Device and method for automatically adjusting pH of waste water of thermal power plant

Abstract

The invention discloses a thermal power plant wastewater pH automatic adjusting device and method, an outlet of a water inlet pipeline is communicated with an inlet of a first neutralization tank through a first water inlet electric valve, an outlet of a dosing metering pump is communicated with the first neutralization tank through a first neutralization tank dosing electric valve, a first rotational flow stirring device is arranged in the first neutralization tank, and a second rotational flow stirring device is arranged in the second neutralization tank. An outlet of the first neutralization tank is divided into three paths through a first circulating water pump, the first path is communicated with a first rotational flow stirring device through a first water return electric valve, the second path is communicated with an inlet of a sampling electromagnetic valve, and the third path is communicated with a water outlet pipeline through a first water outlet electric valve; an outlet of the sampling electromagnetic valve is communicated with a self-cleaning type online pH monitoring instrument through a sampling flowmeter. The device and the method can be used for accurately and efficiently adjusting the pH value of the acid wastewater to a target range at low cost.

Description

Technical Field

[0001] The invention belongs to the technical field of wastewater treatment in thermal power plants, and relates to a device and method for automatically adjusting pH value of wastewater in thermal power plants. Background Art

[0002] The fine treatment system of a thermal power plant will produce a large amount of acidic wastewater with a low pH value during system regeneration. This part of acidic wastewater often needs to increase its pH value to between 6.5 and 8.0 in a short period of time to facilitate recycling in other systems. Currently, pH adjustment mainly relies on manual measurement and manual dosing. In actual operation, there are problems such as high labor intensity, poor adjustment accuracy, low work efficiency and high treatment cost. Summary of the invention

[0003] The purpose of the present invention is to overcome the shortcomings of the above-mentioned prior art and provide a device and method for automatically adjusting the pH value of wastewater from a thermal power plant, which can accurately, efficiently and at a low cost adjust the pH value of acidic wastewater to a target range.

[0004] To achieve the above-mentioned purpose, the present invention discloses an automatic pH regulating device for wastewater in a thermal power plant, comprising an incoming water pipeline, a first water inlet electric valve, a first neutralization tank, a dosing metering pump, a first neutralization tank dosing electric valve, a first return water electric valve, a sampling solenoid valve, an outflow pipeline and a self-cleaning online pH monitoring instrument;

[0005] The outlet of the incoming water pipeline is connected with the inlet of the first neutralization tank through the first water inlet electric valve, the outlet of the dosing metering pump is connected with the first neutralization tank through the first neutralization tank dosing electric valve, a first cyclone stirring device is arranged in the first neutralization tank, and the outlet of the first neutralization tank is divided into three routes through the first circulating water pump, wherein the first route is connected with the first cyclone stirring device through the first return water electric valve, the second route is connected with the inlet of the sampling solenoid valve, the third route is connected with the water outlet pipeline through the first water outlet electric valve, and the outlet of the sampling solenoid valve is connected with a self-cleaning online pH monitoring instrument through a sampling flowmeter.

[0006] Furthermore, it also includes a second neutralization tank, the outlet of the incoming water pipe is connected to the inlet of the second neutralization tank via the second water inlet electric valve, the outlet of the dosing metering pump is connected to the second neutralization tank via the second neutralization tank dosing electric valve, a second vortex stirring device is arranged in the second neutralization tank, and the outlet of the second neutralization tank is divided into three routes after passing through the second circulating water pump, wherein the first route is connected to the second vortex stirring device via the second return water electric valve, the second route is connected to the inlet of the sampling solenoid valve, and the third route is connected to the outlet pipe via the second water outlet electric valve.

[0007] Furthermore, the first cyclone stirring device and the second cyclone stirring device are metal spiral structures.

[0008] Furthermore, the self-cleaning online pH monitoring instrument is equipped with corrosion-resistant electrodes.

[0009] Furthermore, the dosing metering pump is a mechanical diaphragm pump.

[0010] Furthermore, the intelligent control system is connected with a self-cleaning online pH monitoring instrument, a dosing metering pump, a first neutralization tank dosing electric valve and a second neutralization tank dosing electric valve.

[0011] The invention discloses a method for automatically adjusting pH value of wastewater from a thermal power plant, comprising the following steps:

[0012] Obtain a self-cleaning online pH monitoring instrument to monitor the pH value of the wastewater;

[0013] The frequency of the dosing metering pump is controlled according to the pH value of the wastewater monitored by the self-cleaning online pH monitoring instrument.

[0014] Furthermore, when the pH value of the wastewater monitored by the self-cleaning online pH monitoring instrument is less than 4, the frequency value of the dosing metering pump is controlled to be greater than or equal to 45 Hz.

[0015] Furthermore, when the pH value of the wastewater monitored by the self-cleaning online pH monitoring instrument is greater than or equal to 4 and less than 6.5, the frequency value of the dosing metering pump is controlled to Hz=k1*△pH+b, where k1 is the slope, △pH is the deviation between the target pH and the current pH, and b is the offset.

[0016] Furthermore, when the pH value of the wastewater monitored by the self-cleaning online pH monitoring instrument is greater than or equal to 6.5, the frequency value of the dosing metering pump is controlled. Among them, e n is the deviation between the target pH and the current pH, T s is the sampling period, K p、 K i、 K d Represent the proportional, integral, and differential coefficients respectively.

[0017] The present invention has the following beneficial effects:

[0018] The thermal power plant wastewater automatic pH adjustment device and method described in the present invention monitors the pH value of the wastewater through a self-cleaning online pH monitoring instrument during specific operation, and controls the working frequency of the dosing metering pump based on this, and then adjusts the dosage of the neutralization water tank, thereby achieving the purpose of accurately, efficiently and low-costly adjusting the pH value of the acidic wastewater to the target range.

[0019] Furthermore, the present invention selects different control strategies to control the frequency of the dosing metering pump according to the pH value of the wastewater, thereby accurately and quickly adjusting the pH value of the acidic wastewater to a target range. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] The accompanying drawings constituting a part of the present invention are used to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation of the present invention. In the accompanying drawings:

[0021] Figure 1 The present invention is a flow chart of the method.

[0022] Among them, 1 is the first water inlet electric valve, 2 is the first circulating water pump, 3 is the first water outlet electric valve, 4 is the first return water electric valve, 5 is the first vortex stirring device, 6 is the second water inlet electric valve, 7 is the second circulating water pump, 8 is the second water outlet electric valve, 9 is the second return water electric valve, 10 is the second vortex stirring device, 11 is the sampling solenoid valve, 12 is the sampling flow meter, 13 is the self-cleaning online pH monitoring instrument, 14 is the dosing metering pump, 15 is the first neutralization tank dosing electric valve, 16 is the second neutralization tank dosing electric valve, and 103 is the intelligent control system. DETAILED DESCRIPTION

[0023] 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 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.

[0024] In the description of the present invention, it should be understood that the terms “include” and “comprises” indicate the presence of described features, wholes, steps, operations, elements and / or components, but do not exclude the presence or addition of one or more other features, wholes, steps, operations, elements, components and / or collections thereof.

[0025] It should also be understood that the terms used in the present specification are only for the purpose of describing specific embodiments and are not intended to limit the present invention. As used in the present specification and the appended claims, unless the context clearly indicates otherwise, the singular forms "a", "an" and "the" are intended to include plural forms.

[0026] It should be further understood that the term "and / or" used in the present specification and the appended claims refers to any combination of one or more of the associated listed items and all possible combinations, and includes these combinations. For example, A and / or B can represent: A exists alone, A and B exist at the same time, and B exists alone. In addition, the character " / " in the present invention generally indicates that the associated objects are in an "or" relationship.

[0027] It should be understood that, although the terms first, second, third, etc. may be used to describe preset ranges, etc. in the embodiments of the present invention, these preset ranges should not be limited to these terms. These terms are only used to distinguish preset ranges from each other. For example, without departing from the scope of the embodiments of the present invention, the first preset range may also be referred to as the second preset range, and similarly, the second preset range may also be referred to as the first preset range.

[0028] The word "if" as used herein may be interpreted as "at the time of" or "when" or "in response to determining" or "in response to detecting", depending on the context. Similarly, the phrases "if it is determined" or "if (stated condition or event) is detected" may be interpreted as "when it is determined" or "in response to determining" or "when detecting (stated condition or event)" or "in response to detecting (stated condition or event)", depending on the context.

[0029] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, rather than all of the embodiments. The components of the embodiments of the present invention described and shown in the drawings here can usually be arranged and designed in various different configurations. Therefore, the following detailed description of the embodiments of the present invention provided in the drawings is not intended to limit the scope of the claimed invention, but merely represents selected embodiments of the present invention. Based on the embodiments in the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0030] Various structural schematic diagrams of the embodiments disclosed in the present invention are shown in the accompanying drawings. These figures are not drawn to scale, and some details are magnified and some details may be omitted for the purpose of clear expression. The shapes of various regions and layers shown in the figures and the relative sizes and positional relationships therebetween are only exemplary, and may deviate in practice due to manufacturing tolerances or technical limitations, and those skilled in the art may additionally design regions / layers with different shapes, sizes, and relative positions according to actual needs.

[0031] Embodiment 1

[0032] refer to Figure 1 The thermal power plant wastewater pH automatic regulating device of the present invention comprises a first water inlet electric valve 1, a first circulating water pump 2, a first water outlet electric valve 3, a first water return electric valve 4, a first swirl stirring device 5, a second water inlet electric valve 6, a second circulating water pump 7, a second water outlet electric valve 8, a second water return electric valve 9, a second swirl stirring device 10, a sampling solenoid valve 11, a sampling flow meter 12, a self-cleaning online pH monitoring instrument 13, a dosing metering pump 14, a first neutralization tank dosing electric valve 15, a second neutralization tank dosing electric valve 16 and an intelligent control system 17;

[0033] The outlet of the incoming water pipeline is divided into two routes, one of which is connected to the inlet of the first neutralization tank through the first water inlet electric valve 1, and the other is connected to the inlet of the second neutralization tank through the second water inlet electric valve 6. The outlet of the dosing metering pump 14 is connected to the first neutralization tank through the first neutralization tank dosing electric valve 15, and the outlet of the dosing metering pump 14 is connected to the second neutralization tank through the second neutralization tank dosing electric valve 16. The first neutralization tank is provided with a first cyclone stirring device 5, and the second neutralization tank is provided with a second cyclone stirring device 10. The first neutralization tank The outlet of the second neutralization tank is divided into three paths through the first circulating water pump 2, wherein the first path is connected to the first cyclone stirring device 5 through the first water return electric valve 4, the second path is connected to the inlet of the sampling electromagnetic valve 11, and the third path is connected to the outlet pipe through the first water outlet electric valve 3. The outlet of the second neutralization tank is divided into three paths after passing through the second circulating water pump 7, wherein the first path is connected to the second cyclone stirring device 10 through the second water return electric valve 9, the second path is connected to the inlet of the sampling electromagnetic valve 11, and the third path is connected to the outlet pipe through the second water outlet electric valve 8;

[0034] The outlet of the sampling solenoid valve 11 is connected to the self-cleaning online pH monitoring instrument 13 through the sampling flow meter 12 , and the intelligent control system 17 is connected to the self-cleaning online pH monitoring instrument 13 and the dosing metering pump 14 .

[0035] In this embodiment, the first cyclone stirring device 5 and the second cyclone stirring device 10 are metal spiral structures, and the driving force is provided by a circulating water pump, and no external power supply is required.

[0036] In this embodiment, the self-cleaning online pH monitoring instrument 13 is equipped with corrosion-resistant electrodes and has an ultrasonic automatic cleaning function.

[0037] In this embodiment, the dosing metering pump 14 is a mechanical diaphragm pump, which adopts frequency conversion control.

[0038] In this embodiment, the intelligent control system 17 is equipped with a communication module, which can communicate with the host DCS via RS485 to facilitate remote control and monitoring.

[0039] Embodiment 2

[0040] This embodiment is implemented based on the thermal power plant wastewater pH automatic adjustment device described in Embodiment 1, and includes the following steps:

[0041] The volume of the first and second neutralization tanks is 350m 3 The amount of wastewater generated by a single unit is about 200m 3 The initial pH range of the wastewater is 2 to 3, the flow rate of the circulating water pump is 300t / h, and the rated flow rate of the dosing metering pump 14 is 300L / h.

[0042] 1) Wastewater enters the first neutralization tank through the first water inlet electric valve 1; the first water outlet electric valve 3 remains closed, the first water return electric valve 4 is opened, the first circulating water pump 2 is running, and the synchronous self-cleaning online pH monitoring instrument 13 starts detection.

[0043] 2) The intelligent control system 17 determines the difference between the real-time collected pH signal and the target pH (set to 7.6), controls the first neutralization tank dosing electric valve 15, and adjusts the frequency of the dosing metering pump 14.

[0044] When the pH measured by the self-cleaning online pH monitoring instrument 13 is less than 4, the single neutralization tank high-frequency dosing mode (80% NaOH, 200-300 L / h) is enabled, and the frequency of the dosing metering pump 14 is maintained at above 45 Hz.

[0045] When 4≤pH<6.5, the medium frequency dosing mode (80% NaOH, 50-100 L / h) is adopted, and the fuzzy control algorithm is used to segment the pH and control the frequency Hz of the dosing metering pump 14 between 20Hz and 40Hz, wherein the frequency Hz of the dosing metering pump 14 = k1*△pH+b, k1 is the slope of the function; △pH is the deviation between the target pH and the current pH; b is the offset, as shown in Table 1.

[0046] Table 1

[0047]

[0048] When 6.5≤pH≤7.5, a low-frequency and low-flow dosing mode (80% NaOH, 20-50 L / h) is used. At this time, the pH is close to the target range, and a PID control algorithm is used to keep the frequency of the dosing metering pump 14 between 5Hz and 15Hz. e n is the target pH and the current pH,

[0049] Deviation value, T s is the sampling period; K p、 K i、 K dRepresent the proportional, integral, and differential coefficients respectively.

[0050] Final operating parameters: K p 0.0048~0.0076; K i 300~450; K d is 0.5.

[0051] The actual control effect on site is shown in Table 2:

[0052] Table 2

[0053]

[0054] Embodiment 3

[0055] A computer device comprises a memory, a processor and a computer program stored in the memory and executable on the processor. When the processor executes the computer program, the steps of the method for automatically adjusting the pH value of wastewater in a thermal power plant are implemented, for example, comprising: obtaining the pH value of the wastewater monitored by a self-cleaning online pH monitoring instrument 13; controlling the frequency of a dosing metering pump 14 according to the pH value of the wastewater monitored by the self-cleaning online pH monitoring instrument 13; when the pH value of the wastewater monitored by the self-cleaning online pH monitoring instrument 13 is less than 4, the frequency value of the dosing metering pump 14 is controlled to be greater than or equal to 45 Hz; when the pH value of the wastewater monitored by the self-cleaning online pH monitoring instrument 13 is greater than or equal to 4 and less than 6.5, the frequency value of the dosing metering pump 14 is controlled to be Hz=k1*△pH+b, wherein k1 is a slope, △pH is a deviation value between a target pH and a current pH, and b is an offset; when the pH value of the wastewater monitored by the self-cleaning online pH monitoring instrument 13 is greater than or equal to 6.5, the frequency value of the dosing metering pump 14 is controlled to be Among them, e n is the deviation between the target pH and the current pH, T s is the sampling period, K p、 K i、 K d Represent the proportional, integral and differential coefficients respectively. The memory may include a memory, such as a high-speed random access memory, and may also include a non-volatile memory, such as at least one disk memory, etc. The processor, the network interface and the memory are interconnected through an internal bus, and the internal bus may be an industrial standard architecture bus, a peripheral component interconnection standard bus, an extended industrial standard structure bus, etc. The bus may be divided into an address bus, a data bus, a control bus, etc. The memory is used to store programs. Specifically, the program may include a program code, and the program code includes computer operation instructions. The memory may include a memory and a non-volatile memory, and provide instructions and data to the processor.

[0056] Embodiment 4

[0057] A computer-readable storage medium stores a computer program, and when the computer program is executed by a processor, the steps of the method for automatically adjusting the pH value of wastewater in a thermal power plant are implemented, for example, including: obtaining the pH value of the wastewater monitored by a self-cleaning online pH monitoring instrument 13; controlling the frequency of a dosing metering pump 14 according to the pH value of the wastewater monitored by the self-cleaning online pH monitoring instrument 13; when the pH value of the wastewater monitored by the self-cleaning online pH monitoring instrument 13 is less than 4, the frequency value of the dosing metering pump 14 is controlled to be greater than or equal to 45Hz; when the pH value of the wastewater monitored by the self-cleaning online pH monitoring instrument 13 is greater than or equal to 4 and less than 6.5, the frequency value of the dosing metering pump 14 is controlled to be Hz=k1*△pH+b, wherein k1 is the slope, △pH is the deviation value between the target pH and the current pH, and b is the offset; when the pH value of the wastewater monitored by the self-cleaning online pH monitoring instrument 13 is greater than or equal to 6.5, the frequency value of the dosing metering pump 14 is controlled to be Among them, e n is the deviation between the target pH and the current pH, T s is the sampling period, K p、 K i、 K d Represent the proportional, integral and differential coefficients respectively. Specifically, the computer readable storage medium includes, but is not limited to, for example, a volatile memory and / or a non-volatile memory. The volatile memory may include a random access memory (RAM) and / or a cache memory (cache), etc. The non-volatile memory may include a read-only memory (ROM), a hard disk, a flash memory, an optical disk, a magnetic disk, etc.

[0058] Those skilled in the art will appreciate that the embodiments of the present application may be provided as methods, systems, or computer program products. Therefore, the present application may adopt the form of a complete hardware embodiment, a complete software embodiment, or an embodiment in combination with software and hardware. Moreover, the present application may adopt the form of a computer program product implemented in one or more computer-usable storage media (including but not limited to disk storage, CD-ROM, optical storage, etc.) that include computer-usable program code.

[0059] The present application is described with reference to the flowcharts and / or block diagrams of the methods, devices (systems), and computer program products according to the embodiments of the present application. It should be understood that each process and / or box in the flowchart and / or block diagram, as well as the combination of the processes and / or boxes in the flowchart and / or block diagram, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, a special-purpose computer, an embedded processor, or other programmable data processing device to generate a machine, so that the instructions executed by the processor of the computer or other programmable data processing device generate instructions for implementing the processes in the flowchart and / or block diagram. Figure 1 A process or multiple processes and / or boxes Figure 1 A device that provides the functions specified in a block or multiple blocks.

[0060] These computer program instructions may also be stored in a computer-readable memory capable of directing a computer or other programmable data processing device to operate in a specific manner, so that the instructions stored in the computer-readable memory produce an article of manufacture comprising an instruction device, which implements the process Figure 1 A process or multiple processes and / or boxes Figure 1 A function specified in one or more boxes.

[0061] These computer program instructions can also be loaded onto a computer or other programmable data processing device so that a series of operating steps are executed on the computer or other programmable device to produce a computer-implemented process, thereby providing instructions for implementing the process. Figure 1 A process or multiple processes and / or boxes Figure 1 The steps for the functions specified in one or more boxes.

[0062] Those skilled in the art will readily appreciate other embodiments of the present invention after considering the specification and disclosure of the invention. This application is intended to cover any variations, uses or adaptations of the present invention that follow the general principles of the present invention and include common knowledge or customary techniques in the art that are not disclosed by the present invention. The specification and examples are to be considered exemplary only, and the true scope and spirit of the present invention are indicated by the following claims.

[0063] It should be understood that the present invention is not limited to the exact construction that has been described above and shown in the drawings and that various modifications and changes may be made without departing from the scope thereof. The scope of the present invention is limited only by the appended claims.

[0064] The above description is only a preferred embodiment of the present invention and does not limit the present invention in any way. Any simple modification, change and equivalent structural change made to the above embodiment based on the technical essence of the present invention still falls within the protection scope of the technical solution of the present invention.

Claims

1. A thermal power plant wastewater pH automatic adjustment device, characterized in that: It comprises a water supply pipeline, a first water inlet electric valve (1), a first neutralization tank, a dosing metering pump (14), a first neutralization tank dosing electric valve (15), a first water return electric valve (4), a sampling electromagnetic valve (11), a water outlet pipeline and a self-cleaning online pH monitoring instrument (13); The outlet of the incoming water pipeline is connected to the inlet of the first neutralization tank via the first water inlet electric valve (1), the outlet of the dosing metering pump (14) is connected to the first neutralization tank via the first neutralization tank dosing electric valve (15), a first cyclone stirring device (5) is arranged in the first neutralization tank, and the outlet of the first neutralization tank is divided into three routes via the first circulating water pump (2), wherein the first route is connected to the first cyclone stirring device (5) via the first water return electric valve (4), the second route is connected to the inlet of the sampling electromagnetic valve (11), the third route is connected to the water outlet pipeline via the first water outlet electric valve (3), and the outlet of the sampling electromagnetic valve (11) is connected to the self-cleaning online pH monitoring instrument (13) via the sampling flowmeter (12).

2. The automatic pH regulating device for wastewater from a thermal power plant according to claim 1, characterized in that: The invention also comprises a second neutralization tank, wherein the outlet of the incoming water pipeline is connected to the inlet of the second neutralization tank via a second water inlet electric valve (6), the outlet of the dosing metering pump (14) is connected to the second neutralization tank via a second neutralization tank dosing electric valve (16), a second cyclone stirring device (10) is arranged in the second neutralization tank, and the outlet of the second neutralization tank is divided into three paths after passing through a second circulating water pump (7), wherein the first path is connected to the second cyclone stirring device (10) via a second water return electric valve (9), the second path is connected to the inlet of a sampling electromagnetic valve (11), and the third path is connected to the water outlet pipeline via a second water outlet electric valve (8).

3. The automatic pH regulating device for wastewater from a thermal power plant according to claim 2, characterized in that: The first cyclone stirring device (5) and the second cyclone stirring device (10) are metal spiral structures.

4. The automatic pH regulating device for wastewater from a thermal power plant according to claim 1, characterized in that: The self-cleaning on-line pH monitoring instrument (13) is equipped with corrosion-resistant electrodes.

5. The automatic pH regulating device for wastewater from a thermal power plant according to claim 1, characterized in that: The dosing metering pump (14) is a mechanical diaphragm pump.

6. The automatic pH regulating device for wastewater from a thermal power plant according to claim 2, characterized in that: The intelligent control system (17) is connected to a self-cleaning online pH monitoring instrument (13), a dosing metering pump (14), a first neutralization tank dosing electric valve (15), and a second neutralization tank dosing electric valve (16).

7. A method for automatically adjusting the pH value of wastewater from a thermal power plant, characterized in that: The automatic pH regulating device for wastewater from a thermal power plant according to claim 1 comprises the following steps: Obtaining a self-cleaning online pH monitoring instrument (13) to monitor the pH value of the wastewater; The frequency of the dosing metering pump (14) is controlled according to the pH value of the wastewater monitored by the self-cleaning online pH monitoring instrument (13).

8. The method for automatically adjusting the pH value of wastewater from a thermal power plant according to claim 7, characterized in that: When the pH value of the wastewater monitored by the self-cleaning online pH monitoring instrument (13) is less than 4, the frequency value of the dosing metering pump (14) is controlled to be greater than or equal to 45 Hz.

9. The method for automatically adjusting the pH value of wastewater from a thermal power plant according to claim 7, characterized in that: When the pH value of the wastewater monitored by the self-cleaning online pH monitoring instrument (13) is greater than or equal to 4 and less than 6.5, the frequency value Hz=k1*△pH+b of the dosing metering pump (14) is controlled, wherein k1 is the slope, △pH is the deviation value between the target pH and the current pH, and b is the offset.

10. The method for automatic pH adjustment of wastewater from a thermal power plant according to claim 7, characterized in that: When the pH value of the wastewater monitored by the self-cleaning online pH monitoring instrument (13) is greater than or equal to 6.5, the frequency value of the dosing metering pump (14) is controlled. Among them, e n is the deviation between the target pH and the current pH, T s is the sampling period, K p、 K i、 K d Represent the proportional, integral, and differential coefficients respectively.

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