Composite reagent feeding control method and system based on boiler water treatment of drum boiler and medium

Abstract

The invention provides a composite reagent adding control method and system based on boiler water treatment of a drum boiler and a medium. The method comprises the steps that boiler water parameter information is obtained, boiler water quality information is analyzed based on the boiler water parameter information, the boiler water quality information is analyzed based on a DCS distributed control system, and a reagent adding control strategy is output in real time. Controlling the operation parameters of the dosing pump and the flow of the composite agent based on the dosing control strategy; acquiring liquid level information of a dosing tank; generating composite medicament supplementing information based on the liquid level descending state information of the dosing tank, and supplementing the composite medicament in the dosing tank based on the composite medicament supplementing information; according to boiler water quality requirements, boiler water quality information is analyzed through a DCS (Distributed Control System), so that a dynamic dosing control strategy is generated, the dosing amount of a composite medicament is accurately controlled, the control precision is improved, and meanwhile, whether the composite medicament in a dosing tank meets requirements or not is analyzed in the dosing process, so that the composite medicament is quickly supplemented.

Description

Technical Field

[0001] The present application relates to the technical field of dosing control, and in particular to a composite agent dosing control method, system and medium based on water treatment in a drum boiler. Background Art

[0002] Steam boiler operation involves a continuous evaporation and concentration of boiler water. To ensure safe and efficient operation, continuous water treatment is required within the boiler drum. Typically, this involves injecting scale inhibitors, descaling agents, and alkalinity agents into the drum. The traditional practice is to inject trisodium phosphate into the boiler drum, a method used in the boiler industry for nearly four decades. Its advantages include low price, steam quality indicators that meet operational requirements, and extensive experience. Its disadvantages include high boiler blowdown, significant energy waste, and high phosphorus concentrations, which can negatively impact the environment.

[0003] In recent years, driven by demands for refined management, energy conservation, environmental protection, coal conservation, and carbon reduction within the boiler industry, particularly in regions with stringent environmental regulations that restrict the discharge of phosphorus-containing substances, the development of a new organic composite agent to replace traditional trisodium phosphate has become increasingly necessary. Currently, these new agents, developed by some companies, have undergone pilot testing and functional refinement within the boiler industry, achieving promising results. Unlike trisodium phosphate, which relies on a single chemical reaction, organic composite agents react with harmful ions in boiler water through complexation and recombination. This high concentration ratio reduces boiler blowdown to below 0.5%, significantly reducing boiler blowdown. Furthermore, they exhibit a polyamine coating effect, forming a hydrophobic protective film on metal heat exchange surfaces, enhancing operational safety. The discharged water is phosphorus-free and environmentally friendly. Using these new composite organic agents to replace traditional trisodium phosphate is a trend in boiler water treatment within the boiler industry.

[0004] However, controlling the dosage of new organic compound reagents is a problem currently encountered in the promotion of new technologies. The dosage of trisodium phosphate is controlled by detecting the phosphate concentration in the boiler water with online instruments, combining it with boiler water vapor indicators, and controlling the operating time of the dosing pump to control the dosage. There are currently no corresponding online detection instruments or equipment to monitor the main components of new organic reagents, and the dosage cannot be controlled by controlling the concentration of the main organic reagent components in the boiler water. Currently, the operation of the dosing pump can only be controlled by detecting the changing trend of the boiler water vapor indicators. Due to the long distance from the boiler drum to the online monitoring sampling point and the dosing room, there is a serious lag in the dosing, resulting in untimely and inaccurate dosing control, which can only be adjusted manually through experience.

[0005] In view of the above reasons, the present invention invents a dosing control method based on an organic composite agent for water treatment in a boiler to solve the problem of controlling the dosage of a new organic agent. The organic composite agent has a strong complexing effect on harmful ions in boiler water, and has a strong water quality stabilization and regulation function. When the pH and conductivity of the boiler water meet the requirements, the boiler steam index fully meets the requirements, that is, only the boiler water index is controlled, and there is no need to control the steam index. The boiler water vapor index is affected by multiple factors such as feed water quality, boiler feed water volume, dosing amount, and sewage discharge volume; among them, the change in boiler feed water volume is the main factor affecting the change in water vapor index, the dosing amount and the feed water volume are in a direct linear relationship, and the ratio of the compound agent addition amount to the feed water volume is a constant value, which is determined by the characteristics of different compound agents; the dosing amount can be obtained through high-precision liquid level detection of the dosing tank.

[0006] The present invention leverages the advantages of a power plant's DCS system, integrating online parameters such as boiler water index online detection data, instantaneous feed water flow, and dosing tank liquid level, and assigns a logical algorithm to the DCS system. Changes in feed water volume serve as the primary adjustment for dosing dosage, while fluctuations in boiler water indexes serve as fine-tuning. The organic composite reagent can be accurately and timely added based on changes in boiler load and dynamic changes in water quality (i.e., changes in feed water volume). A multi-interval operating mode is set based on boiler load variation intervals, with each interval executing the dosing dosage corresponding to the average load. The dosing dosage is adjusted by controlling the pump's operating time. Fluctuations in boiler water indexes serve as auxiliary fine-tuning for dosing dosage. Summary of the Invention

[0007] The purpose of the embodiments of the present application is to provide a composite reagent dosing control method, system and medium based on the water treatment in the drum boiler, analyze the boiler water quality information through the DCS distributed control system according to the boiler water quality requirements, thereby generating a dynamic dosing control strategy, accurately controlling the dosing amount of the composite reagent, improving the control accuracy, and at the same time analyzing whether the composite reagent in the dosing tank meets the needs during the dosing process, so as to quickly replenish the composite reagent.

[0008] The present application also provides a composite agent dosing control method for drum boiler water treatment, comprising: Obtain boiler water parameter information, and analyze boiler water quality information based on the boiler water parameter information; Analyze boiler water quality information based on the DCS distributed control system and output dosing control strategy in real time; Control the operating parameters of the dosing pump and the flow rate of the compound agent based on the dosing control strategy; Obtain the liquid level information of the dosing tank and analyze the liquid level drop status information of the dosing tank based on the flow rate of the compound reagent; The compound agent replenishment information is generated based on the liquid level drop status information of the dosing tank, and the compound agent in the dosing tank is replenished based on the compound agent replenishment information.

[0009] Optionally, in the composite reagent dosing control method based on drum boiler water treatment according to an embodiment of the present application, obtaining boiler water parameter information and analyzing boiler water quality information based on the boiler water parameter information specifically include: Obtaining boiler water parameter information, including boiler water pH value, boiler water online conductivity, and boiler feed water flow rate; Setting water quality standard information based on drum boiler steam quality standards and blowdown requirements, wherein the water quality standard information includes at least a standard pH value, a standard conductivity, and a standard feed water flow rate; Compare the pH value of boiler water with the standard pH value to obtain the pH deviation rate; compare the online conductivity of boiler water with the standard conductivity to obtain the conductivity deviation rate; compare the boiler feed water flow rate with the standard feed water flow rate to obtain the feed water flow deviation rate; Analyze abnormal data of boiler water parameter information based on pH deviation rate, conductivity deviation rate and feed water flow deviation rate; The boiler water quality information is analyzed based on the abnormal data, and the boiler water quality information is evaluated according to the water quality evaluation rules to obtain the boiler water quality information.

[0010] Optionally, in the composite reagent dosing control method based on drum boiler water treatment according to an embodiment of the present application, the DCS distributed control system analyzes boiler water quality information and outputs a dosing control strategy in real time, specifically including: The DCS distributed control system includes an online detection terminal, a data acquisition platform and a dosing execution unit; The online detection terminal and data acquisition platform include a frequency converter, a liquid level meter, a conductivity meter, a pH meter and a flow sensor; Obtain boiler water pH value, conductivity, water supply, steam production, and sewage discharge based on the data acquisition platform; The online detection terminal detects the pH value, conductivity, water supply, steam production, and wastewater discharge of boiler water, and analyzes boiler water quality information; Match the corresponding dosing control strategy based on boiler water quality information.

[0011] Optionally, in the composite reagent dosing control method based on drum boiler water treatment according to an embodiment of the present application, controlling the operating parameters of the dosing pump and the flow rate of the composite reagent based on the dosing control strategy specifically includes: Set water quality standard information based on drum boiler steam quality standards and blowdown requirements; Compare the boiler water quality information with the water quality standard information to obtain the water quality difference value; Match the corresponding dosing control strategy based on water quality difference value; Generate dosing parameters based on the dosing control strategy, the dosing parameters including the operating parameters of the dosing pump, the flow rate of the compound agent, and the total amount of the compound agent, the operating parameters of the dosing pump including the operating power, operating time, flow rate, and pressure of the dosing pump; Obtain the current flow rate of the compound medicine, compare the current flow rate with the set flow rate value, and obtain the flow rate difference; Correction information is generated based on the flow rate difference, and operating parameters of the dosing pump are adjusted according to the correction information.

[0012] Optionally, in the composite reagent dosing control method based on drum boiler water treatment according to an embodiment of the present application, obtaining the liquid level information of the dosing tank and analyzing the liquid level drop status information of the dosing tank based on the flow rate of the composite reagent specifically include: Analyze the flow rate of compound medicine per unit time based on the dosing control strategy; Set an analysis time window, which includes several time nodes, recorded as the first time node, the second time node...the Nth time node; Obtain the liquid level information of the dosing tank at the first time node and the Mth time node and compare them to obtain the liquid level difference, where M is a positive integer greater than 1 and less than N; Generate information on the liquid level drop status of the dosing tank within the analysis time window based on the liquid level difference.

[0013] Optionally, in the composite reagent dosing control method based on drum boiler in-furnace water treatment according to an embodiment of the present application, composite reagent replenishment information is generated based on the dosing tank liquid level drop status information, and the composite reagent in the dosing tank is replenished based on the composite reagent replenishment information, specifically including: Obtain the liquid drop status information of the dosing tank and analyze the liquid level drop rate; Obtain the volume and current liquid level of the dosing tank, and calculate the total amount of the current compound agent in the dosing tank based on the volume and current liquid level of the dosing tank; The compound agent usage time is calculated based on the liquid level drop rate and the total amount of the current compound agent in the dosing tank; A replenishment time node is set based on the usage time of the compound medicine to replenish the compound medicine.

[0014] The raw materials for preparing the composite agent include a combination of two or more of a complexing agent, a corrosion inhibitor, a dispersant, an alkalizing agent and a defoaming agent.

[0015] In a second aspect, an embodiment of the present application provides a composite reagent dosing control system based on drum boiler water treatment, the system comprising: a memory and a processor, the memory including a program for a composite reagent dosing control method based on drum boiler water treatment, the program for a composite reagent dosing control method based on drum boiler water treatment being executed by the processor to implement the following steps: Obtain boiler water parameter information, and analyze boiler water quality information based on the boiler water parameter information; Analyze boiler water quality information based on the DCS distributed control system and output dosing control strategy in real time; Control the operating parameters of the dosing pump and the flow rate of the compound agent based on the dosing control strategy; Obtain the liquid level information of the dosing tank and analyze the liquid level drop status information of the dosing tank based on the flow rate of the compound reagent; The compound agent replenishment information is generated based on the liquid level drop status information of the dosing tank, and the compound agent in the dosing tank is replenished based on the compound agent replenishment information.

[0016] Optionally, in the composite reagent dosing control system based on drum boiler water treatment according to the embodiment of the present application, obtaining boiler water parameter information and analyzing boiler water quality information based on the boiler water parameter information specifically include: Obtaining boiler water parameter information, including boiler water pH value, boiler water online conductivity, and boiler feed water flow rate; Setting water quality standard information based on drum boiler steam quality standards and blowdown requirements, wherein the water quality standard information includes at least a standard pH value, a standard conductivity, and a standard feed water flow rate; Compare the pH value of boiler water with the standard pH value to obtain the pH deviation rate; Compare the online conductivity of boiler water with the standard conductivity to obtain the conductivity deviation rate; Compare the boiler feed water flow rate with the standard feed water flow rate to obtain the feed water flow rate deviation rate; Analyze abnormal data of boiler water parameter information based on pH deviation rate, conductivity deviation rate and feed water flow deviation rate; The boiler water quality information is analyzed based on the abnormal data, and the boiler water quality information is evaluated according to the water quality evaluation rules to obtain the boiler water quality information.

[0017] Optionally, in the composite reagent dosing control system based on drum boiler water treatment described in the embodiment of the present application, the DCS distributed control system analyzes boiler water quality information and outputs a dosing control strategy in real time, specifically including: The DCS distributed control system includes an online detection terminal, a data acquisition platform and a dosing execution unit; The online detection terminal and data acquisition platform include a frequency converter, a liquid level meter, a conductivity meter, a pH meter and a flow sensor; Obtain boiler water pH value, conductivity, water supply, steam production, and sewage discharge based on the data acquisition platform; The online detection terminal detects the pH value, conductivity, water supply, steam production, and wastewater discharge of boiler water, and analyzes boiler water quality information; Match the corresponding dosing control strategy based on boiler water quality information.

[0018] In a third aspect, an embodiment of the present application also provides a computer-readable storage medium, which includes a composite reagent dosing control method program based on water treatment in a drum boiler. When the composite reagent dosing control method program based on water treatment in a drum boiler is executed by a processor, the steps of the composite reagent dosing control method based on water treatment in a drum boiler as described in any one of the above items are implemented.

[0019] From the above, it can be seen that the embodiment of the present application provides a composite reagent dosing control method, system and medium based on water treatment in a drum boiler, which obtains boiler water parameter information, analyzes boiler water quality information based on the boiler water parameter information, analyzes boiler water quality information based on a DCS distributed control system, and outputs a dosing control strategy in real time; controls the operating parameters of the dosing pump and the flow rate of the composite reagent based on the dosing control strategy; obtains the liquid level information of the dosing tank; generates composite reagent supplement information based on the liquid level drop status information of the dosing tank, and supplements the composite reagent in the dosing tank based on the composite reagent supplement information; analyzes the boiler water quality information through the DCS distributed control system according to the boiler water quality requirements, thereby generating a dynamic dosing control strategy, accurately controlling the dosing amount of the composite reagent, improving the control accuracy, and at the same time analyzing whether the composite reagent in the dosing tank meets the needs during the dosing process, thereby quickly replenishing the composite reagent. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the following is a brief introduction to the drawings required for use in the embodiments of the present application. It should be understood that the following drawings only show certain embodiments of the present application and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other relevant drawings can be obtained based on these drawings without creative work.

[0021] Figure 1 A flow chart of a composite reagent dosing control method for drum boiler water treatment provided in an embodiment of the present application; Figure 2 A flow chart for obtaining boiler water quality information based on a composite reagent dosing control method for drum boiler water treatment according to an embodiment of the present application; Figure 3 This is a block diagram of a composite reagent dosing control system based on drum boiler water treatment provided in an embodiment of the present application. DETAILED DESCRIPTION

[0022] The technical solutions in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all of the embodiments. The components of the embodiments of the present application generally described and shown in the drawings here can be arranged and designed in various different configurations. Therefore, the following detailed description of the embodiments of the present application provided in the drawings is not intended to limit the scope of the application for protection, but merely represents the selected embodiments of the present application. Based on the embodiments of the present application, all other embodiments obtained by those skilled in the art without making creative work fall within the scope of protection of the present application.

[0023] It should be noted that similar reference numerals and letters represent similar items in the following drawings. Therefore, once an item is defined in one drawing, it does not need to be further defined or explained in subsequent drawings. At the same time, in the description of this application, the terms "first", "second", etc. are only used to distinguish the description and should not be understood as indicating or implying relative importance.

[0024] Please refer to Figure 1 , Figure 1 This is a flow chart of a composite reagent dosing control method based on drum boiler water treatment in some embodiments of the present application. The composite reagent dosing control method based on drum boiler water treatment is used in a terminal device and includes the following steps: S101, obtaining boiler water parameter information, and analyzing boiler water quality information based on the boiler water parameter information; S102, based on the DCS distributed control system, analyzes boiler water quality information and outputs dosing control strategies in real time; S103, controlling the operating parameters of the dosing pump and the flow rate of the compound agent based on the dosing control strategy; S104, obtaining the liquid level information of the dosing tank, and analyzing the liquid level drop status information of the dosing tank based on the flow rate of the composite agent; S105 , generating compound medicine replenishment information based on the information on the liquid level drop in the dosing tank, and replenishing the compound medicine in the dosing tank based on the compound medicine replenishment information.

[0025] It should be noted that this application utilizes a DCS distributed control system to automatically and timely add chemicals and precisely control boiler steam and water parameters in real time, achieving energy conservation and emission reduction in the boiler blowdown system. This application utilizes existing operator stations and DCS communication, requiring no hardware changes, making implementation quick and easy. Furthermore, the user only needs to provide the system with the Modbus address table required. The existing operator station and DCS system share a local area network, and the data volume is small (estimated to be under 100 points). Standard Modbus / TCP communication is preferred, eliminating the need for OPC software installation. The application software monitors the DCS communication status and, if communication is abnormal, transfers control to the DCS.

[0026] Furthermore, the steam-water indicators of the present application are stable, and the boiler blowdown rate can be reduced by more than 80%, from the usual 3% to 5% to below 0.5%, which can greatly reduce the amount of reagents used. For a boiler evaporation rate of 1 ton / hour, the amount of composite reagents used is about 0.008~0.015kg / h, which can also greatly save the cost of reagents. The salt-dissolving capacity of the boiler water is enhanced, and the concentration ratio of the boiler water is increased from 20~30 times when using trisodium phosphate to 200~300 times, which reduces the frequent manual operation of fixed-discharge and continuous-discharge valves, reduces the chance of valve failure, and greatly reduces the discharge of boiler sewage, thereby greatly reducing the amount of desalted water produced and saving corresponding costs.

[0027] Please refer to Figure 2 , Figure 2 This is a flow chart for obtaining boiler water quality information based on a composite reagent dosing control method for drum boiler water treatment in some embodiments of the present application. According to an embodiment of the present invention, obtaining boiler water parameter information and analyzing boiler water quality information based on the boiler water parameter information specifically include: S201, obtaining boiler water parameter information, including boiler water pH value, boiler water online conductivity and boiler feed water flow rate; S202, setting water quality standard information based on the drum boiler steam quality standard and blowdown requirements, where the water quality standard information includes at least a standard pH value, a standard conductivity, and a standard feed water flow rate; S203, comparing the pH value of the boiler water with the standard pH value to obtain a pH deviation rate; comparing the online conductivity of the boiler water with the standard conductivity to obtain a conductivity deviation rate; comparing the boiler feed water flow rate with the standard feed water flow rate to obtain a feed water flow deviation rate; S204, analyzing abnormal data of boiler water parameter information based on pH deviation rate, conductivity deviation rate, and feed water flow deviation rate; S205 , analyzing boiler water quality information based on the abnormal data, evaluating the boiler water quality information according to water quality evaluation rules, and obtaining boiler water quality information.

[0028] It should be noted that by collecting real-time parameters such as the online boiler water pH value, online boiler water conductivity, boiler feed water flow, compound chemical storage tank level, and dosing flow as comprehensive input signals, and through a computer-specific logic algorithm, an output signal is formed to control the dosing pump, thereby achieving an accurate and timely dosing operation process.

[0029] Specifically, the actual dosage of the reagent in this application is about 0.01 kg / hour for 1 ton / hour of boiler evaporation, that is, the dosage of the reagent for 100 tons / hour of boiler evaporation is about 1 kg per hour. The amount of reagent added to the boiler is calculated by the drop in the liquid level in the dosing tank, and thus the concentration of the reagent in the boiler water is calculated; at the same time, the reagent concentration corresponds to the pH value range and conductivity range monitored by the control system.

[0030] According to an embodiment of the present invention, the DCS distributed control system analyzes boiler water quality information and outputs a dosing control strategy in real time, specifically including: The DCS distributed control system includes an online detection terminal, a data acquisition platform and a dosing execution unit; The online detection terminal and data acquisition platform include a frequency converter, a liquid level meter, a conductivity meter, a pH meter and a flow sensor; Obtain boiler water pH value, conductivity, water supply, steam production, and sewage discharge based on the data acquisition platform; The online detection terminal detects the pH value, conductivity, water supply, steam production, and wastewater discharge of boiler water, and analyzes boiler water quality information; Match the corresponding dosing control strategy based on boiler water quality information.

[0031] It should be noted that the application software was developed to enter evaluation indicators including but not limited to boiler water pH value, conductivity, water supply, steam production, and sewage discharge into the historical database. The next step was to clean the data, and after multiple revisions, logical thinking was formed and implanted into the factory's existing DCS control system.

[0032] Specifically, the dosing execution agencies include: Metering pump group: uses variable frequency metering pump (such as plunger pump), DCS adjusts the frequency (0~50Hz) through 4-20mA signal, with an accuracy of ±1%, and starts on demand; Chemical storage tank: equipped with liquid level sensors (ultrasonic or magnetic flaps), DCS monitors the chemical level in real time and issues early warnings; DCS adopts a multi-level hardware architecture, decomposing control functions into devices at different levels to avoid the single point of failure problem of centralized control.

[0033] The field control layer (bottom-level decentralized core) includes; Field controller (Control Station): directly connected to sensors and actuators, responsible for local data acquisition, logic control and closed-loop regulation (such as PID control). Each controller independently handles the control tasks of a specific area or process, such as temperature and pressure control of a chemical reactor. I / O module: connects to the controller to realize the input and output of analog quantities (such as temperature and flow) and digital quantities (such as switch signals), and supports hot plugging for easy maintenance; Field instruments: These include sensors (such as temperature sensors and pressure transmitters) and actuators (such as control valves and motors), which are distributed throughout the production site and interact directly with the controlled objects.

[0034] The operations monitoring layer includes; Operator Station: Engineers and operators monitor the entire system status and issue operating instructions through the graphical interface (HMI), but do not directly participate in real-time control to avoid the impact of human intervention on decentralized control. Engineer Station: Used for system configuration, programming, and maintenance. It can remotely download control programs to field controllers to achieve centralized configuration of distributed control logic.

[0035] The management team includes; Data server: collects data from each controller, stores and analyzes it, and provides decision support for production management, but does not interfere with the real-time control process.

[0036] According to an embodiment of the present invention, the operating parameters of the dosing pump and the flow rate of the compound agent are controlled based on the dosing control strategy, specifically including: Set water quality standard information based on drum boiler steam quality standards and blowdown requirements; Compare the boiler water quality information with the water quality standard information to obtain the water quality difference value; Match the corresponding dosing control strategy based on water quality difference value; Generate dosing parameters based on the dosing control strategy. The dosing parameters include the operating parameters of the dosing pump, the flow rate of the compound agent, and the total amount of the compound agent. The operating parameters of the dosing pump include the operating power, operating time, flow rate, and pressure of the dosing pump. Obtain the current flow rate of the compound medicine, compare the current flow rate with the set flow rate value, and obtain the flow rate difference; Correction information is generated based on the flow rate difference, and operating parameters of the dosing pump are adjusted according to the correction information.

[0037] It should be noted that by analyzing the differences in water quality to match the optimal dosing control strategy, the dosing accuracy is improved, and by analyzing the flow rate of the composite agent, the operating parameters of the dosing pump are dynamically adjusted to ensure that the total amount of dosing, dosing pressure, and dosing flow rate always meet the requirements.

[0038] Specifically, the water quality standards for drum boilers are based on the specific parameters of the boiler, operating conditions, and water quality characteristics. The following are water quality indicators and their standard ranges: pH value: usually controlled between 9-10. Too high or too low pH value will corrode the metal material of the boiler. The appropriate pH value helps to form a protective film on the metal surface to prevent corrosion. Boiler water conductivity: Conductivity reflects the electrolyte content in water. Generally, the conductivity is required to be less than 60μS / cm to ensure water purity and prevent corrosion and scaling problems caused by excessive electrolyte content. Phosphate: For boilers using phosphate treatment, the phosphate content is typically controlled between 2-6 mg / L. Phosphate forms soluble complexes with calcium and magnesium ions in water, preventing scale formation.

[0039] According to the different water quality difference values, match the corresponding dosing control strategy: Abnormal pH value: When the pH value is lower than the standard range, it means that the water is acidic. You can add an appropriate amount of alkaline agents, such as sodium hydroxide or sodium carbonate, to increase the pH value. If the pH value is higher than the standard range, the water is alkaline. You can add an appropriate amount of acidic agents, such as phosphoric acid or sulfuric acid, to adjust it. However, you should pay attention to controlling the amount of the agent to avoid excessive fluctuations in the pH value. Conductivity is too high: Excessive conductivity indicates excessive electrolyte content in the water, and it may be necessary to strengthen sewage treatment and adjust the dosage appropriately. If the increase in conductivity is due to excessive dosage of a certain agent, the dosage of the agent should be reduced; if it is caused by changes in the water quality, further desalination measures may be required, such as adding ion exchange resin or reverse osmosis equipment. Phosphate abnormality: If the phosphate content is lower than the standard value, scale formation may occur, and the amount of phosphate added should be appropriately increased; if the phosphate content is too high, it will not only cause waste of reagents, but may also cause phosphate hiding. At this time, the amount of phosphate added should be reduced and sewage discharge should be strengthened to reduce the phosphate content.

[0040] According to an embodiment of the present invention, obtaining the liquid level information of the dosing tank and analyzing the liquid level drop status information of the dosing tank based on the flow rate of the composite agent specifically include: Analyze the flow rate of compound medicine per unit time based on the dosing control strategy; Set an analysis time window, which includes several time nodes, recorded as the first time node, the second time node...the Nth time node; Obtain the liquid level information of the dosing tank at the first time node and the Mth time node and compare them to obtain the liquid level difference, where M is a positive integer greater than 1 and less than N; Generate information on the liquid level drop status of the dosing tank within the analysis time window based on the liquid level difference.

[0041] It should be noted that by analyzing the changes in liquid level at different time nodes, the liquid level drop status can be accurately analyzed.

[0042] According to an embodiment of the present invention, generating compound medicine replenishment information based on the liquid level drop status information of the dosing tank, and replenishing the compound medicine in the dosing tank based on the compound medicine replenishment information specifically includes: Obtain the liquid drop status information of the dosing tank and analyze the liquid level drop rate; Obtain the volume and current liquid level of the dosing tank, and calculate the total amount of the current compound agent in the dosing tank based on the volume and current liquid level of the dosing tank; The compound agent usage time is calculated based on the liquid level drop rate and the total amount of the current compound agent in the dosing tank; A replenishment time node is set based on the usage time of the compound medicine to replenish the compound medicine.

[0043] The raw materials for making the composite agent include a combination of two or more complexing agents, corrosion inhibitors, dispersants, alkalizers and defoaming agents. Unlike trisodium phosphate, which only has a single chemical reaction, the composite agent undergoes complexation, recombination and other reactions in boiler water, and there is absolutely no hidden phosphate phenomenon. The organic components have their own functions, and at the same time, the components can complement and synergize with each other. They can undergo complexation reactions with Ca2+, Mg2+, iron, copper, silicate and other ions, and can solubilize silicon and disperse iron and copper, reducing the carryover of iron and copper impurities in the steam, and will not cause steam salt.

[0044] It should be noted that in the process of replenishing the compound agent, the overall total amount of the compound agent is replenished. The compound agent is an odorless, colorless, non-toxic, alkaline liquid. It is made of organic polyamines, polycarboxylates, chelating agents, alkalizers, defoaming agents and deionized water through a process compounding process. This compound agent does not contain any phosphorus elements, so it will not have adverse effects on the environment and can reduce the environmental pressure of the production unit.

[0045] The organic compounds in the compound regulator react with Ca2+ and Mg2+ ions to form complexes, disrupting or preventing the formation of crystal buds, causing lattice distortion and increasing the salt-dissolving capacity of the boiler water. When the boiler water concentration reaches 200-300 times, it can meet or even exceed national standards, significantly reducing wastewater discharge.

[0046] The composite agent contains polar amino groups and non-polar alkyl groups, forming a hydrophobic film on the metal surface. It has the function of polyamine coating, which can effectively prevent the corrosion of corrosive media to the metal and improve the safety of boiler operation.

[0047] To ensure the water vapor quality standards and sewage discharge requirements of drum boilers, the trisodium phosphate treatment method requires testing multiple indicators such as boiler water pH value, conductivity, phosphate and boiler feed water flow rate, while the composite agent treatment used in the present invention only requires testing two indicators, namely boiler water pH value and conductivity, to meet the requirements.

[0048] The reduced discharge volume of compound chemicals simplifies drainage and improves system reliability. Regular drainage has been reduced from once per shift to once every 5-7 days, reducing operation frequency and significantly reducing the chance of valve failure. Continuous drainage has been changed from a valve opening of more than 30% to a constant minimum opening, eliminating the need for constant adjustment of valve opening.

[0049] In summary, this application combines the factory's existing DCS control system to achieve timely automatic dosing, automatic and precise control of boiler steam and water indicators, and achieve energy conservation and emission reduction in the boiler sewage system.

[0050] By utilizing the existing operator station and DCS communication, there is no need to change any hardware structure, and the implementation is quick and easy.

[0051] The user only needs to provide the Modbus address table required by the system. The existing operator station and DCS system share a local area network, and the data volume is small (estimated to be under 100 points). Standard Modbus / TCP communication is preferred, eliminating the need to install OPC software. The application software monitors the DCS communication status and, if communication is abnormal, transfers control to the DCS. To ensure boiler control and operational safety, data is not transmitted to the cloud platform.

[0052] Even if the DCS control system encounters abnormal operating conditions such as power outages, it will not affect the safe control of the boiler.

[0053] DCS control can reduce or eliminate human error in operation and ensure safe and stable operation of the boiler.

[0054] In order to better understand the present invention, the dosing scheme is further described.

[0055] Automatic control is based on the following conditions: 1. The boiler and dosing pump are controlled one-to-one. Three boilers have three independent control units. 2. Each dosing pump is operated once per hour and the flow rate needs to be calibrated in this way (generally more than 12 times); 3. The continuous blowdown of each boiler needs to be manually adjusted to a slightly open state, and the blowdown should be done once every 3 to 5 days. The appropriate degree of slight opening of the continuous blowdown valve depends on whether the boiler water and other indicators meet the requirements and establish a steady-state balance. 4. Theoretical value of dosage: For every 1 ton / hour of boiler feed water, the standard dosage is 0.01 kg; 5. Parameters of a single dosing tank: Dosing tank is 1 cubic meter, with a diameter of 1000mm, except for the tank head section; Automatic operation scheme: Input boiler instantaneous feed water variable: boiler instantaneous feed water volume t / h (0000.0); Control parameters: Dosing time per hour s; Time Mode: Each boiler can set the hourly operating time (s) and interval time (s); manually adjust the dosage, which is suitable for the boiler load to operate in a stable state (fluctuation range 85%~100%); Load operation mode: Note: Load operation mode is based on a fixed continuous pump opening; when the boiler water index and sewage discharge volume need to adjust the continuous pump opening, the dosing time needs to be adjusted at the same time.

[0056] The dosing pump flow rate of boiler No. 1 was calibrated, and the continuous pump opening was constant based on the current boiler feed water quality conditions and various index parameter requirements, and the dosing time variation range was obtained.

[0057] When the boiler feedwater flow rate fluctuates, the hourly dosing time and dosage change accordingly. Different dosing times are implemented based on the boiler load percentage. The pH and conductivity limits of the boiler water are also controlled (the rated boiler load is 150t / h).

[0058] Greater than 100% boiler rated load procedure: When the average boiler feed water volume in the previous hour is greater than 150t / h and the boiler rated load is ≧100%, the hourly dosing time is 94s.

[0059] 100%~86% boiler rated load procedure: The average boiler feed water volume in the previous hour is 130-150t / h. When 100%> boiler rated load ≧86%, the hourly dosing time is 84s.

[0060] 86%~73% boiler rated load procedure: The average boiler feed water volume in the previous hour is 110-130t / h, 85%> boiler rated load ≧73%, and the hourly dosing time is 78s.

[0061] 73%~60% boiler rated load procedure: The average boiler feed water volume in the previous hour is 90-110t / h, 73%> boiler rated load ≧ 60%, and the hourly dosing time is 68s.

[0062] 60%~53% boiler rated load procedure: The average boiler feed water volume in the previous hour is 80-90t / h, 60%> boiler rated load ≧53%, and the hourly dosing time is 64s.

[0063] 53%~46% boiler rated load program: The average boiler feed water volume in the previous hour is 70-80t / h, 53%> boiler rated load ≧46%, and the hourly dosing time is 58s.

[0064] 46%~40% boiler rated load procedure: the average boiler feed water volume in the previous hour is 60-70t / h, 46%> boiler rated load ≧40%, and the hourly dosing time is 48s.

[0065] 40%~20% boiler rated load: the average boiler feed water volume in the previous hour is 30-60t / h, 40%> boiler rated load ≧20%, and the hourly dosing time is 38s.

[0066] 20%~0% boiler rated load: If the average boiler feed water volume in the previous hour is less than 30t / h, 20%> boiler rated load ≧0%, stop adding chemicals. The boiler will be shut down at rated load.

[0067] When executing the above program, First, judge: if the average conductivity of the boiler water in the previous hour is greater than 40μS / cm, the dosing time will be halved; until the average conductivity of the boiler water in the previous hour is less than 33μS / cm, the normal dosing time will be restored. Second judgment: if the average pH value of the boiler water in the previous hour is less than 9.2, the dosing time will be increased by 50%; until the average pH value of the boiler water in the previous hour is greater than 9.3, the normal dosing time will be restored; Third judgment: If the average pH of the boiler water in the previous hour is ≥9.6, stop adding medicine in this cycle.

[0068] Please refer to Figure 3 , Figure 3 This is a block diagram of a composite reagent dosing control system for drum boiler water treatment in some embodiments of the present application. In a second aspect, embodiments of the present application provide a composite reagent dosing control system for drum boiler water treatment. The system comprises: a memory and a processor. The memory includes a program for a composite reagent dosing control method for drum boiler water treatment. When the program for the composite reagent dosing control method for drum boiler water treatment is executed by the processor, the following steps are implemented: Obtain boiler water parameter information, and analyze boiler water quality information based on the boiler water parameter information; Analyze boiler water quality information based on the DCS distributed control system and output dosing control strategy in real time; Control the operating parameters of the dosing pump and the flow rate of the compound agent based on the dosing control strategy; Obtain the liquid level information of the dosing tank and analyze the liquid level drop status information of the dosing tank based on the flow rate of the compound reagent; The compound agent replenishment information is generated based on the liquid level drop status information of the dosing tank, and the compound agent in the dosing tank is replenished based on the compound agent replenishment information.

[0069] It should be noted that this application utilizes a DCS distributed control system to automatically and timely add chemicals and precisely control boiler steam and water parameters in real time, achieving energy conservation and emission reduction in the boiler blowdown system. This application utilizes existing operator stations and DCS communication, requiring no hardware changes, making implementation quick and easy. Furthermore, the user only needs to provide the system with the Modbus address table required. The existing operator station and DCS system share a local area network, and the data volume is small (estimated to be under 100 points). Standard Modbus / TCP communication is preferred, eliminating the need for OPC software installation. The application software monitors the DCS communication status and, if communication is abnormal, transfers control to the DCS.

[0070] According to an embodiment of the present invention, obtaining boiler water parameter information and analyzing boiler water quality information based on the boiler water parameter information specifically includes: Obtain boiler water parameter information, including boiler water pH value, boiler water online conductivity and boiler feed water flow; Set water quality standard information based on drum boiler steam quality standards and blowdown requirements. The water quality standard information includes at least standard pH value, standard conductivity, and standard feed water flow rate. Compare the pH value of boiler water with the standard pH value to obtain the pH deviation rate; Compare the online conductivity of boiler water with the standard conductivity to obtain the conductivity deviation rate; Compare the boiler feed water flow rate with the standard feed water flow rate to obtain the feed water flow rate deviation rate; Analyze abnormal data of boiler water parameter information based on pH deviation rate, conductivity deviation rate and feed water flow deviation rate; The boiler water quality information is analyzed based on the abnormal data, and the boiler water quality information is evaluated according to the water quality evaluation rules to obtain the boiler water quality information.

[0071] It should be noted that by collecting real-time parameters such as the online boiler water pH value, online boiler water conductivity, boiler feed water flow, compound chemical storage tank level, and dosing flow as comprehensive input signals, and through a computer-specific logic algorithm, an output signal is formed to control the dosing pump, thereby achieving an accurate and timely dosing operation process.

[0072] According to an embodiment of the present invention, the DCS distributed control system analyzes boiler water quality information and outputs a dosing control strategy in real time, specifically including: The DCS distributed control system includes an online detection terminal, a data acquisition platform and a dosing execution unit; The online detection terminal and data acquisition platform include a frequency converter, a liquid level meter, a conductivity meter, a pH meter and a flow sensor; Obtain boiler water pH value, conductivity, water supply, steam production, and sewage discharge based on the data acquisition platform; The online detection terminal detects the pH value, conductivity, water supply, steam production, and wastewater discharge of boiler water, and analyzes boiler water quality information; Match the corresponding dosing control strategy based on boiler water quality information.

[0073] It should be noted that the application software was developed to enter evaluation indicators including but not limited to boiler water pH value, conductivity, water supply, steam production, and sewage discharge into the historical database. The next step was to clean the data, and after multiple revisions, logical thinking was formed and implanted into the factory's existing DCS control system.

[0074] Specifically, the dosing execution agencies include: Metering pump group: uses variable frequency metering pump (such as plunger pump), DCS adjusts the frequency (0~50Hz) through 4-20mA signal, with an accuracy of ±1%, and starts on demand; Chemical storage tank: equipped with liquid level sensors (ultrasonic or magnetic flaps), DCS monitors the chemical level in real time and issues early warnings; DCS adopts a multi-level hardware architecture, decomposing control functions into devices at different levels to avoid the single point of failure problem of centralized control.

[0075] The field control layer (bottom-level decentralized core) includes; Field controller (Control Station): directly connected to sensors and actuators, responsible for local data acquisition, logic control and closed-loop regulation (such as PID control). Each controller independently handles the control tasks of a specific area or process, such as temperature and pressure control of a chemical reactor. I / O module: connects to the controller to realize the input and output of analog quantities (such as temperature and flow) and digital quantities (such as switch signals), and supports hot plugging for easy maintenance; Field instruments: These include sensors (such as temperature sensors and pressure transmitters) and actuators (such as control valves and motors), which are distributed throughout the production site and interact directly with the controlled objects.

[0076] The operations monitoring layer includes; Operator Station: Engineers and operators monitor the entire system status and issue operating instructions through the graphical interface (HMI), but do not directly participate in real-time control to avoid the impact of human intervention on decentralized control. Engineer Station: Used for system configuration, programming, and maintenance. It can remotely download control programs to field controllers to achieve centralized configuration of distributed control logic.

[0077] The management team includes; Data server: collects data from each controller, stores and analyzes it, and provides decision support for production management, but does not interfere with the real-time control process.

[0078] According to an embodiment of the present invention, the operating parameters of the dosing pump and the flow rate of the compound agent are controlled based on the dosing control strategy, specifically including: Set water quality standard information based on drum boiler steam quality standards and blowdown requirements; Compare the boiler water quality information with the water quality standard information to obtain the water quality difference value; Match the corresponding dosing control strategy based on water quality difference value; Generate dosing parameters based on the dosing control strategy. The dosing parameters include the operating parameters of the dosing pump, the flow rate of the compound agent, and the total amount of the compound agent. The operating parameters of the dosing pump include the operating power, operating time, flow rate, and pressure of the dosing pump. Obtain the current flow rate of the compound medicine, compare the current flow rate with the set flow rate value, and obtain the flow rate difference; Correction information is generated based on the flow rate difference, and operating parameters of the dosing pump are adjusted according to the correction information.

[0079] It should be noted that by analyzing the differences in water quality to match the optimal dosing control strategy, the dosing accuracy is improved, and by analyzing the flow rate of the composite agent, the operating parameters of the dosing pump are dynamically adjusted to ensure that the total amount of dosing, dosing pressure, and dosing flow rate always meet the requirements.

[0080] According to an embodiment of the present invention, obtaining the liquid level information of the dosing tank and analyzing the liquid level drop status information of the dosing tank based on the flow rate of the composite agent specifically include: Analyze the flow rate of compound medicine per unit time based on the dosing control strategy; Set an analysis time window, which includes several time nodes, recorded as the first time node, the second time node...the Nth time node; Obtain the liquid level information of the dosing tank at the first time node and the Mth time node and compare them to obtain the liquid level difference, where M is a positive integer greater than 1 and less than N; Generate information on the liquid level drop status of the dosing tank within the analysis time window based on the liquid level difference.

[0081] It should be noted that by analyzing the changes in liquid level at different time nodes, the liquid level drop status can be accurately analyzed.

[0082] According to an embodiment of the present invention, generating compound medicine replenishment information based on the liquid level drop status information of the dosing tank, and replenishing the compound medicine in the dosing tank based on the compound medicine replenishment information specifically includes: Obtain the liquid drop status information of the dosing tank and analyze the liquid level drop rate; Obtain the volume and current liquid level of the dosing tank, and calculate the total amount of the current compound agent in the dosing tank based on the volume and current liquid level of the dosing tank; The compound agent usage time is calculated based on the liquid level drop rate and the total amount of the current compound agent in the dosing tank; A replenishment time node is set based on the usage time of the compound medicine to replenish the compound medicine.

[0083] The raw materials for making the composite agent include a combination of two or more complexing agents, corrosion inhibitors, dispersants, alkalizers and defoamers.

[0084] It should be noted that the compound agent is an odorless, colorless, non-toxic, alkaline liquid, which is made by compounding organic polyamines, polycarboxylates, chelating agents, alkalizers, defoaming agents and deionized water. This compound agent does not contain any phosphorus elements, so it will not have adverse effects on the environment and can reduce the environmental pressure of production units.

[0085] The organic compounds in the compound regulator react with Ca2+ and Mg2+ ions to form complexes, disrupting or preventing the formation of crystal buds, causing lattice distortion and increasing the salt-dissolving capacity of the boiler water. When the boiler water concentration reaches 200-300 times, it can meet or even exceed national standards, significantly reducing wastewater discharge.

[0086] The composite agent contains polar amino groups and non-polar alkyl groups, forming a hydrophobic film on the metal surface. It has the function of polyamine coating, which can effectively prevent the corrosion of corrosive media to the metal and improve the safety of boiler operation.

[0087] In order to ensure the water vapor quality standards and sewage discharge requirements of the drum boiler, the trisodium phosphate treatment method requires testing multiple indicators such as the pH value, conductivity, phosphate and boiler feed water flow of the boiler water, while the composite agent treatment used in the present invention only needs to test the pH value and conductivity of the boiler water to meet the requirements.

[0088] The reduced discharge volume of compound chemicals simplifies drainage and improves system reliability. Regular drainage has been reduced from once per shift to once every 5-7 days, reducing operation frequency and significantly reducing the chance of valve failure. Continuous drainage has been changed from a valve opening of more than 30% to a constant minimum opening, eliminating the need for constant adjustment of valve opening.

[0089] The third aspect of the present invention provides a computer-readable storage medium, which includes a program for a composite reagent dosing control method based on water treatment in a drum boiler. When the program for a composite reagent dosing control method based on water treatment in a drum boiler is executed by a processor, the steps of any of the above-mentioned methods for composite reagent dosing control based on water treatment in a drum boiler are implemented.

[0090] The present invention discloses a composite reagent dosing control method, system and medium based on water treatment in a drum boiler. The method obtains boiler water parameter information, analyzes boiler water quality information based on the boiler water parameter information, analyzes the boiler water quality information based on a DCS distributed control system, and outputs a dosing control strategy in real time; controls the operating parameters of a dosing pump and the flow rate of the composite reagent based on the dosing control strategy; obtains dosing tank liquid level information; generates composite reagent supplement information based on dosing tank liquid level drop status information, and supplements the composite reagent in the dosing tank based on the composite reagent supplement information; analyzes the boiler water quality information through a DCS distributed control system according to boiler water quality requirements, thereby generating a dynamic dosing control strategy, accurately controlling the dosing amount of the composite reagent and improving control accuracy; and simultaneously analyzes whether the composite reagent in the dosing tank meets the requirements during the dosing process, thereby quickly supplementing the composite reagent.

[0091] In the several embodiments provided in this application, it should be understood that the disclosed devices and methods can be implemented in other ways. The device embodiments described above are merely schematic. For example, the division of units is merely a logical function division. In actual implementation, there may be other division methods, such as: multiple units or components can be combined, or can be integrated into another system, or some features can be ignored or not executed. In addition, the coupling, direct coupling, or communication connection between the components shown or discussed can be through some interfaces, and the indirect coupling or communication connection of devices or units can be electrical, mechanical or other forms.

[0092] The units described above as separate components may or may not be physically separated, and the components displayed as units may or may not be physical units; they may be located in one place or distributed across multiple network units; some or all of the units may be selected according to actual needs to achieve the purpose of the scheme of this embodiment.

[0093] In addition, all functional units in the embodiments of the present invention may be integrated into one processing unit, or each unit may be separately used as a unit, or two or more units may be integrated into one unit; the above-mentioned integrated units may be implemented in the form of hardware or in the form of hardware plus software functional units.

[0094] Those skilled in the art will appreciate that all or part of the steps of the above-mentioned method embodiments may be implemented by hardware associated with program instructions, and the aforementioned program may be stored in a readable storage medium. When the program is executed, the program executes the steps of the above-mentioned method embodiments. The aforementioned storage medium includes various media that can store program codes, such as mobile storage devices, read-only memories (ROMs), random access memories (RAMs), magnetic disks, or optical disks.

[0095] Alternatively, if the integrated units described above are implemented as software modules and sold or used as standalone products, they can also be stored on a readable storage medium. Based on this understanding, the technical solutions of the embodiments of the present invention, or the portion that contributes to the prior art, can be embodied in the form of a software product. This software product, stored on a storage medium, includes instructions for enabling a computer device (such as a personal computer, server, or network device) to execute all or part of the methods described in the various embodiments of the present invention. The aforementioned storage media include various media capable of storing program code, such as removable storage devices, ROM, RAM, magnetic disks, or optical disks.

Claims

1. A composite agent dosing control method based on drum boiler water treatment, characterized in that: include: Obtain boiler water parameter information, and analyze boiler water quality information based on the boiler water parameter information; Analyze boiler water quality information based on the DCS distributed control system and output dosing control strategy in real time; Control the operating parameters of the dosing pump and the flow rate of the compound agent based on the dosing control strategy; Obtain the liquid level information of the dosing tank and analyze the liquid level drop status information of the dosing tank based on the flow rate of the compound reagent; The compound agent replenishment information is generated based on the liquid level drop status information of the dosing tank, and the compound agent in the dosing tank is replenished based on the compound agent replenishment information.

2. The composite agent dosing control method based on drum boiler water treatment according to claim 1 is characterized in that: Obtain boiler water parameter information and analyze boiler water quality information based on the boiler water parameter information, specifically including: Obtaining boiler water parameter information, including boiler water pH value, boiler water online conductivity, and boiler feed water flow rate; Setting water quality standard information based on drum boiler steam quality standards and blowdown requirements, wherein the water quality standard information includes at least a standard pH value, a standard conductivity, and a standard feed water flow rate; Compare the pH value of boiler water with the standard pH value to obtain the pH deviation rate; compare the online conductivity of boiler water with the standard conductivity to obtain the conductivity deviation rate; compare the boiler feed water flow rate with the standard feed water flow rate to obtain the feed water flow deviation rate; Analyze abnormal data of boiler water parameter information based on pH deviation rate, conductivity deviation rate and feed water flow deviation rate; The boiler water quality information is analyzed based on the abnormal data, and the boiler water quality information is evaluated according to the water quality evaluation rules to obtain the boiler water quality information.

3. The composite agent dosing control method based on drum boiler water treatment according to claim 2 is characterized in that: Based on the DCS distributed control system, the boiler water quality information is analyzed and the dosing control strategy is output in real time, including: The DCS distributed control system includes an online detection terminal, a data acquisition platform and a dosing execution unit; The online detection terminal and data acquisition platform include a frequency converter, a liquid level meter, a conductivity meter, a pH meter and a flow sensor; Obtain boiler water pH value, conductivity, water supply, steam production, and sewage discharge based on the data acquisition platform; The online detection terminal detects the pH value, conductivity, water supply, steam production, and wastewater discharge of boiler water, and analyzes boiler water quality information; Match the corresponding dosing control strategy based on boiler water quality information.

4. The composite agent dosing control method based on drum boiler water treatment according to claim 3 is characterized in that: Based on the dosing control strategy, the operating parameters of the dosing pump and the flow rate of the compound agent are controlled, including: Set water quality standard information based on drum boiler steam quality standards and blowdown requirements; Compare the boiler water quality information with the water quality standard information to obtain the water quality difference value; Match the corresponding dosing control strategy based on water quality difference value; Generate dosing parameters based on the dosing control strategy, the dosing parameters including the operating parameters of the dosing pump, the flow rate of the compound agent, and the total amount of the compound agent, the operating parameters of the dosing pump including the operating power, operating time, flow rate, and pressure of the dosing pump; Obtain the current flow rate of the compound medicine, compare the current flow rate with the set flow rate value, and obtain the flow rate difference; Correction information is generated based on the flow rate difference, and operating parameters of the dosing pump are adjusted according to the correction information.

5. The composite agent dosing control method based on drum boiler water treatment according to claim 4 is characterized in that: Obtain the liquid level information of the dosing tank and analyze the liquid level drop status information of the dosing tank based on the flow rate of the compound reagent, including: Analyze the flow rate of compound medicine per unit time based on the dosing control strategy; Set an analysis time window, which includes several time nodes, recorded as the first time node, the second time node...the Nth time node; Obtain the liquid level information of the dosing tank at the first time node and the Mth time node and compare them to obtain the liquid level difference, where M is a positive integer greater than 1 and less than N; Generate information on the liquid level drop status of the dosing tank within the analysis time window based on the liquid level difference.

6. The composite agent dosing control method based on drum boiler water treatment according to claim 5 is characterized in that: Generate compound agent supplement information based on the liquid level drop status information of the dosing tank, and supplement the compound agent in the dosing tank based on the compound agent supplement information, specifically including: Obtain the liquid drop status information of the dosing tank and analyze the liquid level drop rate; Obtain the volume and current liquid level of the dosing tank, and calculate the total amount of the current compound agent in the dosing tank based on the volume and current liquid level of the dosing tank; The compound agent usage time is calculated based on the liquid level drop rate and the total amount of the current compound agent in the dosing tank; Set a replenishment time node based on the usage time of the compound medicine to replenish the compound medicine; The raw materials for preparing the composite agent include a combination of two or more of a complexing agent, a corrosion inhibitor, a dispersant, an alkalizing agent and a defoaming agent.

7. A composite reagent dosing control system based on drum boiler water treatment, characterized in that: The system includes: a memory and a processor, wherein the memory includes a program of a composite reagent dosing control method based on water treatment in a drum boiler, and when the program of the composite reagent dosing control method based on water treatment in a drum boiler is executed by the processor, the following steps are implemented: Obtain boiler water parameter information, and analyze boiler water quality information based on the boiler water parameter information; Analyze boiler water quality information based on the DCS distributed control system and output dosing control strategy in real time; Control the operating parameters of the dosing pump and the flow rate of the compound agent based on the dosing control strategy; Obtain the liquid level information of the dosing tank and analyze the liquid level drop status information of the dosing tank based on the flow rate of the compound reagent; The compound agent replenishment information is generated based on the liquid level drop status information of the dosing tank, and the compound agent in the dosing tank is replenished based on the compound agent replenishment information.

8. The composite reagent dosing control system based on drum boiler water treatment according to claim 7 is characterized in that: Obtain boiler water parameter information and analyze boiler water quality information based on the boiler water parameter information, specifically including: Obtaining boiler water parameter information, including boiler water pH value, boiler water online conductivity, and boiler feed water flow rate; Setting water quality standard information based on drum boiler steam quality standards and blowdown requirements, wherein the water quality standard information includes at least a standard pH value, a standard conductivity, and a standard feed water flow rate; Compare the pH value of boiler water with the standard pH value to obtain the pH deviation rate; Compare the online conductivity of boiler water with the standard conductivity to obtain the conductivity deviation rate; Compare the boiler feed water flow rate with the standard feed water flow rate to obtain the feed water flow rate deviation rate; Analyze abnormal data of boiler water parameter information based on pH deviation rate, conductivity deviation rate and feed water flow deviation rate; The boiler water quality information is analyzed based on the abnormal data, and the boiler water quality information is evaluated according to the water quality evaluation rules to obtain the boiler water quality information.

9. The composite reagent dosing control system based on drum boiler water treatment according to claim 8 is characterized in that: Based on the DCS distributed control system, the boiler water quality information is analyzed and the dosing control strategy is output in real time, including: The DCS distributed control system includes an online detection terminal, a data acquisition platform and a dosing execution unit; The online detection terminal and data acquisition platform include a frequency converter, a liquid level meter, a conductivity meter, a pH meter and a flow sensor; Obtain boiler water pH value, conductivity, water supply, steam production, and sewage discharge based on the data acquisition platform; The online detection terminal detects the pH value, conductivity, water supply, steam production, and wastewater discharge of boiler water, and analyzes boiler water quality information; Match the corresponding dosing control strategy based on boiler water quality information.

10. A computer-readable storage medium, characterized in that The computer-readable storage medium includes a program for a composite reagent dosing control method based on water treatment in a drum boiler. When the program for a composite reagent dosing control method based on water treatment in a drum boiler is executed by a processor, the steps of the composite reagent dosing control method based on water treatment in a drum boiler as described in any one of claims 1 to 6 are implemented.

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