from the pre-stored threshold mapping table based on the preset start time of the environmental protection equipment, the current water supply temperature and the historical operating conditions of the same period. A multi-level comparison submodule is used to perform multi-level comparisons between the predicted concentration value and the dynamically generated preset dissolved oxygen concentration threshold. The multi-level comparisons include at least: The predicted concentration value is compared with the first-level warning threshold to determine whether adjustment is needed. The predicted concentration value is compared with the secondary target threshold to generate a level signal characterizing the urgency of regulation; The result generation submodule is used to generate a comparison result that includes whether adjustment is needed, the urgency level of adjustment, and the suggested adjustment direction, and sends the comparison result to the instruction generation module.

[0010] In some embodiments of this application, the instruction generation module is used to calculate the target opening degree of the steam bypass valve based on the comparison result using a preset control algorithm, and generate corresponding adjustment instructions, including: The algorithm selection submodule is used to select an applicable target control algorithm from the preset control algorithms based on the adjustment urgency level and suggested adjustment direction in the comparison results. The opening calculation submodule is used to calculate the preliminary target opening of the steam bypass valve based on the selected target control algorithm, the real-time deviation between the predicted concentration value and the target threshold, and the trend of dissolved oxygen concentration change from the dissolved oxygen prediction unit. The constraint processing submodule is used to limit and smooth the initial target opening based on the steam system pressure safety limit and the valve action rate limit, generate the final target opening, and generate the adjustment command containing the target opening and the expected execution time based on the target opening.

[0011] In some embodiments of this application, the instruction sending module is configured to calculate an instruction sending time earlier than the preset start time of the environmental protection equipment, and automatically send the adjustment instruction to the execution unit when the instruction sending time is reached, including: The dynamic delay calculation submodule is used to calculate the estimated total delay time required for the command to take effect from being sent to the valve, based on the expected execution time contained in the regulation command and the historical average response delay of the steam bypass valve. The optimal timing decision submodule is used to subtract the estimated total delay time and a dynamic safety margin from the preset start time of the environmental protection equipment to obtain the instruction sending time; wherein, the dynamic safety margin is automatically adjusted according to the current steam system pressure fluctuation. The triggering and sending submodule is used to automatically trigger and send the adjustment command to the execution unit when the system clock reaches the command sending time.

[0012] In some embodiments of this application, the strategy switching module automatically switches the control mode from feedforward control based on the predicted concentration value to feedback closed-loop control based on real-time dissolved oxygen concentration measurement value, including: The switching timing determination submodule is used to continuously monitor the stability of the real-time dissolved oxygen concentration measurement value after the environmental protection equipment is started. When the standard deviation of the measured value fluctuates below the preset stability threshold over several consecutive sampling periods, the system is determined to have entered a switchable state and a switching trigger signal is generated. The post-switch verification and rollback submodule is used to continuously verify the effectiveness of the feedback control loop after the switch is completed and the feedback closed-loop control is entered. If the dissolved oxygen concentration cannot be stably controlled within the target range within the preset time, an alarm will be automatically generated and the system will revert to the feedforward-feedback hybrid control mode based on the latest predicted data.

[0013] In some embodiments of this application, the execution unit, configured to respond to and execute the adjustment command, adjusts the opening degree of the steam bypass valve supplying steam to the deaerator, including: The instruction receiving module is used to receive the adjustment instruction from the timing control unit; The drive control module is used to parse the adjustment command and generate the corresponding valve drive signal; A valve actuation module is used to respond to the valve actuation signal and drive the steam bypass valve to the target opening degree. The status feedback module is used to collect the actual opening information of the steam bypass valve and feed the actual opening information back to the timing control unit.

[0014] In some embodiments of this application, the deoxygenation control method based on synchronous regulation includes: Acquire and confirm the start-up preparation status signal of environmental protection equipment in real time; Based on the startup preparation status signal, and using historical operating data and the deaerator mass transfer mechanism model, the dissolved oxygen concentration of the deaerator outlet feedwater at a specific future time point is predicted to obtain the predicted concentration value. Based on the start-up preparation status signal and the predicted concentration value, a regulation command for adjusting the steam bypass valve is generated, and the regulation command is sent to the execution unit within a preset time before the start-up of the environmental protection equipment. In response to and execution of the regulation command, the opening degree of the steam bypass valve supplying steam to the deaerator is adjusted.

[0015] The deoxygenation control system and method based on synchronous regulation according to the embodiments of this application have the following advantages compared with the prior art: By integrating historical data with mass transfer mechanism models to predict dissolved oxygen concentration and accurately calculating the command sending time based on the preset start-up time of environmental protection equipment, synchronous adjustment of steam valves is achieved before equipment start-up, fundamentally solving the adjustment lag problem of traditional feedback control and ensuring that the dissolved oxygen concentration of the feed water meets the standard requirements at the moment of equipment start-up.

[0016] By using feedforward predictive control, drastic fluctuations in water quality caused by excessive dissolved oxygen concentration during the initial startup of the equipment were avoided. This effectively reduced the risk of internal corrosion of the equipment, extended the service life of key equipment, and ensured the stability of the environmental protection system during startup and operation. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the deoxygenation control system based on synchronous regulation in an embodiment of this application; Detailed Implementation

[0018] The specific embodiments of this application will be described in further detail below with reference to the accompanying drawings and examples. The following examples are used to illustrate this application, but are not intended to limit the scope of this application.

[0019] In the description of this application, it should be understood that the terms "center", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application.

[0020] The terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this application, unless otherwise stated, "a plurality of" means two or more.

[0021] In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection between two components. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0022] like Figure 1 As shown, the deoxygenation control system based on synchronous regulation in this application includes: The data acquisition unit is used to acquire and confirm the start-up preparation status signal of the environmental protection equipment in real time; The dissolved oxygen prediction unit is used to predict the dissolved oxygen concentration of the deaerator outlet feedwater at a specific future time point based on the start-up preparation state signal, historical operating data, and the deaerator mass transfer mechanism model, and output the predicted concentration value. The timing control unit is used to generate an adjustment command based on the start-up preparation state signal and the predicted concentration value, and send the adjustment command to the execution unit within a preset time before the start of the environmental protection equipment. An execution unit is used to respond to and execute the regulation command, and to regulate the opening degree of the steam bypass valve supplying steam to the deaerator.

[0023] In some embodiments of this application, the data acquisition unit is used to acquire and confirm the start-up preparation status signal of the environmental protection equipment in real time, including: The signal acquisition module is used to acquire multiple signals that characterize the start-up preparation state of the environmental protection equipment; The signal processing module is used to perform logical verification, timing analysis and validity determination on the multiple signals, and generate determination results; The logic arbitration module is used to confirm and output the start-up preparation state signal when the determination result shows that the multiple signals are consistent and valid in logic and timing. When the determination result shows that there is inconsistency among the multiple signals, the pre-stored historical operating parameter sequence and operating mode are logically arbitrated, and the arbitrated start-up preparation status signal is output.

[0024] In this embodiment, the multiple signals include digital commands, analog signals, and device status feedback signals.

[0025] In this embodiment, logic verification refers to the system performing a Boolean logic consistency check on the multiple acquired signals. When the system start command is true, it verifies whether related status signals such as the circulating pump being running and the water tank level being normal are also true, in order to eliminate logical contradictions caused by signal line faults or sensor errors.

[0026] In this embodiment, timing analysis refers to analyzing whether the sequence of changes in the states of multiple signals conforms to the predetermined device startup process sequence. For example, analyzing whether the relevant temperature rise signal appears within a reasonable time window after the preheating command is issued, in order to determine whether the startup process proceeds as expected.

[0027] In this embodiment, validity determination refers to judging whether a single signal or a combination of signals is real, reliable, and within a valid range based on rules such as the physical range, rate of change, or duration of the signal. For example, determining whether a temperature signal value is within the sensor's range, or whether its short-term fluctuations exceed a reasonable noise threshold.

[0028] In this embodiment, when the determination result confirms that all signals are consistent, the timing is correct, and all are valid, the logic arbitration module will determine this moment as a reliable start-up preparation state and generate a high-confidence start-up preparation state signal to be transmitted to the downstream unit, triggering the subsequent prediction and control process.

[0029] In this embodiment, the pre-stored historical operating parameter sequence refers to a data set stored in the system database that records the changes of key parameters over time under similar past operating conditions. These sequences provide a historical reference benchmark for arbitration.

[0030] In this embodiment, the operating mode refers to a set of rules and parameters predefined by the system according to the operating conditions, such as cold start, warm start, and hot start, which are used to characterize different equipment operating states.

[0031] In this embodiment, logical arbitration refers to the process where, when multiple signals are inconsistent or partially invalid, the logical arbitration module does not simply report an error, but actively invokes a pre-stored sequence of historical operating parameters and operating modes that match the current time and environment. By comparing historical modes, it intelligently infers the most likely true device state, or makes reasonable substitutions or supplements for missing / contradictory signals, thereby making a decision.

[0032] In this embodiment, the arbitrated startup preparation status signal refers to a revised or supplemented startup preparation status signal output by the system after a logical arbitration process, inferred from historical data and rules. This ensures that even in the event of some abnormal field signals, the system can still continue to operate based on the best estimate, rather than completely stopping, greatly enhancing the system's robustness and fault tolerance.

[0033] In some embodiments of this application, the dissolved oxygen prediction unit is used to predict the dissolved oxygen concentration of the deaerator outlet feedwater at a specific future time point based on the start-up preparation state signal, historical operating data, and a deaerator mass transfer mechanism model, and output the predicted concentration value, including: The data extraction module is used to extract a sequence of historical operating parameters that matches the current operating condition from the historical operating database based on the start-up preparation state signal. The prediction model module is used to construct and run a dynamic prediction model of dissolved oxygen concentration based on the historical operating parameter sequence and the mass transfer mechanism of the deaerator, and to predict the trend of dissolved oxygen concentration change in the deaerator outlet feedwater within a specific time window in the future. The output and optimization module is used to determine and output the predicted concentration value for a specific future time point from the dissolved oxygen concentration change trend based on the preset start time of the environmental protection equipment. The output and optimization module is further used to compare the predicted concentration value with the real-time monitored dissolved oxygen concentration measurement value, dynamically optimize the parameters of the dynamic prediction model of dissolved oxygen concentration based on the deviation, and send the optimized prediction result to the timing control unit.

[0034] In this embodiment, extracting historical operating parameter sequences that match the current operating conditions from the historical operating database means that after receiving a valid start-up preparation signal, the system immediately matches the current environmental conditions, equipment initial state, and preset start-up mode, intelligently retrieving and extracting complete operating data sequences recorded under similar initial conditions from a large amount of historical operating data. These sequences typically include time-varying curves of key parameters such as steam flow rate, feedwater flow rate, pressure, and temperature, providing a data foundation most comparable to the current operating conditions for subsequent predictions.

[0035] In this embodiment, the historical operating parameter sequence provides the actual output response data of the system under specific inputs, reflecting the statistical regularity and operating characteristics of the system. The deaerator mass transfer mechanism refers to the physicochemical principles describing the process of dissolved oxygen migrating from water to the steam phase for removal. It is typically based on mathematical models established using Henry's Law, two-film theory, etc., describing the intrinsic physical relationship between variables such as temperature, pressure, steam flow rate, and water flow rate and the deaeration rate. The predictive model combines these two aspects: it uses the mechanistic model to build the predictive framework and uses historical data to correct the coefficients in the model, ensuring that the model conforms to physical laws while closely reflecting the actual operating characteristics of the equipment.

[0036] In this embodiment, the construction of the dissolved oxygen concentration dynamic prediction model includes: based on the mass transfer mechanism of the deaerator, establishing a state-space model with steam bypass valve opening, feedwater flow rate, and inlet dissolved oxygen concentration as inputs, and deaerator outlet dissolved oxygen concentration as output. Using extracted historical operating parameter sequences as training data, techniques such as system identification, parameter estimation, and data assimilation are employed to fit and calibrate the unknown parameters or functional relationships in the mechanism model, thereby obtaining a dissolved oxygen concentration dynamic prediction model that accurately reflects the dynamic characteristics of the equipment. Essentially, this model is a computer simulation program capable of predicting future state changes based on current inputs.

[0037] In this embodiment, predicting the trend of dissolved oxygen concentration change in the deaerator outlet feedwater within a specific future time window means that after the model is built, the system uses the currently collected real-time parameters and the future control input sequence set based on the startup plan as inputs to the model. By running this dynamic model for digital simulation, the model calculates a complete curve showing how the outlet dissolved oxygen concentration evolves step by step over time from the current moment within a preset future time window, i.e., the dissolved oxygen concentration change trend. This trend line visually demonstrates the natural decay or change process of dissolved oxygen concentration without intervention.

[0038] In this embodiment, the preset start-up time of the environmental protection equipment refers to the specific future time when the environmental protection equipment is scheduled to be put into operation, which is set by the operators or issued by the upper-level control system.

[0039] In this embodiment, determining and outputting the predicted concentration value corresponding to a specific future time point means that the system reads the concentration value at that time point from the predicted dissolved oxygen concentration change trend curve, which perfectly corresponds to the preset start-up time of the environmental protection equipment. This value is the predicted dissolved oxygen concentration at the future start-up time, and it is sent as a key output to the timing control unit for decision-making.

[0040] In this embodiment, comparing the predicted concentration value with the real-time monitored dissolved oxygen concentration measurement value means that the system continuously receives real-time monitored dissolved oxygen concentration measurements from the online dissolved oxygen analyzer installed at the deaerator outlet during operation. The comparison process is time-aligned: the system compares the predicted value made for an earlier future time with the actual value measured when that future time actually arrives, and calculates the deviation between the two. For example, if the concentration at time T2 is predicted at time T1, when the system clock reaches time T2, the predicted value at time T1 is compared with the actual measured value at time T2.

[0041] In this embodiment, the parameter optimization of the dissolved oxygen concentration dynamic prediction model based on the deviation refers to the deviation generated by the above comparison, reflecting the error between the model prediction and the actual process. The system utilizes this deviation to automatically and fine-tune the key parameters in the prediction model through an adaptive algorithm. This is a continuous learning and correction process, enabling the model to track characteristic drift caused by equipment scaling, aging, or seasonal changes, thereby maintaining and continuously improving the accuracy of long-term predictions. The optimized model parameters will be used in subsequent prediction cycles.

[0042] In some embodiments of this application, the timing control unit is configured to generate an adjustment command based on the start-up preparation state signal and the predicted concentration value, and send the adjustment command to the execution unit within a preset time before the start-up of the environmental protection equipment, including: The comparison module is used to compare the predicted concentration value with a preset dissolved oxygen concentration threshold after receiving a valid start-up preparation state signal, and generate a comparison result. The instruction generation module is used to calculate the target opening degree of the steam bypass valve based on the comparison result using a preset control algorithm, and generate corresponding adjustment instructions. The instruction sending module is used to calculate the instruction sending time that is earlier than the preset start time of the environmental protection equipment, and automatically send the adjustment instruction to the execution unit when the instruction sending time is reached; The strategy switching module automatically switches the control mode from feedforward control based on the predicted concentration value to feedback closed-loop control based on the real-time dissolved oxygen concentration measurement value.

[0043] In some embodiments of this application, the comparison module is used to compare the predicted concentration value with a preset dissolved oxygen concentration threshold after receiving a valid start-up preparation state signal, and generate a comparison result, including: The threshold setting submodule is used to dynamically call the applicable preset dissolved oxygen concentration threshold from the pre-stored threshold mapping table based on the preset start time of the environmental protection equipment, the current water supply temperature and the historical operating conditions of the same period. A multi-level comparison submodule is used to perform multi-level comparisons between the predicted concentration value and the dynamically generated preset dissolved oxygen concentration threshold. The multi-level comparisons include at least: The predicted concentration value is compared with the first-level warning threshold to determine whether adjustment is needed. The predicted concentration value is compared with the secondary target threshold to generate a level signal characterizing the urgency of regulation; The result generation submodule is used to generate a comparison result that includes whether adjustment is needed, the urgency level of adjustment, and the suggested adjustment direction, and sends the comparison result to the instruction generation module.

[0044] In this embodiment, the threshold setting submodule dynamically retrieves the applicable preset dissolved oxygen concentration threshold from a pre-stored threshold mapping table based on the preset start-up time of the environmental protection equipment, the current water supply temperature, and historical operating conditions. This ensures that the control standard can adapt to real-time changes in operating conditions.

[0045] In this embodiment, the thresholds include a primary warning threshold and a secondary target threshold. The primary warning threshold is mainly derived from process safety regulations or equipment protection requirements. Its core function is to determine whether adjustment is necessary. When the predicted concentration does not exceed this threshold, it indicates a low water quality risk, and the system may require no action or only minor adjustments; once it exceeds this threshold, it triggers a decision requiring adjustment. The secondary target threshold is based on optimized operation targets and is used to finely measure deviations. The multi-level comparison submodule generates a level signal characterizing the urgency of adjustment by comparing the predicted value with the secondary target threshold. Low urgency level: The predicted value is slightly higher than the target threshold, the deviation is small and the change is gradual, indicating sufficient time for gentle adjustment. Medium urgency level: The predicted value is significantly higher than the target threshold, or the deviation shows an increasing trend, indicating a need for rapid and clear adjustment. High urgency level: The predicted value far exceeds the target threshold, or is rapidly approaching the primary warning threshold, indicating an immediate need for large-scale and rapid adjustment to prevent exceeding the limit at startup. This level reflects the adjustment response speed and intensity required by the magnitude and trend of the deviation.

[0046] In this embodiment, the result generation submodule ultimately generates a comparison result that includes whether adjustment is needed, the urgency level of adjustment, and the suggested adjustment direction. Whether adjustment is needed is determined by whether the first-level warning threshold is exceeded; the urgency level of adjustment is determined by the deviation from the second-level target threshold; the suggested adjustment direction is directly given by the level of the predicted value relative to the threshold. If the predicted value is higher than the target, the direction is to increase the steam valve opening to enhance deoxygenation; if the predicted value is lower than the target and has a margin, the direction may be to maintain or slightly reduce the opening to save energy. This structured result is the core input of the instruction generation module.

[0047] In some embodiments of this application, the instruction generation module is used to calculate the target opening degree of the steam bypass valve based on the comparison result using a preset control algorithm, and generate corresponding adjustment instructions, including: The algorithm selection submodule is used to select an applicable target control algorithm from the preset control algorithms based on the adjustment urgency level and suggested adjustment direction in the comparison results. The opening calculation submodule is used to calculate the preliminary target opening of the steam bypass valve based on the selected target control algorithm, the real-time deviation between the predicted concentration value and the target threshold, and the trend of dissolved oxygen concentration change from the dissolved oxygen prediction unit. The constraint processing submodule is used to limit and smooth the initial target opening based on the steam system pressure safety limit and the valve action rate limit, generate the final target opening, and generate the adjustment command containing the target opening and the expected execution time based on the target opening.

[0048] In this embodiment, the algorithm selection submodule selects a suitable target control algorithm from preset control algorithms based on the adjustment urgency level and suggested adjustment direction in the comparison results. The system has preset multiple target control algorithms, and the selection logic ensures that the control strategy matches the urgency level and adjustment direction.

[0049] In this embodiment, the opening calculation submodule runs the selected algorithm to calculate the preliminary target opening of the steam bypass valve. Its core is to comprehensively consider the real-time deviation between the predicted concentration value and the target threshold, as well as the trend of dissolved oxygen concentration changes, as two inputs, and calculate the theoretically optimal opening using the algorithm formula.

[0050] In this embodiment, the constraint processing submodule performs safety processing on the initial opening degree. Based on the steam system pressure safety limits and valve actuation rate limits, it limits and smooths the initial target opening degree. Limiting ensures the opening command remains within physically safe limits, while smoothing prevents sudden command changes and ensures a smooth process.

[0051] In some embodiments of this application, the instruction sending module is configured to calculate an instruction sending time earlier than the preset start time of the environmental protection equipment, and automatically send the adjustment instruction to the execution unit when the instruction sending time is reached, including: The dynamic delay calculation submodule is used to calculate the estimated total delay time required for the command to take effect from being sent to the valve, based on the expected execution time contained in the regulation command and the historical average response delay of the steam bypass valve. The optimal timing decision submodule is used to subtract the estimated total delay time and a dynamic safety margin from the preset start time of the environmental protection equipment to obtain the instruction sending time; wherein, the dynamic safety margin is automatically adjusted according to the current steam system pressure fluctuation. The triggering and sending submodule is used to automatically trigger and send the adjustment command to the execution unit when the system clock reaches the command sending time.

[0052] In this embodiment, the dynamic delay calculation submodule is responsible for quantifying the time cost of the action process. Based on the expected execution time included in the control command and the historical average response delay of the steam bypass valve, it calculates the estimated total delay time required for the command to take effect from being sent to the valve. This time is the sum of the response delay and the mechanical execution time.

[0053] In this embodiment, the optimal timing decision submodule is responsible for determining the precise timing of sending the instruction. It subtracts the estimated total delay time and a dynamic safety margin from the preset start-up time of the environmental protection equipment to obtain the instruction sending time. The dynamic safety margin is automatically adjusted based on the current steam system pressure fluctuations; it increases to ensure safety when the system is unstable and decreases to achieve precise synchronization when the system is stable.

[0054] In this embodiment, the triggering and sending submodule is the final actuator. When the system clock reaches the instruction sending time, it automatically triggers and sends the adjustment instruction to the execution unit, thereby completing the last link of the entire feedforward control chain and ensuring that the adjustment action takes effect precisely at the preset start time.

[0055] In some embodiments of this application, the strategy switching module automatically switches the control mode from feedforward control based on the predicted concentration value to feedback closed-loop control based on real-time dissolved oxygen concentration measurement value, including: The switching timing determination submodule is used to continuously monitor the stability of the real-time dissolved oxygen concentration measurement value after the environmental protection equipment is started. When the standard deviation of the measured value fluctuates below the preset stability threshold over several consecutive sampling periods, the system is determined to have entered a switchable state and a switching trigger signal is generated. The post-switch verification and rollback submodule is used to continuously verify the effectiveness of the feedback control loop after the switch is completed and the feedback closed-loop control is entered. If the dissolved oxygen concentration cannot be stably controlled within the target range within the preset time, an alarm will be automatically generated and the system will revert to the feedforward-feedback hybrid control mode based on the latest predicted data.

[0056] In this embodiment, the switching timing determination submodule continuously monitors the stability of the real-time dissolved oxygen concentration measurement value after the device is started, and determines that the system has entered the switchable state and generates a switching trigger signal only when the standard deviation of the fluctuation within several consecutive sampling periods is lower than the preset stability threshold. This ensures that the switching action is only performed when the system is running smoothly, avoiding switching shocks.

[0057] In this embodiment, the post-switch verification and rollback submodule continuously verifies the effectiveness of the feedback control loop after the switch is completed and the system enters the feedback closed-loop control. If the dissolved oxygen concentration cannot be stably controlled within the target range within a preset time, it indicates that the feedback control may have failed. The module will automatically generate an alarm and roll back to the feedforward-feedback hybrid control mode based on the latest predicted data. This mechanism provides safety redundancy for the control strategy. When the conventional feedback control is ineffective, the system can intelligently revert to the more reliable hybrid control mode, ensuring the continuous reliability of water quality control.

[0058] In some embodiments of this application, the execution unit, configured to respond to and execute the adjustment command, adjusts the opening degree of the steam bypass valve supplying steam to the deaerator, including: The instruction receiving module is used to receive the adjustment instruction from the timing control unit; The drive control module is used to parse the adjustment command and generate the corresponding valve drive signal; A valve actuation module is used to respond to the valve actuation signal and drive the steam bypass valve to the target opening degree. The status feedback module is used to collect the actual opening information of the steam bypass valve and feed the actual opening information back to the timing control unit.

[0059] In this embodiment, the instruction receiving module establishes a connection channel through the standard communication protocol of the industrial control system. Its main functions include: listening for and receiving adjustment instruction data packets sent by the timing control unit at precisely calculated instruction transmission times; performing integrity verification and format verification on the received data packets to ensure that no errors or loss occur during instruction transmission, laying the foundation for reliable execution subsequently.

[0060] In this embodiment, the drive control module parses the adjustment command and extracts key control parameters, primarily the target opening degree and expected execution time. Based on these parameters, the module generates a corresponding valve drive signal through its built-in control logic. The form of this signal depends on the type of valve actuator; it may be an analog signal, a pulse signal, or a specific communication message, the content of which precisely corresponds to the final position the valve needs to reach and the recommended movement speed.

[0061] In this embodiment, the valve drive module responds to the valve drive signal. The module drives the actuator of the steam bypass valve to produce a precise linear or rotary displacement, ultimately moving the valve core to the target opening required by the command.

[0062] In this embodiment, the status feedback module collects the actual opening information of the steam bypass valve in real time through a position sensor installed on the valve actuator. This actual opening information is then fed back to the timing control unit. On one hand, this allows the timing control unit to know whether the command has been executed correctly, verifying the effectiveness of the feedforward control; on the other hand, after the system switches to feedback control mode, the actual valve position is a crucial process state variable. If there is a continuous deviation between the fed-back actual opening and the target opening of the command, it may indicate problems such as valve jamming or drive failure, providing a basis for system diagnosis and maintenance.

[0063] In some embodiments of this application, the deoxygenation control method based on synchronous regulation includes: Acquire and confirm the start-up preparation status signal of environmental protection equipment in real time; Based on the startup preparation status signal, and using historical operating data and the deaerator mass transfer mechanism model, the dissolved oxygen concentration of the deaerator outlet feedwater at a specific future time point is predicted to obtain the predicted concentration value. Based on the start-up preparation status signal and the predicted concentration value, a regulation command for adjusting the steam bypass valve is generated, and the regulation command is sent to the execution unit within a preset time before the start-up of the environmental protection equipment. In response to and execution of the regulation command, the opening degree of the steam bypass valve supplying steam to the deaerator is adjusted.

[0064] The above description is only a preferred embodiment of this application. It should be noted that for those skilled in the art, several improvements and substitutions can be made without departing from the technical principles of this application, and these improvements and substitutions should also be considered within the scope of protection of this application.

Claims

1. A deoxygenation control system based on synchronous regulation, characterized in that, include: The data acquisition unit is used to acquire and confirm the start-up preparation status signal of the environmental protection equipment in real time; The dissolved oxygen prediction unit is used to predict the dissolved oxygen concentration of the deaerator outlet feedwater at a specific future time point based on the start-up preparation state signal, historical operating data, and the deaerator mass transfer mechanism model, and output the predicted concentration value. The timing control unit is used to generate an adjustment command based on the start-up preparation state signal and the predicted concentration value, and send the adjustment command to the execution unit within a preset time before the start of the environmental protection equipment. An execution unit is used to respond to and execute the regulation command, and to regulate the opening degree of the steam bypass valve supplying steam to the deaerator.

2. The deoxygenation control system based on synchronous regulation as described in claim 1, characterized in that, The data acquisition unit is used to acquire and confirm the start-up preparation status signals of the environmental protection equipment in real time, including: The signal acquisition module is used to acquire multiple signals that characterize the start-up preparation state of the environmental protection equipment; The signal processing module is used to perform logical verification, timing analysis and validity determination on the multiple signals, and generate determination results; The logic arbitration module is used to confirm and output the start-up preparation state signal when the determination result shows that the multiple signals are consistent and valid in logic and timing. When the determination result shows that there is inconsistency among the multiple signals, the pre-stored historical operating parameter sequence and operating mode are logically arbitrated, and the arbitrated start-up preparation status signal is output.

3. The deoxygenation control system based on synchronous regulation as described in claim 2, characterized in that, The dissolved oxygen prediction unit is used to predict the dissolved oxygen concentration of the deaerator outlet feedwater at a specific future time point based on the start-up preparation state signal, historical operating data, and a deaerator mass transfer mechanism model, and outputs the predicted concentration value, including: The data extraction module is used to extract a sequence of historical operating parameters that matches the current operating condition from the historical operating database based on the start-up preparation state signal. The prediction model module is used to construct and run a dynamic prediction model of dissolved oxygen concentration based on the historical operating parameter sequence and the mass transfer mechanism of the deaerator, and to predict the trend of dissolved oxygen concentration change in the deaerator outlet feedwater within a specific time window in the future. The output and optimization module is used to determine and output the predicted concentration value for a specific future time point from the dissolved oxygen concentration change trend based on the preset start time of the environmental protection equipment. The output and optimization module is further used to compare the predicted concentration value with the real-time monitored dissolved oxygen concentration measurement value, dynamically optimize the parameters of the dynamic prediction model of dissolved oxygen concentration based on the deviation, and send the optimized prediction result to the timing control unit.

4. The deoxygenation control system based on synchronous regulation as described in claim 3, characterized in that, A timing control unit, configured to generate an adjustment command based on the start-up preparation state signal and the predicted concentration value, and to send the adjustment command to the execution unit within a preset time before the start-up of the environmental protection equipment, comprising: The comparison module is used to compare the predicted concentration value with a preset dissolved oxygen concentration threshold after receiving a valid start-up preparation state signal, and generate a comparison result. The instruction generation module is used to calculate the target opening degree of the steam bypass valve based on the comparison result using a preset control algorithm, and generate corresponding adjustment instructions. The instruction sending module is used to calculate the instruction sending time that is earlier than the preset start time of the environmental protection equipment, and automatically send the adjustment instruction to the execution unit when the instruction sending time is reached; The strategy switching module automatically switches the control mode from feedforward control based on the predicted concentration value to feedback closed-loop control based on the real-time dissolved oxygen concentration measurement value.

5. The deoxygenation control system based on synchronous regulation as described in claim 4, characterized in that, The comparison module, upon receiving a valid start-up preparation state signal, compares the predicted concentration value with a preset dissolved oxygen concentration threshold to generate a comparison result, including: The threshold setting submodule is used to dynamically call the applicable preset dissolved oxygen concentration threshold from the pre-stored threshold mapping table based on the preset start time of the environmental protection equipment, the current water supply temperature and the historical operating conditions of the same period. A multi-level comparison submodule is used to perform multi-level comparisons between the predicted concentration value and the dynamically generated preset dissolved oxygen concentration threshold. The multi-level comparisons include at least: The predicted concentration value is compared with the first-level warning threshold to determine whether adjustment is needed. The predicted concentration value is compared with the secondary target threshold to generate a level signal characterizing the urgency of regulation; The result generation submodule is used to generate a comparison result that includes whether adjustment is needed, the urgency level of adjustment, and the suggested adjustment direction, and sends the comparison result to the instruction generation module.

6. The deoxygenation control system based on synchronous regulation as described in claim 5, characterized in that, The instruction generation module is used to calculate the target opening degree of the steam bypass valve based on the comparison result using a preset control algorithm, and generate corresponding adjustment instructions, including: The algorithm selection submodule is used to select an applicable target control algorithm from the preset control algorithms based on the adjustment urgency level and suggested adjustment direction in the comparison results. The opening calculation submodule is used to calculate the preliminary target opening of the steam bypass valve based on the selected target control algorithm, the real-time deviation between the predicted concentration value and the target threshold, and the trend of dissolved oxygen concentration change from the dissolved oxygen prediction unit. The constraint processing submodule is used to limit and smooth the initial target opening based on the steam system pressure safety limit and the valve action rate limit, generate the final target opening, and generate the adjustment command containing the target opening and the expected execution time based on the target opening.

7. The deoxygenation control system based on synchronous regulation as described in claim 6, characterized in that, The instruction sending module is used to calculate an instruction sending time earlier than the preset start time of the environmental protection equipment, and automatically send the adjustment instruction to the execution unit when the instruction sending time is reached, including: The dynamic delay calculation submodule is used to calculate the estimated total delay time required for the command to take effect from being sent to the valve, based on the expected execution time contained in the regulation command and the historical average response delay of the steam bypass valve. The optimal timing decision submodule is used to subtract the estimated total delay time and a dynamic safety margin from the preset start time of the environmental protection equipment to obtain the instruction sending time; wherein, the dynamic safety margin is automatically adjusted according to the current steam system pressure fluctuation. The triggering and sending submodule is used to automatically trigger and send the adjustment command to the execution unit when the system clock reaches the command sending time.

8. The deoxygenation control system based on synchronous regulation as described in claim 7, characterized in that, The strategy switching module automatically switches the control mode from feedforward control based on the predicted concentration value to feedback closed-loop control based on real-time dissolved oxygen concentration measurement value, including: The switching timing determination submodule is used to continuously monitor the stability of the real-time dissolved oxygen concentration measurement value after the environmental protection equipment is started. When the standard deviation of the fluctuation of the measured value is lower than the preset stability threshold over several consecutive sampling periods, the system is determined to have entered the switchable state and a switching trigger signal is generated. The post-switch verification and rollback submodule is used to continuously verify the effectiveness of the feedback control loop after the switch is completed and the feedback closed-loop control is entered. If the dissolved oxygen concentration cannot be stably controlled within the target range within the preset time, an alarm will be automatically generated and the system will revert to the feedforward-feedback hybrid control mode based on the latest predicted data.

9. The deoxygenation control system based on synchronous regulation as described in claim 7, characterized in that, An execution unit, configured to respond to and execute the regulation command, and regulate the opening degree of the steam bypass valve supplying steam to the deaerator, includes: The instruction receiving module is used to receive the adjustment instruction from the timing control unit; The drive control module is used to parse the adjustment command and generate the corresponding valve drive signal; A valve actuation module is used to respond to the valve actuation signal and drive the steam bypass valve to the target opening degree. The status feedback module is used to collect the actual opening information of the steam bypass valve and feed the actual opening information back to the timing control unit.

10. A deoxygenation control method based on synchronous regulation, characterized in that, include: Acquire and confirm the start-up preparation status signal of environmental protection equipment in real time; Based on the startup preparation status signal, and using historical operating data and the deaerator mass transfer mechanism model, the dissolved oxygen concentration of the deaerator outlet feedwater at a specific future time point is predicted to obtain the predicted concentration value. Based on the start-up preparation status signal and the predicted concentration value, a regulation command for adjusting the steam bypass valve is generated, and the regulation command is sent to the execution unit within a preset time before the start-up of the environmental protection equipment. In response to and execution of the regulation command, the opening degree of the steam bypass valve supplying steam to the deaerator is adjusted.

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