A self-adapting steam deoxidization and waste heat recovery collaborative control device
By using an adaptive steam deaerator and waste heat recovery synergistic control device to dynamically adjust condensation parameters, the problem of low waste heat recovery efficiency in steam deaerators is solved, achieving efficient waste heat recovery and energy utilization.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Patents(China)
- Current Assignee / Owner
- HEBEI YUANDA ZHONGZHENG BIOLOGICAL TECH CO LTD
- Filing Date
- 2026-01-27
- Publication Date
- 2026-06-05
Smart Images
Figure CN121782562B_ABST
Abstract
Description
Technical Field
[0001] This application relates to the field of waste heat recovery technology, specifically to an adaptive steam deoxygenation and waste heat recovery synergistic control device. Background Technology
[0002] Steam deaeration is widely used in industrial production, such as boiler feedwater treatment and corrosion prevention in thermal systems. Traditional steam deaeration devices remove dissolved oxygen from water by heating and diffusing steam to prevent corrosion of pipes and equipment. However, the large amount of high-temperature steam generated during operation is usually directly discharged into the atmosphere or treated by simple condensation, resulting in a significant amount of waste heat not being effectively recovered and utilized, leading to energy waste. Steam deaeration devices employ multi-stage steam diffusion structures to improve deaeration efficiency. However, the steam parameters (such as temperature, pressure, and flow rate) differ between different diffusion stages, and existing waste heat recovery systems use fixed condensation parameters, which cannot be dynamically adjusted according to the actual operating conditions of the steam deaeration device, resulting in low waste heat recovery efficiency and energy utilization efficiency.
[0003] Therefore, current technologies suffer from problems such as low waste heat recovery efficiency of steam deaerators and fixed condensation parameters that cannot adapt to different steam diffusion levels. Summary of the Invention
[0004] This application provides an adaptive steam deoxygenation and waste heat recovery coordinated control device, which solves the technical problems of low waste heat recovery efficiency and fixed condensation parameters in existing steam deoxygenation devices that cannot adapt to different steam diffusion levels. It achieves the technical effects of intelligently adjusting condensation parameters according to the steam deoxygenation operation status, efficiently recovering waste heat, improving energy utilization efficiency, and ensuring the stability of steam deoxygenation.
[0005] This application provides an adaptive steam deoxygenation and waste heat recovery coordinated control device, the device comprising: a steam deoxygenation device, the steam deoxygenation device including a steam diffuser and a spray module, the steam diffuser being provided with a primary steam diffusion layer and a secondary steam diffusion layer; a waste heat recovery device, the waste heat recovery chamber of the waste heat recovery device being connected to the exhaust channel of the steam deoxygenation device, the waste heat recovery device including a condensation module; a communication connection module, establishing a communication connection between the steam deoxygenation device and the waste heat recovery device, and collecting the steam diffusion layer tags used by the steam diffuser to perform steam deoxygenation treatment on the inlet water of the spray module; and a condensation parameter control module, transmitting the steam diffusion layer tags to the control terminal of the waste heat recovery device, adaptively analyzing the condensation control parameters based on the steam diffusion layer tags, outputting condensation control parameters, and using the condensation control parameters to control the condensation module to recover the high-temperature steam discharged from the steam deoxygenation device.
[0006] In a possible implementation, the adaptive steam deoxygenation and waste heat recovery coordinated control device further performs the following processing: the primary steam diffusion layer is connected to the steam box at a first height through a steam regulating valve and a steam inlet pipe to form a primary deoxygenation region; the secondary steam diffusion layer is connected to the steam box at a second height through a steam regulating valve and a steam inlet pipe to form a secondary deoxygenation region; wherein, the deoxygenation intensity of the primary deoxygenation region is less than that of the secondary deoxygenation region.
[0007] In a possible implementation, the adaptive steam deoxygenation and waste heat recovery coordinated control device further performs the following processing: the deoxygenation intensity includes steam flow rate and steam temperature; wherein, the steam regulating valve is used to regulate the steam flow rate introduced into the primary steam diffusion layer and the secondary steam diffusion layer through the steam inlet pipe, and the steam temperature introduced into the primary steam diffusion layer and the secondary steam diffusion layer is regulated by controlling the temperature of the steam box.
[0008] In a possible implementation, the adaptive steam deoxygenation and waste heat recovery coordinated control device further performs the following processing: the primary steam diffusion layer further includes a first diffusion plate, and the secondary steam diffusion layer further includes a second diffusion plate, wherein the pore size of the first diffusion plate is larger than the pore size of the second diffusion plate.
[0009] In a possible implementation, the adaptive steam deoxygenation and waste heat recovery coordinated control device further performs the following processing: wherein the steam diffusion layer label includes a primary diffusion layer start label, a secondary diffusion layer start label, and a combined diffusion layer start label; wherein the combined diffusion layer start label is a label for the step-by-step start-up processing of the primary steam diffusion layer and the secondary steam diffusion layer.
[0010] In a possible implementation, the adaptive steam deoxygenation and waste heat recovery coordinated control device further performs the following processing: the condensation parameter control module includes a hierarchical driving model, which includes a tag parsing unit, a control mode matching unit, and a condensation parameter generation unit; the hierarchical driving model is downloaded to the control terminal of the waste heat recovery device; the tag parsing unit parses the received steam diffusion layer tags to obtain the condensation control mode of the control mode matching unit; under the condensation control mode, the condensation parameter generation unit performs adaptive analysis and outputs condensation control parameters.
[0011] In a possible implementation, the adaptive steam deoxygenation and waste heat recovery coordinated control device further performs the following processing: the tag parsing unit parses and predicts the steam diffusion discharge data corresponding to the steam diffusion layer tag, the steam diffusion discharge data including the temperature and flow rate of the discharged steam; reads the preset condensation control template corresponding to the condensation control mode, the preset condensation control template including the preset condensation target temperature, the preset condensate flow rate, and the condensate flow velocity; performs adaptive analysis based on the steam diffusion discharge data and the preset condensation control template, and outputs condensation control parameters.
[0012] In a possible implementation, the adaptive steam deoxygenation and waste heat recovery coordinated control device further performs the following processing: the tag parsing unit includes a steam diffusion prediction model, and training the steam diffusion prediction model includes: collecting first steam diffusion control data samples and second steam diffusion control data samples corresponding to the first-level steam diffusion layer and the second-level steam diffusion layer, respectively; detecting first steam diffusion discharge data samples and second steam diffusion discharge data samples corresponding to the first steam diffusion control data samples and the second steam diffusion control data samples; fitting the mapping relationships between the first steam diffusion control data samples and the second steam diffusion control data samples and the first steam diffusion discharge data samples and the second steam diffusion discharge data samples, respectively, and training the steam diffusion prediction model based on the mapping relationships; the tag parsing unit obtains the steam diffusion layer tag, obtains the diffusion control data corresponding to the steam diffusion layer tag, and predicts the steam diffusion discharge data corresponding to the diffusion control data based on the steam diffusion prediction model.
[0013] In a possible implementation, the adaptive steam deoxygenation and waste heat recovery coordinated control device also performs the following processing: the control mode matching unit includes a single-stage condensation control mode and a multi-stage condensation control mode.
[0014] This application proposes an adaptive steam deaerator and waste heat recovery coordinated control device. The steam deaerator includes a steam diffuser and a spray module, with a primary and secondary steam diffusion layer. The waste heat recovery device has a waste heat recovery chamber connected to an exhaust channel and includes a condensation module. A communication connection module establishes a communication connection between the steam deaerator and the waste heat recovery device. A condensation parameter control module adaptively analyzes the condensation control parameters based on the steam diffusion layer labels, outputs the condensation control parameters, and recovers the high-temperature steam discharged from the steam deaerator. This solves the technical problems of low waste heat recovery efficiency and fixed condensation parameters in existing steam deaerators, which cannot adapt to different steam diffusion layer operating conditions. It achieves the technical effects of intelligently adjusting condensation parameters according to the steam deaerator operating status, efficiently recovering waste heat, improving energy utilization efficiency, and ensuring the stability of steam deaerator operation. Attached Figure Description
[0015] To more clearly illustrate the technical solutions of the embodiments of this disclosure, the accompanying drawings of the embodiments of this disclosure will be briefly described below. Flowcharts are used in this application to illustrate the operations performed by the apparatus according to the embodiments of this application. It should be understood that the preceding or following operations are not necessarily performed precisely in sequence. Instead, various steps can be processed in reverse order or simultaneously as needed. Furthermore, other operations can be added to these processes, or one or more steps can be removed from these processes.
[0016] Figure 1 This is a schematic diagram illustrating the principle connection of an adaptive steam deoxygenation and waste heat recovery coordinated control device provided in an embodiment of this application.
[0017] Figure 2 This is a schematic diagram of the execution flow of an adaptive steam deoxygenation and waste heat recovery coordinated control process provided in an embodiment of this application.
[0018] Explanation of reference numerals in the attached drawings: Steam deaerator 1, Steam diffuser 11, Spray module 12, Discharge pipe 13, Steam regulating valve 111, Primary steam diffusion layer 112, Secondary steam diffusion layer 113, Waste heat recovery device 2, Waste heat recovery chamber 21, Condensation module 22, Communication connection module 3, Condensation parameter control module 4. Detailed Implementation
[0019] The above description is merely an overview of the technical solution of this application. In order to better understand the technical means of this application and to implement it in accordance with the contents of the specification, and to make the above and other objects, features and advantages of this application more obvious and understandable, specific embodiments of this application are given below.
[0020] To make the objectives, technical solutions, and advantages of this application clearer, the following detailed description of this application will be provided in conjunction with the accompanying drawings. The described embodiments should not be considered as limitations on this application. All other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.
[0021] In the following description, references to "some embodiments" describe a subset of all possible embodiments. However, it is understood that "some embodiments" can be the same or different subsets of all possible embodiments and can be combined with each other without conflict. The terms "first" and "second" are used merely to distinguish similar objects and do not represent a specific ordering of objects. The terms "comprising" and "having," and any variations thereof, are intended to cover non-exclusive inclusion. For example, a process, apparatus, product, or server that includes a series of steps or units is not necessarily limited to those steps or units explicitly listed, but may include other steps or modules not explicitly listed or inherent to these processes, products, or apparatuses. Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used herein is for the purpose of describing embodiments of this application only.
[0022] This application provides an adaptive steam deoxidation and waste heat recovery coordinated control device, such as... Figure 1 As shown, the device includes:
[0023] Steam deoxygenation device 1, the steam deoxygenation device includes a steam diffuser and a spray module, the steam diffuser is provided with a primary steam diffusion layer and a secondary steam diffusion layer.
[0024] Preferably, the steam deoxygenation device is an industrial equipment used to remove dissolved oxygen from water. Its core function is to reduce the oxygen content in water through steam heating and air stripping, preventing oxygen corrosion in boilers and pipelines of the thermal system. It includes a steam diffuser 11 and a spray module 12. The steam diffuser is the core component of the steam deoxygenation device. It achieves a highly efficient thermal deoxygenation process through a multi-stage steam distribution structure. It adopts a double-layer structure design with a primary steam diffusion layer 112 and a secondary steam diffusion layer 113. The operating temperature and steam parameters of the different diffusion layers are different, resulting in different exhaust heat. The primary steam diffusion layer, as the initial steam distribution structure, is responsible for reducing the oxygen content of the high-temperature steam. The water is initially evenly dispersed and undergoes preliminary heat exchange and oxygen removal with the water to be deoxygenated injected by the spray module, reducing most of the dissolved oxygen in the water. The secondary steam diffusion layer, as a secondary fine treatment structure, further evenly distributes and deeply deoxygenates the water-vapor mixture after the primary treatment. The deoxygenation efficiency is improved through denser steam contact, ensuring that the oxygen content of the effluent meets the standards. The spray module is used to evenly spray the water to be deoxygenated into the steam diffuser. The water to be deoxygenated is atomized and sprayed from top to bottom, passing through the secondary and primary steam diffusion layers in sequence. The steam flows in the opposite direction from bottom to top. The two diffusion layers maximize the gas-liquid mass transfer efficiency to achieve efficient deoxygenation by controlling the steam flow rate and contact area.
[0025] Waste heat recovery device 2, the waste heat recovery chamber of the waste heat recovery device is connected to the exhaust passage of the steam deoxidation device, and the waste heat recovery device includes a condensation module.
[0026] Preferably, the waste heat recovery device is a high-efficiency heat energy recovery device supporting the steam deoxidation device, mainly used to recover the waste heat of the high-temperature steam discharged during the deoxidation process and convert it into available heat energy, thereby improving the overall energy efficiency and reducing energy waste. The waste heat recovery device is connected to the exhaust passage 13 of the steam deoxidation device through the waste heat recovery chamber 21 and integrates a condensation module 22. Among them, the waste heat recovery chamber is made of corrosion-resistant material, such as 316L stainless steel, and at the same time, a flow guide plate is arranged inside to avoid air flow short-circuit and ensure uniform heat distribution. It is directly connected to the exhaust passage of the steam deoxidation device to collect the high-temperature steam discharged during the deoxidation process; the exhaust passage is a key connecting component between the steam deoxidation device and the waste heat recovery device, used to safely and efficiently transport the high-temperature steam after deoxidation treatment from the steam deoxidation device to the waste heat recovery device and maintain the internal pressure of the steam deoxidation device stable; the condensation module includes a heat exchanger and a condensate collector. Among them, the heat exchanger is of shell-and-tube or plate type structure, using cooling water or process cooling water as the refrigerant to exchange heat with the high-temperature steam; the condensate collector is used to separate and recover the condensed liquid water and return it to the boiler for recycling. Among them, the condensation module is provided with a temperature sensor and a flow meter, used to monitor the state parameters such as the temperature of the steam condensate and the flow rate of the cooling water in real time, and use the monitoring data as the core input of the closed-loop feedback to feedback to the control terminal of the waste heat recovery device.
[0027] Communication connection module 3, establish a communication connection between the steam deoxidation device and the waste heat recovery device, and collect the steam diffusion layer label used by the steam diffuser to perform steam deoxidation treatment on the water inlet of the spray module.
[0028] Preferably, the communication connection module establishes real-time data interaction between the steam deoxidation device and the waste heat recovery device. The core function is to collect and transmit the steam diffusion layer level label to achieve intelligent regulation of waste heat recovery. Specifically, as Figure 2 shown, when the steam deoxidation device is running, it automatically selects the working mode of the first-level or second-level steam diffusion layer according to the deoxidation demand, used to control the enabling state of the first-level steam diffusion layer and the second-level steam diffusion layer, and generate the corresponding diffusion layer level label. For example, Level-1 represents the working mode of the first-level steam diffusion layer, with a large steam flow and a higher temperature; Level-2 represents the working mode of the second-level steam diffusion layer, that is, the fine diffusion mode, with a low steam flow rate but more sufficient heat and mass exchange. The working state of the diffusion layer is monitored in real time through sensors or PLC controllers, and the label is transmitted to the control terminal of the waste heat recovery device through the communication connection module. Through the accurate identification and feedback of the diffusion layer level label, the whole process coordination and optimization of steam deoxidation and waste heat recovery are achieved.
[0029] The condensation parameter control module 4 transmits the steam diffusion layer tag to the control terminal of the waste heat recovery device, performs adaptive analysis on the condensation control parameters based on the steam diffusion layer tag, outputs condensation control parameters, and uses the condensation control parameters to control the condensation module to recover the high-temperature steam discharged from the steam deoxygenation device.
[0030] Preferably, the condensing parameter control module is the core intelligent control unit of the waste heat recovery device. It automatically analyzes and outputs optimal condensing control parameters based on the steam diffusion layer tags (such as primary or secondary diffusion modes) transmitted from the steam deaerator. This dynamically adjusts the operating state of the condensing module to achieve efficient waste heat recovery. Specifically, the condensing parameter control module receives diffusion layer tags from the steam deaerator, identifies the current steam flow rate, temperature, and pressure characteristics, and matches the optimal condensing strategy based on PID control or fuzzy logic. In primary diffusion mode (high-temperature, high-flow steam), it increases the cooling water flow rate or increases the heat exchange area for rapid condensation; in secondary diffusion mode (low-temperature, fine deaerator steam), it reduces the cooling intensity to avoid overcooling and energy waste. Finally, it sends the generated condensing control parameters, such as valve opening, pump speed, and fan speed, to the condensing module. These parameters control the condensing module to recover the high-temperature steam discharged from the steam deaerator, adjusting the waste heat recovery efficiency in real time to ensure maximum utilization of thermal energy. Through adaptive dynamic control based on operating conditions, the energy efficiency loss problem of the waste heat recovery device is solved, significantly improving the steam heat recovery rate while reducing the overall energy consumption of waste heat recovery. Specifically, the condensation parameter generation unit performs dynamic adaptive analysis based on predicted values from steam diffusion discharge data, a preset condensation control template, and real-time operating status data fed back from the condensation module. This analysis performs closed-loop correction and optimization of condensation control parameters such as the target opening of the cooling water regulating valve and the target speed of the condensing fan. Specifically, a continuous deviation between the feedback real-time operating status data and the pre-stored values in the preset condensation control template serves as a trigger condition. For example, if the feedback steam condensate temperature exceeds the preset target temperature by ±2℃ for three consecutive sampling cycles, or if the actual cooling water flow rate deviates from the preset flow rate by ±10% for five consecutive seconds, cooling water flow rate correction is triggered. In PID control, the deviation between the feedback steam condensate temperature and the preset target temperature is used as input. After proportional, integral, and derivative calculations, the output is the adjustment amount for the cooling water regulating valve opening, which is then sent to the actuator of the cooling water regulating valve, thereby achieving adaptive and coordinated control of the waste heat recovery process.
[0031] Preferably, the exhaust channel 13 of the steam deoxygenation device 1 is connected to the inlet of the waste heat recovery chamber 21 of the waste heat recovery device 2, forming a high-temperature steam discharge and recovery channel. The steam regulating valve 111 is connected to the steam diffuser 11 to control the steam flow rate into the diffuser. The steam output from the steam regulating valve 111 first enters the primary steam diffusion layer 112, and then enters the secondary steam diffusion layer 113. The spray module 12 is connected to the steam diffuser 11, with its spray head located at the top or upper part of the steam diffuser 11, spraying the deoxygenated water onto the diffusion layer. The exhaust channel 13 is the physical channel between the steam deoxygenation device 1 and the waste heat recovery device 2, connected to the top or exhaust port of the steam diffuser 11, and its outlet is directly connected to the inlet of the waste heat recovery chamber 21 to discharge the high-temperature steam after the deoxygenation process is completed. The waste heat recovery chamber 21 is connected to the condensation module 22. After entering the waste heat recovery chamber 21, the high-temperature steam flows to the condensation module 22 for heat exchange and condensation. The communication connection module 3 and the condensing parameter control module 4 form a communication and control system, which is connected to the steam deoxygenation device 1. The system is used to collect the operating status of the steam diffuser, generate steam diffusion layer tags, and transmit the steam diffusion layer tags and / or data to the condensing parameter control module. The condensing parameter control module 4 is connected to the control terminal of the waste heat recovery device 2 or the actuator of the condensing module 22. The system is used to output condensing control parameters to the condensing module 22 and control the condensing module 22. At the same time, the status data of the condensing module 22 is fed back to the condensing parameter control module 4, forming a closed-loop control circuit.
[0032] Furthermore, an adaptive steam deoxygenation and waste heat recovery coordinated control device further includes a primary steam diffusion layer connected to a steam box at a first height via a steam regulating valve and a steam inlet pipe to form a primary deoxygenation region, and a secondary steam diffusion layer connected to a steam box at a second height via a steam regulating valve and a steam inlet pipe to form a secondary deoxygenation region; wherein the deoxygenation intensity of the primary deoxygenation region is less than that of the secondary deoxygenation region.
[0033] Preferably, the steam diffuser adopts a vertically layered design, forming two-stage deoxygenation zones through steam introduction at different heights: a primary deoxygenation zone and a secondary deoxygenation zone. Specifically, the primary deoxygenation zone, located at the first height of the steam diffuser, is used for initial deoxygenation. Steam flow is controlled by a steam regulating valve 111, and high-temperature steam is introduced from the steam tank through a steam inlet pipe. This zone has a large steam flow rate, high steam pressure, and low deoxygenation intensity, quickly removing approximately 60%–70% of the dissolved oxygen in the water. The secondary deoxygenation zone, located at the second height of the steam diffuser, is used for deep deoxygenation. It is precisely controlled by an independent steam regulating valve and supplied with steam through a dedicated steam inlet pipe. This zone has a smaller steam flow rate, lower steam pressure, and higher deoxygenation intensity, removing the remaining 30%–40% of the dissolved oxygen. This vertical spatial separation achieves gradient optimization of the deoxygenation process. The primary zone rapidly processes large flow rates of water, while the secondary zone performs fine deoxygenation. The two steam regulating valves are independently controlled, allowing for flexible adjustment of the deoxygenation intensity based on the oxygen content of the influent.
[0034] Furthermore, an adaptive steam deoxygenation and waste heat recovery coordinated control device further includes, wherein the deoxygenation intensity includes steam flow rate and steam temperature; wherein, the steam regulating valve is used to regulate the steam flow rate introduced into the primary steam diffusion layer and the secondary steam diffusion layer through the steam inlet pipe, and to regulate the steam temperature introduced into the primary steam diffusion layer and the secondary steam diffusion layer by controlling the temperature of the steam box.
[0035] Preferably, the deoxygenation intensity is adjusted in stages by coordinating the control of steam flow and steam temperature. Specifically, the steam flow rate introduced into each stage of the steam diffusion layer is precisely controlled by the opening of the steam regulating valve. The steam regulating valve uses an electric / pneumatic actuator and receives PLC control signals for regulation. The first-stage steam diffusion layer uses a large flow rate to achieve rapid oxygen removal, while the second-stage steam diffusion layer uses a small flow rate to ensure deep deoxygenation. The steam temperature of the first-stage and second-stage steam diffusion layers is regulated by the temperature control of the steam box. The steam box has multiple sets of electric heaters built in, and the temperature deviation between the first and second stages is maintained by a PID algorithm. In the first-stage steam diffusion layer, high-temperature steam (150~180℃) enhances the kinetic energy of oxygen molecule escape, while in the second-stage steam diffusion layer, medium-temperature steam (120~150℃) maintains chemical equilibrium deoxygenation.
[0036] Furthermore, an adaptive steam deoxygenation and waste heat recovery synergistic control device further includes a first diffuser plate in the primary steam diffusion layer and a second diffuser plate in the secondary steam diffusion layer, wherein the pore size of the first diffuser plate is larger than the pore size of the second diffuser plate.
[0037] Preferably, gradient deoxygenation is achieved through diffuser plates with differentiated pore sizes. The primary steam diffusion layer includes a first diffuser plate, and the secondary steam diffusion layer includes a second diffuser plate. The pore size of the first diffuser plate is larger than that of the second diffuser plate. Specifically, the first diffuser plate is made of stainless steel perforated plate or sintered metal filter screen with an opening ratio ≥40% and a pore size range of 3-5 mm, used to form a large bubble steam flow, primarily breaking down free oxygen molecules in the water. The second diffuser plate is made of precision laser-drilled plate or sintered ceramic body with an opening ratio of 15%-20% and a pore size range of 0.5-1.5 mm, used to generate a microbubble steam flow, primarily removing bound dissolved oxygen. The pore sizes of the two-stage steam diffusion layers improve steam utilization, and the differentiated opening ratios prevent interlayer pressure imbalance.
[0038] Furthermore, an adaptive steam deoxygenation and waste heat recovery coordinated control device further includes, wherein the steam diffusion layer label includes a primary diffusion layer start-up label, a secondary diffusion layer start-up label, and a combined diffusion layer start-up label; wherein the combined diffusion layer start-up label is a label for the step-by-step start-up processing of the primary steam diffusion layer and the secondary steam diffusion layer.
[0039] Preferably, the steam diffusion layer labels include a primary diffusion layer start-up label, a secondary diffusion layer start-up label, and a combined diffusion layer start-up label. Intelligent deoxygenation control is achieved through these three levels of operating condition labels. Specifically, when the detected influent oxygen content is ≤2 mg / L, the primary diffusion layer start-up label is triggered, initiating the primary steam diffusion layer for low-oxygen water treatment. When the required effluent oxygen content is ≤0.02 mg / L, the secondary diffusion layer start-up label is triggered, activating the secondary steam diffusion layer for fine treatment or ultrapure water preparation. The combined diffusion layer start-up label is a label for the sequential activation of the primary and secondary steam diffusion layers. When the influent oxygen content is >5 mg / L and deep deoxygenation is required, the combined diffusion layer start-up label is triggered, controlling the sequential activation of the primary and secondary diffusion layers. Steam parameters are adjusted in stages from high flow rate to high precision, automatically balancing deoxygenation efficiency and energy consumption.
[0040] Furthermore, an adaptive steam deoxygenation and waste heat recovery coordinated control device further includes a condensation parameter control module comprising a hierarchical driving model, which includes a tag parsing unit, a control mode matching unit, and a condensation parameter generation unit. The hierarchical driving model is downloaded to the control terminal of the waste heat recovery device. The tag parsing unit parses the received steam diffusion layer tags to obtain the condensation control mode of the control mode matching unit. Under the condensation control mode, the condensation parameter generation unit performs adaptive analysis and outputs condensation control parameters.
[0041] Preferably, the condensing parameter control module includes a hierarchical driving model, which is the intelligent control core of the waste heat recovery device. The hierarchical driving model includes a tag parsing unit, a control mode matching unit, and a condensing parameter generation unit. Through a three-level processing unit, it achieves precise coordinated control with the steam deoxygenation device. Specifically, the hierarchical driving model is downloaded to the control terminal of the waste heat recovery device. The tag parsing unit parses the received steam diffusion layer tags, identifies the steam diffusion layer operating status corresponding to the first-level diffusion layer start-up tag, the second-level diffusion layer start-up tag, or the combined diffusion layer start-up tag, and extracts key parameters, including the steam flow range and temperature range. The control mode matching unit is used to establish a tag-control strategy mapping relationship, that is, based on the steam flow and temperature output by the tag parsing unit... Key parameters such as predicted values are matched and the corresponding condensing control modes are obtained. Specifically, when the tag is a primary diffusion layer start tag or a secondary diffusion layer start tag, a single-segment condensing control mode is matched and obtained. When the tag is a combined diffusion layer start tag or the rate of change of steam flow rate within a unit time (e.g., 1 minute) exceeds ±15% of its rated value, a multi-segment condensing control mode is matched and obtained. Finally, under the condensing control mode, the condensing parameter generation unit performs adaptive analysis. That is, the condensing parameter generation unit dynamically calculates the condensing temperature difference compensation and heat exchange efficiency correction coefficient based on steam characteristics, and then outputs condensing control parameters, including cooling water flow rate, temperature, and velocity, and updates the condensing control parameters in real time to ensure stable steam waste heat recovery rate while reducing cooling water consumption.
[0042] Furthermore, an adaptive steam deoxygenation and waste heat recovery coordinated control device also includes: parsing and predicting steam diffusion discharge data corresponding to the steam diffusion layer tag by the tag parsing unit, the steam diffusion discharge data including the temperature and flow rate of the discharged steam; reading a preset condensation control template corresponding to the condensation control mode, the preset condensation control template including a preset condensation target temperature, a preset condensate flow rate, and a condensate flow velocity; performing adaptive analysis based on the steam diffusion discharge data and the preset condensation control template, and outputting condensation control parameters.
[0043] Preferably, precise control of waste heat recovery is achieved by dynamically analyzing steam operating data and combining it with a preset control template. Specifically, the tag analysis unit analyzes and predicts the corresponding steam diffusion discharge data based on the steam diffusion layer tags and historical operating database, including the temperature of the discharged steam, such as 160±5℃ for the first-stage diffusion mode and 140±3℃ for the second-stage diffusion mode. Based on the valve opening of the steam regulating valve and the pressure sensor reading inside the deaerator, and combined with the preset valve flow characteristic curve, the steam diffusion discharge data under the corresponding operating condition is analyzed and predicted, including real-time steam flow. For linear characteristic valves, the steam flow is directly proportional to the valve opening within the allowable error range (e.g., ±5%), that is, for every 10% increase in opening, the flow... The corresponding increase is approximately 10%. Then, the preset condensing control template corresponding to the condensing control mode is read. This may include three optimized control templates: rapid condensing template, fine condensing template, and gradient condensing template, which are matched to primary diffusion, secondary diffusion, and combined diffusion, respectively. The preset condensing control template includes a preset target condensing temperature, a preset condensing water flow rate, and a condensing water velocity. Specifically, the rapid condensing template has a target condensing temperature ≤40℃, a cooling water flow rate of 1.2 times the steam flow rate, and a velocity control of 2.5 m / s; the fine condensing template has a target condensing temperature ≤35℃, a cooling water flow rate of 0.8 times the steam flow rate, and a velocity control of 1.8 m / s; and the gradient condensing template dynamically adjusts the target temperature and flow rate proportionally to the steam decay curve. Finally, adaptive analysis is performed based on the steam diffusion data and the preset condensing control template to calculate temperature and flow rate compensation corrections in real time, outputting condensing control parameters, namely temperature, flow rate, and velocity, to ensure condensing efficiency under different operating conditions.
[0044] Furthermore, an adaptive steam deoxygenation and waste heat recovery coordinated control device further includes a tag parsing unit comprising a steam diffusion prediction model. Training the steam diffusion prediction model includes: collecting first steam diffusion control data samples and second steam diffusion control data samples corresponding to the first-stage steam diffusion layer and the second-stage steam diffusion layer, respectively; detecting first steam diffusion discharge data samples and second steam diffusion discharge data samples corresponding to the first steam diffusion control data samples and the second steam diffusion control data samples; fitting the mapping relationships between the first steam diffusion control data samples and the second steam diffusion control data samples and the first steam diffusion discharge data samples and the second steam diffusion discharge data samples, respectively; and training the steam diffusion prediction model based on the mapping relationships. The tag parsing unit acquires the steam diffusion layer tags, obtains the diffusion control data corresponding to the steam diffusion layer tags, and predicts the steam diffusion discharge data corresponding to the diffusion control data based on the steam diffusion prediction model.
[0045] Preferably, the tag parsing unit includes a steam diffusion prediction model. This model is used for accurate prediction and control of deoxygenation conditions. For the first-stage steam diffusion layer, it collects data including the opening degree of the first-stage steam regulating valve, the set / real-time temperature of the steam box, and the steam pressure at the inlet of the first-stage diffusion layer to determine the first steam diffusion control data sample. For the second-stage steam diffusion layer, it collects data including the opening degree of the second-stage steam regulating valve, the set / real-time temperature of the steam box, and the steam pressure at the inlet of the second-stage diffusion layer to determine the second steam diffusion control data sample. Then, through simulation detection, it synchronously collects actual result data corresponding to the first steam diffusion control data sample, measured at the exhaust channel or the inlet of the waste heat recovery chamber. This data mainly includes the actual temperature and actual flow rate of the discharged steam to determine the first steam diffusion discharge data sample. The actual flow rate is measured by a vortex flow meter or orifice plate flow meter installed on the exhaust channel. Similarly, it synchronously collects the second steam diffusion discharge data sample corresponding to the second steam diffusion control data sample.
[0046] Preferably, the collected first steam diffusion control data samples and second steam diffusion control data samples, as well as the first steam diffusion discharge data samples and second steam diffusion discharge data samples, are cleaned to remove outliers caused by momentary sensor failures, and missing values are filled by linear interpolation or the average of the effective values before and after. In addition, sample data covering the main working area of the steam deaerator should be collected, with a total number of training samples of not less than 1,000 sets. The samples should evenly cover the combined working conditions of different influent flow rates, different influent oxygen content, and different steam box temperature setpoints under the primary diffusion mode, secondary diffusion mode, and combined diffusion mode to ensure that the model has sufficient generalization ability.
[0047] Preferably, a random forest regression algorithm is used to fit the mapping relationships between the first steam diffusion control data sample and the first steam diffusion discharge data sample, as well as the second steam diffusion control data sample and the second steam diffusion discharge data sample. This establishes a mapping relationship between control parameters such as the regulating valve opening and steam box temperature, and discharge data such as the discharge steam temperature and flow rate. The random forest consists of multiple decision trees and is trained; specifically, the number of decision trees is set to 100-500. Mean squared error is used as the criterion for splitting decision tree nodes to minimize the variance between the predicted and actual values. All valid sample data are then processed. The data is randomly divided into a training set and an independent test set in a 7:3 or 8:2 ratio. The training set is used to build the training model, and the test set is used to evaluate the model's generalization performance. The maximum depth of the decision tree can be unlimited, allowing it to grow completely, or set to a large value (e.g., 20) to prevent overfitting. Bootstrap sampling is enabled to increase model diversity, and the minimum number of samples required for node splitting is set to 2 or 5. Using the divided training set data, a random forest regression model is trained according to the parameter settings. The training objective is to enable the model to learn the intrinsic relationship between valve opening, temperature, pressure, discharge temperature, and discharge flow rate. The model is then validated using test set data not used in training. Key evaluation metrics include Mean Absolute Error (MAE), the average of the absolute differences between predicted and actual values. The MAE for predicted exhaust steam temperature should be ≤3.0℃, and the MAE for predicted exhaust steam flow rate should be ≤5% of the measured flow rate. The coefficient of determination (COD) reflects the model's ability to explain data variation; a COD ≥0.90 indicates high predictive accuracy. When the model's performance metrics on the test set simultaneously meet the evaluation criteria, it is considered successfully trained, and the parameters are downloaded to the label parsing unit. If the target is not met, it is necessary to check the data quality, increase the number of decision trees, adjust the maximum depth of the trees, or add more representative samples and retrain to finally obtain the steam diffusion prediction model. Then, the label parsing unit receives and obtains the steam diffusion layer labels, reads the diffusion control data corresponding to the steam diffusion layer labels, including the current steam regulating valve opening and the real-time temperature of the steam box, and then inputs the diffusion control data into the corresponding level prediction component of the steam diffusion prediction model to predict and output steam diffusion discharge data, including the discharge steam temperature and discharge steam flow rate. It can also dynamically match the condensation intensity based on the predicted steam diffusion discharge data to avoid energy waste.
[0048] Furthermore, an adaptive steam deoxygenation and waste heat recovery coordinated control device also includes a control mode matching unit comprising a single-stage condensation control mode and a multi-stage condensation control mode.
[0049] Preferably, the control mode matching unit includes two intelligent condensation strategies: a single-stage condensation control mode and a multi-stage condensation control mode. These strategies enable precise heat recovery for different steam conditions. Specifically, the single-stage condensation control mode is suitable for stable conditions when the primary and secondary diffusion layers operate independently. It employs constant parameter control to maintain a fixed condensation intensity. When matched to the primary diffusion mode, a high-flow-rate rapid condensation mode is executed; when matched to the secondary diffusion mode, a low-flow-rate fine condensation mode is executed. The multi-stage condensation control mode is suitable for combined diffusion layer operation or when there are large load fluctuations. It adjusts the condensation process in stages: an initial stage of high-flow-rate impact condensation, a transition stage of proportionally reducing the flow rate according to the steam decay curve, and a steady-state stage switching to a fine-tuning mode. Simultaneously, model predictive control is used to calculate the optimal condensation path in real time, improving waste heat recovery efficiency and energy utilization efficiency while ensuring steam deoxygenation stability.
[0050] While this application makes various references to certain modules in the apparatus according to embodiments of this application, any number of different modules can be used and run on user terminals and / or servers. The various units and modules included are only divided according to functional logic, but are not limited to the above division, as long as the corresponding functions can be achieved; in addition, the specific names of each functional unit are only for easy distinction and are not intended to limit the scope of protection of this invention. The above specific embodiments do not constitute a limitation on the scope of protection of this application. Those skilled in the art should understand that various modifications, combinations, and substitutions can be made according to design requirements and other factors. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this application should be included within the scope of protection of this application.
Claims
1. A synergistic control device for adaptive steam deoxygenation and waste heat recovery, characterized in that, The device includes: A steam deoxygenation device, comprising a steam diffuser and a spray module, wherein the steam diffuser is provided with a primary steam diffusion layer and a secondary steam diffusion layer; A waste heat recovery device, wherein the waste heat recovery chamber of the waste heat recovery device is connected to the exhaust channel of the steam deaerator, and the waste heat recovery device includes a condensation module; The communication connection module establishes a communication connection between the steam deoxygenation device and the waste heat recovery device, and collects the steam diffusion layer tags used by the steam diffuser to perform steam deoxygenation treatment on the inlet water of the spray module. The condensation parameter control module transmits the steam diffusion layer tag to the control terminal of the waste heat recovery device, performs adaptive analysis on the condensation control parameters based on the steam diffusion layer tag, outputs the condensation control parameters, and controls the condensation module to recover the high-temperature steam discharged from the steam deoxygenation device based on the condensation control parameters. The vapor diffusion layer label includes a primary diffusion layer start-up label, a secondary diffusion layer start-up label, and a combined diffusion layer start-up label. The combined diffusion layer start-up label is a label for the step-by-step start-up process of the primary vapor diffusion layer and the secondary vapor diffusion layer. The condensation parameter control module includes a hierarchical driving model, which includes a tag parsing unit, a control mode matching unit, and a condensation parameter generation unit. The hierarchical driving model is downloaded to the control terminal of the waste heat recovery device. The tag parsing unit parses the received steam diffusion layer tag to obtain the condensation control mode of the control mode matching unit. In the condensation control mode, the condensation parameter generation unit performs adaptive analysis and outputs condensation control parameters. The condensation parameter control module further includes: The tag parsing unit parses and predicts the steam diffusion discharge data corresponding to the steam diffusion layer tag, the steam diffusion discharge data including the temperature and flow rate of the discharged steam; Read the preset condensation control template corresponding to the condensation control mode. The preset condensation control template includes a preset condensation target temperature, a preset condensate flow rate, and a condensate flow velocity. Based on the steam diffusion discharge data and the preset condensation control template, adaptive analysis is performed to output condensation control parameters.
2. The adaptive steam deoxygenation and waste heat recovery synergistic control device as described in claim 1, characterized in that, The primary steam diffusion layer is connected to the steam box at the first height through a steam regulating valve and a steam inlet pipe to form a primary deoxygenation zone, and the secondary steam diffusion layer is connected to the steam box at the second height through a steam regulating valve and a steam inlet pipe to form a secondary deoxygenation zone. The deoxygenation intensity of the primary deoxygenation region is less than that of the secondary deoxygenation region.
3. The adaptive steam deoxygenation and waste heat recovery synergistic control device as described in claim 2, characterized in that, The deoxidation intensity includes steam flow rate and steam temperature; The steam regulating valve is used to regulate the steam flow rate introduced into the primary steam diffusion layer and the secondary steam diffusion layer through the steam inlet pipe, and to regulate the steam temperature introduced into the primary steam diffusion layer and the secondary steam diffusion layer by controlling the temperature of the steam box.
4. The adaptive steam deoxygenation and waste heat recovery synergistic control device as described in claim 2, characterized in that, The primary vapor diffusion layer further includes a first diffusion plate, and the secondary vapor diffusion layer further includes a second diffusion plate, wherein the pore size of the first diffusion plate is larger than the pore size of the second diffusion plate.
5. The adaptive steam deoxygenation and waste heat recovery synergistic control device as described in claim 1, characterized in that, The label parsing unit includes a vapor diffusion prediction model, and training the vapor diffusion prediction model includes: Collect first steam diffusion control data samples and second steam diffusion control data samples corresponding to the first-stage steam diffusion layer and the second-stage steam diffusion layer, respectively; Detect the first steam diffusion discharge data sample and the second steam diffusion discharge data sample corresponding to the first steam diffusion control data sample and the second steam diffusion control data sample; The steam diffusion prediction model is trained based on the mapping relationship between the first steam diffusion control data sample and the second steam diffusion control data sample and the first steam diffusion discharge data sample and the second steam diffusion discharge data sample, respectively. The tag parsing unit obtains the vapor diffusion layer tag, gets the diffusion control data corresponding to the vapor diffusion layer tag, and predicts the vapor diffusion discharge data corresponding to the diffusion control data based on the vapor diffusion prediction model.
6. The adaptive steam deoxygenation and waste heat recovery synergistic control device as described in claim 1, characterized in that, The control mode matching unit includes a single-stage condensation control mode and a multi-stage condensation control mode.