A wet desulfurization oxidation air regulation system and method with dual-mode verification feedback

Abstract

The present invention provides a wet desulfurization oxidation wind regulation system and method with dual-mode verification feedback, wherein the slurry storage tank is connected to the reactor through a sampling unit; the liquid storage bottle is filled with an iodine standard solution and a sodium thiosulfate standard solution, and is connected to the reactor through a hose and a precision injection pump; the reactor is plugged with a redox electrode; the host computer measures the redox potential of the solution in the reactor through the redox electrode to determine the titration end point and the amount of the consumed titration standard solution, and inverts the sulfite ion concentration in the desulfurization slurry. The host computer is also connected to a dissolved oxygen analyzer to detect the dissolved oxygen concentration in the slurry in the slurry storage tank; and mutually verifies with the sulfite ion concentration to realize dual-mode feedback control of the oxidation system. The present invention can effectively capture the complex nonlinear relationship and time dependence of each measurement parameter, and realize the accuracy of continuous automatic measurement of sulfite ions in the desulfurization slurry and ensure precision.

Description

Technical Field

[0001] The present invention belongs to the technical field of wet desulfurization, and in particular relates to a wet desulfurization oxidation air regulation system and method with dual-mode verification feedback. Background Art

[0002] At present, coal-fired thermal power units are the main source of electricity supply, and their large amount of coal-fired flue gas emissions cause harm to the ecological environment. The wet flue gas desulfurization process can effectively reduce the sulfur content of coal-fired flue gas and produce industrial by-products such as gypsum. In this process, an oxidation fan is required to provide oxidizing air for the desulfurization process to oxidize the sulfite ions in the desulfurization tower slurry to generate calcium sulfate. Deep peak regulation and wide load operation of coal-fired units have become the norm, and the supporting desulfurization and oxidation system, due to the lack of precise and effective control basis and means, the oxidation fan usually runs at full load, and it is difficult to change with the load changes of the unit, resulting in a huge waste of energy.

[0003] In the prior art, sulfite ions can be used as a direct basis for determining oxidation efficiency. The air volume of the oxidation fan can be adjusted by adjusting the concentration to maximize its efficiency. Currently, the detection of sulfite ions is mostly completed in the laboratory. The existing detection technology cannot achieve continuous measurement of sulfite in industrial production, which leads to inaccurate regulation of the oxidation air system and cannot meet the demand for wet flue gas desulfurization oxidation air regulation. Summary of the invention

[0004] The present invention provides a wet flue gas desulfurization oxidation air regulation system with dual-mode verification feedback, so as to at least solve the problems that the existing detection technology cannot realize the continuous measurement of sulfite in industrial production and the feedback control of the oxidation air system is inaccurate. At the same time, it provides technical support for the fault diagnosis of the oxidation system and the safe and energy-saving operation of the system.

[0005] The system includes: slurry storage tank, reactor, sampling unit, titration unit and host computer;

[0006] The slurry storage tank is connected to the reactor through a sampling unit, and the slurry storage tank is equipped with a dissolved oxygen analyzer;

[0007] The titration unit comprises: a first liquid storage bottle, a second liquid storage bottle, a third liquid storage bottle, a first hose, a second hose, a third hose, a first precision injection pump, a second precision injection pump, and a third precision injection pump;

[0008] The first liquid storage bottle is filled with 0.05 mol / L iodine standard solution and is connected to the reactor through a first hose and a first precision injection pump;

[0009] The second liquid storage bottle is filled with 0.05 mol / L sodium thiosulfate solution and is connected to the reactor via a second hose and a second precision injection pump;

[0010] The third liquid storage bottle is filled with 0.1 mol / L sodium thiosulfate solution and is connected to the reactor via a third hose and a third precision injection pump;

[0011] The reactor is plugged with a redox electrode;

[0012] The host computer is respectively connected to the sampling unit, the first precision injection pump, the second precision injection pump, the third precision injection pump and the redox electrode, and measures the redox potential of the solution in the reactor through the redox electrode to determine the titration endpoint and the amount of the consumed titration standard solution, and invert the sulfite ion concentration in the desulfurization slurry;

[0013] The host computer is also connected to a dissolved oxygen analyzer to detect the dissolved oxygen concentration in the slurry in the slurry storage tank; and it is mutually verified with the sulfite ion concentration to achieve dual-mode feedback control of the oxidation system.

[0014] It should be further explained that the sampling unit includes: a slurry hose and a peristaltic pump arranged on the slurry hose;

[0015] The slurry storage tank is connected to the reactor via a slurry hose;

[0016] A drain pipe is provided at the bottom of the reactor, and a first solenoid valve is installed on the drain pipe;

[0017] The first liquid storage bottle, the second liquid storage bottle, the third liquid storage bottle, the slurry storage tank and the reactor are respectively equipped with liquid level sensors; the host computer is in communication connection with the liquid level sensors.

[0018] It should be further explained that it also includes: a fourth liquid storage bottle and a syringe pump; the fourth liquid storage bottle is connected to the reactor through a protective liquid hose, and the syringe pump is arranged on the protective liquid hose;

[0019] The reactor is provided with a fixed support, on which an electric stirrer and a sprayer are installed; the sprayer is connected to municipal water via a pipeline; a first solenoid valve is arranged on the pipeline, and a second solenoid valve is connected to a host computer for communication.

[0020] The present application also provides a wet desulfurization oxidation air regulation method with dual-mode verification feedback, the method comprising:

[0021] The host computer measures the redox potential of the solution in the reactor through the redox electrode to determine the titration endpoint and the amount of titration standard solution consumed, and inverts the sulfite ion concentration in the desulfurization slurry to achieve continuous automatic measurement of sulfite ions in the desulfurization slurry;

[0022] Among them, the sulfite ions in the desulfurization slurry in the reactor are quantitatively detected by potentiometric titration;

[0023] The upper computer detects the dissolved oxygen concentration in the slurry in the slurry storage tank through a dissolved oxygen analyzer, and verifies it with the sulfite concentration to achieve dual-mode feedback control of the oxidation system;

[0024] If the sulfite value and dissolved oxygen value are within the preset threshold range, the fan opening is kept unchanged;

[0025] If the sulfite value is lower than the preset sulfite threshold and the dissolved oxygen value is higher than the preset dissolved oxygen threshold, the oxidation fan opening is controlled to be reduced;

[0026] If the sulfite value is higher than the preset sulfite threshold and the dissolved oxygen value is lower than the preset dissolved oxygen threshold, the fan opening is increased by control.

[0027] It should be further explained that the method further comprises: adding an excess of a standard iodine solution to the desulfurized slurry in the reactor, so that the standard iodine solution reacts with sulfite ions in the desulfurized slurry to oxidize the sulfite ions in the desulfurized slurry into sulfate ions;

[0028] The remaining iodine is reduced by dropping a quantitative sodium thiosulfate standard solution into the desulfurization slurry, thereby determining the consumption of the iodine standard solution and inverting the concentration of sulfite ions in the desulfurization slurry;

[0029] The sulfite ion concentration is calculated as:

[0030] C(SO3 2- )=[V(I2)C(I2)-0.5V(S2O3 2- )C(S2O3 2- )] / V

[0031] Where V represents the volume of desulfurized slurry, C(SO3 2- ) represents the molar concentration of sulfite ions in the desulfurization slurry.

[0032] It should be further explained that the method also includes:

[0033] The peristaltic pump quantitatively pumps the desulfurization slurry in the slurry storage tank into the reactor through the slurry hose;

[0034] The first precision injection pump draws excess iodine standard solution from the first liquid storage bottle and pumps it into the reactor. If the redox potential at this time is lower than the preset value, the sulfite concentration is higher than the detection upper limit;

[0035] The peristaltic pump starts to reverse and pumps the remaining slurry in the slurry hose into the slurry storage tank in reverse direction;

[0036] Control the electric stirrer to continuously stir the slurry in the reactor, and the redox electrode detects the potential indication and feeds it back to the host computer;

[0037] The second precision injection pump draws the sodium thiosulfate standard solution in the second liquid storage bottle for quantitative titration, and the second precision injection pump records the value each time it performs quantitative titration;

[0038] During the titration process, the host computer feeds back the indication of the redox electrode and the injection volume of the second precision injection pump in real time, forms a real-time correlation curve between the slurry potential and the volume of the titration solution, and outputs the first-order derivative image in the host computer;

[0039] When the injection volume of the second precision injection pump is consistent with the injection volume of the first precision injection pump, the pump stops working, and the host computer performs sulfite concentration inversion to obtain the molar concentration of sulfite in the original desulfurization slurry.

[0040] It should be further explained that the method further includes: when the peak value of the first-order derivative of the feedback is lower than the preset value, the concentration of sulfite ions in the desulfurized slurry is lower than the preset sulfite concentration detection lower limit;

[0041] Stop the second precision injection pump, open the first solenoid valve and the second solenoid valve to discharge the wastewater, and rinse the reactor;

[0042] After flushing is completed, close the solenoid valve and proceed to the next detection process;

[0043] It should be further explained that the method also includes: when the system is shut down for maintenance, the host computer controls the opening of the first solenoid valve, the second solenoid valve and the sprayer to flush the reactor. After the flushing is completed, the first solenoid valve and the second solenoid valve are closed, and the injection pump is turned on to quantitatively pump the solution in the fourth liquid storage bottle into the reactor so that the highest liquid level is higher than the detection position of the redox electrode.

[0044] It should be further explained that the method further includes: the host computer obtains the sulfite and dissolution information groups respectively, and removes abnormal values ​​of the sulfite and dissolution information groups;

[0045] Obtain the time series of historical values ​​corresponding to the sulfite and dissolution information groups, and use the long short-term memory network model to capture the dependencies and failure modes over a long period of time;

[0046] Output the sulfite and dissolution information groups to the fully connected layer of the long short-term memory network and output the prediction results;

[0047] Real-time monitoring of sulfite and dissolved oxygen information groups, and establishment of a corresponding feedback mechanism. When the sulfite and dissolved oxygen information groups are detected to exceed the preset threshold range, an alarm prompt is triggered;

[0048] The sulfite and dissolved oxygen information groups under the alarm state are also input into the preset training model. After the sulfite and dissolved oxygen information groups are predicted, the predicted results are compared with the actual results, the errors are calculated and fed back to the long short-term memory network model, and the long short-term memory network model parameters are updated.

[0049] It should be further explained that the method also includes:

[0050] Get the sulfite and dissolved oxygen information group in the system;

[0051] Constructing a sulfite and dissolved oxygen information reaction regulation knowledge graph in the sulfite and dissolved oxygen information group, and constructing a sulfite and dissolved oxygen information reaction regulation relationship data set based on the sulfite and dissolved oxygen information reaction regulation knowledge graph;

[0052] Obtain the mapping relationship between each device in the system and the sulfite and dissolved oxygen information reaction regulation relationship data set, perform data mapping and association matching processing on the sulfite and dissolved oxygen information reaction regulation relationship data set and the pre-built predicted sulfite and dissolved oxygen information group, and obtain the association relationship between the system's knowledge graph and the sulfite dissolved oxygen correlation model;

[0053] The system equipment operation data is acquired in real time, and the operation data is input into the knowledge graph and the sulfite dissolved oxygen correlation model for fault diagnosis detection and analysis, thus obtaining early warning analysis suggestions integrating the knowledge graph and the digital prediction sulfite and dissolved information group.

[0054] It can be seen from the above technical solutions that the present invention has the following advantages:

[0055] The wet desulfurization oxidation wind regulation system with dual-mode verification feedback provided by the present invention measures the redox potential of the solution in the reactor through a redox electrode, which can reflect the progress and state of the redox reaction in the solution. According to the change in the measured redox potential, the host computer can determine the titration end point, that is, when to stop adding the titration standard solution and calculate the amount of the consumed titration standard solution. In this way, the host computer can invert the concentration of sulfite ions in the desulfurization slurry and realize the continuous and automatic measurement of sulfite ions in the desulfurization slurry. The dual-mode feedback control of the oxidation fan is combined with the measurement of the dissolved oxygen concentration of the slurry, which makes up for the limitations of the current conventional detection and control methods. The present application combines the law of changes in the redox potential of the slurry, automatically titrates the desulfurization slurry and determines the titration end point, accurately inverts the concentration of sulfite ions in the slurry, and realizes the universal continuous and automatic measurement of sulfite ions in the desulfurization slurry.

[0056] For the feedback control based on dissolved oxygen concentration in the present invention, the host computer also detects the dissolved oxygen concentration in the slurry in the slurry storage tank through a dissolved oxygen analyzer. It can reflect the oxidation state in the slurry and the utilization efficiency of the oxidant. By verifying the dissolved oxygen concentration with the sulfite ion concentration, the accuracy of measurement and control can be further improved. For example, if the dissolved oxygen concentration is abnormally high, it may mean an excess of oxidant; if the dissolved oxygen concentration is abnormally low, it may mean insufficient oxidation. According to the change in dissolved oxygen concentration, the host computer can adjust the amount of oxidant added or the supply of oxidizing air accordingly to keep the oxidation state in the slurry within the optimal range.

[0057] The wet desulfurization oxidation air conditioning system with dual-mode verification feedback provided by the present invention can continuously and automatically measure the concentration of sulfite ions in the desulfurization slurry through integrated sampling, titration and measurement processes. The problem of continuous monitoring in traditional detection technology is solved, and the real-time and accuracy of monitoring are improved. A precision injection pump is used to control the amount of titration solution added, and the potential change of the solution is accurately measured in combination with a redox electrode, so as to accurately determine the titration endpoint, and based on this, the concentration of sulfite ions is inverted to achieve more precise desulfurization process control.

[0058] The system can monitor the concentration of sulfite ions and dissolved oxygen in the desulfurization slurry in real time, and can adjust the oxidation air system in real time to optimize the regulation of oxidation air volume. This helps to reduce insufficient or excessive oxidation, improve desulfurization efficiency and oxidation effect, and reduce operating costs.

[0059] The system adopts automatic control and integrated design, which reduces human intervention and errors, and improves the stability and reliability of the system. At the same time, the system can monitor and diagnose in real time, discover and deal with potential problems in time, and reduce the failure rate and maintenance costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0060] In order to more clearly illustrate the technical solution of the present invention, the accompanying drawings required for use in the description will be briefly introduced below. Obviously, the accompanying drawings in the following description are only some embodiments of the present invention. For ordinary technicians in this field, other accompanying drawings can be obtained based on these accompanying drawings without paying creative work.

[0061] Figure 1 It is a schematic diagram of a wet flue gas desulfurization oxidation air regulation system with dual-mode verification feedback;

[0062] Figure 2 The schematic diagram of an embodiment of a wet flue gas desulfurization oxidation air regulation system with dual-mode verification feedback is shown.

[0063] Description of reference numerals:

[0064] 1. Reactor; 2. Fixed bracket; 3. Sprinkler; 4. Electric stirrer; 5. Redox electrode; 6. Peristaltic pump; 7. First solenoid valve; 8. First precision injection pump; 9. Second precision injection pump; 10. Third precision injection pump; 11. Injection pump; 12. First liquid storage bottle; 13. Second liquid storage bottle; 14. Third liquid storage bottle; 15. Fourth liquid storage bottle; 16. Liquid level sensor; 17. Slurry hose; 18. First hose; 19. Second hose; 20. Third hose; 21. Second solenoid valve; 22. Host computer; 23. Protective liquid hose; 24. Drain pipe; 25. Slurry storage tank; 26. Dissolved oxygen analyzer. DETAILED DESCRIPTION

[0065] The wet desulfurization oxidation air regulation process based on dual-mode verification feedback with dual-mode verification feedback involved in this application is a comprehensive technical process, which aims to ensure the precise regulation of oxidation air in the wet desulfurization system through verification and feedback of two or more modes, thereby optimizing the desulfurization efficiency and ensuring the stable operation of the system.

[0066] For the feedback mechanism of dual-mode verification, the regulation effect of the oxidizing air in the wet flue gas desulfurization system can be evaluated and adjusted through model simulation and field measurement. The wet flue gas desulfurization oxidizing air regulation process with dual-mode verification feedback in this application can effectively reduce the errors that may be caused by a single verification method and improve the accuracy and reliability of diagnosis.

[0067] The following is a detailed description of the wet flue gas desulfurization oxidation air conditioning system with dual-mode verification feedback involved in the present application. For the purpose of explanation rather than limitation, specific details such as specific system structures and technologies are provided to facilitate a thorough understanding of the embodiments of the present application. However, it should be clear to those skilled in the art that the present application can also be implemented in other embodiments without these specific details.

[0068] It should be understood that when used in the present specification, the term "includes" indicates the presence of the described features, integral bodies, steps, operations, elements and / or components, but does not exclude the presence or addition of one or more other features, integral bodies, steps, operations, elements, components and / or their collections. The terms "include", "comprise", "have" and their variations all mean "including but not limited to", unless otherwise specifically emphasized.

[0069] It should be understood that the "one or more" mentioned in this application refers to one, two or more than two, and the "multiple" mentioned in this application refers to two or more. In the description of this application, unless otherwise specified, " / " means or, for example, A / B can mean A or B. The "and / or" in this article is just a way to describe the association relationship of associated objects, indicating that there can be three relationships. For example, A and / or B can mean: A exists alone, A and B exist at the same time, and B exists alone.

[0070] In order to clearly describe the technical solution of the present application, the words "first", "second" and the like are used to distinguish the same or similar items with substantially the same functions and effects. Those skilled in the art can understand that the words "first", "second" and the like do not limit the quantity and execution order, and the words "first", "second" and the like do not necessarily limit the difference.

[0071] The phrases such as "one embodiment" or "some embodiments" described in the present application mean that the specific features, structures or characteristics described in the embodiment are included in one or more embodiments of the present application. Therefore, the phrases such as "in one embodiment", "in some embodiments", "in some other embodiments", "in some other embodiments" etc. that appear in different places in the present application do not necessarily refer to the same embodiment, but mean "one or more but not all embodiments", unless otherwise specifically emphasized in other ways.

[0072] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0073] See also Figures 1 to 2 The figure shows a schematic diagram of a wet flue gas desulfurization oxidation air conditioning system with dual-mode verification feedback in a specific embodiment. The system includes: a slurry storage tank 25, a reactor 1, a sampling unit, a titration unit, a fourth liquid storage bottle 15, an injection pump 11 and a host computer.

[0074] This embodiment is attached Figure 1 The sampling unit, the titration unit and the redox electrode constitute the sulfite detection module.

[0075] In some embodiments, the slurry storage tank 25 is connected to the reactor (1) via a sampling unit, and a dissolved oxygen analyzer 26 is installed in the slurry storage tank; the slurry storage tank 25 is connected to the reactor 1 via a sampling unit. The reactor is encapsulated in a shell and filled with nitrogen for anti-oxidation protection.

[0076] The sampling unit includes: a slurry hose 17 and a peristaltic pump 6 disposed on the slurry hose 17; the slurry storage tank 25 is connected to the reactor 1 through the slurry hose 17. The slurry in the slurry storage tank can be pumped into the reactor 1 through the peristaltic pump 6. The peristaltic pump has forward and reverse functions.

[0077] In some embodiments, the titration unit includes: a first liquid storage bottle 12 , a second liquid storage bottle 13 , a third liquid storage bottle 14 , a first hose 18 , a second hose 19 , a third hose 20 , a first precision injection pump 8 , a second precision injection pump 9 , and a third precision injection pump 10 .

[0078] Specifically, the first liquid storage bottle 12 is filled with a 0.05 mol / L iodine standard solution and is connected to the reactor 1 via a first hose 18 and a first precision injection pump 8. The second liquid storage bottle 13 is filled with a 0.05 mol / L sodium thiosulfate solution and is connected to the reactor 1 via a second hose 19 and a second precision injection pump 9; the third liquid storage bottle 14 is filled with a 0.1 mol / L sodium thiosulfate solution and is connected to the reactor 1 via a third hose 20 and a third precision injection pump 10.

[0079] A drain pipe 24 is provided at the bottom of the reactor 1, and a first solenoid valve 7 is installed on the drain pipe 24; the first liquid storage bottle 12, the second liquid storage bottle 13, the third liquid storage bottle 14, the slurry storage tank and the reactor 1 are respectively installed with liquid level sensors 16; the upper computer is communicatively connected with the liquid level sensor 16, and the liquid level information of the first liquid storage bottle 12, the second liquid storage bottle 13, the third liquid storage bottle 14, the slurry storage tank and the reactor 1 can be obtained.

[0080] The reactor 1 of this embodiment is connected with a redox electrode 5 .

[0081] In some embodiments, the fourth liquid storage bottle 15 is connected to the reactor 1 through a protective liquid hose 23, and the injection pump 11 is arranged on the protective liquid hose 23; the reactor 1 is installed with a fixed bracket 2, and the fixed bracket 2 is installed with an electric stirrer 4 and a sprayer 3; the sprayer 3 is connected to municipal water through a pipeline; the spraying position of the sprayer is lower than the outlet position of each hose. A first solenoid valve 7 is arranged on the pipeline, and a second solenoid valve 21 is connected to the host computer for communication.

[0082] For this embodiment, the host computer is respectively connected to the sampling unit, the first precision injection pump 8, the second precision injection pump 9, the third precision injection pump 10 and the redox electrode 5, and the redox potential of the solution in the reactor is measured by the redox electrode 5 to determine the titration end point and the amount of the consumed titration standard solution, and to invert the sulfite ion concentration in the desulfurization slurry to achieve continuous automatic measurement of sulfite ions in the desulfurization slurry. At the same time, the host computer detects the dissolved oxygen concentration in the slurry in the slurry storage tank through a dissolved oxygen analyzer, and verifies it with the sulfite concentration to achieve dual-mode feedback control of the oxidation system.

[0083] The dual-mode feedback control of this embodiment uses both the redox potential and the dissolved oxygen concentration as feedback control parameters to achieve precise control of the desulfurization oxidation system.

[0084] Specifically, the process and state of the redox reaction in the solution can be reflected by measuring the redox potential of the solution in the reactor through the redox electrode 5. According to the change of the measured redox potential, the host computer can determine the titration end point, that is, when to stop adding the titration standard solution and calculate the amount of the consumed titration standard solution. In this way, the host computer can invert the concentration of sulfite ions in the desulfurized slurry.

[0085] In this embodiment, based on the concentration of sulfite ions, the host computer can adjust the amount of desulfurization oxidant added or the amount of oxidizing air supplied to maintain the sulfite ions in the desulfurization slurry within a suitable concentration range, thereby optimizing the desulfurization effect.

[0086] For feedback control based on dissolved oxygen concentration, the host computer also detects the dissolved oxygen concentration in the slurry in the slurry storage tank through a dissolved oxygen analyzer. It can reflect the oxidation state in the slurry and the utilization efficiency of the oxidant. By verifying the dissolved oxygen concentration with the sulfite ion concentration, the accuracy of measurement and control can be further improved. For example, if the dissolved oxygen concentration is abnormally high, it may mean an excess of oxidant; if the dissolved oxygen concentration is abnormally low, it may mean insufficient oxidation. According to the change in dissolved oxygen concentration, the host computer can adjust the amount of oxidant added or the supply of oxidizing air accordingly to keep the oxidation state in the slurry within the optimal range.

[0087] According to the embodiment of the present application, in addition to receiving sulfite concentration and dissolved oxygen value, the host computer also collects the flue gas parameters at the inlet and outlet of the desulfurization tower, the desulfurization circulating slurry parameters and the oxidation fan operating parameters, and respectively establishes the correlation model between sulfite / dissolved oxygen and these parameters through the deep learning algorithm. The model predicts the data to assist the online measured data, regulates the oxidation fan and evaluates the operating performance of the oxidation system. Moreover, the sulfite concentration and the dissolved oxygen value are mutually verified to ensure the accuracy of the regulation.

[0088] In some specific embodiments, the quantitative desulfurization slurry is pumped from the slurry storage tank into the reactor. The titration unit has an iodine (I2) standard solution storage bottle and a sodium thiosulfate (Na2S2O4) standard solution storage bottle and its matching precision injection pump and a hose interconnected therewith, which can quantitatively pump the standard solution into the reactor to realize the titration process.

[0089] The redox electrode can measure the redox potential of the solution in the reactor, so that the host computer can determine the titration endpoint and the amount of titration standard solution consumed.

[0090] The system of this embodiment also has a fixed bracket, an electric stirrer, a liquid level sensor, a 3 mol / L potassium chloride standard solution and an injection pump, a solenoid valve and a sprinkler for controlling the discharge of clean water for flushing and waste liquid, and its connecting pipes.

[0091] The first solenoid valve is connected to the flushing water and the sprayer for washing the reactor, and the second solenoid valve is located at the bottom of the reactor to control the discharge of reaction wastewater. The fixed bracket is located above the reactor and connected to the bottom of the reactor to fix the redox electrode, the hose connected to each pump, the electric stirrer and the sprayer.

[0092] The blades of the electric stirrer of this embodiment are located inside the reactor to provide power to prevent the slurry particles from settling and to increase the reaction rate. The liquid level sensor is installed at the bottom of the liquid storage bottle to provide feedback on the liquid level in the liquid storage bottle.

[0093] The 3 mol / L potassium chloride standard solution of this embodiment provides protection liquid for the redox electrode through the injection pump connected to the protection liquid hose. When the system is shut down or maintained, the 3 mol / L potassium chloride standard solution is pumped into the reactor to protect and activate the electrode.

[0094] The detection probe of the redox electrode is located at the bottom of the slurry storage tank, which can continuously monitor the dissolved oxygen content of the slurry. The host computer can receive the continuously detected sulfite concentration and the real-time monitored slurry dissolved oxygen value, and after processing and judging, adopt the corresponding feedback mechanism to output the oxidation fan control signal and fault diagnosis signal.

[0095] The host computer involved in the present application is intended to represent various forms of digital computers, such as laptop computers, desktop computers, workbenches, personal digital assistants, servers, blade servers, mainframe computers, and other suitable computers. Electronic devices can also represent various forms of mobile devices, such as personal digital processing and other similar computing devices. The components shown herein, their connections and relationships, and their functions are only used as examples, and are not intended to limit the implementation of the embodiments of the present application described and / or required herein.

[0096] The host computer supports wireless Internet access. The wireless Internet access technologies involved may include wireless local area networks (Wi-Fi, WLAN, Wireless Local Area Networks), wireless broadband (Wibro), Worldwide Interoperability for Microwave Access (Wimax), High Speed ​​Downlink Packet Access (HSDPA, High Speed ​​Downlink Packet Access), etc.

[0097] The following is an embodiment of a wet desulfurization oxidation wind regulation method with dual-mode verification feedback provided in an embodiment of the present disclosure. This method and the wet desulfurization oxidation wind regulation system with dual-mode verification feedback in the above-mentioned embodiments belong to the same inventive concept. For details not fully described in the embodiment of the wet desulfurization oxidation wind regulation method with dual-mode verification feedback, please refer to the above-mentioned embodiment of the wet desulfurization oxidation wind regulation system with dual-mode verification feedback.

[0098] Methods include:

[0099] The host computer measures the redox potential of the solution in the reactor through the redox electrode to determine the titration endpoint and the amount of titration standard solution consumed, and inverts the sulfite ion concentration in the desulfurization slurry to achieve continuous automatic measurement of sulfite ions in the desulfurization slurry;

[0100] Among them, the sulfite ions in the desulfurization slurry in the reactor are quantitatively detected by potentiometric titration to meet the requirements of quantitative detection;

[0101] The upper computer tests the dissolved oxygen concentration in the slurry through a dissolved oxygen analyzer, and verifies it with the sulfite concentration to ensure the accuracy of the regulation;

[0102] If the sulfite value and dissolved oxygen value are within the preset threshold range, the fan opening is kept unchanged;

[0103] If the sulfite value is lower than the preset sulfite threshold and the dissolved oxygen value is higher than the preset dissolved oxygen threshold, the oxidation fan opening is controlled to be reduced;

[0104] If the sulfite value is higher than the preset sulfite threshold and the dissolved oxygen value is lower than the preset dissolved oxygen threshold, the fan opening is increased by control.

[0105] It should be understood that the order of execution of the steps in the above embodiment does not necessarily mean the order of execution. The execution order of each process should be determined by its function and internal logic, and should not constitute any limitation on the implementation process of the embodiment of the present invention.

[0106] Further, as a refinement and extension of the specific implementation of the above embodiment, in order to fully illustrate the specific implementation process in this embodiment, the following provides a specific implementation process of the wet desulfurization oxidation air adjustment method with dual-mode verification feedback, which specifically includes the following steps:

[0107] In some embodiments, the system detects sulfite ions in the desulfurized slurry based on the residual iodine method. The system drips an excess of iodine standard solution into the desulfurized slurry to react with the sulfite ions in the solution and oxidize them into sulfate ions. The remaining iodine is reduced by dripping a quantitative sodium thiosulfate standard solution into the slurry, thereby determining the consumption of the iodine standard solution and inverting the concentration of sulfite ions in the desulfurized slurry.

[0108] Among them, the main ion reaction equations involved are:

[0109] I2+SO3 2- +H2O==SO4 2- +2H + +2I -

[0110] 2S2O3 2- +I2==S4O6 2- +2I -

[0111] According to the above formula, the concentration of sulfite ions can be obtained as:

[0112] C(SO3 2- )=[V(I2)C(I2)-0.5V(S2O3 2- )C(S2O3 2- )] / V(Slurry)

[0113] Where V represents the volume of desulfurized slurry, C(SO3 2- ) represents the molar concentration of sulfite ions in the desulfurization slurry, S2O3 2- Represents thiosulfate ion, S4O6 2- represents tetrathiosulfate ion, I2 represents a molecule formed by two iodine atoms covalently bonded together, SO3 2- It means that a sulfurous acid molecule (SO3) gains two electrons and forms an ion with two negative charges.

[0114] H2O represents water molecules, SO4 2- It means that a sulfuric acid molecule gains two electrons and forms an ion with two negative charges, H + represents hydrogen ion, I - It represents a negatively charged ion formed when an iodine atom gains an electron.

[0115] The titration endpoint determination method of the present embodiment comprises the following steps:

[0116] The titration amount is controlled by the change of the redox potential value.

[0117] Considering that the only strongly reducing substance in the desulfurization slurry is sulfite ion, the redox potential will increase rapidly when an excess of iodine standard solution is added.

[0118] In this embodiment, a sodium thiosulfate standard solution is added dropwise to read the redox electrode indication.

[0119] When the solution transitions from strong oxidizing to strong reducing, the redox potential will jump. The sulfite concentration can be inverted according to the above formula by capturing the volume of sodium thiosulfate solution added when the potential jumps.

[0120] In some embodiments, the system is under normal working conditions, and the normal working process is controlled by the host computer. The peristaltic pump 6 quantitatively pumps the desulfurized slurry in the slurry storage tank into the reactor 1 through the slurry hose 17, and then the first precision injection pump 8 extracts the excess iodine standard solution in the first liquid storage bottle 12 and pumps it into the reactor 1. The amount of excess iodine standard solution can be quantitatively set according to the actual working conditions.

[0121] The peristaltic pump 6 of this embodiment starts to reverse and pumps the residual slurry in the slurry hose 17 into the slurry storage tank in reverse. At the same time, the electric stirrer 4 is controlled to work to continuously stir the slurry in the reactor 1, and the upper computer records the potential indication through the redox electrode 5.

[0122] Subsequently, the second precision injection pump 9 extracts the sodium thiosulfate standard solution in the second liquid storage bottle 13 for quantitative titration. Each time the second precision injection pump 9 performs quantitative titration, the host computer 22 records the value.

[0123] During the titration process, the host computer 22 provides real-time feedback of the indication of the redox electrode 5 and the injection volume of the second precision injection pump 9 to form a real-time correlation curve between the slurry potential and the volume of the titration solution, and outputs its first-order derivative image in the host computer 22 .

[0124] When the injection volume of the second precision injection pump 9 is consistent with the injection volume of the first precision injection pump 8, the operation stops, and the host computer 22 performs sulfite concentration inversion according to the above titration principle and titration end point determination method to obtain the molar concentration of sulfite in the original desulfurization slurry. After the measurement process is completed, the host computer 22 controls the second solenoid valve 21 and the first solenoid valve 7 to open to discharge the waste liquid, and opens the sprayer 3 to flush the reactor 1. After the flushing is completed, the host computer 22 controls the second solenoid valve 21 and the first solenoid valve 7 to close, and the peristaltic pump 6 is turned on again to perform the next cycle detection.

[0125] In some specific embodiments, due to various factors, the concentration of sulfite ions in the desulfurized slurry increases. When the value fed back to the host computer 22 by the redox electrode 5 is lower than the set threshold value under normal operation, it indicates that the concentration of sulfite ions in the desulfurized slurry increases.

[0126] At this time, the host computer 22 stops the operation of the second precision injection pump, opens the first solenoid valve 7 and the second solenoid valve 21 to discharge the waste water, and flushes the reactor 1.

[0127] After flushing is completed, close the first solenoid valve 7 and the second solenoid valve 21. Turn on the peristaltic pump 6, and the desulfurization slurry in the liquid storage tank is quantitatively pumped into the reactor 1 through the slurry hose 17. Then the first precision injection pump 8 extracts the excess iodine standard solution in the first liquid storage bottle 12 and pumps it into the reactor 1. The amount of excess iodine standard solution here can be quantitatively set according to the actual working conditions.

[0128] At the same time, the peristaltic pump 6 starts to reverse and pumps the residual slurry in the slurry hose 17 into the slurry storage tank in the reverse direction. At this time, the electric stirrer 4 works to continuously stir the slurry in the reactor 1, and the redox electrode 5 records the potential indication and feeds it back to the host computer 22. Subsequently, the third precision injection pump 10 extracts the sodium thiosulfate standard solution in the third liquid storage bottle 14 for quantitative titration. Each time the third precision injection pump 10 performs a quantitative titration, the host computer 22 records the value.

[0129] During the titration process, the host computer 22 feeds back the indication of the redox electrode 5 and the injection volume of the third precision injection pump 10 in real time, forms a real-time correlation curve between the slurry potential and the volume of the titration solution, and outputs its first-order derivative image in the host computer 22. The subsequent process is the same as that under the above-mentioned normal working condition.

[0130] This embodiment also involves maintenance conditions, and specific operating steps include: continuous operation of the system will consume the standard solutions in the first liquid storage bottle, the second liquid storage bottle and the third liquid storage bottle. When the remaining amount of solution is small, the liquid level sensor 16 transmits a signal to the host computer 22 to remind you to add the corresponding standard solution.

[0131] When the system needs to be shut down for maintenance, the host computer 22 shuts down the sampling unit, the titration unit, the measurement unit and the feedback unit. The first solenoid valve 7, the second solenoid valve 21 and the sprayer 3 are opened to flush the reactor 1. After the flushing is completed, the first solenoid valve 7 and the second solenoid valve 21 are closed, and the injection pump 11 is opened to quantitatively pump the solution in the fourth liquid storage bottle 15 into the reactor 1 so that the highest point of the liquid level is higher than the detection probe of the redox electrode 5.

[0132] In one embodiment of the present invention, based on the above-mentioned wet desulfurization oxidation wind regulation method with dual-mode verification feedback, the training method and steps of the large model of the correlation between the sulfite value and the dissolved oxygen value of the desulfurization slurry will be given below. The following is a possible example of the method and steps to provide a non-limiting explanation of its specific implementation plan.

[0133] In this embodiment, the values ​​of the sulfite detection module and the dissolved oxygen value detection module are collected by the host computer, and abnormal values ​​are removed for standardization.

[0134] In some embodiments, a time series of historical values ​​is obtained, and a long short-term memory network model is used to capture dependencies and failure modes over a long period of time. The data is output to a fully connected layer of the long short-term memory network, and a prediction result is output.

[0135] In this embodiment, the trained model is deployed to the host computer to monitor the sulfite value and dissolved oxygen value in real time. A corresponding feedback mechanism is established. When the model detects that the sulfite value and dissolved oxygen value increase or decrease at the same time, an alarm is triggered and the program is automatically adjusted. The data is fed back to the central processor to further train the model, forming an adaptive learning system.

[0136] The model of this embodiment can predict new data, compare the predicted results with the actual results, calculate the error and feed it back to the model, and update the model parameters. The model is regularly updated through the incremental learning method, so that the model can adapt to new working conditions or equipment changes, and improve the stability and accuracy of the system.

[0137] The following are the training methods and steps for the multi-parameter prediction deep regulation correlation model.

[0138] This embodiment can also collect the flue gas parameters at the inlet and outlet of the desulfurization tower, the desulfurization circulating slurry parameters, the oxidation fan operation parameters, the sulfite detection module and the dissolved oxygen value through various sensors.

[0139] The flue gas parameters of this embodiment include but are not limited to temperature, pressure, SO2 concentration, flue gas flow rate, etc.

[0140] Desulfurization circulating slurry parameters include but are not limited to pH value, temperature, liquid level, slurry flow rate, etc.

[0141] The operating parameters of the oxidation fan include but are not limited to fan speed, air volume, pressure, operating time, etc.

[0142] This embodiment cleans the above data, processes outliers and missing values, and performs standardization. The time series characteristics of the above data are extracted, considering the change rate and volatility of different parameters, as well as the average value and peak value in different time intervals.

[0143] This embodiment uses decision tree features to screen the features that have the greatest impact on sulfite concentration and dissolved oxygen value. The data is trained using a long short-term memory network combined with a convolutional neural network combined model.

[0144] The specific performance of this embodiment is that the long short-term memory network captures the changing trend of each parameter in the time dimension and its influence on the sulfite value and the dissolved oxygen value, combines with the convolutional neural network to extract complex spatiotemporal characteristics, and then performs time series analysis through the long short-term memory network to capture the long-term dependency of the data.

[0145] The above output is processed by the fully connected layer to generate the prediction results of sulfite concentration and dissolved oxygen value. The trained model is deployed in the feedback processing module to realize online real-time prediction of sulfite concentration and dissolved oxygen value. The prediction results are used to control the air volume of the oxidation fan in real time to optimize the operating efficiency of the desulfurization system. The model is continuously updated and optimized through incremental learning to adapt to new working conditions and new environmental changes.

[0146] According to yet another embodiment of the present invention, S201: obtaining a sulfite and dissolution information group in the system.

[0147] The sulfite and dissolved information group includes the values ​​collected by the sulfite detection module and the dissolved oxygen value detection module. It can also include: flue gas parameters, desulfurization circulating slurry parameters and oxidation fan operation parameters.

[0148] The host computer adopts a distributed data acquisition method, which can collect sulfite and dissolved oxygen information groups in real time based on multiple protocols such as HTTP, TCP, UDP, etc., and store the sulfite and dissolved oxygen information groups in different types of databases such as time series, real-time, relational, and object storage.

[0149] In this embodiment, the host computer supports online remote signaling, remote measurement, and remote pulse data of the sampling unit, the first precision injection pump, the second precision injection pump, the third precision injection pump, and the redox electrode, and uses the HTTP protocol to access the data communication method.

[0150] S202: construct a sulfite and dissolved oxygen information reaction regulation knowledge graph in the sulfite and dissolved oxygen information group, and construct a sulfite and dissolved oxygen information reaction regulation relationship data set based on the sulfite and dissolved oxygen information reaction regulation knowledge graph.

[0151] This embodiment is based on the operating process of the wet desulfurization oxidation wind regulation method with dual-mode verification feedback. According to the wet desulfurization oxidation wind regulation process, a sulfite and dissolved oxygen information reaction regulation knowledge graph is constructed to realize the operation of related processes such as the titration endpoint determination process and the sulfite detection process.

[0152] Specifically, step S202 also includes the following steps: obtaining real-time reaction status data of each device in the system, current sulfite detection information and titration information, and constructing a wet flue gas desulfurization oxidation wind regulation node with dual-mode verification feedback based on the operating relationship between the real-time reaction status data, current sulfite detection information and titration information.

[0153] Specifically, the real-time operating status data of each device in the system is obtained through the data governance middle platform, and the sulfite and dissolved information reaction regulation knowledge graph in the sulfite and dissolved oxygen information reaction regulation relationship data set of each device in the system is combined to obtain the node operation relationship between the equipment operation nodes in the current operating state, and use each equipment operation node as a wet flue gas desulfurization oxidation wind regulation node with dual-mode verification feedback, and use the node operation relationship or attribute as the connecting edge, so that the equipment operation nodes and operation relationships related to the current operation scenario are networked in the form of points and edges, and a wet flue gas desulfurization oxidation wind regulation node with dual-mode verification feedback is obtained.

[0154] In some embodiments, the wet flue gas desulfurization oxidation wind regulation node with dual-mode verification feedback is combined with the sulfite and dissolved oxygen information reaction regulation knowledge graph in the sulfite and dissolved oxygen information reaction regulation relationship data set to perform data composite processing, and the current operating scenarios of each device in the system are optimized to obtain the sulfite and dissolved oxygen information reaction regulation relationship data set of the optimized system.

[0155] In this embodiment, the relationship extraction model is a relationship extraction model of a bidirectional long short-term memory network and an attention mechanism. The relationship extraction model is used to perform data learning and data training on data based on the adjustment diagnosis knowledge base data of each device in the system to obtain data information related to the adjustment diagnosis of each device in the system, and local adjustment diagnosis features in the data information related to the adjustment diagnosis are extracted through the PCNN layer, thereby obtaining the adjustment diagnosis feature connection of each device in the system.

[0156] In some embodiments, according to the adjustment diagnosis feature connection, the corresponding equipment is weighted and a node operation relationship with weight is obtained.

[0157] In some embodiments, the association relationship between the configuration node operation relationship and the sulfite and dissolved oxygen information reaction regulation knowledge graph is performed, and the sulfite and dissolved oxygen information group is subjected to label classification processing to obtain the label classification result of the sulfite and dissolved oxygen information group.

[0158] S203: Obtain the mapping relationship between each device in the system and the sulfite and dissolved oxygen information reaction regulation relationship data set, perform data mapping and association matching processing on the sulfite and dissolved oxygen information reaction regulation relationship data set and the pre-built predicted sulfite and dissolved oxygen information group, and obtain the association relationship between the system's knowledge graph and the sulfite dissolved oxygen correlation model.

[0159] Specifically, it also includes: according to the mapping relationship between each device in the system and the sulfite and dissolved oxygen information reaction regulation relationship data set, the equipment map data related to the mapping relationship is obtained from the reactor 1 knowledge map, and the identifier association matching processing is performed with the pre-built predicted sulfite and dissolved oxygen information group.

[0160] In some embodiments, based on the mapping relationship between the equipment in the system and the sulfite and dissolved oxygen information reaction regulation relationship data set, the mutual correspondence between the objects and relationships of the knowledge graph nodes and the associated relationships in the predicted sulfite and dissolved oxygen information group is determined, and the data to be mapped is extracted from the sulfite and dissolved oxygen information reaction regulation knowledge graph, and data mapping is performed with the sulfite and dissolved oxygen information reaction regulation relationship data set in the predicted sulfite and dissolved oxygen information group, and identifier association matching processing is performed based on the identifiers of the sulfite and dissolved oxygen information reaction regulation relationship data set and the mapping data.

[0161] In some embodiments, data mapping processing is performed on the sulfite and dissolved oxygen information reaction regulation relationship data set and the predicted sulfite and dissolved oxygen information group according to the identifier association relationship to obtain a knowledge graph and a sulfite dissolved oxygen correlation model.

[0162] Specifically, according to the identifier association relationship, the sulfite and dissolved oxygen information reaction regulation relationship data set is data mapped with the predicted sulfite and dissolved oxygen information group, the device node is mapped with the device sulfite and dissolved oxygen information reaction regulation relationship data set, and the attribute data and connection relationship related to the device node are data mapped with the sulfite and dissolved oxygen information reaction regulation relationship data set, thereby obtaining the system's knowledge graph and sulfite dissolved oxygen correlation model.

[0163] For example, the operating temperature of the reactor may be an attribute value in the knowledge graph, but it is a real-time monitoring data point in the sulfite and dissolved oxygen information reaction regulation relationship dataset, thereby mapping the device node and the sulfite and dissolved oxygen information reaction regulation relationship dataset.

[0164] S204: Acquire system equipment operation data in real time, input the operation data into the knowledge graph and sulfite dissolved oxygen correlation model for fault diagnosis detection and analysis, and obtain early warning analysis suggestions that integrate the knowledge graph and digital prediction sulfite and dissolved oxygen information group.

[0165] Specifically, in the process of adjustment diagnosis and analysis, the diagnosis prediction conclusion is fused with the knowledge graph, and the current fault diagnosis prediction conclusion is verified by combining the equipment node attribute data and node association relationships in the knowledge graph, so as to obtain adjustment diagnosis suggestions for the fused graph and digitally predicted sulfite and dissolved oxygen information group.

[0166] It should be understood that when an element or layer is referred to as being "on", "connected" or "coupled" to another element or layer, it may be directly on, directly connected or coupled to the other element or layer, or there may be intermediate elements or layers. Conversely, when an element is referred to as being "directly on", "directly connected" or "directly coupled" to another element or layer, there are no intermediate elements or layers. Similar numbers in all figures indicate similar elements. As used herein, the term "and / or" includes any and all combinations of one or more of the relevant listed items.

[0167] Spatially relative terms may be used for ease of description, such as "under," "below," "lower," "above," "above," etc. to describe the relationship of one element or feature to another element or feature as shown in the figure. It should be understood that the spatially relative terms are intended to include different orientations of the device in use or operation other than the orientation shown in the figure. For example, if the device in the figure is turned over, the elements described as "under" or "below" other elements or features will be facing "above" the other elements or features. Thus, the exemplary term "below" can include both the above and below orientations. The device can be made to take other orientations (rotated 90 degrees or other orientations), and the spatially relative terms used here are interpreted accordingly.

[0168] The terms used herein are used only to describe specific embodiments and are not intended to limit the statements in this document. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms unless the context clearly indicates otherwise. It is also understood that when used in this specification, the term "comprising" refers to the presence of the features, integers, steps, operations, elements and / or components, but does not exclude the presence or addition of one or more other features, integers, steps, operations, elements, components and / or combinations thereof.

[0169] The above description of the disclosed embodiments enables one skilled in the art to implement or use the present invention. Various modifications to these embodiments will be apparent to one skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention will not be limited to the embodiments shown herein, but rather to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A wet flue gas desulfurization oxidation air regulation method with dual-mode verification feedback, characterized in that: Methods include: The host computer measures the redox potential of the solution in the reactor through the redox electrode to determine the titration endpoint and the amount of titration standard solution consumed, and inverts the sulfite ion concentration in the desulfurization slurry to achieve continuous automatic measurement of sulfite ions in the desulfurization slurry; Among them, the sulfite ions in the desulfurization slurry in the reactor are quantitatively detected by potentiometric titration; The upper computer detects the dissolved oxygen concentration in the slurry in the slurry storage tank through a dissolved oxygen analyzer, and verifies it with the sulfite concentration to achieve dual-mode feedback control of the oxidation system; If the sulfite value and dissolved oxygen value are within the preset threshold range, the fan opening is kept unchanged; If the sulfite value is lower than the preset sulfite threshold and the dissolved oxygen value is higher than the preset dissolved oxygen threshold, the oxidation fan opening is controlled to be reduced; If the sulfite value is higher than the preset sulfite threshold and the dissolved oxygen value is lower than the preset dissolved oxygen threshold, the fan opening is increased by control; The method also includes: The peristaltic pump quantitatively pumps the desulfurization slurry in the slurry storage tank into the reactor through the slurry hose; The first precision injection pump draws excess iodine standard solution from the first liquid storage bottle and pumps it into the reactor; The peristaltic pump starts to reverse and pumps the remaining slurry in the slurry hose into the slurry storage tank in reverse direction; Control the electric stirrer to continuously stir the slurry in the reactor, and the redox electrode detects the potential indication and feeds it back to the host computer; The second precision injection pump draws the sodium thiosulfate standard solution in the second liquid storage bottle for quantitative titration, and the second precision injection pump records the value each time it performs quantitative titration; During the titration process, the host computer feeds back the indication of the redox electrode and the injection volume of the second precision injection pump in real time, forms a real-time correlation curve between the slurry potential and the volume of the titration solution, and outputs the first-order derivative image in the host computer; When the second precision injection pump stops working, the host computer performs sulfite concentration inversion to obtain the sulfite molar concentration in the original desulfurization slurry; The host computer obtains the sulfite and dissolved oxygen information groups respectively, and removes abnormal values ​​of the sulfite and dissolved oxygen information groups; Obtain the time series of historical values ​​corresponding to the sulfite and dissolved oxygen information groups, and use the long short-term memory network model to capture the dependencies and failure modes over a long period of time; The sulfite and dissolved oxygen information groups are output to the fully connected layer of the long short-term memory network to output the prediction results.

2. The wet flue gas desulfurization oxidation air regulation method with dual-mode verification feedback according to claim 1 is characterized in that: The method is implemented based on a wet desulfurization oxidation air regulation system with dual-mode verification feedback, the wet desulfurization oxidation air regulation system comprising: a slurry storage tank, a reactor (1), a sampling unit, a fourth liquid storage bottle (15), an injection pump (11), a titration unit and a host computer; The slurry storage tank is connected to the reactor (1) via a sampling unit, and the slurry storage tank is equipped with a dissolved oxygen analyzer (26); The titration unit comprises: a first liquid storage bottle (12), a second liquid storage bottle (13), a third liquid storage bottle (14), a first hose (18), a second hose (19), a third hose (20), a first precision injection pump (8), a second precision injection pump (9), and a third precision injection pump (10); The first liquid storage bottle (12) is filled with a 0.05 mol / L iodine standard solution and is connected to the reactor (1) via a first hose (18) and a first precision injection pump (8); The second liquid storage bottle (13) is filled with a 0.05 mol / L sodium thiosulfate solution and is connected to the reactor (1) via a second hose (19) and a second precision injection pump (9); The third liquid storage bottle (14) is filled with a 0.1 mol / L sodium thiosulfate solution and is connected to the reactor (1) via a third hose (20) and a third precision injection pump (10); The reactor (1) is plugged with a redox electrode (5); The host computer is respectively connected to the sampling unit, the first precision injection pump (8), the second precision injection pump (9), the third precision injection pump (10) and the redox electrode (5), and measures the redox potential of the solution in the reactor through the redox electrode (5) to determine the titration endpoint and the amount of the consumed titration standard solution, and invert the sulfite ion concentration in the desulfurization slurry; The host computer is also connected to a dissolved oxygen analyzer (26) to detect the dissolved oxygen concentration in the slurry in the slurry storage tank; and mutually verify with the sulfite ion concentration to achieve dual-mode feedback control of the oxidation system; The fourth liquid storage bottle (15) is connected to the reactor (1) via a protective liquid hose (23), and the injection pump (11) is arranged on the protective liquid hose (23); The reactor (1) is mounted with a fixed support (2), and the fixed support (2) is mounted with an electric stirrer (4) and a sprayer (3); the sprayer (3) is connected to municipal water via a pipeline; a first solenoid valve (7) is arranged on the pipeline, and a second solenoid valve (21) is communicatively connected to a host computer.

3. The wet flue gas desulfurization oxidation air regulation method with dual-mode verification feedback according to claim 1, characterized in that: The sampling unit comprises: a slurry hose (17) and a peristaltic pump (6) arranged on the slurry hose (17); The slurry storage tank is connected to the reactor (1) via a slurry hose (17); A drainage pipe (24) is provided at the bottom of the reactor (1), and a first solenoid valve (7) is installed on the drainage pipe (24); The first liquid storage bottle (12), the second liquid storage bottle (13), the third liquid storage bottle (14), the slurry storage tank and the reactor (1) are respectively equipped with liquid level sensors; and the host computer is in communication connection with the liquid level sensors.

4. The wet flue gas desulfurization oxidation air regulation method with dual-mode verification feedback according to claim 1, characterized in that: The method further comprises: adding an excess of a standard iodine solution to the desulfurized slurry in the reactor, so that the standard iodine solution reacts with sulfite ions in the desulfurized slurry to oxidize the desulfurized slurry into sulfate ions; The remaining iodine is reduced by dropping a quantitative sodium thiosulfate standard solution into the desulfurization slurry, thereby determining the consumption of the iodine standard solution and inverting the concentration of sulfite ions in the desulfurization slurry; The sulfite ion concentration is calculated as: C(SO3 2- )=[V(I2)C(I2)-0.5V(S2O3 2- )C(S2O3 2- )] / V Where V represents the volume of desulfurized slurry, S2O3 2- represents thiosulfate ion, and I2 represents a molecule formed by two iodine atoms bound together by covalent bonds.

5. The wet flue gas desulfurization oxidation air regulation method with dual-mode verification feedback according to claim 1, characterized in that: The method further includes: when the redox potential is lower than a preset value at this time, the sulfite concentration is higher than the detection upper limit, and another detection process needs to be entered; Stop the second precision injection pump, open the first solenoid valve and the second solenoid valve to discharge the wastewater, and rinse the reactor; After the flushing is completed, the peristaltic pump is turned on, and the desulfurization slurry in the slurry storage tank is quantitatively pumped into the reactor, and then the first precision injection pump draws the excess iodine standard solution in the first liquid storage bottle and pumps it into the reactor; The peristaltic pump starts to reverse and pumps the remaining slurry in the slurry hose into the slurry storage tank in reverse direction; The electric stirrer is controlled to continuously stir the slurry in the reactor, and the upper computer obtains the potential indication through the redox electrode; The third precision injection pump draws the sodium thiosulfate standard solution in the third liquid storage bottle for quantitative titration. Each time the third precision injection pump performs quantitative titration, the host computer records the value.

6. The wet flue gas desulfurization oxidation air regulation method with dual-mode verification feedback according to claim 1, characterized in that: The method also includes: when the system is shut down for maintenance, the host computer controls the opening of the first solenoid valve, the second solenoid valve and the sprayer to flush the reactor, and after the flushing is completed, the first solenoid valve and the second solenoid valve are closed, and the injection pump is turned on to quantitatively pump the solution in the fourth liquid storage bottle into the reactor so that the highest point of the liquid level is higher than the detection position of the redox electrode.

7. The wet flue gas desulfurization oxidation air regulation method with dual-mode verification feedback according to claim 1, characterized in that: The method also includes: Real-time monitoring of sulfite and dissolved oxygen information groups, and establishment of a corresponding feedback mechanism. When the sulfite and dissolved oxygen information groups are detected to exceed the preset threshold range, an alarm prompt is triggered; The sulfite and dissolved oxygen information groups under the alarm state are also input into the preset training model. After the sulfite and dissolved oxygen information groups are predicted, the predicted results are compared with the actual results, the errors are calculated and fed back to the long short-term memory network model, and the long short-term memory network model parameters are updated.

8. The wet flue gas desulfurization oxidation air regulation method with dual-mode verification feedback according to claim 1, characterized in that: The method also includes: Obtain the sulfite and dissolved oxygen information group in the system; Constructing a sulfite and dissolved oxygen information reaction regulation knowledge graph in the sulfite and dissolved oxygen information group, and constructing a sulfite and dissolved oxygen information reaction regulation relationship data set based on the sulfite and dissolved oxygen information reaction regulation knowledge graph; Obtain the mapping relationship between each device in the system and the sulfite and dissolved oxygen information reaction regulation relationship data set, perform data mapping and association matching processing on the sulfite and dissolved oxygen information reaction regulation relationship data set and the pre-built predicted sulfite and dissolved oxygen information group, and obtain the association relationship between the system's knowledge graph and the sulfite and dissolved oxygen correlation model; The system equipment operation data is acquired in real time, and the operation data is input into the knowledge graph and the sulfite and dissolved oxygen correlation model for fault diagnosis detection and analysis, thus obtaining early warning analysis suggestions integrating the knowledge graph and the digital prediction sulfite and dissolved oxygen information group.

Images