System for intelligently controlling oxidation rule change of boiler reheater through pH value

Abstract

The invention discloses an intelligent pH value control boiler reheater oxidation rule change system which comprises a pH value monitoring unit, a data analysis and control unit and a medicament adding unit, the pH value monitoring unit comprises at least one pH value sensor, and the data analysis and control unit comprises an oxidation rule model. The data analysis and control unit is used for receiving the actual pH value data monitored by the pH value monitoring unit and generating a control instruction according to an oxidation rule model and the actual pH value data, and the agent adding unit is used for adding a pH value adjusting agent into the boiler reheater so as to adjust the pH value of a working medium. And the medicament adding unit is electrically connected with the data analysis and control unit and works according to the control instruction. According to the system for intelligently controlling the oxidation rule change of the boiler reheater through the pH value, generation and stripping of oxide skin can be restrained, the heat efficiency and operation safety of the boiler reheater are improved, and the maintenance cost and the shutdown risk are reduced.

Description

Technical Field

[0001] The invention relates to the field of boilers, and in particular to a system for intelligently controlling changes in oxidation laws of boiler reheaters using a pH value. Background Art

[0002] The boiler reheater is a key component in the boiler system for increasing the steam temperature. Its long-term operation is easily affected by factors such as water quality, temperature, and pressure, which can cause oxidation on the surface of the reheater pipes, thereby affecting the overall efficiency and safety of the boiler. However, the reheater is under high temperature, high pressure, and complex chemical environment for a long time, and metal materials are very prone to oxidation reactions. The continuous generation and accumulation of oxide scales will seriously affect the heat transfer efficiency of the reheater. For example, the oxide scale will form an insulating layer on the surface of the tube wall, making it impossible to effectively transfer heat, resulting in a local temperature increase in the reheater, which in turn affects the thermal performance and operational stability of the entire boiler system. Moreover, the peeling of the oxide scale may also cause problems such as pipe blockage and wear, which seriously threatens the safe operation of the boiler and increases maintenance costs and downtime.

[0003] There are many deficiencies in the current control methods for boiler reheater oxidation problems. Traditional methods mainly rely on regular manual inspection and maintenance, such as visual inspection of the reheater appearance and wall thickness measurement. This method can only detect oxidation problems that have already formed a certain scale, and cannot effectively intervene in the early stages of oxidation. In addition, some automated control methods based on fixed parameter settings cannot adjust the control strategy in real time and accurately because they do not take into account the complex and changeable operating conditions in actual operation, such as load changes and medium composition fluctuations, and it is difficult to effectively inhibit the formation and development of oxide scale. Summary of the invention

[0004] The present invention aims to solve at least one of the technical problems existing in the prior art. To this end, one purpose of the present invention is to propose a system for intelligent pH value control of the oxidation law change of a boiler reheater, which includes a pH value monitoring unit to detect the pH value of the working medium in the boiler reheater, and enables the data analysis and control unit to generate control instructions according to the oxidation law model and the actual pH value data, and add a pH value regulating agent, so as to monitor and control the pH value of the working medium of the boiler reheater in real time, control the oxidation process of the boiler reheater, inhibit the formation and peeling of oxide scale, improve the thermal efficiency and operation safety of the boiler reheater, reduce maintenance costs and shutdown risks, and ensure the stable and reliable operation of the boiler system.

[0005] According to an embodiment of the present invention, a system for intelligently controlling the oxidation law change of a boiler reheater by using an intelligent pH value comprises: a pH value monitoring unit, wherein the pH value monitoring unit comprises at least one pH value sensor, wherein the pH value sensor is used to be installed on the boiler reheater to detect the pH value of the working medium in the boiler reheater; a data analysis and control unit, wherein the pH value monitoring unit is electrically connected to the data analysis and control unit, wherein the data analysis and control unit comprises an oxidation law model, wherein the data analysis and control unit is used to receive the actual pH value data monitored by the pH value monitoring unit and to generate a control instruction according to the oxidation law model and the actual pH value data; and a reagent adding unit, wherein the reagent adding unit is used to add a pH value adjusting reagent into the boiler reheater to adjust the pH value of the working medium, wherein the reagent adding unit is electrically connected to the data analysis and control unit and operates according to the control instruction.

[0006] According to the system for intelligently controlling the changes in the oxidation law of a boiler reheater using an intelligent pH value according to an embodiment of the present invention, a pH value monitoring unit is included to detect the pH value of the working medium in the boiler reheater, and a data analysis and control unit generates a control instruction according to the oxidation law model and the actual pH value data, and a pH value adjusting agent is added. This can monitor and regulate the pH value of the working medium of the boiler reheater in real time, control the oxidation process of the boiler reheater, inhibit the formation and peeling of oxide scale, improve the thermal efficiency and operational safety of the boiler reheater, reduce maintenance costs and shutdown risks, and ensure stable and reliable operation of the boiler system.

[0007] According to some embodiments of the present invention, there are multiple pH sensors, and at least some of the pH sensors are arranged at the inlet, outlet and elbow of the boiler reheater.

[0008] According to some embodiments of the present invention, the pH sensor is made of a high temperature and high pressure resistant material, and the probe of the pH sensor is coated with a protective coating, which is a coating with anti-corrosion and anti-scaling functions.

[0009] According to some embodiments of the present invention, the reagent adding unit includes a reagent storage tank, a metering pump and a conveying pipeline, the reagent storage tank has a first storage chamber and a second storage chamber, the first storage chamber is used to store alkaline pH adjusting agents, and the second storage chamber is used to store acidic pH adjusting agents, the conveying pipeline is connected to the reagent outlet of the reagent storage tank, the metering pump is arranged in the conveying pipeline, and the conveying pipeline is used to convey the pH adjusting agents in the first storage chamber or the second storage chamber to the boiler reheater.

[0010] According to some embodiments of the present invention, there are two medicine outlets, one of which is connected to the first storage chamber, and the other of which is connected to the second storage chamber. There are two delivery pipes, and there are two metering pumps. The two delivery pipes are respectively connected to the two medicine outlets, and the two metering pumps are respectively arranged on the two delivery pipes.

[0011] According to some embodiments of the present invention, the data analysis and control unit generates control instructions for the oxidation law model and the actual pH value data, including: predicting the boiler reheater oxide scale generation and the optimal pH value range based on the oxidation law model and the actual pH value data.

[0012] According to some embodiments of the present invention, predicting the boiler reheater scale generation includes: generating a scale generation rate formula Δx=a·T according to the oxidation law model and the actual pH value data. b ·t c , where a, b, c are empirical constants, T is temperature, and t is time.

[0013] According to some embodiments of the present invention, the oxidation law model includes built-in operating parameters and water quality parameters, the operating parameters include temperature, pressure and flow, and the water quality parameters include dissolved oxygen and water hardness.

[0014] According to some embodiments of the present invention, a remote monitoring and early warning unit is further included. The remote monitoring and early warning unit is communicatively connected with the pH value monitoring unit and the data analysis and control unit via a communication network. The remote monitoring and early warning unit determines whether there is an abnormality in the boiler reheater based on the data transmitted by the pH value monitoring unit and the data analysis and control unit, so as to issue an alarm message when an abnormality occurs in the boiler reheater.

[0015] According to some embodiments of the present invention, the abnormal situation includes at least one of a pH value exceeding a normal fluctuation range, a sudden increase in oxidation rate, a failure of the pH sensor, a failure of the drug addition unit, and a communication interruption.

[0016] Additional aspects and advantages of the present invention will be given in part in the following description and in part will be obvious from the following description, or will be learned through practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The above and / or additional aspects and advantages of the present invention will become apparent and easily understood from the description of the embodiments in conjunction with the following drawings, in which:

[0018] Figure 1is a simplified diagram of a system for controlling changes in oxidation law of a boiler reheater using intelligent pH value according to some embodiments of the present invention;

[0019] Figure 2 yes Figure 1 Schematic diagram of the assembly of pH sensor and boiler reheater;

[0020] Figure 3 yes Figure 1 A simplified diagram of the drug addition unit.

[0021] Reference numerals:

[0022] 100. System;

[0023] 10. pH value monitoring unit; 11. pH value sensor;

[0024] 20. Data analysis and control unit;

[0025] 30. Medicine adding unit; 31. Medicine storage tank; 32. First storage chamber; 33. Second storage chamber; 34. Metering pump; 35. Delivery pipeline;

[0026] 40. Boiler reheater. DETAILED DESCRIPTION

[0027] Embodiments of the present invention are described in detail below, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and cannot be understood as limiting the present invention.

[0028] Reference Figure 1-Figure 3 According to an embodiment of the present invention, a system 100 for intelligently controlling the oxidation law change of a boiler reheater 40 with an intelligent pH value includes: a pH value monitoring unit 10, a data analysis and control unit 20, and a reagent adding unit 30.

[0029] The pH value monitoring unit 10 includes at least one pH value sensor 11, which is used to be installed in the boiler reheater 40 to detect the pH value of the working medium in the boiler reheater 40. During the operation of the boiler, the pH value sensor 11 continuously collects pH value information of the working medium, and can measure the pH value of the working medium in the boiler reheater 40 in real time and accurately. For example, the collection frequency can be dynamically adjusted according to the operating conditions of the boiler to ensure the timeliness and effectiveness of the data.

[0030] For example, relevant personnel clean and inspect the sensor of the pH value monitoring unit 10 once a month. Use special cleaning tools and reagents to remove dirt and scaling on the surface of the sensor probe, check the sealing performance of the sensor and whether the connection parts are loose, and ensure that the pH value monitoring unit 10 can accurately and timely measure the pH value of the working medium in the boiler reheater 40.

[0031] The pH value monitoring unit 10 is electrically connected to the data analysis and control unit 20, which includes an oxidation law model. The data analysis and control unit 20 is used to receive the actual pH value data monitored by the pH value monitoring unit 10 and to generate control instructions according to the oxidation law model and the actual pH value data. After receiving the pH value data, the data analysis and control unit 20 uses the oxidation law model for real-time analysis. By calculating the influence of the current pH value on the oxidation reaction rate, the trend of oxide scale formation, etc., the oxidation state of the reheater is evaluated to determine whether the pH value needs to be adjusted.

[0032] The reagent adding unit 30 is used to add a pH adjusting agent into the boiler reheater 40 to adjust the pH value of the working medium. The reagent adding unit 30 is electrically connected to the data analysis and control unit 20 and operates according to the control instruction. By making the reagent adding unit 30 add the pH adjusting agent into the boiler reheater 40 according to the control instruction, the pH value can be more accurately controlled within the optimal range, effectively inhibiting the formation of oxide scale in the early stage, and significantly reducing the impact of oxidation on the performance of the reheater.

[0033] For example, the reagent adding unit 30 can add an acidic reagent and an alkaline reagent into the boiler reheater 40 to adjust the pH value of the working medium to decrease or increase, respectively.

[0034] During the operation of the boiler, the pH sensor 11 continuously collects the pH information of the working medium and transmits the pH information of the working medium to the data analysis and control unit 20. The data analysis and control unit 20 generates a control instruction based on the oxidation law model and the actual pH data, and controls the reagent adding unit 30 to add the pH adjusting reagent to the boiler reheater 40 to adjust the pH value of the working medium. By adjusting the pH value of the working medium, the generation and peeling of oxide scales are effectively controlled, the safety hazards such as pipeline blockage and local overheating are reduced, and the possibility of equipment damage and shutdown maintenance caused by oxidation problems is reduced. At the same time, the heat transfer efficiency of the reheater is improved, energy is saved, the operating cost is reduced, and the service life of the equipment is extended.

[0035] According to the system 100 for intelligently controlling the oxidation law changes of the boiler reheater 40 by using the pH value in an embodiment of the present invention, a pH value monitoring unit 10 is included to detect the pH value of the working medium in the boiler reheater 40, and a data analysis and control unit 20 generates a control instruction according to the oxidation law model and the actual pH value data, and adds a pH value adjusting agent. Thus, the pH value of the working medium of the boiler reheater 40 can be monitored and regulated in real time, the oxidation process of the boiler reheater 40 can be controlled, the generation and peeling of oxide scale can be inhibited, the thermal efficiency and operation safety of the boiler reheater 40 can be improved, the maintenance cost and the risk of downtime can be reduced, and the stable and reliable operation of the boiler system 100 can be ensured.

[0036] According to some embodiments of the present invention, referring to Figure 2 There are multiple pH sensors 11, and at least some of the pH sensors 11 are disposed at the inlet, outlet, and elbow of the boiler reheater 40. Since the inlet, outlet, and elbow of the boiler reheater 40 are more easily oxidized to form oxide scale, by disposing at least some of the pH sensors 11 at the inlet, outlet, and elbow of the boiler reheater 40, it is possible to monitor and adjust these parts more easily to form oxide scale, thereby more fully inhibiting the formation and peeling of oxide scale.

[0037] According to some embodiments of the present invention, the pH sensor 11 is made of a high temperature and high pressure resistant material, and the probe of the pH sensor 11 is coated with a protective coating, which is a coating with anti-corrosion and anti-scaling functions. By making the pH sensor 11 made of a high temperature and high pressure resistant material, it is possible to prevent the pH sensor 11 from being damaged by the high temperature and high pressure environment of the boiler reheater 40 and causing failure. By coating the probe of the pH sensor 11 with a coating with anti-corrosion and anti-scaling functions, it is possible to prevent the pH sensor 11 from being corroded or the medium in the boiler reheater 40 from scaling on the pH sensor 11 and causing failure of the pH sensor 11.

[0038] For example, when installing the pH sensor 11, it is necessary to ensure that the probe of the pH sensor 11 is completely immersed in the working medium and avoid being directly impacted by the flow of the medium to avoid affecting the measurement accuracy. After installation, each pH sensor 11 needs to be calibrated using a standard buffer solution under simulated working temperature and pressure conditions to ensure the accuracy of the pH sensor 11 measurement.

[0039] For example, once a month, the pH sensor 11 is cleaned and inspected. Special cleaning tools and reagents are used to remove dirt and scaling on the surface of the sensor probe, and the sealing performance of the pH sensor 11 and whether the connection parts are loose are checked.

[0040] According to some embodiments of the present invention, referring to Figure 3The reagent adding unit 30 includes a reagent storage tank 31, a metering pump 34 and a delivery pipeline 35. The reagent storage tank 31 has a first storage chamber 32 and a second storage chamber 33. The first storage chamber 32 is used to store alkaline pH adjusting reagents, and the second storage chamber 33 is used to store acidic pH adjusting reagents. The delivery pipeline 35 is connected to the reagent outlet of the reagent storage tank 31. The metering pump 34 is provided in the delivery pipeline 35. The delivery pipeline 35 is used to deliver the pH adjusting reagents in the first storage chamber 32 or the second storage chamber 33 to the boiler reheater 40. By providing the reagent storage tank 31 with the first storage chamber 32 and the second storage chamber 33, the first storage chamber 32 is used to store alkaline pH adjusting reagents, and the second storage chamber 33 is used to store acidic pH adjusting reagents, the reagent adding unit 30 can both reduce the pH value of the medium in the boiler reheater 40 and increase the pH value of the medium in the boiler reheater 40. By making the reagent adding unit 30 include a metering pump 34, the metering pump 34 can weigh the content of the reagent added by the reagent adding unit 30, so that the pH value of the medium in the boiler reheater 40 can be more accurately adjusted, and the generation and flaking of oxide scale can be more fully suppressed.

[0041] For example, the drug storage tank 31, metering pump 34 and delivery pipeline 35 of the drug adding unit 30 are inspected once a month to ensure that there is no leakage of the drug, the accuracy of the metering pump 34 is within the specified range, and the delivery pipeline 35 is unobstructed.

[0042] According to some embodiments of the present invention, referring to Figure 3 There are two reagent outlets, one of which is communicated with the first storage chamber 32, and the other of which is communicated with the second storage chamber 33. There are two delivery pipes 35, and two metering pumps 34. The two delivery pipes 35 are respectively connected to the two reagent outlets, and the two metering pumps 34 are respectively arranged in the two delivery pipes 35. By having two reagent outlets and two delivery pipes 35, the acidic reagent and the alkaline reagent can flow into the boiler reheater 40 through different delivery pipes 35 to adjust the pH value of the medium in the boiler reheater 40, so that the pH value can be adjusted more accurately, and the reaction between the reagent introduced into the boiler reheater 40 and the reagent remaining on the wall of the delivery pipe 35 can be avoided, resulting in an error between the actual adjustment of the pH value and the control instruction.

[0043] According to some embodiments of the present invention, the data analysis and control unit 20 generates control instructions for the oxidation law model and the actual pH value data, including: predicting the generation of oxide scale and the optimal pH value range of the boiler reheater 40 according to the oxidation law model and the actual pH value data. Since the data analysis and control unit 20 considers the influence of various operating parameters on the oxidation reaction, the system 100 for intelligent pH value control of the oxidation law change of the boiler reheater 40 can automatically adjust the pH value control strategy under complex working conditions such as boiler load changes and medium composition fluctuations, ensure that the oxidation process is always in a controllable state, and improve the stability and reliability of the reheater under different operating conditions.

[0044] For example, the oxidation law model analyzes and processes the data once every 5 minutes, and calculates the current oxidation state using the oxidation law model in combination with the real-time acquired operating parameters such as temperature, pressure, and flow rate. If the calculation result shows that the pH value is within the optimal range and the oxidation reaction is in a stable inhibition state, the system 100 maintains the current operating state, and the reagent addition unit 30 does not perform the reagent addition operation. When the data analysis and control unit 20 detects that the pH value deviates from the optimal range, a control instruction is generated according to the degree of deviation and the current oxidation trend. For example, if the pH value is too high, it indicates that the oxidation environment in the boiler reheater 40 is alkaline, which may accelerate the formation of oxide scale. At this time, the control instruction will instruct the reagent addition unit 30 to extract an appropriate amount of acidic reagent from the storage tank and add the reagent to the reheater system 100 through the metering pump 34 according to the predetermined flow rate and time. During the reagent addition process, the change of pH value is continuously monitored, and when the pH value returns to the optimal range, the reagent addition operation is stopped. At the same time, the data of the pH value adjustment process is recorded, including the adjustment time, the type and dosage of the added reagent, the pH value change curve, etc., for subsequent analysis and optimization of the system 100 control strategy.

[0045] For example, once a month, the hardware equipment of the data analysis and control unit 20 and the remote monitoring and early warning unit is cleaned and maintained, the circuit boards, communication interfaces, etc. are checked to see if they are normal, the software virus database and security patches are updated to ensure the stable operation of the system 100.

[0046] For example, the parameters of the oxidation law model are updated quarterly based on the actual operation of the boiler reheater 40 and long-term monitoring data. If a new medium component is found to have a significant effect on the oxidation reaction during operation, or the operating load mode of the boiler has changed, the parameters related to these factors in the model are adjusted accordingly. At the same time, key control parameters such as the optimal pH range are optimized based on new experimental data or the latest research results in the industry. After the parameters are updated, the system 100 is simulated and tested to ensure that the system 100 can operate normally under the new parameters and can more effectively control the oxidation process of the reheater.

[0047] According to some embodiments of the present invention, predicting the scale generation of the boiler reheater 40 includes: generating a scale generation rate formula Δx=a·T according to the oxidation law model and the actual pH value data. b ·t c , where a, b, c are empirical constants, T is temperature, and t is time. The method of predicting the scale generation of the boiler reheater 40 includes: generating a scale generation rate formula according to the oxidation law model and actual pH value data, and the generation rate formula is based on measured data and combined with the specific properties of the material, so as to quickly estimate the scale generation situation.

[0048] According to some embodiments of the present invention, the oxidation law model includes built-in operating parameters and water quality parameters, the operating parameters include temperature, pressure and flow, and the water quality parameters include dissolved oxygen and water hardness. By making the oxidation law model include built-in operating parameters and water quality parameters, considering the influence of multiple operating parameters on the oxidation reaction, the system 100 can automatically adjust the pH value control strategy under complex working conditions such as boiler load changes and medium composition fluctuations, and the generated control instructions are more accurate.

[0049] According to some embodiments of the present invention, a remote monitoring and early warning unit is further included. The remote monitoring and early warning unit is connected to the pH value monitoring unit 10 and the data analysis and control unit 20 through a communication network. The remote monitoring and early warning unit determines whether the boiler reheater 40 is abnormal based on the data transmitted by the pH value monitoring unit 10 and the data analysis and control unit 20, so as to issue an alarm message when an abnormality occurs in the boiler reheater 40. The operation status of the system 100 can be understood remotely and in real time, and abnormal alarms can be received in time, which is convenient for rapid response and problem handling. It can not only improve management efficiency and reduce the pressure of personnel monitoring, but also avoid the expansion of accidents in the event of an emergency, and ensure the safe operation of the boiler system 100.

[0050] According to some embodiments of the present invention, the abnormal situation includes at least one of a pH value exceeding a normal fluctuation range, a sudden increase in oxidation rate, a failure of the pH sensor 11, a failure of the reagent adding unit 30, and a communication interruption. When an abnormal situation occurs during operation, the system 100 automatically starts a corresponding fault handling procedure, which can improve management efficiency, reduce the pressure of personnel monitoring, and avoid the expansion of accidents in an emergency, thereby ensuring the safe operation of the boiler system 100.

[0051] For example, if the pH sensor 11 fails, the system 100 will issue an alarm to prompt the operator to promptly replace the failed pH sensor 11. When the system 100 includes a spare pH sensor 11, the system 100 will control the switch to the spare pH sensor 11 to continue to detect the environment of the boiler reheater 40.

[0052] For example, if there is a problem with the reagent adding unit 30, the system 100 controls the reagent adding unit 30 to stop the adding operation and displays the fault information on the remote monitoring terminal, and the operator can perform fault troubleshooting and repair according to the prompt. At the same time, the remote monitoring and early warning unit transmits the operating data of the system 100, including pH value data, oxidation state evaluation results, control instruction execution status, etc., to the remote terminal in real time.

[0053] For example, when the pH sensor 11 detects that the oxidation rate has increased abnormally, the pH value exceeds the preset safety fluctuation range, or other key parameters are abnormal, the system 100 immediately sends an alarm message to the operator, including text messages, emails, or pop-up warning boxes on the remote monitoring interface, so that the operator can take timely measures, such as adjusting operating parameters, checking equipment, or initiating emergency plans.

[0054] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the present invention.

[0055] In the description of the present invention, "first feature" or "second feature" may include one or more of the features.

[0056] In the description of the present invention, "plurality" means two or more.

[0057] In the description of the present invention, a first feature being “on” or “under” a second feature may include that the first and second features are directly in contact with each other, or may include that the first and second features are not in direct contact with each other but are in contact with each other via another feature therebetween.

[0058] In the description of the present invention, "above", "over" and "on" a first feature includes the first feature being directly above and obliquely above the second feature, or simply means that the first feature is horizontally higher than the second feature.

[0059] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "illustrative embodiments", "examples", "specific examples", or "some examples" means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner.

[0060] Although the embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the claims and their equivalents.

Claims

1. A system for intelligent pH value control of boiler reheater oxidation law changes, characterized in that: include: A pH value monitoring unit, wherein the pH value monitoring unit comprises at least one pH value sensor, wherein the pH value sensor is used to be installed in the boiler reheater to detect the pH value of the working medium in the boiler reheater; A data analysis and control unit, the pH value monitoring unit is electrically connected to the data analysis and control unit, the data analysis and control unit includes an oxidation law model, and the data analysis and control unit is used to receive the actual pH value data monitored by the pH value monitoring unit and to generate a control instruction according to the oxidation law model and the actual pH value data; The reagent adding unit is used to add a pH adjusting reagent into the boiler reheater to adjust the pH value of the working medium. The reagent adding unit is electrically connected to the data analysis and control unit and works according to the control instruction.

2. The system for controlling the change of oxidation law of boiler reheater by intelligent pH value according to claim 1 is characterized in that: There are multiple pH sensors, and at least some of the pH sensors are arranged at the inlet, outlet and elbow of the boiler reheater.

3. The system for controlling the change of oxidation law of boiler reheater by intelligent pH value according to claim 1 is characterized in that: The pH sensor is made of a high temperature and high pressure resistant material, and a probe of the pH sensor is coated with a protective coating, which is a coating with anti-corrosion and anti-scaling functions.

4. The system for controlling the change of oxidation law of boiler reheater by intelligent pH value according to claim 1 is characterized in that: The reagent adding unit includes a reagent storage tank, a metering pump and a conveying pipeline. The reagent storage tank has a first storage chamber and a second storage chamber. The first storage chamber is used to store alkaline pH adjusting reagents, and the second storage chamber is used to store acidic pH adjusting reagents. The conveying pipeline is connected to the reagent outlet of the reagent storage tank. The metering pump is arranged on the conveying pipeline. The conveying pipeline is used to convey the pH adjusting reagents in the first storage chamber or the second storage chamber to the boiler reheater.

5. The system for controlling the change of oxidation law of boiler reheater by intelligent pH value according to claim 4 is characterized in that: There are two medicine outlets, one of which is connected to the first storage chamber, and the other of which is connected to the second storage chamber. There are two delivery pipes, and there are two metering pumps. The two delivery pipes are respectively connected to the two medicine outlets, and the two metering pumps are respectively arranged on the two delivery pipes.

6. The system for controlling the change of oxidation law of boiler reheater by intelligent pH value according to claim 1 is characterized in that: The data analysis and control unit generates control instructions for the oxidation law model and the actual pH value data, including: predicting the boiler reheater oxide scale generation and the optimal pH value range according to the oxidation law model and the actual pH value data.

7. The system for controlling the change of oxidation law of boiler reheater by intelligent pH value according to claim 1 is characterized in that: Predicting the boiler reheater scale generation includes: generating a scale generation rate formula Δx=a·T according to the oxidation law model and the actual pH value data b ·t c , where a, b, c are empirical constants, T is temperature, and t is time.

8. The system for controlling the change of oxidation law of boiler reheater by intelligent pH value according to claim 1 is characterized in that: The oxidation law model includes built-in operating parameters and water quality parameters. The operating parameters include temperature, pressure and flow rate, and the water quality parameters include dissolved oxygen and water hardness.

9. The system for controlling the change of oxidation law of boiler reheater by intelligent pH value according to any one of claims 1 to 8, characterized in that: It also includes a remote monitoring and early warning unit, which is connected to the pH value monitoring unit and the data analysis and control unit through a communication network. The remote monitoring and early warning unit determines whether the boiler reheater is abnormal based on the data transmitted by the pH value monitoring unit and the data analysis and control unit, so as to issue an alarm message when an abnormality occurs in the boiler reheater.

10. The system for controlling the change of oxidation law of boiler reheater by intelligent pH value according to claim 9 is characterized in that: The abnormal situation includes at least one of a pH value exceeding a normal fluctuation range, a sudden increase in oxidation rate, a failure of the pH sensor, a failure of the drug adding unit, and a communication interruption.

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