CN116835698A - Constant smoke temperature variable flow wastewater system control optimization method and system - Google Patents
Constant smoke temperature variable flow wastewater system control optimization method and system Download PDFInfo
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- 239000002351 wastewater Substances 0.000 title claims abstract description 158
- 239000000779 smoke Substances 0.000 title claims abstract description 79
- 238000000034 method Methods 0.000 title claims abstract description 53
- 238000005457 optimization Methods 0.000 title claims abstract description 30
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 claims abstract description 96
- 239000003546 flue gas Substances 0.000 claims abstract description 96
- 230000008020 evaporation Effects 0.000 claims abstract description 45
- 238000001704 evaporation Methods 0.000 claims abstract description 45
- 238000004065 wastewater treatment Methods 0.000 claims abstract description 21
- 230000033228 biological regulation Effects 0.000 claims abstract description 7
- 230000006870 function Effects 0.000 claims description 27
- 230000001105 regulatory effect Effects 0.000 claims description 15
- 230000001276 controlling effect Effects 0.000 claims description 11
- 230000008569 process Effects 0.000 claims description 11
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- 238000012544 monitoring process Methods 0.000 claims description 6
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- 238000013461 design Methods 0.000 claims description 3
- 238000009826 distribution Methods 0.000 claims description 3
- 239000003344 environmental pollutant Substances 0.000 claims description 3
- 238000010438 heat treatment Methods 0.000 claims description 3
- 239000000463 material Substances 0.000 claims description 3
- 231100000719 pollutant Toxicity 0.000 claims description 3
- 239000007921 spray Substances 0.000 claims description 3
- 230000000087 stabilizing effect Effects 0.000 claims description 3
- 238000009825 accumulation Methods 0.000 claims description 2
- 230000000694 effects Effects 0.000 abstract description 3
- 238000011369 optimal treatment Methods 0.000 abstract 1
- 238000011282 treatment Methods 0.000 abstract 1
- 239000007789 gas Substances 0.000 description 9
- 230000008901 benefit Effects 0.000 description 5
- 238000010586 diagram Methods 0.000 description 5
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- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 2
- 238000012935 Averaging Methods 0.000 description 1
- 102100029469 WD repeat and HMG-box DNA-binding protein 1 Human genes 0.000 description 1
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- 238000002474 experimental method Methods 0.000 description 1
- 230000009123 feedback regulation Effects 0.000 description 1
- 238000011010 flushing procedure Methods 0.000 description 1
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/02—Treatment of water, waste water, or sewage by heating
- C02F1/04—Treatment of water, waste water, or sewage by heating by distillation or evaporation
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/008—Control or steering systems not provided for elsewhere in subclass C02F
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- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05B—CONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS
- G05B11/00—Automatic controllers
- G05B11/01—Automatic controllers electric
- G05B11/36—Automatic controllers electric with provision for obtaining particular characteristics, e.g. proportional, integral, differential
- G05B11/42—Automatic controllers electric with provision for obtaining particular characteristics, e.g. proportional, integral, differential for obtaining a characteristic which is both proportional and time-dependent, e.g. P. I., P. I. D.
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2209/00—Controlling or monitoring parameters in water treatment
- C02F2209/38—Gas flow rate
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2209/00—Controlling or monitoring parameters in water treatment
- C02F2209/40—Liquid flow rate
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Abstract
The application discloses a control optimization method of a wastewater system with constant smoke temperature and variable flow, which comprises the steps of collecting data information of the wastewater system by analyzing the smoke temperature condition of an outlet of a wastewater evaporation tower; the full-load section automatic control of the wastewater flow is realized through the optimization of a control function; and the flow of the flue gas passing through the waste water tower is ensured by cold and hot flue gas regulation and control. By selecting the outlet smoke temperature of the wastewater evaporation tower as a controlled object and adopting a constant smoke temperature and flow rate changing mode, the wastewater treatment system can maintain the optimal treatment effect under different load conditions, the treatment cost is reduced, and the problems of high smoke discharge temperature or insufficient wastewater evaporation caused by unstable outlet smoke temperature of the wastewater evaporation tower are solved.
Description
Technical Field
The application relates to the technical field of wastewater treatment and control, in particular to a wastewater system control optimization method with constant smoke temperature variable flow.
Background
Wastewater treatment systems are generally designed to treat wastewater according to specific process parameters and wastewater characteristics. These parameters, including flow, pH, temperature, and concentration, etc., typically require automatic or manual control to ensure proper operation and efficient processing of the system.
However, in practice, wastewater treatment systems may be subject to 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 uncontrolled, the wastewater may not be treated effectively, thereby causing environmental pollution and safety hazards. The system is provided with a waste water storage tank (utilized old), and is conveyed by a waste water conveying pump through a stainless steel pipe and then is supplied to a rotary atomizer after passing through an adjusting door. And simultaneously arranging a process water flushing pipeline on the conveying pipeline. The existing wastewater flow is only controlled by the unit load, and the discharge temperatures of the wastewater are greatly different under the same load, different coal types and working conditions, but the wastewater flow is the same, and the defects are that the outlet smoke temperature of the wastewater evaporation tower is unstable, and the conditions of high smoke discharge temperature, insufficient wastewater evaporation and the like are easily caused.
Therefore, in order to achieve an optimized wastewater treatment effect, there is a need for a wastewater system control optimization method capable of constant flow of flue gas temperature so as to be able to maintain a constant flow of wastewater and flue gas temperature in any case.
Disclosure of Invention
This section is intended to outline some aspects of embodiments of the application and to briefly introduce some preferred embodiments. Some simplifications or omissions may be made in this section as well as in the description of the application and in the title of the application, which may not be used to limit the scope of the application.
The present application has been made in view of the above-described problems occurring in the prior art.
Therefore, the application provides a control optimization method for a wastewater system with constant smoke temperature and variable flow, which can solve the problems that the smoke temperature at the outlet of a wastewater evaporation tower is unstable, the smoke temperature is high or the wastewater evaporation is insufficient, and the like.
In order to solve the technical problems, the application provides the following technical scheme, namely a method for optimizing the control of a constant smoke temperature variable flow wastewater system, which comprises the following steps:
collecting data information of a wastewater system by analyzing the smoke temperature condition of an outlet of the wastewater evaporation tower;
the full-load section automatic control of the wastewater flow is realized through the optimization of a control function;
and the flow of the flue gas passing through the waste water tower is ensured by cold and hot flue gas regulation and control.
As a preferable scheme of the wastewater system control optimization method with constant smoke temperature and variable flow rate, the application comprises the following steps: the preprocessing comprises the steps of inputting multi-component submarine node data into a track head keyword program, acquiring observation system information, and sorting out common-detector gather data of a pressure component and a vertical speed component.
As a preferable scheme of the wastewater system control optimization method with constant smoke temperature and variable flow rate, the application comprises the following steps: the flue gas temperature condition at the outlet of the wastewater evaporation tower comprises the temperature and flow of wastewater entering the evaporation tower, the temperature and flow of a heating medium in the evaporation tower, the pressure and humidity in the evaporation tower, the temperature distribution condition in the evaporation tower and the structure and materials of the wastewater evaporation tower.
As a preferable scheme of the wastewater system control optimization method with constant smoke temperature and variable flow rate, the application comprises the following steps: the wastewater system data information comprises wastewater flow, wastewater temperature, flue gas flow, flue gas temperature and pollutant emission concentration.
As a preferable scheme of the wastewater system control optimization method with constant smoke temperature and variable flow rate, the application comprises the following steps: the control function comprises the following steps of realizing automatic control of the wastewater flow by adopting a PID controller, wherein the wastewater flow 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 desired flow and the actual flow at time t, K p Representing the coefficients of the proportional controller, K i Representing an integral controllerCoefficient, K d Representing the coefficients of the derivative controller.
As a preferable scheme of the wastewater system control optimization method with constant smoke temperature and variable flow rate, the application comprises the following steps: the full-load section automatic control of the waste water flow comprises automatic control of throwing of an electric regulating door of a main pipe of a spray tower in normal operation of a waste water system, controlling the waste water flow entering an evaporation tower, wherein a target value automatically changes along with the load of the boiler, calculating real-time waste water flow through calculation of a control function, calculating based on the current error, the error change rate and the error accumulation by a PID controller, accurately controlling the flow, increasing the waste water flow when the smoke temperature at an outlet of the evaporation tower is higher than the target value and lower than the target value, reducing the waste water flow, setting the upper limit and the lower limit of the increment amount to prevent overshoot, and compensating the design defect only changing along with the load of the boiler.
As a preferable scheme of the wastewater system control optimization method with constant smoke temperature and variable flow rate, the application comprises the following steps: the automatic control of the wastewater flow full-load section further comprises automatic control of cold and hot flue gas valve switching, stable inlet flue gas temperature according to a set value, flue gas flow adjustment according to a function and feedback, comparison of target flue gas flow and actual flue gas flow, calculation of error between the target flue gas flow and the actual flue gas flow, and when the error is positive, namely the actual flue gas flow is lower than a target value, the feedback controller increases the flue gas flow by increasing the rotating speed of a fan until the actual flue gas flow reaches the target value, so that the error becomes zero;
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 a target value, the wastewater flow in the wastewater treatment process is increased, and when the outlet flue gas temperature is lower than the target value, the wastewater flow in the wastewater treatment process is reduced.
As a preferred scheme of the control optimization method of the constant smoke temperature variable flow waste water system, the control of the cold and hot smoke comprises the steps of adding the outlet smoke of the air preheater as a cold smoke air source, adding a booster fan as well as the inlet smoke flow of the waste water tower as a regulated object due to insufficient cold smoke pressure, adding a smoke flow along with the load on the basis of not affecting the heat exchange efficiency of the air preheater, adding a regulating gate on a cold and hot smoke pipeline, controlling the smoke flow through the hot smoke regulating gate, stabilizing the inlet smoke temperature by the cold smoke regulating gate, ensuring the constant smoke temperature of the inlet smoke of the waste water tower, and changing the smoke flow along with the load according to a function.
The application further aims to provide a wastewater system control optimization method system with constant smoke temperature and variable flow, which can ensure that a wastewater tower keeps running under a relatively stable working condition by simultaneously controlling the smoke temperature and the flow of an inlet of the wastewater tower, and solves the problems of low running reliability and low economic effect of the traditional scheme.
A system for a constant smoke temperature variable flow wastewater system control optimization method is characterized in that: the system comprises a sensor module, a PID control module, an actuator module, a monitoring interface and a data storage and analysis module;
the sensor module monitors and records data information in the wastewater system in real time;
the PID control module is used for controlling the wastewater system by calculating the proportion, integral and differential parts of the error signal to realize constant smoke temperature variation flow;
the executor module is used for adjusting the operation parameters of the wastewater treatment system according to the instruction of the PID control module;
the monitoring interface displays the real-time state of the wastewater system and provides parameter setting and operation functions for a controller and operators;
the data storage and analysis module stores the data acquired by the sensor, analyzes and processes the data, and provides data support and reference for the optimization of the wastewater system.
A computer device comprising a memory and a processor, said memory storing a computer program, characterized in that said processor, when executing said computer program, implements the steps of a method for optimizing the control of a wastewater system of constant smoke temperature flow.
A computer readable storage medium having stored thereon a computer program, characterized in that the computer program when executed by a processor realizes the steps of a method for optimizing the control of a wastewater system of constant smoke temperature variable flow.
The application has the beneficial effects that: taking targeted measures by analyzing the instability of the outlet smoke temperature of the wastewater evaporation tower, and selecting the outlet smoke temperature of the wastewater evaporation tower as a controlled object; the waste water flow is increased during high load, so that economic benefit is effectively improved, the inlet smoke temperature and the smoke flow of the waste water tower are realized through control logic optimization, the waste water flow full-load section automatic control is realized, tripping accidents of a waste water system caused by manual misoperation are avoided, the inlet smoke temperature is stabilized through cold and hot smoke regulation control, and smoke discharge temperature disturbance caused by rapid load change is avoided. And the fan is additionally arranged to ensure the flow of the flue gas passing through the waste water tower, so that the possibility of incomplete evaporation of the waste water caused by too small flow of the flue gas is reduced.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings that are needed in the description of the embodiments will be briefly described below, it being obvious that the drawings in the following description are only some embodiments of the present application, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art. Wherein:
FIG. 1 is a schematic flow diagram of a method for optimizing control of a wastewater system with constant smoke temperature and variable flow rate according to an embodiment of the present application;
FIG. 2 is a plot of wastewater flow control functions for a constant smoke temperature variable flow wastewater system control optimization method according to one embodiment of the present application;
FIG. 3 is a schematic diagram of a new apparatus for optimizing the control of a wastewater system with constant smoke temperature flow rate according to an embodiment of the present application;
FIG. 4 is a logic diagram of wastewater flow control for a constant smoke temperature variable flow wastewater system control optimization method according to one embodiment of the present application;
fig. 5 is a schematic diagram of a workflow of a wastewater system control optimization method system with constant smoke temperature flow rate according to an embodiment of the present application.
Detailed Description
So that the manner in which the above recited objects, features and advantages of the present application can be understood in detail, a more particular description of the application, briefly summarized above, may be had by reference to the embodiments, some of which are illustrated in the appended drawings. All other embodiments, which can be made by one of ordinary skill in the art based on the embodiments of the present application without making any inventive effort, shall fall within the scope of the present application.
In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present application, but the present application may be practiced in other ways other than those described herein, and persons skilled in the art will readily appreciate that the present application is not limited to the specific embodiments disclosed below.
Further, reference herein to "one embodiment" or "an embodiment" means that a particular feature, structure, or characteristic can be included in at least one implementation of the application. The appearances of the phrase "in one embodiment" in various places in the specification are not necessarily all referring to the same embodiment, nor are separate or alternative embodiments mutually exclusive of other embodiments.
While the embodiments of the present application have been illustrated and described in detail in the drawings, the cross-sectional view of the device structure is not to scale in the general sense for ease of illustration, and the drawings are merely exemplary and should not be construed as limiting the scope of the application. In addition, the three-dimensional dimensions of length, width and depth should be included in actual fabrication.
Also in the description of the present application, it should be noted that the orientation or positional relationship indicated by the terms "upper, lower, inner and outer", etc. are based on the orientation or positional relationship shown in the drawings, are merely for convenience of describing the present application and simplifying the description, and do not indicate or imply that the apparatus or elements referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as limiting the present application. Furthermore, the terms "first, second, or third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
The terms "mounted, connected, and coupled" should be construed broadly in this disclosure unless otherwise specifically indicated and defined, such as: can be fixed connection, detachable connection or integral connection; it may also be a mechanical connection, an electrical connection, or a direct connection, or may be indirectly connected through an intermediate medium, or may be a communication between two elements. The specific meaning of the above terms in the present application will be understood in specific cases by those of ordinary skill in the art.
Example 1
Referring to fig. 1, 2 and 3, a first embodiment of the present application provides a method for optimizing control of a wastewater system with constant smoke temperature and flow rate, comprising:
s1: and collecting data information of the wastewater system by analyzing the smoke temperature condition at the outlet of the wastewater evaporation tower.
Still further, the exhaust gas temperature condition of the exhaust gas evaporation tower comprises the temperature and flow rate of the exhaust gas entering the evaporation tower, the temperature and flow rate of a heating medium in the evaporation tower, the pressure and humidity in the evaporation tower, the temperature distribution condition in the evaporation tower and the structure and materials of the exhaust gas evaporation tower, and the exhaust gas system data information comprises the exhaust gas flow rate, the exhaust gas temperature, the exhaust gas flow rate, the exhaust gas temperature and the pollutant emission concentration.
S2: and the automatic control of the full-load section of the wastewater flow is realized through the optimization of the control function.
Still further, the control function includes that a PID controller is used to realize automatic control of the wastewater flow, and the wastewater flow 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 error at time t, i.e. the difference between the desired flow and the actual flow, K p Representing the coefficients of the proportional controller, K i Representing the coefficients of the integral controller, K d The coefficients representing the differential controller function to correct the bias, eliminate the accumulated error, and suppress the overshoot, respectively.
Furthermore, the automatic control of the full-load section of the wastewater flow comprises automatic control of the electric regulating gate of the main pipe of the spray tower in normal operation of the wastewater system, and the control of the wastewater flow entering the evaporation tower, wherein the target value automatically changes along with the load of the boiler. By adding a PID module taking the outlet temperature of the waste water evaporation tower as input, the waste water flow is increased and decreased when the outlet smoke temperature of the evaporation tower is higher than a target value or lower than the target value, and the upper limit and the lower limit of the increase and decrease are set to prevent overshoot, so that the design defect that the waste water evaporation tower only fluctuates with the load of the boiler is overcome.
It should be noted that, the automatic control of cold and hot flue gas valve switching, the steady entry flue gas temperature according to the set point, according to the function and the feedback regulation flue gas flow, the target flue gas flow is compared with actual flue gas flow, and calculate the error between the two, when the error is positive, namely the actual flue gas flow is lower than the target value, the feedback controller increases the flue gas flow by increasing the fan rotational speed, until the actual flue gas flow is close to the target value, make the error become zero; 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 a target value, the wastewater flow in the wastewater treatment process is increased, and when the outlet flue gas temperature is lower than the target value, the wastewater flow in the wastewater treatment process is reduced.
Furthermore, in order to control the flow of the wastewater to change along with different working conditions, the temperature of the smoke at the outlet of the wastewater evaporation tower is taken as a controlled object, and the flow of the wastewater is increased or decreased based on the original function. Because the seasons are different, the temperature of the waste water is also different, even if the same flue gas temperature and flue gas flow are different from the amount of the waste water which can be evaporated in winter and summer, the economic benefit reduction caused by the overhigh flue gas temperature of the outlet of the waste water evaporation tower can be avoided by carrying out feedback correction on the outlet flue gas temperature, or the incomplete evaporation of the waste water caused by the overlow flue gas temperature of the outlet of the waste water evaporation tower is avoided, and part of water enters an ash bucket to cause dry ash agglomeration, so that the normal operation of an ash conveying system is influenced.
S3: and the flow of the flue gas passing through the waste water tower is ensured by cold and hot flue gas regulation and control.
Furthermore, the cold and hot flue gas regulation control comprises the steps of adding air preheater outlet flue gas as a cold flue gas source, adding booster fan as an inlet flue gas of the original air preheater as a hot flue gas source, adding a flue gas flow of the inlet of the waste water tower as a regulated object on the basis of not influencing the heat exchange efficiency of the air preheater, adding a regulating gate on a cold and hot flue gas pipeline, controlling the flue gas flow through the hot flue gas regulating gate, stabilizing the inlet flue gas temperature of the cold flue gas regulating gate, ensuring that the inlet flue gas temperature of the waste water tower is constant, and changing the flue gas flow along with the load according to a function.
It should be noted that, automatic control is thrown to cold and hot flue gas transfer gate, stabilizes entry flue gas temperature according to the setting value, adjusts the flue gas flow according to function and feedback, ensures the flue gas flow stability through the waste water tower, makes it more match the energy that the evaporation waste water required under the current load, guarantees economic benefits and the security of waste water tower as far as possible.
Example 2
Referring to fig. 4, for one embodiment of the present application, a method for optimizing control of a constant smoke temperature variable flow wastewater system is provided, and in order to verify the beneficial effects of the present application, scientific demonstration is performed through experiments.
F is analyzed by a control logic diagram and according to the load value of the current working condition 1 (x) And F is equal to 2 (x)，F 1 (x) As shown in FIG. 2, F 2 (x) The data are shown in table 1:
TABLE 1
Through F 1 (x) The basic wastewater flow is obtained as input 1 to the SUM. The outlet flue gas temperature set point is manually entered at 140 ℃, as this temperature is sufficient to vaporize the atomized wastewater at a furnace pressure of-0.07 kpa. The outlet smoke temperature set value and the actual value output a command through the PID module, and the command is limited between +2 and-1 through the H/L high and low limit range to be used as input 2 of SUM. The sum of the two is used as the flow of waste waterThe set value of (2) and the wastewater flow actually control the wastewater gate opening through PID output instructions.
Through F 2 (x) And obtaining a flue gas flow set value, and comparing the flue gas flow set value with an actual flue gas flow value, and outputting an instruction to control a hot flue gas valve through a PID module.
The set value of the inlet smoke temperature is manually input to be 300 ℃, compared with the actual value of the inlet smoke temperature, the PID module outputs instructions to control the refrigerating smoke inlet gate adjustment, and the comparison data are shown in table 2:
TABLE 2
The table is obtained by averaging 6253 groups under each load section in two ways, and the data in the table can show that the wastewater treatment capacity of the wastewater system under each conforming section is improved, particularly, the wastewater treatment capacity of the wastewater system is improved by about 20% under the condition of 600MW full load especially under the high load section, and meanwhile, the outlet smoke temperature is further reduced, so that the economic benefit of the unit is also improved on the premise of improving the wastewater treatment capacity.
It should be noted that the above embodiments are only for illustrating the technical solution of the present application and not for limiting the same, and although the present application has been described in detail with reference to the preferred embodiments, it should be understood by those skilled in the art that modifications and equivalents may be made thereto without departing from the spirit and scope of the technical solution of the present application, which is intended to be covered by the scope of the claims of the present application.
Example 3
A third embodiment of the present application, which is different from the first two embodiments, is:
the functions, if implemented in the form of software functional units and sold or used as a stand-alone product, may be stored in a computer-readable storage medium. Based on this understanding, the technical solution of the present application may be embodied essentially or in a part contributing to the prior art or in a part of the technical solution, in the form of a software product stored in a storage medium, comprising several instructions for causing a computer device (which may be a personal computer, a server, a network device, etc.) to perform all or part of the steps of the method according to the embodiments of the present application. And the aforementioned storage medium includes: a U-disk, a removable hard disk, a Read-only memory (ROM), a random access memory (RAM, random Access Memory), a magnetic disk, or an optical disk, or other various media capable of storing program codes.
Logic and/or steps represented in the flowcharts or otherwise described herein, e.g., a ordered listing of executable instructions for implementing logical functions, can be embodied in any computer-readable medium for use by or in connection with an instruction execution system, apparatus, or device, such as a computer-based system, processor-containing system, or other system that can fetch the instructions from the instruction execution system, apparatus, or device and execute the instructions. For the purposes of this description, a "computer-readable medium" can be any means that can contain, store, communicate, propagate, or transport the program for use by or in connection with the instruction execution system, apparatus, or device.
More specific examples (a non-exhaustive list) of the computer-readable medium would include the following: an electrical connection (electronic device) having one or more wires, a portable computer diskette (magnetic device), a Random Access Memory (RAM), a read-only memory (ROM), an erasable programmable read-only memory (EPROM or flash memory), an optical fiber device, and a portable compact disc read-only memory (CDROM). In addition, the computer readable medium may even be paper or other suitable medium on which the program is printed, as the program may be electronically captured, via, for instance, optical scanning of the paper or other medium, then compiled, interpreted or otherwise processed in a suitable manner, if necessary, and then stored in a computer memory.
It is to be understood that portions of the present application may be implemented in hardware, software, firmware, or a combination thereof. In the above-described embodiments, the various steps or methods may be implemented in software or firmware stored in a memory and executed by a suitable instruction execution system. For example, if implemented in hardware, as in another embodiment, may be implemented using any one or combination of the following techniques, as is well known in the art: discrete logic circuits having logic gates for implementing logic functions on data signals, application specific integrated circuits having suitable combinational logic gates, programmable Gate Arrays (PGAs), field Programmable Gate Arrays (FPGAs), and the like.
Example 4
Referring to fig. 5, for one embodiment of the present application, a system for optimizing control of a constant smoke temperature variable flow wastewater system is provided, wherein: the system comprises a sensor module, a PID control module, an actuator module, a monitoring interface and a data storage and analysis module;
the sensor module monitors and records data information in the wastewater system in real time.
And the PID control module is used for controlling the wastewater system by calculating the proportion, the integral and the differential parts of the error signal so as to realize constant smoke temperature variation flow.
And the executor module is used for adjusting the operation parameters of the wastewater treatment system according to the instruction of the PID control module.
The monitoring interface displays the real-time state of the wastewater system and provides parameter setting and operation functions for a controller and operators.
The data storage and analysis module stores the data acquired by the sensor, analyzes and processes the data, and provides data support and reference for the optimization of the wastewater system.
It should be noted that the above embodiments are only for illustrating the technical solution of the present application and not for limiting the same, and although the present application has been described in detail with reference to the preferred embodiments, it should be understood by those skilled in the art that modifications and equivalents may be made thereto without departing from the spirit and scope of the technical solution of the present application, which is intended to be covered by the scope of the claims of the present application.
Claims (10)
1. A method for optimizing control of a wastewater system with constant smoke temperature variable flow is characterized by comprising the following steps: comprising the steps of (a) a step of,
collecting data information of a wastewater system by analyzing the smoke temperature condition of an outlet of the wastewater evaporation tower;
the full-load section automatic control of the wastewater flow is realized through the optimization of a control function;
and the flow of the flue gas passing through the waste water tower is ensured by cold and hot flue gas regulation and control.
2. The method for optimizing the control of a constant smoke temperature variable flow wastewater system according to claim 1, wherein the method comprises the following steps: the flue gas temperature condition at the outlet of the wastewater evaporation tower comprises the temperature and flow of wastewater entering the evaporation tower, the temperature and flow of a heating medium in the evaporation tower, the pressure and humidity in the evaporation tower, the temperature distribution condition in the evaporation tower and the structure and materials of the wastewater evaporation tower.
3. The method for optimizing the control of a constant smoke temperature variable flow wastewater system according to claim 2, wherein the method comprises the following steps: the wastewater system data information comprises wastewater flow, wastewater temperature, flue gas flow, flue gas temperature and pollutant emission concentration.
4. A method for optimizing control of a constant smoke temperature variable flow wastewater system as defined in claim 3, wherein: the control function comprises the following steps of realizing automatic control of the wastewater flow by adopting a PID controller, wherein the wastewater flow 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 desired flow and the actual flow at time t, K p Representing the coefficients of the proportional controller, K i Representing the coefficients of the integral controller, K d Representing the coefficients of the derivative controller.
5. The method for optimizing the control of a constant smoke temperature variable flow wastewater system according to claim 4, wherein the method comprises the following steps: the full-load section automatic control of the waste water flow comprises automatic control of throwing of an electric regulating door of a main pipe of a spray tower in normal operation of a waste water system, controlling the waste water flow entering an evaporation tower, wherein a target value automatically changes along with the load of the boiler, calculating real-time waste water flow through calculation of a control function, calculating based on the current error, the error change rate and the error accumulation by a PID controller, accurately controlling the flow, increasing the waste water flow when the smoke temperature at an outlet of the evaporation tower is higher than the target value and lower than the target value, reducing the waste water flow, setting the upper limit and the lower limit of the increment amount to prevent overshoot, and compensating the design defect only changing along with the load of the boiler.
6. The method for optimizing the control of a constant smoke temperature variable flow wastewater system according to claim 5, wherein the method comprises the following steps: the automatic control of the wastewater flow full-load section further comprises automatic control of cold and hot flue gas valve switching, stable inlet flue gas temperature according to a set value, flue gas flow adjustment according to a function and feedback, comparison of target flue gas flow and actual flue gas flow, calculation of error between the target flue gas flow and the actual flue gas flow, and when the error is positive, namely the actual flue gas flow is lower than a target value, the feedback controller increases the flue gas flow by increasing the rotating speed of a fan until the actual flue gas flow reaches the target value, so that the error becomes zero;
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 a target value, the wastewater flow in the wastewater treatment process is increased, and when the outlet flue gas temperature is lower than the target value, the wastewater flow in the wastewater treatment process is reduced.
7. The method for optimizing the control of a constant smoke temperature variable flow wastewater system according to claim 6, wherein the method comprises the following steps: the cold and hot flue gas regulation control comprises the steps of adding air preheater outlet flue gas as a cold flue gas source, adding a booster fan as an inlet flue gas of an original air preheater as a hot flue gas source, adding a flue gas flow of a waste water tower inlet as a regulated object on the basis of not influencing the heat exchange efficiency of the air preheater, adding a regulating gate on a cold and hot flue gas pipeline, controlling the flue gas flow through the hot flue gas regulating gate, stabilizing the inlet flue gas temperature of the cold flue gas regulating gate, ensuring that the inlet flue gas temperature of a waste water tower is constant, and changing the flue gas flow along with the load according to a function.
8. A system employing a constant smoke temperature variable flow wastewater system control optimization method according to any one of claims 1-7, characterized in that: the system comprises a sensor module, a PID control module, an actuator module, a monitoring interface and a data storage and analysis module;
the sensor module monitors and records data information in the wastewater system in real time;
the PID control module is used for controlling the wastewater system by calculating the proportion, integral and differential parts of the error signal to realize constant smoke temperature variation flow;
the executor module is used for adjusting the operation parameters of the wastewater treatment system according to the instruction of the PID control module;
the monitoring interface displays the real-time state of the wastewater system and provides parameter setting and operation functions for a controller and operators;
the data storage and analysis module stores the data acquired by the sensor, analyzes and processes the data, and provides data support and reference for the optimization of the wastewater system.
9. A computer device comprising a memory and a processor, the memory storing a computer program, characterized in that the processor implements the steps of the method of any of claims 1 to 7 when the computer program is executed.
10. A computer readable storage medium, on which a computer program is stored, characterized in that the computer program, when being executed by a processor, implements the steps of the method of any of claims 1 to 7.
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