Redundant submerged arc furnace multi-source waste heat heating method and system based on intelligent management

Abstract

The invention provides a redundant submerged arc furnace multi-source waste heat heating method and system based on intelligent management, and relates to the technical field of industrial waste heat heating control. According to the method, an operation data set is constructed by collecting the operation states of main steam, circulating cooling water, a heating pipe network and a pump set of a submerged arc furnace waste heat boiler, the multi-source waste heat available heat supply capacity is evaluated, the heat use requirement of a user and the target water supply temperature are determined, and a composite heat supply mode, a single heat source redundancy mode or a cascade quality-divided heat supply mode is selected in combination with the equipment health state; cooperative control and main-standby switching are carried out on the valve and the pump set, closed-loop correction is carried out based on temperature difference and pressure difference feedback, and stable, efficient and continuous utilization of the multi-source waste heat of the submerged arc furnace in a heating scene is achieved.

Description

Technical Field

[0001] This invention relates to the field of industrial waste heat heating control technology, and in particular to a method and system for multi-source waste heat heating of redundant submerged arc furnaces based on intelligent management. Background Technology

[0002] Submerged arc furnaces are widely used in ferroalloy smelting and other applications. The production process generates high-temperature flue gas sensible heat and equipment cooling heat, creating multi-grade waste heat resources. Current research and engineering practice show that waste heat from submerged arc furnace flue gas is often recovered for power generation or heating through waste heat boilers. However, the low-grade heat discharged from the cooling system is more difficult to utilize due to fluctuations in temperature grade and operating conditions, resulting in a considerable amount of waste heat remaining unconverted within the plant. When this waste heat is not utilized in a cascade manner, it often manifests as both energy loss and waste heat emissions.

[0003] Against the backdrop of pollution reduction, carbon reduction, and clean heating, the use of industrial low-grade waste heat for centralized heating in towns or industrial parks has become an important technological direction. Relevant technical guidelines have put forward general requirements for the selection of schemes, waste heat resource evaluation, system design, and operation management of centralized heating using industrial low-grade waste heat. Meanwhile, research has also pointed out that in engineering practice, centralized heating using low-grade waste heat needs to solve key issues such as efficient waste heat collection and integration, matching of heat network transmission and distribution, hydraulic and thermal regulation, and operational stability and safety boundaries in order to achieve coordinated optimization between the heat source side and the user side.

[0004] However, waste heat from submerged arc furnaces is characterized by diverse sources, significant grade differences, load fluctuations with smelting cycles, and intermittent heat source disruptions due to maintenance shutdowns. If the heating system relies on only a single heat source or a single path, it is prone to single-point failures, leading to heating interruptions and operational instability. On the other hand, the main heating pipeline needs to meet the continuous requirements of user areas for water supply temperature and network pressure, and heat exchange and pump / valve regulation require real-time monitoring and closed-loop control capabilities. Existing research on heating exchange station control indicates that coordinated monitoring of key points in the heating network and station-end control are crucial for ensuring stable heating and energy-efficient operation. Therefore, a multi-source waste heat coordination and redundancy solution for submerged arc furnace scenarios is needed. This solution should utilize intelligent management to achieve operating mode switching and fault isolation, maintaining continuous heating even during heat source fluctuations or equipment malfunctions. Summary of the Invention

[0005] In order to overcome the shortcomings of the existing technology, the purpose of this invention is to provide a method and system for multi-source waste heat heating of redundant electric arc furnaces based on intelligent management. Through the coordinated management of the multi-source waste heat heating capacity, operation mode and execution object of the electric arc furnace, the stable, efficient and continuous utilization of multi-source waste heat in the heating scenario is realized.

[0006] To achieve the above objectives, the present invention provides the following solution: A method for multi-source waste heat heating in a redundant submerged arc furnace based on intelligent management includes: The system collects the temperature and pressure of the main steam pipe and water supply pipe of the waste heat boiler in the smelting workshop, the temperature and flow rate of the circulating cooling water supply and return water, the temperature of the main heating pipe and the heating return water pipe, the return water temperature of the user area, and the operating status of the circulating water pump, heating pump, condensate pump and booster pump to form an operating dataset. Based on the operational dataset, assess the available heating capacity of the circulating cooling water and the main steam, and determine the heating demand of the user area and the target supply water temperature of the main heating pipeline; Based on the available heating capacity and the equipment health status represented by the operation dataset, a composite heating mode, a single heat source redundant heating mode, or a tiered differentiated heating mode is selected as the target mode, and a set of controllable execution objects corresponding to the target mode is determined; the set of controllable execution objects includes valves connected to the plate heat exchanger, valves connected to the condensate tank, pressure regulating valves, temperature regulating valves, heating pumps, condensate pumps, circulating water pumps, and booster pumps; For the target mode, the opening and closing states of the valves connected to the plate heat exchanger and the valves connected to the condensate tank are controlled, and the pressure regulating valve and the temperature regulating valve are adjusted so that the main heating pipeline outputs hot water that meets the target water supply temperature, and the condensate generated by the heat exchange of the plate heat exchanger is collected into the condensate tank and transported to the waste heat power generation deaerator by the condensate pump. The heating pump, the condensate pump, the circulating water pump and the booster pump are subject to main / standby switching and abnormal isolation control. When the health status of the equipment meets the preset abnormality criteria, the standby equipment is started and the heating main pipeline is kept continuously heated. Using the temperature and pressure difference between the main heating pipe and the return heating pipe as feedback, the opening degree of the pressure regulating valve, the opening degree of the temperature regulating valve, and the operating parameters of the heating pump are corrected in a closed loop. The corrected pump and valve operating parameters are recorded, and in the next control cycle, the corrected pump and valve operating parameters are used as the input for the target mode selection and pump and valve control parameter update.

[0007] Preferably, the system collects the temperature and pressure of the main steam pipe and water supply pipe of the waste heat boiler in the smelting workshop, the temperature and flow rate of the circulating cooling water supply and return water, the temperature of the main heating pipe and heating return water pipe, and the return water temperature of the user area, as well as the operating status of the circulating water pump, heating pump, condensate pump, and booster pump, to form an operating dataset, including: The temperature and pressure of the main steam pipe and the temperature and pressure of the water supply pipe are collected within a preset collection period. The temperature and flow rate of the circulating cooling water supply and the temperature and flow rate of the circulating cooling water return are collected within the preset collection period. The temperature of the main heating pipe, the temperature of the heating return pipe, and the return water temperature of the user area are collected within the preset collection period. The operating status of the circulating water pump, the heating pump, the condensate pump and the booster pump is collected within the preset collection period; The operating dataset is formed by compiling the temperature and pressure of the main steam pipe and the water supply pipe, the temperature and flow rate of the circulating cooling water supply and the circulating cooling water return, the temperature of the main heating pipe and the heating return pipe, the return water temperature of the user area, and the operating status of the circulating water pump, the heating pump, the condensate pump and the booster pump.

[0008] Preferably, evaluating the available heating capacity of the circulating cooling water and the main steam based on the operational dataset includes: Based on the circulating cooling water supply temperature, circulating cooling water return temperature, and circulating cooling water return flow rate in the running dataset, the available heating capacity of the circulating cooling water is calculated. Based on the temperature and pressure of the main steam pipe in the running dataset, the thermal parameters of the main steam are determined from the preset steam thermal parameter table, and the available heating capacity of the main steam is calculated by combining the temperature of the heating return water pipe. The available heating capacity of the circulating cooling water and the available heating capacity of the main steam are used as the input for selecting the target mode.

[0009] Preferably, determining the heat demand of the user area and the target water supply temperature of the main heating pipeline includes: Based on the temperature of the main heating pipe and the temperature of the return heating pipe in the running dataset, the temperature difference between the main heating pipe and the return heating pipe is calculated, and the heating demand of the user area is determined according to the temperature difference. Based on the return water temperature of the user area in the running dataset and the preset heating demand determination threshold, the heating demand of the user area is corrected. The target water supply temperature of the main heating pipeline is determined based on the revised heating demand of the user area, and the target water supply temperature of the main heating pipeline is used as the target value for adjusting the temperature regulating valve.

[0010] Preferably, based on the available heating capacity and the equipment health status represented by the operational dataset, a composite heating mode, a single heat source redundant heating mode, or a tiered differentiated heating mode is selected as the target mode, including: When the available heating capacity of the circulating cooling water meets the heating demand of the user area and the health status of the equipment meets the preset normal criteria, the single heat source redundant heating mode is selected, and the circulating cooling water is identified as the target heat source. When the available heating capacity of the main steam meets the heating demand of the user area and the health status of the equipment meets the preset normal criteria, the single heat source redundant heating mode is selected and the main steam is identified as the target heat source. When both the available heating capacity of the circulating cooling water and the available heating capacity of the main steam are available and the health status of the equipment meets the preset normal criteria, the composite heating mode is selected. When the available heating capacity of the circulating cooling water is insufficient to meet the heating demand of the user area and the main steam is available, the tiered heating mode is selected.

[0011] Preferably, for the target mode, controlling the opening and closing states of the valves connected to the plate heat exchanger and the valves connected to the condensate tank includes: In the single heat source redundant heating mode, the target heat source branch valve in the valve connected to the plate heat exchanger is opened, and the non-target heat source branch valve in the valve connected to the plate heat exchanger is closed. In the combined heating mode, the circulating cooling water branch valve and the main steam branch valve in the valve connected to the plate heat exchanger are opened, and the valve connected to the condensate tank is opened to connect the condensate recovery path. In the tiered heating mode, the circulating cooling water branch valve in the valve connected to the plate heat exchanger is opened to preheat the heating return water pipeline. When the temperature of the main heating pipeline is lower than the target supply water temperature of the main heating pipeline, the main steam branch valve in the valve connected to the plate heat exchanger is opened to supplement the heating return water pipeline, while the valve connected to the condensate tank is kept open.

[0012] Preferably, the condensate generated by the plate heat exchanger is collected in the condensate tank and then pumped by the condensate pump to the waste heat power generation deaerator, comprising: The condensate generated by the plate heat exchanger is channeled into the condensate tank via the valve connected to the condensate tank. The condensate pump is controlled to transport the condensate in the condensate tank to the waste heat power generation deaerator; During the condensate pumping process, the valve connected to the condensate tank is kept open to maintain the continuity of condensate delivery.

[0013] Preferably, the heating pump, the condensate pump, the circulating water pump, and the booster pump are subject to main / standby switching and abnormal isolation control. When the health status of the equipment meets the preset abnormality criteria, the standby equipment is activated and the main heating pipeline is kept continuously supplied with heat, including: The preset anomaly criterion is set as follows: the operating state represented by the operating dataset satisfies any of the following conditions: shutdown failure, overload alarm, or communication anomaly; or the temperature of the main heating pipe deviates from the target water supply temperature of the main heating pipe by more than a preset temperature deviation threshold; or the pressure difference between the main heating pipe and the return water pipe deviates from a preset pressure difference threshold. When the health status of the circulating water pump meets the preset abnormality criterion, the corresponding circulating water pump is isolated and the standby circulating water pump is started. When the health status of the heating pump meets the preset abnormality criterion, the corresponding heating pump is isolated and the standby heating pump is started. When the health status of the condensate pump meets the preset abnormality criterion, the corresponding condensate pump is isolated and the standby condensate pump is started. When the health status of the booster pump meets the preset abnormality criterion, the corresponding booster pump is isolated and the standby booster pump is started.

[0014] Preferably, the temperature and pressure differences between the main heating pipe and the return heating pipe are used as feedback to correct the opening of the pressure regulating valve, the opening of the temperature regulating valve, and the operating parameters of the heating pump in a closed loop. The corrected pump and valve operating parameters are recorded, and in the next control cycle, these corrected parameters are used as input for the target mode selection and pump and valve control parameter update. The temperature difference and pressure difference between the main heating pipe and the return heating pipe are calculated based on the running dataset, and the temperature difference is compared with a preset temperature difference target range, and the pressure difference is compared with a preset pressure difference target range. When the temperature difference exceeds the preset temperature difference target range, the opening of the temperature regulating valve is adjusted and the operating parameters of the heating pump are adjusted simultaneously so that the temperature difference returns to the preset temperature difference target range. When the pressure difference exceeds the preset pressure difference target range, the opening of the pressure regulating valve is adjusted and the operating parameters of the heating pump are adjusted simultaneously to bring the pressure difference back to the preset pressure difference target range. Record the pump and valve operating parameters after the closed-loop correction, and update the input of the target mode selection and the pump and valve control parameter update based on the closed-loop corrected pump and valve operating parameters in the next control cycle.

[0015] A redundant submerged arc furnace multi-source waste heat heating system based on intelligent management includes: The operation data acquisition unit is used to collect the temperature and pressure of the main steam pipe and water supply pipe of the waste heat boiler of the smelting workshop's electric arc furnace, the temperature and flow rate of the circulating cooling water supply and return water, the temperature of the main heating pipe and the heating return water pipe, the return water temperature of the user area, and the operating status of the circulating water pump, heating pump, condensate pump and booster pump, forming an operation dataset. The heating capacity assessment and demand determination unit is used to assess the available heating capacity of the circulating cooling water and the main steam based on the operating dataset, and to determine the heating demand of the user area and the target supply water temperature of the main heating pipeline. The heating mode selection unit is used to select a composite heating mode, a single heat source redundant heating mode, or a tiered differentiated heating mode as the target mode based on the available heating capacity and the equipment health status represented by the operation dataset, and to determine the set of controllable execution objects corresponding to the target mode; the set of controllable execution objects includes valves connected to the plate heat exchanger, valves connected to the condensate tank, pressure regulating valves, temperature regulating valves, heating pumps, condensate pumps, circulating water pumps, and booster pumps; The heat exchange and valve coordination control unit is used to control the opening and closing status of the valves connected to the plate heat exchanger and the valves connected to the condensate tank for the target mode, adjust the pressure regulating valve and the temperature regulating valve so that the heating main pipeline outputs hot water that meets the target water supply temperature, and collect the condensate generated by the heat exchange of the plate heat exchanger into the condensate tank and transport it to the waste heat power generation deaerator by the condensate pump. The pump set redundancy switching and abnormal isolation unit is used to perform main standby switching and abnormal isolation control on the heating pump, the condensate pump, the circulating water pump and the booster pump. When the health status of the equipment meets the preset abnormality criteria, the standby equipment is started and the heating main pipeline is kept continuously heated. The heating operation closed-loop regulation and parameter update unit is used to use the temperature difference and pressure difference between the heating main pipe and the heating return water pipe as feedback to correct the opening degree of the pressure regulating valve, the opening degree of the temperature regulating valve, and the operating parameters of the heating pump in a closed loop, and record the pump and valve operating parameters after the closed-loop correction. In the next control cycle, the pump and valve operating parameters after the closed-loop correction are used as the input for the target mode selection and pump and valve control parameter update.

[0016] The present invention discloses the following technical effects: This invention addresses the problems of fragmented utilization of multi-source waste heat, isolated heat source information, and difficulty in forming a holistic heating assessment in existing technologies by uniformly collecting and evaluating the operating status of the main steam circuit and circulating cooling water circuit of a submerged arc furnace waste heat boiler. The operational dataset constructed in this invention incorporates main steam parameters, circulating cooling water parameters, heating network parameters, and pump unit operating status into a single evaluation framework. This allows heating decisions to move beyond reliance on a single heat source or experience-based settings, instead basing judgments on the overall operating status, thereby improving the overall coordination of multi-source waste heat utilization.

[0017] This invention evaluates the available heating capacity of circulating cooling water and main steam based on the aforementioned operational dataset, and determines the heating demand of user areas and the target supply water temperature of the main heating pipeline accordingly. This effectively overcomes the problem of the disconnect between heating capacity and user demand in existing low-grade waste heat heating systems. By introducing a correlation determination mechanism between "available heating capacity" and "target supply water temperature" at the methodological level, the heating output is matched with the actual available capacity on the heat source side, avoiding heating temperature instability or energy waste caused by heat source fluctuations.

[0018] This invention addresses the problems of existing technologies, such as a single heating operation mode, lack of switching logic, and difficulty in adapting to changes in the operating conditions of submerged arc furnaces, by explicitly selecting a composite heating mode, a single heat source redundant heating mode, or a tiered differentiated heating mode as the target mode. This method does not rely on manual switching or fixed operating modes; instead, it selects the mode based on heat source availability and equipment health status, enabling the heating system to maintain adaptive operation under different production cycles and heat source conditions.

[0019] After determining the target mode, this invention achieves stable regulation of the heat exchange process in the heating circuit and completes the orderly recovery and transportation of condensate by coordinating the control of valves connected to the plate heat exchanger and condensate tank, as well as pressure regulating valves and temperature regulating valves. Compared with existing schemes that only focus on heat exchange efficiency while neglecting the continuity of recovery, this method realizes the coordinated operation of heating heat exchange and condensate circuits, which is beneficial to ensuring the safety and continuity of the steam waste heat utilization process.

[0020] This invention solves the problem of heating interruptions caused by single-point failures in existing waste heat heating systems by implementing master / standby switching and anomaly isolation control for heating pumps, condensate pumps, circulating water pumps, and booster pumps, and by using the temperature and pressure differences between the main heating pipeline and the heating return pipeline as feedback for closed-loop correction. This method achieves adaptive correction of the heating operation state without introducing a complex control model, enabling the heating system to maintain continuous heating even when equipment malfunctions or operating conditions fluctuate, significantly improving operational reliability. Attached Figure Description

[0021] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0022] Figure 1 A flowchart of the method provided in an embodiment of the present invention; Figure 2 This is a schematic diagram of the pipeline of a multi-source waste heat heating structure provided in an embodiment of the present invention; Figure 3 This is a schematic diagram of the system structure provided in an embodiment of the present invention. Detailed Implementation

[0023] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0024] The purpose of this invention is to provide a method and system for multi-source waste heat heating of a redundant submerged arc furnace based on intelligent management. This system can maintain stable output of the main heating pipeline even under conditions of heat source fluctuations and equipment malfunctions, effectively improving the reliability and adaptability of the submerged arc furnace waste heat heating system.

[0025] To make the above-mentioned objects, features and advantages of the present invention more apparent and understandable, the present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0026] Figure 1 The method flowchart provided in the embodiments of the present invention is as follows: Figure 1 As shown, this invention provides a method for multi-source waste heat heating of redundant submerged arc furnaces based on intelligent management, comprising: Step 100: Collect the temperature and pressure of the main steam pipe and water supply pipe of the waste heat boiler of the smelting workshop's electric arc furnace, collect the temperature and flow rate of the circulating cooling water supply and return water, collect the temperature of the main heating pipe and the heating return water pipe and collect the return water temperature of the user area, and collect the operating status of the circulating water pump, heating pump, condensate pump and booster pump to form an operating dataset. Step 200: Evaluate the available heating capacity of circulating cooling water and main steam based on the operational dataset, and determine the heating demand of the user area and the target supply water temperature of the main heating pipeline; Step 300: Based on the available heating capacity and the equipment health status represented by the operation dataset, select the composite heating mode, the single heat source redundant heating mode, or the cascade differentiated heating mode as the target mode, and determine the set of controllable execution objects corresponding to the target mode; the set of controllable execution objects includes valves connected to the plate heat exchanger, valves connected to the condensate tank, pressure regulating valves, temperature regulating valves, heating pumps, condensate pumps, circulating water pumps, and booster pumps; Step 400: For the target mode, control the opening and closing status of the valves connected to the plate heat exchanger and the valves connected to the condensate tank, adjust the pressure regulating valve and the temperature regulating valve so that the main heating pipeline outputs hot water that meets the target supply temperature, and collect the condensate generated by the heat exchange of the plate heat exchanger into the condensate tank and transport it to the waste heat power generation deaerator by the condensate pump. Step 500: Perform main / standby switching and abnormal isolation control on the heating pump, condensate pump, circulating water pump and booster pump. When the health status of the equipment meets the preset abnormality criteria, start the standby equipment and maintain continuous heating in the main heating pipeline. Step 600: Using the temperature difference and pressure difference between the main heating pipe and the heating return pipe as feedback, the opening degree of the pressure regulating valve, the opening degree of the temperature regulating valve, and the operating parameters of the heating pump are corrected in a closed loop. The corrected pump and valve operating parameters are recorded, and in the next control cycle, the corrected pump and valve operating parameters are used as the input for target mode selection and pump and valve control parameter update.

[0027] Figure 2 This is a schematic diagram of the pipeline of a multi-source waste heat heating structure provided in an embodiment of the present invention. The multi-source waste heat heating structure of the present invention includes a cooling tower, a circulating water tank, a circulating water pump, a plate heat exchanger, a heating pump, a main heating pipeline, a heating return water pipeline, a user area, a condensate tank, a condensate pump, a waste heat power generation deaerator, a waste heat boiler, a main steam pipe, a water supply pipeline, a pressure regulating valve, a temperature regulating valve, and a booster pump. Circulating cooling water is pumped from the circulating water tank to the plate heat exchanger by the circulating water pump for heat exchange, forming circulating cooling water return water that returns to the circulating water tank. The other side of the plate heat exchanger is connected to the heating return water pipeline. The hot water after heat exchange enters the main heating pipeline under the action of the heating pump and is transported to the user area. The return water from the user area returns to the plate heat exchanger via the heating return water pipeline. The main steam generated by the waste heat boiler enters the plate heat exchanger through the main steam pipe to release heat. The condensate formed after heat release flows into the condensate tank and is then pumped by the condensate pump to the waste heat power generation deaerator before returning to the waste heat boiler through the water supply pipeline. The pressure regulating valve, the temperature regulating valve, and the booster pump are installed in the heating circuit and the steam circuit to regulate the heating pressure, heating temperature, and system operating status, thereby achieving stable heating from multiple waste heat sources.

[0028] In one specific embodiment of the present invention, based on Figure 2 The system structure shown first collects the temperature and pressure of the main steam pipe and the water supply pipe, the temperature and flow rate of the circulating cooling water supply and return water, the temperature of the heating main pipe and the heating return water pipe, and the return water temperature of the user area. It also collects the operating status of the circulating water pump, the heating pump, the condensate pump, and the booster pump to form an operating dataset. Based on the operating dataset, it evaluates the available heating capacity of the circulating cooling water and the main steam, and determines the heating demand of the user area and the target supply water temperature of the heating main pipe. Further, based on the available heating capacity and equipment health status, it selects a composite heating mode, a single heat source redundant heating mode, or a tiered differentiated heating mode as the target mode, and determines the set of controllable execution objects corresponding to the target mode. Then, for the target mode, it performs... Figure 2 The valves connected to the plate heat exchanger, the valves connected to the condensate tank, the pressure regulating valve, and the temperature regulating valve are regulated and controlled to ensure that the main heating pipeline outputs hot water that meets the target supply temperature. At the same time, the condensate generated by the heat exchange is systematically recovered and transported to the waste heat power generation deaerator. When an equipment abnormality is detected, the main standby switch and abnormal isolation control are performed on the heating pump, the condensate pump, the circulating water pump, and the booster pump to maintain continuous heating in the main heating pipeline. Stable operation of the multi-source waste heat heating process is achieved through feedback closed-loop correction of the temperature difference and pressure difference in the heating circuit.

[0029] In this embodiment, when executing step 100, the operating status information of the heating system is first organized into an operating dataset. The operating dataset refers to a set of data obtained in groups within the same preset acquisition period, representing the temperature and pressure or flow parameters of the main steam pipe, water supply pipe, circulating cooling water supply, circulating cooling water return, main heating pipe, heating return pipe, and return water in the user area. This dataset characterizes the heating capacity on the heat source side, the heat distribution status on the pipe network side, and the operating status of key execution objects within the current control period. Specifically, this embodiment sets the preset acquisition period to 10 to 60 seconds. Within one preset acquisition period, at least one acquisition of the main steam pipe temperature and pressure, the water supply pipe temperature and pressure, and at least one acquisition of the circulating cooling water supply temperature, circulating cooling water supply flow rate, circulating cooling water return temperature, and circulating cooling water return flow rate is completed. Simultaneously, at least one acquisition of the heating main pipe temperature, heating return pipe temperature, and user area return water temperature is completed. To avoid biases in heating capacity assessment caused by incomparable data, this embodiment limits the parameters acquired above to a set of data within the same preset acquisition period, and uses this set of data as a periodic sample in the operational dataset. The temperature range can be limited to 20 to 180, the pressure range to 0.1 to 0.5, and the flow rate range to 5 to 800. When any value exceeds the above range, this embodiment marks the value as an outlier and reacquires it within the preset acquisition period to ensure that the operational dataset can truly reflect the availability status of the steam side and circulating cooling water side of the waste heat boiler in the submerged arc furnace, and can form a one-to-one input relationship with the assessment of available heating capacity in subsequent steps.

[0030] After acquiring the thermal parameters, this embodiment further acquires the operating status of the circulating water pump, heating pump, condensate pump, and booster pump within the preset acquisition period, and synchronously aggregates the operating status with the thermal parameters to form the operating dataset. The operating status refers to a set of state variables that can reflect the current operational availability of the corresponding pump set, including at least an operating identifier, operating frequency, and outlet pressure. The operating identifier is used to characterize whether the pump set is in a start-up or stop state, the operating frequency is used to characterize the output capacity of the pump set, and the outlet pressure is used to characterize the driving capacity of the pump set for the main heating pipeline or related pipelines. For example, when the operating identifier is start-up, the operating frequency is between 25 and 50, and the outlet pressure is between 0.3 and 0.5, this embodiment determines that the pump set is in an available state. To ensure that the operational dataset can be directly used for equipment health status determination in subsequent steps, this embodiment further divides the pump group's operating status into normal and abnormal states. The abnormal state includes at least the following situations: the operation is marked as stopped and there is no response to the start command; the outlet pressure is below 0.1; or the operating frequency is above 50 but the outlet pressure cannot be maintained. When the abnormal state occurs, this embodiment records the corresponding abnormal state entry for the pump group in the operational dataset and associates and stores the abnormal state entry with the heating main pipeline temperature and heating return water pipeline temperature within the same preset acquisition period. This ensures that the operational dataset contains both thermal parameters from the heat source side and the pipeline network side, as well as availability information of key pump groups, which can fully support the assessment of available heating capacity in step 200 and the characterization of equipment health status and target mode selection in step 300.

[0031] Optionally, in this embodiment, when performing step 200, the available heating capacity of the circulating cooling water is first evaluated based on the operational dataset. The available heating capacity of the circulating cooling water refers to the level of heat transfer that the circulating cooling water loop can stably provide to the plate heat exchanger within the acquisition period corresponding to the current operational dataset, characterizing the immediate upper limit of heating capacity when the circulating cooling water is used as a heating source. Specifically, this embodiment reads the circulating cooling water supply temperature, circulating cooling water return temperature, and circulating cooling water return flow rate from the operational dataset. The difference between the circulating cooling water supply temperature and the circulating cooling water return temperature is used as the circulating cooling water side temperature difference index, and the circulating cooling water return flow rate is used as the circulating cooling water side delivery capacity index. The temperature difference index and the delivery capacity index are combined and converted to obtain the available heating capacity of the circulating cooling water. To ensure the comparability of the available heating capacity, this embodiment sets an effective flow threshold for the return flow of circulating cooling water, which can be between 20 and 80. When the return flow of circulating cooling water is lower than the effective flow threshold, this embodiment marks the available heating capacity of the circulating cooling water as unavailable or limited, and reduces the priority of the circulating cooling water in the subsequent target mode selection. At the same time, this embodiment sets an effective temperature difference threshold for the circulating cooling water side temperature difference index, which can be between 3 and 8. When the circulating cooling water side temperature difference index is lower than the effective temperature difference threshold, this embodiment determines that the heating contribution of the circulating cooling water is insufficient to be used as a separate heat source, thereby providing a quantitative basis for the subsequent determination of composite heating mode or tiered differentiated heating mode.

[0032] This embodiment further evaluates the available heating capacity of the main steam based on the operational dataset. The available heating capacity of the main steam refers to the level of heat transfer that the main steam can provide when it releases heat to the heating return water pipe via the plate heat exchanger during the current acquisition period. This level characterizes the immediate upper limit of the heating circuit supplied by the waste heat boiler steam side. Specifically, this embodiment reads the temperature and pressure of the main steam pipe from the operational dataset and calls a preset steam thermodynamic parameter table to determine the thermodynamic parameters of the main steam. The preset steam thermodynamic parameter table is a parameter table that maps steam temperature and steam pressure to steam enthalpy and saturation state identifiers. The source of this parameter table can be nationally published steam thermodynamic property data or industry-standard thermal datasets, and in this embodiment, it is stored in discrete table form and indexed by temperature and pressure ranges. To ensure mapping accuracy, this embodiment divides the steam temperature range into intervals of 5 to 10 and the steam pressure range into intervals of 0.05 to 0.2. For example, when the main steam pipe temperature is between 160 and 180°C and the main steam pipe pressure is between 0.8 and 1.2°C, this embodiment retrieves the corresponding steam enthalpy value entry and saturation state identifier entry from the preset steam thermodynamic parameter table, and determines the unit heat exchange that can be released on the steam side in combination with the temperature of the heating return water pipe. Then, it calculates the available heating capacity of the main steam together with the available state of the steam side. When the main steam pipe pressure is below 0.3°C or the main steam pipe temperature is below 120°C, this embodiment marks the available heating capacity of the main steam as limited, and restricts the determination condition of using the main steam as a single heat source in the subsequent target mode selection.

[0033] After assessing the available heating capacity of the circulating cooling water and main steam, this embodiment determines the heating demand of the user area based on the operational dataset. The heating demand of the user area refers to the net heat supply level of the heating circuit required to achieve a preset heating comfort level within the current data collection period, serving as a target for matching heating capacity and output. Specifically, this embodiment reads the temperature of the main heating pipe and the temperature of the return heating pipe from the operational dataset and calculates the temperature difference between them, using this temperature difference as a load characterization of the heating circuit. When the temperature difference is between 5 and 10, this embodiment determines that the user area is in the normal heating range and maps the temperature difference to a basic heating demand level. When the temperature difference is below 5, this embodiment determines that the user area has insufficient heating or ineffective heat distribution, and upgrades the user area's heating demand to a higher level. When the temperature difference is above 10, this embodiment determines that the heating circuit has an overheating risk or that the temperature difference is abnormal due to insufficient flow, and corrects the user area's heating demand to a medium level and triggers constraints on the heating pump's operating parameters. To further avoid misjudgments caused by relying solely on temperature difference, this embodiment introduces the return water temperature of the user area as a correction basis and sets a preset heating demand judgment threshold, which can be between 40 and 55. When the return water temperature of the user area is lower than the preset heating demand judgment threshold, this embodiment increases the heating demand of the user area by one level from the basic heating demand level. When the return water temperature of the user area is higher than the preset heating demand judgment threshold, this embodiment keeps the heating demand of the user area unchanged from the basic heating demand level or decreases it by one level, so that the heating demand of the user area simultaneously reflects two types of quantitative information: the temperature difference of the heating circuit and the return water temperature of the user area.

[0034] This embodiment, after determining the corrected heating demand of the user area, further determines the target water supply temperature of the main heating pipeline and uses this target water supply temperature as the target value for adjusting the temperature regulating valve. The target water supply temperature of the main heating pipeline refers to the target output temperature of the main heating pipeline set within the current data acquisition cycle or the next control cycle to meet the corrected heating demand of the user area, providing a benchmark for adjusting the opening of the temperature regulating valve. Specifically, this embodiment divides the corrected heating demand of the user area into at least three demand levels and sets target water supply temperature ranges for each demand level. The target water supply temperature range for the low demand level can be 45 to 55, the target water supply temperature range for the medium demand level can be 55 to 65, and the target water supply temperature range for the high demand level can be 65 to 75. This embodiment selects the corresponding target water supply temperature range based on the demand level to which the corrected heating demand of the user area belongs, and determines the target water supply temperature of the main heating pipeline within the target water supply temperature range in conjunction with the current temperature of the main heating pipeline. For example, when the heating demand of the user area is at the high demand level and the current temperature of the main heating pipe is 60°C, this embodiment sets the target water supply temperature of the main heating pipe to 70°C and determines the target opening adjustment direction of the temperature regulating valve accordingly. When the current temperature of the main heating pipe is already within the target water supply temperature range, this embodiment sets the target water supply temperature of the main heating pipe to the median value of the target water supply temperature range to suppress temperature fluctuations. This ensures that the adjustment target of the temperature regulating valve has a clear source, a clear value range, and a clear functional direction, and can form a consistent control logic with the closed-loop correction of the opening of the temperature regulating valve in subsequent steps.

[0035] In this embodiment, during step 300, the target mode selection is completed based on the available heating capacity of the circulating cooling water, the available heating capacity of the main steam, and the heating demand of the user area obtained in step 200, combined with the equipment health status represented by the operating dataset. The equipment health status refers to the state quantity obtained after consistent judgment of the operating status of the circulating water pump, heating pump, condensate pump, and booster pump, used to reflect whether the heating circuit has continuous operating capability. The preset normality criterion refers to the set of thresholds used to determine that the equipment health status is normal. The source of this threshold set is the statistical results of the baseline operating parameters in the initial stage of system commissioning or under stable operating conditions in this embodiment, and it can be corrected according to seasonal operating conditions. Specifically, as shown in Table 1, the preset normal condition criteria include at least the operating status criterion, the temperature deviation criterion, and the pressure difference deviation criterion. The operating status criterion is used to ensure that the circulating water pump, the heating pump, the condensate pump, and the booster pump are all in operation and there is no abnormal state among shutdown faults, overload alarms, or communication anomalies. The temperature deviation criterion is used to ensure that the difference between the temperature of the main heating pipeline and the target supply water temperature of the main heating pipeline is within an allowable range, which can be 2 to 5. The pressure difference deviation criterion is used to ensure that the pressure difference between the main heating pipeline and the heating return water pipeline is within a target range, which can be 0.05 to 0.15. When the pressure difference deviates from the target range, the preset normal condition criteria are not met. Based on the above preset normal condition criteria, this embodiment determines the equipment health status as normal or abnormal, and uses this as a constraint condition for target mode selection, thereby avoiding incorrect entry into high-load heating mode under conditions of pump unavailability or abnormal pipeline hydraulics.

[0036] Table 1 Criterion Threshold Table

[0037] Under the premise of satisfying the preset normal criteria, this embodiment further selects the target mode based on the matching relationship between available heating capacity and heating demand, and simultaneously determines the set of controllable execution objects corresponding to the target mode. Specifically, when the available heating capacity of the circulating cooling water meets the heating demand of the user area, this embodiment selects a single heat source redundant heating mode and determines the circulating cooling water as the target heat source. At the same time, the valves connected to the plate heat exchanger, the valves connected to the condensate tank, the temperature regulating valve, the heating pump, the circulating water pump, and the booster pump are included in the set of controllable execution objects to support the heating regulation on the circulating cooling water side. When the available heating capacity of the main steam meets the heating demand of the user area, this embodiment selects a single heat source redundant heating mode and determines the main steam as the target heat source. At the same time, the valves connected to the plate heat exchanger, the valves connected to the condensate tank, the pressure regulating valve, the temperature regulating valve, the heating pump, the condensate pump, and the booster pump are included in the set of controllable execution objects to support the heating regulation on the steam side and condensate recovery. When the available heating capacity of the circulating cooling water meets the heating demand of the main steam... When the available heating capacity is available and the preset normal criterion is met, this embodiment selects a composite heating mode and sets the controllable execution object set to simultaneously cover all execution objects on both the circulating cooling water side and the main steam side, so as to achieve coordinated heating of the two types of heat sources; when the available heating capacity of the circulating cooling water is insufficient to meet the heating demand of the user area and the main steam is available, this embodiment selects a tiered and differentiated heating mode, and simultaneously retains the execution objects on both the circulating cooling water side and the main steam side in the controllable execution object set, so as to support the operation mode in which the circulating cooling water side preheats the heating return water pipe and the main steam side supplements the heat, thereby forming a logical closed loop consistent with the target mode selection and the determination of the controllable execution object set, and providing a clear control object basis for the coordinated adjustment of valves and pumps in step 400.

[0038] Furthermore, in this embodiment, when executing step 400, the valves connected to the plate heat exchanger and the valves connected to the condensate tank are first controlled to open and close according to the target mode determined in step 300, so that the heat exchange path corresponding to the target heat source is in a connected state. The valves connected to the plate heat exchanger include at least circulating cooling water branch valves and main steam branch valves. The valves connected to the condensate tank are used to introduce the condensate generated by the heat exchange of the plate heat exchanger into the condensate tank to form a condensate recovery path. In this embodiment, under the single heat source redundant heating mode, the target heat source branch valves are adjusted to the open state, and the non-target heat source branch valves are adjusted to the closed state, so that the plate heat exchanger only receives heat provided by the target heat source; wherein, when circulating cooling water is the target heat source, the circulating cooling water branch valves are opened and the main steam branch valves are closed; when main steam is the target heat source, the main steam branch valves are opened and the circulating cooling water branch valves are closed. To ensure the determinism of valve state switching, this embodiment divides the valve opening and closing states into three categories: fully open, fully closed, and regulated open. Fully open corresponds to a valve opening degree of 90 to 100, fully closed corresponds to a valve opening degree of 0 to 5, and regulated open corresponds to a valve opening degree of 5 to 90. When the target heat source branch valve is opened, it will preferentially enter the fully open state to reduce the flow fluctuation on the inlet side of the plate heat exchanger.

[0039] In the combined heating mode, this embodiment simultaneously opens the circulating cooling water branch valves and the main steam branch valves, and also opens the valve connected to the condensate tank to connect the condensate recovery path. This allows the plate heat exchanger to receive heat input from both the circulating cooling water side and the main steam side within the same heating cycle. This embodiment limits the valve opening and closing control in the combined heating mode to two levels. The first level of control ensures that both types of branch valves are open, while the second level of control adjusts the opening of the two types of branch valves to maintain a stable heat source sharing ratio, provided that the target supply water temperature of the main heating pipeline is met. In this embodiment, the target supply water temperature of the main heating pipeline is used as the temperature constraint for composite heating, and the difference between the current temperature of the main heating pipeline and the target supply water temperature is used as the adjustment basis. When the difference is between 2 and 5, the opening of the circulating cooling water branch valve and the main steam branch valve remains unchanged. When the difference is greater than 5, the opening of the main steam branch valve is increased and the opening of the circulating cooling water branch valve is decreased. When the difference is less than 2, the opening of the main steam branch valve is decreased and the opening of the circulating cooling water branch valve is increased. This allows the heating contribution of the two types of heat sources in the composite heating mode to be adaptively adjusted according to the load changes in the user area, and the condensate recovery path is always kept connected to avoid heat exchange instability caused by condensate retention.

[0040] In the tiered heating system, this embodiment prioritizes opening the circulating cooling water branch valves to preheat the heating return water pipes. When the temperature of the main heating pipe is lower than the target supply water temperature, the main steam branch valves are opened to supplement the heating return water pipes with heat. Simultaneously, the valves connected to the condensate tank remain open. Preheating refers to using the lower-grade heat from the circulating cooling water side to raise the return water temperature of the heating return pipes, thereby reducing the supplementary heating load on the main steam side. Supplementary heating refers to using the higher-grade heat from the main steam side to raise the output temperature of the main heating pipes to the target supply water temperature. In this embodiment, the temperature threshold for triggering supplemental heating is set to the target water supply temperature of the main heating pipeline minus 1 to 3. When the temperature of the main heating pipeline is lower than the threshold, this embodiment opens the main steam branch valve and adjusts the opening degree of the main steam branch valve to 30 to 100 to improve the heating capacity. When the temperature of the main heating pipeline reaches or exceeds the threshold, this embodiment reduces the opening degree of the main steam branch valve to 0 to 30 to minimize supplemental heating, thereby achieving a tiered and differentiated heating effect with priority given to the circulating cooling water side and supplementation from the main steam side, and ensuring that the output temperature of the main heating pipeline stably meets the target water supply temperature while avoiding excessive participation of the main steam and energy waste.

[0041] After completing valve opening / closing control and temperature constraint control, this embodiment further executes the condensate recovery and transportation process to achieve continuous recovery and reuse of condensate generated by the plate heat exchanger. Specifically, in this embodiment, the condensate generated by the plate heat exchanger is channeled into the condensate tank via a valve connected to the condensate tank, and the condensate pump is controlled to transport the condensate in the condensate tank to the waste heat power generation deaerator. During the condensate pump transportation process, the valve connected to the condensate tank is kept open to maintain the continuity of condensate transportation. To avoid unstable condensate pump intake caused by condensate tank level fluctuations, this embodiment limits the effective condensate tank level range, which can be from 0.3 to 0.8. When the condensate tank level is below 0.3, the operating parameters of the condensate pump are restricted to avoid cavitation risks. When the condensate tank level is above 0.8, the operating parameters of the condensate pump are increased to accelerate delivery. Simultaneously, this embodiment limits the condensate pump's delivery capacity to meet the makeup water requirements of the waste heat power generation deaerator. The makeup water requirements can be set from 5 to 50 based on the main steam heating participation level. This ensures that the condensate recovery path remains connected in single-heat-source redundant heating mode, composite heating mode, and tiered fractional heating mode, supporting continuous heating on the main steam side, thereby improving the stability and continuity of steam-side heating from the waste heat boiler in the electric arc furnace.

[0042] Furthermore, in this embodiment, when executing step 500, the device health status is first generated based on the operational dataset, and it is then determined whether the preset anomaly criteria are met. The device health status refers to the status result obtained after quantitatively evaluating the operational availability of the heating pump, condensate pump, circulating water pump, and booster pump within the current acquisition period, which is used to provide input for primary / standby switching and anomaly isolation control. The preset anomaly criteria include at least a state anomaly criterion, a temperature deviation anomaly criterion, and a differential pressure deviation anomaly criterion. The state anomaly criterion is used to determine whether the operational status represented by the operational dataset meets any of the following conditions: shutdown failure, overload alarm, or communication anomaly. The temperature deviation anomaly criterion is used to determine whether the temperature of the main heating pipeline deviates from the target supply water temperature of the main heating pipeline by more than a preset temperature deviation threshold. The differential pressure deviation anomaly criterion is used to determine whether the differential pressure between the main heating pipeline and the heating return water pipeline deviates from a preset differential pressure threshold. In this embodiment, the preset temperature deviation threshold is set to 2 to 5, and the preset differential pressure threshold is set to a deviation of 0.02 to 0.10 from the boundary of the target differential pressure range, where the target differential pressure range can be 0.05 to 0.15. When the difference between the temperature of the main heating pipe and the target supply water temperature of the main heating pipe is greater than the preset temperature deviation threshold, this embodiment determines that the temperature deviation anomaly criterion is triggered. When the differential pressure between the main heating pipe and the return heating pipe is lower than 0.05 minus the deviation or higher than 0.15 plus the deviation, this embodiment determines that the differential pressure deviation anomaly criterion is triggered. To ensure that the anomaly determination is anti-interference, this embodiment limits the anomaly determination to be confirmed as meeting the preset anomaly criterion only if the anomaly conditions are met continuously for 2 to 3 acquisition cycles, thereby avoiding false switching caused by instantaneous fluctuations in a single acquisition cycle.

[0043] After confirming that the equipment health status meets the preset abnormality criteria, this embodiment performs master / standby switching and abnormality isolation control to maintain continuous heating in the main heating pipeline. The abnormality isolation control refers to removing the corresponding abnormal pump group from the control objects of the heating circuit and prohibiting it from continuing to participate in the current heating control process after determining that a target pump group is abnormal; the master / standby switching refers to adjusting the standby pump group to take over the heating task of the corresponding target pump group. Specifically, when the health status of the circulating water pump meets the preset abnormality criteria, this embodiment first performs abnormal isolation control on the corresponding circulating water pump and adjusts the standby circulating water pump to the operating state to restore the temperature and flow stability of the circulating cooling water supply and return water; when the health status of the heating pump meets the preset abnormality criteria, this embodiment performs abnormal isolation control on the corresponding heating pump and starts the standby heating pump to maintain the temperature difference between the main heating pipeline and the heating return water pipeline within the normal range of 5 to 10; when the health status of the condensate pump meets the preset abnormality criteria, this embodiment performs abnormal isolation control on the corresponding condensate pump and starts the standby condensate pump to maintain the continuity of condensate water supply from the condensate tank to the waste heat power generation deaerator; when the health status of the booster pump meets the preset abnormality criteria, this embodiment performs abnormal isolation control on the corresponding booster pump and starts the standby booster pump to restore the pressure difference between the main heating pipeline and the heating return water pipeline to 0.05 to 0.15. By using the differentiated switching for different pump sets as described above, this embodiment can limit the impact of equipment malfunctions to a localized area and restore the continuous heating capacity of the main heating pipeline within the same control cycle.

[0044] To ensure a verifiable closed loop between primary / standby switching and anomaly isolation control, this embodiment verifies the operational dataset after the standby equipment startup is completed, using the verification results as confirmation of continuous heating. Specifically, within 1 to 3 acquisition cycles after the standby equipment startup, this embodiment re-acquires the temperature of the main heating pipeline, the target supply water temperature of the main heating pipeline, the temperature of the return water pipeline, and the pressure difference between the main heating pipeline and the return water pipeline, and recalculates the temperature deviation and pressure difference deviation of the main heating pipeline. When the temperature deviation and pressure difference deviation of the main heating pipeline fall within the preset temperature deviation threshold and the pressure difference deviation falls within the preset pressure difference threshold, this embodiment confirms that the standby equipment has effectively taken over and maintained continuous heating of the main heating pipeline. If the temperature deviation is still greater than the preset temperature deviation threshold or the pressure difference deviation is still deviating from the preset pressure difference threshold within the verification window, this embodiment continues to mark the equipment health status as abnormal and restricts the selection priority of the single heat source redundant heating mode in subsequent control cycles to reduce the impact of a single pump group anomaly on heating stability. Through this verification mechanism, Furthermore, in this embodiment, when performing step 600, the temperature difference and pressure difference between the main heating pipe and the return heating pipe are first calculated based on the operating dataset formed in step 100. The temperature difference is then compared with a preset temperature difference target range, and the pressure difference is compared with a preset pressure difference target range to form feedback input for closed-loop regulation. The preset temperature difference target range refers to the reasonable temperature difference range that should be maintained between the main heating pipe and the return heating pipe under stable heating conditions, used to characterize the effective heating level of the heating circuit. The preset temperature difference target range can be 5 to 10. The preset pressure difference target range refers to the reasonable pressure difference range between the main heating pipe and the return heating pipe set to ensure the hydraulic stability of the heating network. The preset pressure difference target range can be 0.05 to 0.15. In this embodiment, the temperature difference and pressure difference are calculated and compared at least once in each control cycle. When the temperature difference is within the preset temperature difference target range and the pressure difference is within the preset pressure difference target range, the opening degree of the current pressure regulating valve, the opening degree of the temperature regulating valve, and the operating parameters of the heating pump are kept unchanged. When any indicator deviates from the corresponding target range, the corresponding deviation is used as the trigger condition for closed-loop correction, thereby avoiding frequent adjustment of pump and valve parameters when the heating load fluctuates slightly, and ensuring the stability of the adjustment process.

[0045] When the temperature difference between the main heating pipe and the return heating pipe exceeds the preset temperature difference target range, this embodiment prioritizes adjusting the opening of the temperature regulating valve to correct the output temperature of the main heating pipe, and simultaneously adjusts the operating parameters of the heating pump to ensure that the temperature change rate of the main heating pipe is consistent with the temperature change rate of the return water, thereby causing the temperature difference to gradually return to the preset temperature difference target range. When the pressure difference between the main heating pipe and the return heating pipe exceeds the preset pressure difference target range, this embodiment adjusts the opening of the pressure regulating valve to correct the hydraulic distribution of the heating circuit, and simultaneously adjusts the operating parameters of the heating pump to ensure that the pressure difference between the main heating pipe and the return heating pipe returns to the preset pressure difference target range. After completing the above closed-loop correction, this embodiment records the opening degree of the pressure regulating valve, the opening degree of the temperature regulating valve, and the operating parameters of the heating pump as pump and valve operating parameters. In the next control cycle, the pump and valve operating parameters are used as inputs for target mode selection and pump and valve control parameter updates, so that the target mode selection and pump and valve adjustment process can be continuously optimized based on historical correction results, thereby maintaining a stable output of the main heating pipeline under the conditions of heating load changes and operating condition disturbances.

[0046] Corresponding to the above methods, such as Figure 3 As shown, this embodiment also provides a redundant multi-source waste heat heating system for submerged arc furnaces based on intelligent management, including: The operation data acquisition unit is used to collect the temperature and pressure of the main steam pipe and water supply pipe of the waste heat boiler of the smelting workshop's electric arc furnace, the temperature and flow rate of the circulating cooling water supply and return water, the temperature of the main heating pipe and the heating return water pipe, the return water temperature of the user area, and the operating status of the circulating water pump, heating pump, condensate pump and booster pump, forming an operation dataset. The heating capacity assessment and demand determination unit is used to assess the available heating capacity of circulating cooling water and main steam based on the operational dataset, and to determine the heating demand of user areas and the target supply water temperature of the main heating pipeline. The heating mode selection unit is used to select a composite heating mode, a single heat source redundant heating mode, or a tiered differentiated heating mode as the target mode based on the available heating capacity and the equipment health status represented by the operation dataset, and to determine the set of controllable execution objects corresponding to the target mode. The set of controllable execution objects includes valves connected to the plate heat exchanger, valves connected to the condensate tank, pressure regulating valves, temperature regulating valves, heating pumps, condensate pumps, circulating water pumps, and booster pumps. The heat exchange and valve coordination control unit is used to control the opening and closing status of valves connected to the plate heat exchanger and valves connected to the condensate tank according to the target mode, adjust the pressure regulating valve and temperature regulating valve so that the heating main pipeline outputs hot water that meets the target supply water temperature, and collects the condensate generated by the heat exchange of the plate heat exchanger into the condensate tank and is transported to the waste heat power generation deaerator by the condensate pump. The pump set redundancy switching and abnormal isolation unit is used to perform main standby switching and abnormal isolation control on heating pumps, condensate pumps, circulating water pumps and booster pumps. When the health status of the equipment meets the preset abnormal judgment criteria, the standby equipment is started and the heating main pipeline is kept continuously heated. The heating operation closed-loop regulation and parameter update unit is used to use the temperature difference and pressure difference between the heating main pipeline and the heating return water pipeline as feedback to correct the opening degree of the pressure regulating valve, the opening degree of the temperature regulating valve, and the operating parameters of the heating pump in a closed loop. It records the pump and valve operating parameters after the closed-loop correction and uses the closed-loop corrected pump and valve operating parameters as input for target mode selection and pump and valve control parameter update in the next control cycle.

[0047] The various embodiments in this specification are described in a progressive manner, with each embodiment focusing on its differences from other embodiments. Similar or identical parts between embodiments can be referred to interchangeably. For the systems disclosed in the embodiments, since they correspond to the methods disclosed in the embodiments, the descriptions are relatively simple; relevant parts can be referred to the method section.

[0048] This document uses specific examples to illustrate the principles and implementation methods of the present invention. The descriptions of the above embodiments are only for the purpose of helping to understand the method and core ideas of the present invention. Furthermore, those skilled in the art will recognize that, based on the ideas of the present invention, there will be changes in the specific implementation methods and application scope. Therefore, the content of this specification should not be construed as a limitation of the present invention.

Claims

1. A method for multi-source waste heat heating in a redundant submerged arc furnace based on intelligent management, characterized in that, include: The system collects the temperature and pressure of the main steam pipe and water supply pipe of the waste heat boiler in the smelting workshop, the temperature and flow rate of the circulating cooling water supply and return water, the temperature of the main heating pipe and the heating return water pipe, the return water temperature of the user area, and the operating status of the circulating water pump, heating pump, condensate pump and booster pump to form an operating dataset. Based on the operational dataset, assess the available heating capacity of the circulating cooling water and the main steam, and determine the heating demand of the user area and the target supply water temperature of the main heating pipeline; Based on the available heating capacity and the equipment health status represented by the operation dataset, a composite heating mode, a single heat source redundant heating mode, or a tiered differentiated heating mode is selected as the target mode, and a set of controllable execution objects corresponding to the target mode is determined; the set of controllable execution objects includes valves connected to the plate heat exchanger, valves connected to the condensate tank, pressure regulating valves, temperature regulating valves, heating pumps, condensate pumps, circulating water pumps, and booster pumps; For the target mode, the opening and closing states of the valves connected to the plate heat exchanger and the valves connected to the condensate tank are controlled, and the pressure regulating valve and the temperature regulating valve are adjusted so that the main heating pipeline outputs hot water that meets the target water supply temperature, and the condensate generated by the heat exchange of the plate heat exchanger is collected into the condensate tank and transported to the waste heat power generation deaerator by the condensate pump. The heating pump, the condensate pump, the circulating water pump and the booster pump are subject to main / standby switching and abnormal isolation control. When the health status of the equipment meets the preset abnormality criteria, the standby equipment is started and the heating main pipeline is kept continuously heated. Using the temperature and pressure difference between the main heating pipe and the return heating pipe as feedback, the opening degree of the pressure regulating valve, the opening degree of the temperature regulating valve, and the operating parameters of the heating pump are corrected in a closed loop. The corrected pump and valve operating parameters are recorded, and in the next control cycle, the corrected pump and valve operating parameters are used as the input for the target mode selection and pump and valve control parameter update.

2. The method for multi-source waste heat heating of redundant submerged arc furnaces based on intelligent management according to claim 1, characterized in that, The system collects the temperature and pressure of the main steam pipe and water supply pipe of the waste heat boiler in the smelting workshop, the temperature and flow rate of the circulating cooling water supply and return water, the temperature of the main heating pipe and heating return water pipe, and the return water temperature of the user area. It also collects the operating status of the circulating water pump, heating pump, condensate pump, and booster pump to form an operational dataset, including: The temperature and pressure of the main steam pipe and the temperature and pressure of the water supply pipe are collected within a preset collection period. The temperature and flow rate of the circulating cooling water supply and the temperature and flow rate of the circulating cooling water return are collected within the preset collection period. The temperature of the main heating pipe, the temperature of the heating return pipe, and the return water temperature of the user area are collected within the preset collection period. The operating status of the circulating water pump, the heating pump, the condensate pump and the booster pump is collected within the preset collection period; The operating dataset is formed by compiling the temperature and pressure of the main steam pipe and the water supply pipe, the temperature and flow rate of the circulating cooling water supply and the circulating cooling water return, the temperature of the main heating pipe and the heating return pipe, the return water temperature of the user area, and the operating status of the circulating water pump, the heating pump, the condensate pump and the booster pump.

3. The method for multi-source waste heat heating of redundant submerged arc furnaces based on intelligent management according to claim 1, characterized in that, The available heating capacity of the circulating cooling water and the main steam is evaluated based on the operational dataset, including: Based on the circulating cooling water supply temperature, circulating cooling water return temperature, and circulating cooling water return flow rate in the running dataset, the available heating capacity of the circulating cooling water is calculated. Based on the temperature and pressure of the main steam pipe in the running dataset, the thermal parameters of the main steam are determined from the preset steam thermal parameter table, and the available heating capacity of the main steam is calculated in combination with the temperature of the heating return water pipe. The available heating capacity of the circulating cooling water and the available heating capacity of the main steam are used as the input for selecting the target mode.

4. The method for multi-source waste heat heating of redundant submerged arc furnaces based on intelligent management according to claim 1, characterized in that, Determining the heat demand of the user area and the target water supply temperature of the main heating pipeline includes: Based on the temperature of the main heating pipe and the temperature of the return heating pipe in the running dataset, the temperature difference between the main heating pipe and the return heating pipe is calculated, and the heating demand of the user area is determined according to the temperature difference. Based on the return water temperature of the user area in the running dataset and the preset heating demand determination threshold, the heating demand of the user area is corrected. The target water supply temperature of the main heating pipeline is determined based on the revised heating demand of the user area, and the target water supply temperature of the main heating pipeline is used as the target value for adjusting the temperature regulating valve.

5. The method for multi-source waste heat heating of redundant submerged arc furnaces based on intelligent management according to claim 1, characterized in that, Based on the available heating capacity and the equipment health status represented by the operational dataset, a composite heating mode, a single heat source redundant heating mode, or a tiered differentiated heating mode is selected as the target mode, including: When the available heating capacity of the circulating cooling water meets the heating demand of the user area and the health status of the equipment meets the preset normal criteria, the single heat source redundant heating mode is selected, and the circulating cooling water is identified as the target heat source. When the available heating capacity of the main steam meets the heating demand of the user area and the health status of the equipment meets the preset normal criteria, the single heat source redundant heating mode is selected and the main steam is identified as the target heat source. When both the available heating capacity of the circulating cooling water and the available heating capacity of the main steam are available and the health status of the equipment meets the preset normal criteria, the composite heating mode is selected. When the available heating capacity of the circulating cooling water is insufficient to meet the heating demand of the user area and the main steam is available, the tiered heating mode is selected.

6. The method for multi-source waste heat heating of redundant submerged arc furnaces based on intelligent management according to claim 1, characterized in that, For the target mode, controlling the opening and closing states of the valves connected to the plate heat exchanger and the valves connected to the condensate tank includes: In the single heat source redundant heating mode, the target heat source branch valve in the valve connected to the plate heat exchanger is opened, and the non-target heat source branch valve in the valve connected to the plate heat exchanger is closed. In the combined heating mode, the circulating cooling water branch valve and the main steam branch valve in the valve connected to the plate heat exchanger are opened, and the valve connected to the condensate tank is opened to connect the condensate recovery path. In the tiered heating mode, the circulating cooling water branch valve in the valve connected to the plate heat exchanger is opened to preheat the heating return water pipeline. When the temperature of the main heating pipeline is lower than the target supply water temperature of the main heating pipeline, the main steam branch valve in the valve connected to the plate heat exchanger is opened to supplement the heating return water pipeline, while the valve connected to the condensate tank is kept open.

7. The method for multi-source waste heat heating of redundant submerged arc furnaces based on intelligent management according to claim 1, characterized in that, The condensate generated by the plate heat exchanger is collected in the condensate tank and then pumped by the condensate pump to the waste heat power generation deaerator, including: The condensate generated by the plate heat exchanger is channeled into the condensate tank via the valve connected to the condensate tank. The condensate pump is controlled to transport the condensate in the condensate tank to the waste heat power generation deaerator; During the condensate pumping process, the valve connected to the condensate tank is kept open to maintain the continuity of condensate delivery.

8. The method for multi-source waste heat heating of redundant submerged arc furnaces based on intelligent management according to claim 1, characterized in that, The heating pump, condensate pump, circulating water pump, and booster pump are subject to main / standby switching and abnormal isolation control. When the health status of the equipment meets the preset abnormality criteria, the standby equipment is activated and the main heating pipeline is kept continuously supplied with heat, including: The preset anomaly criterion is set as follows: the operating state represented by the operating dataset satisfies any of the following conditions: shutdown failure, overload alarm, or communication anomaly; or the temperature of the main heating pipe deviates from the target water supply temperature of the main heating pipe by more than a preset temperature deviation threshold; or the pressure difference between the main heating pipe and the return water pipe deviates from a preset pressure difference threshold. When the health status of the circulating water pump meets the preset abnormality criterion, the corresponding circulating water pump is isolated and the standby circulating water pump is started. When the health status of the heating pump meets the preset abnormality criterion, the corresponding heating pump is isolated and the standby heating pump is started. When the health status of the condensate pump meets the preset abnormality criterion, the corresponding condensate pump is isolated and the standby condensate pump is started. When the health status of the booster pump meets the preset abnormality criterion, the corresponding booster pump is isolated and the standby booster pump is started.

9. The method for multi-source waste heat heating of redundant submerged arc furnace based on intelligent management according to claim 1, characterized in that, Using the temperature and pressure differences between the main heating pipe and the return heating pipe as feedback, the opening of the pressure regulating valve, the opening of the temperature regulating valve, and the operating parameters of the heating pump are corrected in a closed loop. The corrected pump and valve operating parameters are recorded, and in the next control cycle, these corrected parameters are used as inputs for target mode selection and pump and valve control parameter updates. The temperature difference and pressure difference between the main heating pipe and the return heating pipe are calculated based on the running dataset, and the temperature difference is compared with a preset temperature difference target range, and the pressure difference is compared with a preset pressure difference target range. When the temperature difference exceeds the preset temperature difference target range, the opening of the temperature regulating valve is adjusted and the operating parameters of the heating pump are adjusted simultaneously so that the temperature difference returns to the preset temperature difference target range. When the pressure difference exceeds the preset pressure difference target range, the opening of the pressure regulating valve is adjusted and the operating parameters of the heating pump are adjusted simultaneously to bring the pressure difference back to the preset pressure difference target range. Record the pump and valve operating parameters after the closed-loop correction, and update the input of the target mode selection and the pump and valve control parameter update based on the closed-loop corrected pump and valve operating parameters in the next control cycle.

10. A redundant submerged arc furnace multi-source waste heat heating system based on intelligent management, characterized in that, include: The operation data acquisition unit is used to collect the temperature and pressure of the main steam pipe and water supply pipe of the waste heat boiler of the smelting workshop's electric arc furnace, the temperature and flow rate of the circulating cooling water supply and return water, the temperature of the main heating pipe and the heating return water pipe, the return water temperature of the user area, and the operating status of the circulating water pump, heating pump, condensate pump and booster pump, forming an operation dataset. The heating capacity assessment and demand determination unit is used to assess the available heating capacity of the circulating cooling water and the main steam based on the operating dataset, and to determine the heating demand of the user area and the target supply water temperature of the main heating pipeline. The heating mode selection unit is used to select a composite heating mode, a single heat source redundant heating mode, or a tiered differentiated heating mode as the target mode based on the available heating capacity and the equipment health status represented by the operation dataset, and to determine the set of controllable execution objects corresponding to the target mode; the set of controllable execution objects includes valves connected to the plate heat exchanger, valves connected to the condensate tank, pressure regulating valves, temperature regulating valves, heating pumps, condensate pumps, circulating water pumps, and booster pumps; The heat exchange and valve coordination control unit is used to control the opening and closing status of the valves connected to the plate heat exchanger and the valves connected to the condensate tank for the target mode, adjust the pressure regulating valve and the temperature regulating valve so that the heating main pipeline outputs hot water that meets the target water supply temperature, and collect the condensate generated by the heat exchange of the plate heat exchanger into the condensate tank and transport it to the waste heat power generation deaerator by the condensate pump. The pump set redundancy switching and abnormal isolation unit is used to perform main standby switching and abnormal isolation control on the heating pump, the condensate pump, the circulating water pump and the booster pump. When the health status of the equipment meets the preset abnormality criteria, the standby equipment is started and the heating main pipeline is kept continuously heated. The heating operation closed-loop regulation and parameter update unit is used to use the temperature difference and pressure difference between the heating main pipe and the heating return water pipe as feedback to correct the opening degree of the pressure regulating valve, the opening degree of the temperature regulating valve, and the operating parameters of the heating pump in a closed loop, and record the pump and valve operating parameters after the closed-loop correction. In the next control cycle, the pump and valve operating parameters after the closed-loop correction are used as the input for the target mode selection and pump and valve control parameter update.

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