A wastewater system control optimization method and system with constant smoke temperature and variable flow

Abstract

The present invention discloses a wastewater system control optimization method with constant flue gas temperature and variable flow rate, including collecting wastewater system data information by analyzing the flue gas temperature at the outlet of the wastewater evaporation tower; realizing automatic control of the wastewater flow rate in the full load section by optimizing the control function; and ensuring the flue gas flow rate passing through the wastewater tower by regulating and controlling the hot and cold flue gas. By selecting the flue gas temperature at the outlet of the wastewater evaporation tower as the controlled object and using a constant flue gas temperature and variable flow rate method, the wastewater treatment system can maintain the best treatment effect under different load conditions, reducing the treatment cost and solving the problem that the flue gas temperature at the outlet of the wastewater evaporation tower is unstable, which easily causes high exhaust gas temperature or insufficient evaporation of wastewater.

Description

Technical Field

[0001] The invention relates to the technical field of wastewater treatment and control, and in particular to a wastewater system control optimization method with constant smoke temperature and variable flow. Background Art

[0002] Wastewater treatment systems are usually designed to treat sewage according to specific process parameters and wastewater characteristics. These parameters include flow, pH, temperature and concentration, which usually need to be automatically or manually controlled to ensure the normal operation and efficient treatment of the system.

[0003] However, in actual applications, the wastewater treatment system may be affected by external factors, such as seasonal changes, raw material changes, and other environmental factors, which may cause changes in wastewater flow and flue gas temperature. If the wastewater treatment system is adjusted without control, the wastewater may not be effectively treated, causing environmental pollution and safety hazards. The system is equipped with a wastewater storage tank (reuse), and the wastewater is transported by a wastewater delivery pump through a stainless steel pipe, and then supplied to the rotary atomizer after passing through an adjusting gate. A process water flushing pipeline is also arranged on the delivery pipeline. The existing wastewater flow is only controlled by the unit load. The exhaust temperature is quite different under the same load, different coal types and working conditions, but the wastewater flow is the same. The disadvantage is that the flue gas temperature at the outlet of the wastewater evaporation tower is unstable, which can easily cause high exhaust gas temperature or insufficient evaporation of wastewater.

[0004] Therefore, in order to achieve an optimized wastewater treatment effect, a wastewater system control optimization method that can maintain a constant flue gas temperature and variable flow rate is needed, so as to maintain a constant wastewater flow rate and flue gas temperature under any circumstances. Summary of the invention

[0005] The purpose of this section is to summarize some aspects of embodiments of the present invention and briefly introduce some preferred embodiments. Some simplifications or omissions may be made in this section and the specification abstract and the invention title of this application to avoid blurring the purpose of this section, the specification abstract and the invention title, and such simplifications or omissions cannot be used to limit the scope of the present invention.

[0006] In view of the above existing problems, the present invention is proposed.

[0007] Therefore, the present invention provides a wastewater system control optimization method with constant flue gas temperature and variable flow, which can solve the problem that the flue gas temperature at the outlet of the wastewater evaporation tower is unstable, which may easily cause high exhaust gas temperature or insufficient wastewater evaporation.

[0008] In order to solve the above technical problems, the present invention provides the following technical solutions, a wastewater system control optimization method with constant smoke temperature and variable flow, comprising:

[0009] Collect wastewater system data information by analyzing the flue gas temperature at the outlet of the wastewater evaporation tower;

[0010] Through the optimization of control functions, automatic control of wastewater flow in full load section is realized;

[0011] By adjusting and controlling the hot and cold flue gases, the flue gas flow through the wastewater tower is guaranteed.

[0012] As a preferred solution of the wastewater system control optimization method with constant smoke temperature and variable flow described in the present invention, the preprocessing includes inputting multi-component seabed node data into the header keyword program, obtaining observation system information, and sorting out the common detection point data of the pressure component and the vertical velocity component.

[0013] As a preferred solution of the wastewater system control optimization method with constant flue gas temperature and variable flow rate described in the present invention, the flue gas temperature at the outlet of the wastewater evaporation tower includes the temperature and flow rate of the wastewater entering the evaporation tower, the temperature and flow rate of the heating medium in the evaporation tower, the pressure and humidity in the evaporation tower, the temperature distribution in the evaporation tower, and the structure and material of the wastewater evaporation tower.

[0014] As a preferred solution of the wastewater system control optimization method with constant flue gas temperature and variable flow rate described in the present invention, the wastewater system data information includes wastewater flow rate, wastewater temperature, flue gas flow rate, flue gas temperature and pollutant emission concentration.

[0015] As a preferred solution of the wastewater system control optimization method with constant smoke temperature and variable flow rate described in the present invention, the control function includes using a PID controller to realize automatic control of the wastewater flow rate, and the wastewater flow rate control function is expressed as:

[0016] u(t)=K p e(t)+K i ∫e(t)dt+K d *de(t) / dt

[0017] Where u(t) represents the control output at time t, e(t) represents the difference between the expected flow rate and the actual flow rate at time t, and K p Represents the coefficient of the proportional controller, K i represents the coefficient of the integral controller, K d Represents the coefficient of the derivative controller.

[0018] As a preferred solution of the wastewater system control optimization method with constant flue gas temperature and variable flow rate described in the present invention, the automatic control of the wastewater flow rate in the full load section includes: during the normal operation of the wastewater system, the electric regulating door of the spray tower main pipe is automatically controlled to control the wastewater flow rate entering the evaporation tower, and the target value changes automatically with the boiler load. The real-time wastewater flow rate is obtained by calculating the control function, and the PID controller is calculated based on the current error, error change rate and error accumulation to accurately control the flow rate. When the flue gas temperature at the outlet of the evaporation tower is higher than the target value, the wastewater flow rate is increased, and when it is lower than the target value, the wastewater flow rate is reduced, and the upper and lower limits of the increase and decrease are set to prevent over-adjustment, so as to make up for the design defect that only changes with the boiler load.

[0019] As a preferred solution of the wastewater system control optimization method with constant flue gas temperature and variable flow rate described in the present invention, wherein: the automatic control of the wastewater flow rate at full load also includes automatic control of hot and cold flue gas valves, stabilizing the inlet flue gas temperature according to the set value, adjusting the flue gas flow rate according to the function and feedback, comparing the target flue gas flow rate with the actual flue gas flow rate, and calculating the error between the two. When the error is positive, that is, the actual flue gas flow rate is lower than the target value, the feedback controller increases the flue gas flow rate by increasing the fan speed until the actual flue gas flow rate reaches the target value, so that the error becomes zero;

[0020] The outlet flue gas temperature is fed back and corrected, and the outlet flue gas temperature is fed back to the wastewater treatment system controller for adjustment and optimization control. When the outlet flue gas temperature is higher than the target value, the wastewater flow rate in the wastewater treatment process is increased; when the outlet flue gas temperature is lower than the target value, the wastewater flow rate in the wastewater treatment process is reduced.

[0021] As a preferred scheme of the wastewater system control optimization method with constant flue gas temperature and variable flow described in the present invention, the cold and hot flue gas regulation control includes adding flue gas at the air preheater outlet as the cold flue gas source, and the original air preheater inlet flue gas as the hot flue gas source. Due to insufficient pressure of the cold flue gas, a booster fan is required, and the flue gas flow at the wastewater tower inlet is taken as the regulated object. On the basis of not affecting the heat exchange efficiency of the air preheater, the flue gas flow is increased with the load, and a regulating valve is added to the cold and hot flue gas pipelines. The flue gas flow is controlled by the hot flue gas regulating valve, and the cold flue gas regulating valve stabilizes the inlet flue gas temperature, so as to ensure that the inlet flue gas temperature of the wastewater tower is constant, and the flue gas flow can change with the load according to the function.

[0022] Another object of the present invention is to provide a wastewater system control optimization method system with constant flue gas temperature and variable flow, which can simultaneously control the flue gas temperature and flow rate at the inlet of the wastewater tower, and the wastewater flow rate to ensure that the wastewater tower maintains operation under relatively stable working conditions, thereby solving the problems of low operating reliability and low economic effect of traditional solutions.

[0023] A system for a wastewater system control optimization method with constant smoke temperature and variable flow rate, characterized by comprising a sensor module, a PID control module, an actuator module, a monitoring interface, and a data storage and analysis module;

[0024] The sensor module monitors and records data information in the wastewater system in real time;

[0025] The PID control module controls the wastewater system by calculating the proportional, integral and differential parts of the error signal to achieve a constant smoke temperature and variable flow rate;

[0026] The actuator module adjusts the operating parameters of the wastewater treatment system according to the instructions of the PID control module;

[0027] The monitoring interface displays the real-time status of the wastewater system and provides parameter setting and operation functions for the controller and operators;

[0028] The data storage and analysis module stores the data collected by the sensor, analyzes and processes the data, and provides data support and reference for the optimization of the wastewater system.

[0029] A computer device comprises a memory and a processor, wherein the memory stores a computer program, and is characterized in that when the processor executes the computer program, steps of a wastewater system control optimization method with constant smoke temperature and variable flow are implemented.

[0030] A computer-readable storage medium having a computer program stored thereon, characterized in that when the computer program is executed by a processor, the steps of a wastewater system control optimization method with constant flue gas temperature and variable flow are implemented.

[0031] The beneficial effects of the present invention are as follows: targeted measures are taken by analyzing the instability of the flue gas temperature at the outlet of the wastewater evaporation tower, and the flue gas temperature at the outlet of the wastewater evaporation tower is selected as the controlled object; increasing the wastewater flow rate at high load effectively improves the economic benefits, and the wastewater tower inlet flue gas temperature, flue gas flow rate, and full-load section automatic control of the wastewater flow rate are achieved through control logic optimization, avoiding the tripping accident of the wastewater system caused by human error, and stabilizing the inlet flue gas temperature through hot and cold flue gas regulation and control, avoiding the flue gas temperature disturbance caused by rapid load changes. The flue gas flow rate passing through the wastewater tower is guaranteed by adding a fan, reducing the possibility of incomplete evaporation of wastewater due to too small flue gas flow rate. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following briefly introduces the drawings required for describing the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative labor. Among them:

[0033] Figure 1 A schematic flow chart of a wastewater system control optimization method with constant smoke temperature and variable flow provided by one embodiment of the present invention;

[0034] Figure 2 A line graph of a wastewater flow control function of a wastewater system control optimization method with constant smoke temperature and variable flow provided by an embodiment of the present invention;

[0035] Figure 3 A schematic diagram of newly added equipment in a wastewater system according to a wastewater system control optimization method with constant smoke temperature and variable flow provided by an embodiment of the present invention;

[0036] Figure 4 A wastewater flow control logic diagram of a wastewater system control optimization method with constant smoke temperature and variable flow provided by an embodiment of the present invention;

[0037] Figure 5 A schematic diagram of the working process of a wastewater system control optimization method with constant smoke temperature and variable flow provided by an embodiment of the present invention. DETAILED DESCRIPTION

[0038] In order to make the above-mentioned purposes, features and advantages of the present invention more obvious and easy to understand, the specific implementation methods of the present invention are described in detail below in conjunction with the drawings of the specification. Obviously, the described embodiments are part of the embodiments of the present invention, but not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary persons in the art without creative work should fall within the scope of protection of the present invention.

[0039] In the following description, many specific details are set forth to facilitate a full understanding of the present invention, but the present invention may also be implemented in other ways different from those described herein, and those skilled in the art may make similar generalizations without violating the connotation of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed below.

[0040] Secondly, the term "one embodiment" or "embodiment" as used herein refers to a specific feature, structure, or characteristic that may be included in at least one implementation of the present invention. The term "in one embodiment" that appears in different places in this specification does not necessarily refer to the same embodiment, nor does it refer to a separate or selective embodiment that is mutually exclusive with other embodiments.

[0041] The present invention is described in detail with reference to schematic diagrams. When describing the embodiments of the present invention, for the sake of convenience, the cross-sectional diagrams showing the device structure will not be partially enlarged according to the general scale, and the schematic diagrams are only examples, which should not limit the scope of protection of the present invention. In addition, in actual production, the three-dimensional dimensions of length, width and depth should be included.

[0042] At the same time, in the description of the present invention, it should be noted that the directions or positional relationships indicated by the terms "upper, lower, inner and outer" are based on the directions or positional relationships shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore cannot be understood as limiting the present invention. In addition, the terms "first, second or third" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance.

[0043] In the present invention, unless otherwise clearly specified and limited, the terms "install, connect, connect" should be understood in a broad sense, for example: it can be a fixed connection, a detachable connection or an integral connection; it can also be a mechanical connection, an electrical connection or a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0044] Example 1

[0045] Reference Figure 1 , Figure 2 and Figure 3 , which is the first embodiment of the present invention, provides a wastewater system control optimization method with constant smoke temperature and variable flow, comprising:

[0046] S1: Collect wastewater system data information by analyzing the flue gas temperature at the outlet of the wastewater evaporation tower.

[0047] Furthermore, the flue gas temperature at the outlet of the wastewater evaporation tower includes the temperature and flow rate of the wastewater entering the evaporation tower, the temperature and flow rate of the heating medium in the evaporation tower, the pressure and humidity in the evaporation tower, the temperature distribution in the evaporation tower, and the structure and material of the wastewater evaporation tower, and the wastewater system data information includes wastewater flow rate, wastewater temperature, flue gas flow rate, flue gas temperature and pollutant emission concentration.

[0048] S2: Automatic control of wastewater flow in full load section is achieved through optimization of control function.

[0049] Furthermore, the control function includes using a PID controller to realize automatic control of the wastewater flow rate, and the wastewater flow rate control function is expressed as:

[0050] u(t)=Kp e(t)+K i ∫e(t)dt+K d *de(t) / dt

[0051] Where u(t) represents the control output at time t, e(t) represents the error at time t, that is, the difference between the expected flow and the actual flow, K p Represents the coefficient of the proportional controller, K i represents the coefficient of the integral controller, K d Represents the coefficients of the differential controller, whose functions are to correct deviation, eliminate cumulative error and suppress overshoot.

[0052] Furthermore, the full-load automatic control of the wastewater flow includes, during the normal operation of the wastewater system, the electric regulating gate of the spray tower main pipe is automatically controlled to control the wastewater flow entering the evaporation tower, and the target value changes automatically with the boiler load. By adding a PID module with the outlet temperature of the wastewater evaporation tower as input, the wastewater flow is increased or decreased when the flue gas temperature at the outlet of the evaporation tower is higher or lower than the target value, and the upper and lower limits of the increase or decrease are set to prevent over-adjustment, thereby making up for the design defect that only changes with the boiler load.

[0053] It should be noted that the hot and cold flue gas valves are automatically controlled, the inlet flue gas temperature is stabilized according to the set value, the flue gas flow rate is adjusted according to the function and feedback, the target flue gas flow rate is compared with the actual flue gas flow rate, and the error between the two is calculated. When the error is positive, that is, the actual flue gas flow rate is lower than the target value, the feedback controller increases the flue gas flow rate by increasing the fan speed until the actual flue gas flow rate is close to the target value, so that the error becomes zero; the outlet flue gas temperature is feedback corrected, and the outlet flue gas temperature is fed back to the wastewater treatment system controller for adjustment and optimization control. When the outlet flue gas temperature is higher than the target value, the wastewater flow rate in the wastewater treatment process is increased, and when the outlet flue gas temperature is lower than the target value, the wastewater flow rate in the wastewater treatment process is reduced.

[0054] Furthermore, in order to control the wastewater flow rate to change with different working conditions, it is planned to take the flue gas temperature at the outlet of the wastewater evaporation tower as the controlled object, and increase or decrease the wastewater flow rate based on the original function. Due to different seasons, the wastewater temperature is also different. Even with the same flue gas temperature and flue gas flow, the amount of wastewater that can be evaporated in winter and summer is also different. Feedback correction through the outlet flue gas temperature can avoid the wastewater evaporation tower outlet flue gas temperature being too high, resulting in reduced economic benefits, or the wastewater evaporation tower outlet flue gas temperature being too low, resulting in incomplete evaporation of wastewater, and some water entering the ash hopper to cause dry ash to agglomerate, affecting the normal operation of the ash conveying system.

[0055] S3: Ensure the flue gas flow through the wastewater tower through hot and cold flue gas regulation and control.

[0056] Furthermore, the cold and hot flue gas regulation and control includes adding the air preheater outlet flue gas as the cold flue gas source, and the original air preheater inlet flue gas as the hot flue gas source. Due to insufficient pressure of the cold flue gas, a booster fan is required, and the flue gas flow rate at the wastewater tower inlet is taken as the regulated object. On the basis of not affecting the heat exchange efficiency of the air preheater, the flue gas flow rate is increased with the load, and a regulating valve is added to the cold and hot flue gas pipelines. The flue gas flow rate is controlled by the hot flue gas regulating valve, and the cold flue gas regulating valve stabilizes the inlet flue gas temperature to ensure that the inlet flue gas temperature of the wastewater tower is constant, and the flue gas flow rate can change with the load according to the function.

[0057] It should be noted that the hot and cold flue gas valves are automatically controlled to stabilize the inlet flue gas temperature according to the set value, and adjust the flue gas flow according to the function and feedback to ensure the stability of the flue gas flow through the wastewater tower, so that it better matches the energy required to evaporate the wastewater under the current load, and to ensure the economic benefits and safety of the wastewater tower as much as possible.

[0058] Example 2

[0059] Reference Figure 4 , which is an embodiment of the present invention, provides a wastewater system control optimization method with constant smoke temperature and variable flow rate. In order to verify the beneficial effects of the present invention, scientific demonstration is carried out through experiments.

[0060] According to the control logic diagram and the load value of the current working condition, F1(x) and F2(x) are analyzed. F1(x) is Figure 2 As shown, the F2(x) data is shown in Table 1:

[0061] Table 1

[0062]

[0063] The basic wastewater flow rate is obtained through F1(x) as input 1 of SUM. The outlet flue gas temperature set value is manually input and set to 140℃, because under the pressure of -0.07kpa in the furnace, this temperature is sufficient to evaporate the atomized wastewater. The outlet flue gas temperature set value and the actual value output an instruction through the PID module, which is limited to +2 to -1 through the H / L high and low limit range as input 2 of SUM. The sum of the two is used as the wastewater flow set value and the actual wastewater flow to control the wastewater valve opening through the PID output instruction.

[0064] The flue gas flow set value is obtained through F2(x), compared with the actual value of the flue gas flow, and the hot flue gas regulating valve is controlled through the PID module output instruction.

[0065] The inlet smoke temperature set value is artificially input to 300℃. Compared with the actual value of the inlet smoke temperature, the cold smoke inlet valve is controlled by the PID module output command. The comparison data is shown in Table 2:

[0066] Table 2

[0067]

[0068] The above table is the average of 6253 groups under each load section in two ways. From the data in the table, it can be seen that the wastewater treatment capacity of the wastewater system under each section is improved, especially in the high load section. At the full load of 600MW, the treatment capacity of the wastewater system is increased by about 20%, and the outlet flue gas temperature is further reduced. Under the premise of improving the wastewater treatment capacity, the economic benefits of the unit are also improved.

[0069] It should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit the present invention. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solutions of the present invention may be modified or replaced by equivalents without departing from the spirit and scope of the technical solutions of the present invention, which should all be included in the scope of the claims of the present invention.

[0070] Example 3

[0071] The third embodiment of the present invention is different from the first two embodiments in that:

[0072] If the functions are implemented in the form of software functional units and sold or used as independent products, they can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of the present invention, or the part that contributes to the prior art or the part of the technical solution, can be embodied in the form of a software product. The computer software product is stored in a storage medium, including several instructions for a computer device (which can be a personal computer, a server, or a network device, etc.) to perform all or part of the steps of the methods described in each embodiment of the present invention. The aforementioned storage medium includes: U disk, mobile hard disk, read-only memory (ROM, Read-Only Memory), random access memory (RAM, Random Access Memory), disk or optical disk, etc., which can store program codes.

[0073] The logic and / or steps represented in the flowchart or otherwise described herein, for example, can be considered as an ordered list of executable instructions for implementing logical functions, and can be embodied in any computer-readable medium for use by an instruction execution system, device or apparatus (such as a computer-based system, a system including a processor, or other system that can fetch instructions from an instruction execution system, device or apparatus and execute instructions), or in conjunction with such instruction execution systems, devices or apparatuses. For the purposes of this specification, "computer-readable medium" can be any device that can contain, store, communicate, propagate or transmit a program for use by an instruction execution system, device or apparatus, or in conjunction with such instruction execution systems, devices or apparatuses.

[0074] More specific examples of computer-readable media (a non-exhaustive list) include the following: an electrical connection with one or more wires (electronic device), a portable computer disk case (magnetic device), a random access memory (RAM), a read-only memory (ROM), an erasable and programmable read-only memory (EPROM or flash memory), an optical fiber device, and a portable compact disk read-only memory (CDROM). In addition, the computer-readable medium may even be a paper or other suitable medium on which the program is printed, since the program may be obtained electronically, for example, by optically scanning the paper or other medium, followed by editing, deciphering or, if necessary, processing in another suitable manner, and then stored in a computer memory.

[0075] It should be understood that the various parts of the present invention can be implemented by hardware, software, firmware or a combination thereof. In the above-mentioned embodiments, a plurality of steps or methods can be implemented by software or firmware stored in a memory and executed by a suitable instruction execution system. For example, if implemented by hardware, as in another embodiment, it can be implemented by any one of the following technologies known in the art or their combination: a discrete logic circuit having a logic gate circuit for implementing a logic function for a data signal, a dedicated integrated circuit having a suitable combination of logic gate circuits, a programmable gate array (PGA), a field programmable gate array (FPGA), etc.

[0076] Example 4

[0077] Reference Figure 5 , which is an embodiment of the present invention, provides a system for a wastewater system control optimization method with constant smoke temperature and variable flow, characterized in that it includes a sensor module, a PID control module, an actuator module, a monitoring interface, and a data storage and analysis module;

[0078] The sensor module monitors and records data information in the wastewater system in real time.

[0079] The PID control module controls the wastewater system by calculating the proportional, integral and differential parts of the error signal to achieve constant smoke temperature and variable flow.

[0080] The actuator module adjusts the operating parameters of the wastewater treatment system according to the instructions of the PID control module.

[0081] The monitoring interface displays the real-time status of the wastewater system and provides parameter setting and operation functions to the controller and operators.

[0082] The data storage and analysis module stores the data collected by the sensor, analyzes and processes the data, and provides data support and reference for the optimization of the wastewater system.

[0083] It should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit the present invention. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solutions of the present invention may be modified or replaced by equivalents without departing from the spirit and scope of the technical solutions of the present invention, which should all be included in the scope of the claims of the present invention.

Claims

1. A wastewater system control optimization method with constant flue gas temperature and variable flow, characterized by: include, Collect wastewater system data information by analyzing the flue gas temperature at the outlet of the wastewater evaporation tower; Through the optimization of control functions, automatic control of wastewater flow in full load section is realized; Through the hot and cold flue gas regulation control, the flue gas flow through the wastewater tower is guaranteed; The flue gas temperature at the outlet of the wastewater evaporation tower includes the temperature and flow rate of the wastewater entering the evaporation tower, the temperature and flow rate of the heating medium in the evaporation tower, the pressure and humidity in the evaporation tower, the temperature distribution in the evaporation tower, and the structure and material of the wastewater evaporation tower. The wastewater system data information includes the wastewater flow rate, wastewater temperature, flue gas flow rate, flue gas temperature and pollutant emission concentration; The control function includes using a PID controller to achieve automatic control of the wastewater flow rate. The wastewater flow rate control function is expressed as: u(t)=K p e(t)+K i ∫e(t)dt+K d *de(t) / dt Where u(t) represents the control output at time t, e(t) represents the difference between the expected flow rate and the actual flow rate at time t, and K p Represents the coefficient of the proportional controller, K i represents the coefficient of the integral controller, K d represents the coefficient of the derivative controller; The full-load section automatic control of the wastewater flow includes: in the normal operation of the wastewater system, the electric regulating door of the spray tower main pipe is automatically controlled to control the wastewater flow entering the evaporation tower, the target value changes automatically with the boiler load, and the real-time wastewater flow is obtained by calculating the control function. The PID controller calculates based on the current error, error change rate and error accumulation, and accurately controls the flow to increase the wastewater flow when the flue gas temperature at the evaporation tower outlet is higher than the target value, and reduce the wastewater flow when it is lower than the target value, and sets the upper and lower limits of the increase and decrease to prevent over-adjustment, so as to make up for the design defect that only changes with the boiler load; The full-load section automatic control of the wastewater flow also includes automatic control of the hot and cold flue gas valves, stabilizing the inlet flue gas temperature according to the set value, adjusting the flue gas flow according to the function and feedback, comparing the target flue gas flow with the actual flue gas flow, and calculating the error between the two. When the error is positive, that is, the actual flue gas flow is lower than the target value, the feedback controller increases the flue gas flow by increasing the fan speed until the actual flue gas flow reaches the target value, so that the error becomes zero; The outlet flue gas temperature is fed back to the wastewater treatment system controller for adjustment and optimization control. When the outlet flue gas temperature is higher than the target value, the wastewater flow rate in the wastewater treatment process is increased; when the outlet flue gas temperature is lower than the target value, the wastewater flow rate in the wastewater treatment process is reduced. The cold and hot flue gas regulation and control includes adding the flue gas at the air preheater outlet as the cold flue gas source, and the original air preheater inlet flue gas as the hot flue gas source. Due to insufficient pressure of the cold flue gas, a booster fan is required, and the flue gas flow at the wastewater tower inlet is taken as the regulated object. On the basis of not affecting the heat exchange efficiency of the air preheater, the flue gas flow is increased with the load, and a regulating valve is added to the cold and hot flue gas pipelines. The flue gas flow is controlled by the hot flue gas regulating valve, and the cold flue gas regulating valve stabilizes the inlet flue gas temperature, thereby ensuring that the inlet flue gas temperature of the wastewater tower is constant, and the flue gas flow can change with the load according to the function.

2. A system using the wastewater system control optimization method with constant flue gas temperature and variable flow rate as claimed in claim 1, characterized in that: Including sensor module, PID control module, actuator module, monitoring interface, data storage and analysis module; The sensor module monitors and records data information in the wastewater system in real time; The PID control module controls the wastewater system by calculating the proportional, integral and differential parts of the error signal to achieve a constant smoke temperature and variable flow rate; The actuator module adjusts the operating parameters of the wastewater treatment system according to the instructions of the PID control module; The monitoring interface displays the real-time status of the wastewater system and provides parameter setting and operation functions for the controller and operators; The data storage and analysis module stores the data collected by the sensor, analyzes and processes the data, and provides data support and reference for the optimization of the wastewater system.

3. A computer device comprising a memory and a processor, wherein the memory stores a computer program, characterized in that: When the processor executes the computer program, the steps of the method according to claim 1 are implemented.

4. A computer-readable storage medium having a computer program stored thereon, characterized in that: When the computer program is executed by a processor, the steps of the method described in claim 1 are implemented.

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