CN120136332A - An automatic control system for raw water pretreatment system in thermal power plants - Google Patents
An automatic control system for raw water pretreatment system in thermal power plants Download PDFInfo
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- CN120136332A CN120136332A CN202510200836.4A CN202510200836A CN120136332A CN 120136332 A CN120136332 A CN 120136332A CN 202510200836 A CN202510200836 A CN 202510200836A CN 120136332 A CN120136332 A CN 120136332A
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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
- C02F9/00—Multistage treatment of water, waste water or sewage
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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
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/001—Processes for the treatment of water whereby the filtration technique is of importance
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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
- C02F1/52—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities
- C02F1/5281—Installations for water purification using chemical agents
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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
- C02F1/66—Treatment of water, waste water, or sewage by neutralisation; pH adjustment
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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
- C02F2209/02—Temperature
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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
- C02F2209/06—Controlling or monitoring parameters in water treatment pH
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- Life Sciences & Earth Sciences (AREA)
- Hydrology & Water Resources (AREA)
- Environmental & Geological Engineering (AREA)
- Water Supply & Treatment (AREA)
- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Automation & Control Theory (AREA)
- Separation Of Suspended Particles By Flocculating Agents (AREA)
Abstract
The invention discloses an automatic control system of a raw water pretreatment system of a thermal power plant. The system comprises an automatic input module, a water quantity automatic adjustment module, a water temperature automatic adjustment module, a mechanical accelerating clarification tank lime dosing automatic module, a mechanical accelerating clarification tank flocculating agent dosing automatic module, a mechanical accelerating clarification tank water outlet dosing automatic module, a mechanical accelerating clarification tank mud discharging automatic module, a mud concentrating tank mud discharging automatic module, a filter automatic module, a mechanical accelerating clarification tank first water inlet flow adjustment module and a mechanical accelerating clarification tank second water inlet flow adjustment module. According to the technical scheme, the full-automatic operation of the raw water pretreatment system can be realized, and the water yield is improved.
Description
Technical Field
The invention relates to the technical field of water treatment, in particular to an automatic control system of a raw water pretreatment system of a thermal power plant.
Background
Most of the existing thermal power plants adopt municipal reclaimed water as a water source for production, the quality hardness and alkalinity of the municipal reclaimed water are higher, a raw water pretreatment process of a mechanical acceleration clarifier and a filter is generally adopted, and medicines such as flocculating agents, lime and the like are added into the mechanical acceleration clarifier for removing suspended matters and hardness. The water filtered after the sulfuric acid is added into the water from the mechanical acceleration clarifier to reduce the pH value is used for the production water in factories.
The water quality of the effluent of the mechanical acceleration clarification tank is influenced by factors such as water yield change, water temperature change, dosing amount, sludge amount held in the tank and the like, and the water quality of the effluent is unstable, so that the phenomenon of tank turning is often caused. The water quantity of the mechanical acceleration clarification tank is influenced by the water quantity of the recovered water and the water quantity of the production water, when the water quantity suddenly increases to a large extent, the hydraulic load of the mechanical acceleration clarification tank is suddenly increased, mud in the tank moves upwards, and the discharged water is unqualified. When the temperature change of the inlet water is large, the pool can be turned over, and the outlet water is unqualified. When the dosage or the slurry amount in the tank is improper, the water outlet is unqualified. The filter needs to be backwashed periodically or according to the pressure difference of the filter, otherwise, the discharged water is failed.
Disclosure of Invention
The invention provides an automatic control system of a raw water pretreatment system of a thermal power plant, which can realize full-automatic operation of the raw water pretreatment system and improve the yield of discharged water.
According to one aspect of the invention, an automatic control system of a raw water pretreatment system of a thermal power plant is provided, the system comprises an automatic input module, a water quantity automatic regulation module, a water temperature automatic regulation module, a mechanical acceleration clarifier lime dosing automatic module, a mechanical acceleration clarifier flocculant dosing automatic module, a mechanical acceleration clarifier water outlet dosing automatic module, a mechanical acceleration clarifier mud discharge automatic module, a mud concentration tank mud discharge automatic module, a filter automatic module, a mechanical acceleration clarifier first water inlet flow regulation module and a mechanical acceleration clarifier second water inlet flow regulation module,
The automatic input module is used for controlling the operation of each device in the raw water pretreatment system;
The automatic water quantity adjusting module is used for controlling the opening of a water inlet valve of a mechanical acceleration clarification tank in the raw water pretreatment system;
The water temperature automatic adjusting module is used for controlling the opening of a water inlet valve of a mechanical acceleration clarification tank in the raw water pretreatment system;
the lime dosing automatic module of the mechanical acceleration clarification tank is used for controlling the lime dosing process of the mechanical acceleration clarification tank in the raw water pretreatment system;
The automatic flocculant dosing module of the mechanical acceleration clarification tank is used for controlling the flocculant dosing process of the mechanical acceleration clarification tank in the raw water pretreatment system;
The automatic module for adding the chemical into the water discharged from the mechanical acceleration clarification tank is used for controlling the chemical adding process of the water discharged from the mechanical acceleration clarification tank according to the acid-base number of the water discharged from the mechanical acceleration clarification tank in the raw water pretreatment system;
The mechanical acceleration clarification tank mud discharging automatic module is used for controlling the mud discharging process of the mechanical acceleration clarification tank in the raw water pretreatment system;
the sludge concentration tank sludge discharge automatic module is used for controlling the sludge discharge process of the sludge concentration tank in the raw water pretreatment system;
The filter automatic module is used for controlling the operation of a filter in the raw water pretreatment system;
The first water inflow flow regulating module of the mechanical acceleration clarification tank is used for regulating and controlling the water inflow flow of the mechanical acceleration clarification tank by utilizing PID according to the liquid level of the clean water tank in the raw water pretreatment system;
The second water inflow flow regulating module of the mechanical acceleration clarification tank is used for regulating and controlling the water inflow flow of the mechanical acceleration clarification tank by utilizing PID according to the liquid level of the recovery water tank in the raw water pretreatment system.
According to the technical scheme, the raw water pretreatment system is automatically controlled, so that the water yield of the raw water pretreatment system is improved, and the problem that the water yield of the raw water pretreatment system is unqualified is solved.
It should be understood that the description in this section is not intended to identify key or critical features of the embodiments of the invention or to delineate the scope of the invention. Other features of the present invention will become apparent from the description that follows.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for the description of the embodiments will be briefly described below, and it is apparent that the drawings in the following description are only some embodiments of the present invention, and other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
Fig. 1 is a schematic diagram of an automatic control system of a raw water pretreatment system of a thermal power plant according to a first embodiment of the present invention;
Fig. 2 is a schematic diagram of a raw water pretreatment system according to an embodiment of the present application.
Detailed Description
In order that those skilled in the art will better understand the present invention, a technical solution in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in which it is apparent that the described embodiments are only some embodiments of the present invention, not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the present invention without making any inventive effort, shall fall within the scope of the present invention.
It should be noted that the terms "first," "second," and the like in the description and the claims of the present invention and the above figures are used for distinguishing between similar objects and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used may be interchanged where appropriate such that the embodiments of the invention described herein may be implemented in sequences other than those illustrated or otherwise described herein. Furthermore, the terms "comprises," "comprising," and "having," and any variations thereof, are intended to cover a non-exclusive inclusion, such that a process, method, system, article, or apparatus that comprises a list of steps or elements is not necessarily limited to those steps or elements expressly listed but may include other steps or elements not expressly listed or inherent to such process, method, article, or apparatus.
Example 1
Fig. 1 is a schematic diagram of an automatic control system of a raw water pretreatment system of a thermal power plant according to an embodiment of the invention. As shown in fig. 1, the system comprises an automatic input module 101, a water quantity automatic adjustment module 102, a water temperature automatic adjustment module 103, a mechanical acceleration clarifier lime dosing automatic module 104, a mechanical acceleration clarifier flocculant dosing automatic module 105, a mechanical acceleration clarifier water outlet dosing automatic module 106, a mechanical acceleration clarifier sludge discharge automatic module 107, a sludge concentration tank sludge discharge automatic module 108, a filter automatic module 109, a mechanical acceleration clarifier first water inlet flow rate adjustment module 110 and a mechanical acceleration clarifier second water inlet flow rate adjustment module 111, wherein,
The automatic input module 101 is used for controlling the operation of each device in the raw water pretreatment system;
the water quantity automatic regulating module 102 is used for controlling the opening of a water inlet valve of a mechanical acceleration clarification tank in the raw water pretreatment system;
The water temperature automatic adjusting module 103 is used for controlling the opening of a water inlet valve of a mechanical acceleration clarification tank in the raw water pretreatment system;
The mechanical acceleration clarifier lime dosing automatic module 104 is used for controlling the lime dosing process of the mechanical acceleration clarifier in the raw water pretreatment system;
the automatic flocculant dosing module 105 of the mechanical acceleration clarification tank is used for controlling the flocculant dosing process of the mechanical acceleration clarification tank in the raw water pretreatment system;
The mechanical acceleration clarification tank water outlet dosing automatic module 106 is used for controlling the water outlet dosing process of the mechanical acceleration clarification tank according to the acid-base number of the water outlet of the mechanical acceleration clarification tank in the raw water pretreatment system;
The automatic sludge discharge module 107 of the mechanical acceleration clarification tank is used for controlling the sludge discharge process of the mechanical acceleration clarification tank in the raw water pretreatment system;
the sludge concentration tank sludge discharge automatic module 108 is used for controlling the sludge discharge process of the sludge concentration tank in the raw water pretreatment system;
the filter automatic module 109 is used for controlling the operation of a filter in the raw water pretreatment system;
the first inflow flow regulating module 110 of the mechanical acceleration clarification tank is used for regulating and controlling the inflow flow of the mechanical acceleration clarification tank by utilizing PID according to the liquid level of the clean water tank in the raw water pretreatment system;
The second inflow flow regulating module 111 of the mechanical acceleration clarification tank is used for regulating and controlling the inflow flow of the mechanical acceleration clarification tank by utilizing PID according to the liquid level of the recovery water tank in the raw water pretreatment system.
In this scheme, fig. 2 is a schematic diagram of a raw water pretreatment system according to a first embodiment of the present application, and as shown in fig. 2, the raw water pretreatment system includes a mechanically accelerated clarifier, a filter, a clean water tank, a sludge concentration tank, and a recovery water tank. Wherein, the number of the mechanical acceleration clarification tanks is 2-4, lime can be added in the first reaction zone of the mechanical acceleration clarification Chi Baohan first reaction zone and the second reaction zone of the mechanical acceleration clarification Chi Baohan first reaction zone, and the number of the filters is 3-10.
Specifically, the incoming water of the raw water pretreatment system firstly enters a mechanical acceleration clarification tank, a flocculating agent is added to an incoming water pipeline, and lime is added to a first reaction tank of the mechanical acceleration clarification tank. The mechanical acceleration clarifier needs to keep a certain amount of sludge in the reaction tank for contacting the incoming water to remove suspended matters and hardness in the water. After the sludge in the mechanical acceleration clarifier reaches a certain concentration, the sludge is required to be discharged to a sludge concentration tank through a bottom sludge discharge pipe. The middle part of the mechanical acceleration clarification tank is provided with a stirrer for stirring and refluxing the sludge at the bottom to the first reaction tank, so that the sludge is fully contacted with the incoming water. The bottom is provided with the mud scraper for scrape the bottom mud to central point put, do benefit to the mud discharge.
The sludge concentration tank is used for re-concentrating the sludge, reducing the water content of the sludge, and the sludge discharged from the bottom of the sludge concentration tank is generally conveyed to a desulfurization or sludge dewatering machine through a pump. The upper part overflows water to a recovery water pool.
Further, the mechanical acceleration clarifier effluent is added with sulfuric acid to reduce the pH value (Pondus Hydrogenii, acid-base) and then enters a filter, and the filter effluent is discharged to a clean water tank. The filter needs to be backwashed periodically.
The recovery water tank mainly collects backwash water of a filter, overflow water of a sludge concentration tank, sewage and flushing water of a dosing system and the like, the recovery water tank generally adopts liquid level control, and when the liquid level of the recovery water tank is higher, water is conveyed to a water inlet pipeline of the mechanical acceleration clarification tank through a pump. And when the liquid level is low, the conveying pump is automatically stopped.
In the embodiment, the automatic control system of the raw water pretreatment system of the thermal power plant is arranged, and the raw water pretreatment system is automatically controlled based on the automatic control system, so that the water yield of the raw water pretreatment system can be improved. Specifically, the automatic control system of the raw water pretreatment system of the thermal power plant comprises an automatic input module 101, a water quantity automatic regulation module 102, a water temperature automatic regulation module 103, a mechanical acceleration clarifier lime dosing automatic module 104, a mechanical acceleration clarifier flocculant dosing automatic module 105, a mechanical acceleration clarifier water outlet dosing automatic module 106, a mechanical acceleration clarifier sludge discharge automatic module 107, a sludge concentration tank sludge discharge automatic module 108, a filter automatic module 109, a mechanical acceleration clarifier first water inlet flow regulation module 110 and a mechanical acceleration clarifier second water inlet flow regulation module 111.
The automatic input module 101 is composed of buttons, and the buttons can be arranged on each mechanical acceleration clarifier, each filter, all water pumps and each dosing pump in the raw water pretreatment system and used for controlling the input and the output of each mechanical acceleration clarifier, each filter, all water pumps and each dosing pump in the raw water pretreatment system.
In this embodiment, the water amount automatic adjustment module 102 is configured to automatically control an opening of a water inlet valve of the mechanical acceleration clarifier according to a water inlet flow of the mechanical acceleration clarifier in the raw water pretreatment system. For example, the water inlet valve of the mechanical acceleration clarification tank can be opened gradually according to the water inlet flow of the mechanical acceleration clarification tank until the water inlet flow of the mechanical acceleration clarification tank reaches the set flow, the valve action is stopped, and the water inlet valve of the mechanical acceleration clarification tank can be opened according to the preset step type according to the water inlet flow of the mechanical acceleration clarification tank until the water inlet flow of the mechanical acceleration clarification tank reaches the set flow, and the valve action is stopped.
Optionally, the automatic water amount adjusting module 102 is specifically configured to:
acquiring the inflow of a mechanical acceleration clarifier in a raw water pretreatment system;
determining a target valve opening corresponding to the water inflow according to the water inflow;
And controlling the opening of a water inlet valve of the mechanical acceleration clarification tank according to the opening of the target valve.
The opening of the target valve can be set according to the water inflow of the mechanical acceleration clarification tank, so that the water inflow valve of the mechanical acceleration clarification tank is adjusted according to the opening of the target valve.
In the embodiment, by setting a flow input function, when the total flow to be processed of raw water pretreatment is input, the inflow water flow of the mechanical acceleration clarification tank which is put into an automatic function is increased to the set flow in an average step-by-step manner. Specifically, the water inflow of the mechanical acceleration clarification tank in the raw water pretreatment system is obtained, when a flow signal is input, the opening of the water inflow valve of the mechanical acceleration clarification tank is opened stepwise according to the corresponding flow, when one stepwise flow is reached, the next stepwise flow is stopped for a period of time until the flow reaches the position of the step of the set flow, or the opening of the water inflow valve of the mechanical acceleration clarification tank is set to be gradually opened, the opening speed is slow until the set flow is reached, and the valve action is stopped. Wherein the inflow is not affected by the regulation when the inflow is reduced.
In this scheme, the automatic water temperature adjusting module 103 is configured to control the opening of the water inlet valve of the mechanical acceleration clarifier according to the incoming water temperature in the raw water pretreatment system and the water temperature in the mechanical acceleration clarifier.
Optionally, the automatic water temperature adjusting module 103 is specifically configured to:
Acquiring the water temperature of incoming water in a raw water pretreatment system and the water temperature in a mechanical acceleration clarification tank;
And calculating a difference value between the water temperature of the incoming water and the water temperature in the mechanical acceleration clarification tank, and controlling the opening of a water inlet valve of the mechanical acceleration clarification tank according to the opening of a preset valve if the difference value meets a preset difference value condition.
The difference condition is used for limiting the difference between the water temperature of the incoming water and the water temperature in the mechanical acceleration clarification tank. When the difference between the water temperature of the incoming water and the water temperature in the mechanical acceleration clarification tank is smaller than or equal to the set value, the difference meets the preset difference condition, and when the difference between the water temperature of the incoming water and the water temperature in the mechanical acceleration clarification tank is smaller than or equal to the set value, the difference does not meet the preset difference condition.
Specifically, when the deviation between the water temperature of the incoming water and the water temperature in the mechanical acceleration clarification tank is larger than a set value, the water inlet valve of the mechanical acceleration clarification tank is gradually closed, the hydraulic load of the mechanical acceleration clarification tank is reduced, and therefore the influence of the water temperature on the water outlet of the mechanical acceleration clarification tank is reduced.
In this embodiment, when the deviation between the water temperature of the incoming water and the water temperature in the mechanical acceleration clarifier is less than or equal to the set value, the opening of the water inlet valve of the mechanical acceleration clarifier is not adjusted.
In this embodiment, the automatic lime dosing module 104 for the mechanically accelerated clarifier is used to control the lime dosing process of the mechanically accelerated clarifier in the raw water pretreatment system. Specifically, each mechanical acceleration clarifier corresponds to 1 lime dosing pump, establishes the coefficient relation of lime dosing pump frequency and mechanical acceleration clarifier inflow, when inflow increases, increases lime dosing pump frequency according to the coefficient. After the frequency of the lime dosing pump is increased, PID adjustment of the on-line pH meter and the frequency of the lime dosing pump is established, namely the frequency of the lime dosing pump is controlled by PID adjustment according to the pH meter in the mechanical acceleration clarifier. Wherein PID regulation (PID regulating) is a linear regulation law with proportional, integral and derivative actions.
Optionally, the mechanical acceleration clarifier lime dosing automation module 104 is specifically configured to:
acquiring a flow coefficient of the mechanical acceleration clarifier and a water inflow of the mechanical acceleration clarifier;
determining the frequency of a lime dosing pump according to the flow coefficient of the mechanical acceleration clarifier and the water inflow of the mechanical acceleration clarifier;
and according to the frequency of the lime dosing pump, utilizing PID to regulate and control the lime dosing process of the mechanical acceleration clarification tank.
In the scheme, the flow coefficient of the mechanical acceleration clarification tank and the water inflow of the mechanical acceleration clarification tank are multiplied, and the frequency of the lime dosing pump is calculated. And then, according to the frequency of the lime dosing pump, utilizing PID to regulate and control the lime dosing process of the mechanically accelerated clarification tank.
Specifically, lime dosing pump frequency=k1×q+pid adjustment, K1 is the mechanical acceleration clarifier flow coefficient, and q is the mechanical acceleration clarifier flow.
In this embodiment, the mechanical acceleration clarifier flow coefficient K1 is a fixed value. And determining the value of the flow coefficient K1 of the mechanical acceleration clarification tank according to the field debugging result, and manually correcting according to the requirement.
In this scheme, a mechanically accelerated clarifier flocculant dosing automation module 105 is used to control the flocculant dosing process of a mechanically accelerated clarifier in a raw water pretreatment system. Specifically, each mechanical acceleration clarifier corresponds to 1 flocculant dosing pump, a coefficient relation between the frequency of the flocculant dosing pump and the water inflow rate of the mechanical acceleration clarifier is established, and when the water inflow rate is increased, the frequency of the flocculant dosing pump is increased according to the coefficient. After the frequency of the flocculant dosing pump is increased, establishing PID (proportion integration differentiation) adjustment of an online pH meter and the frequency of the flocculant dosing pump, namely controlling the frequency of the flocculant dosing pump by utilizing PID adjustment according to the pH meter in the mechanical acceleration clarification tank.
Optionally, the mechanical acceleration clarifier flocculant dosing automatic module 105 is specifically configured to:
acquiring a flow coefficient of the mechanical acceleration clarifier and a water inflow of the mechanical acceleration clarifier;
calculating the frequency of a flocculant dosing pump according to the flow coefficient of the mechanical acceleration clarification tank and the water inflow of the mechanical acceleration clarification tank;
And (3) according to the frequency of the flocculant dosing pump, utilizing PID to regulate and control the flocculant dosing process of the mechanically accelerated clarification tank.
In the scheme, the flow coefficient of the mechanical acceleration clarification tank and the water inflow of the mechanical acceleration clarification tank are multiplied, and the frequency of a flocculant dosing pump is calculated. And then, according to the frequency of a flocculant dosing pump, utilizing PID to regulate and control the flocculant dosing process of the mechanically accelerated clarification tank.
Specifically, flocculant dosing pump frequency=k2×q+pid adjustment, K2 is a mechanical acceleration clarifier flow coefficient, and q is a mechanical acceleration clarifier flow.
In the scheme, the flow coefficient K2 of the mechanical acceleration clarification tank is a fixed value. And determining the value of the flow coefficient K2 of the mechanical acceleration clarification tank according to the field debugging result, and manually correcting according to the requirement.
In this scheme, the automatic module 106 for adding medicine to the water from the mechanical acceleration clarifier is used for controlling the water adding process of the mechanical acceleration clarifier according to the pH value of the water from the mechanical acceleration clarifier in the raw water pretreatment system. Specifically, a plurality of mechanical acceleration clarifiers water is gathered together in the form of a water outlet channel, and sulfuric acid dosing points are arranged in the water outlet main channel. The frequency of the sulfuric acid dosing pump and the pH meter establish a PID regulation relation. And when the pH value is low, the frequency of the sulfuric acid dosing pump is increased, and when the pH value is high, the frequency of the sulfuric acid dosing pump is reduced, so that the acid-base value of the effluent of the mechanical acceleration clarifier is adjusted.
In this embodiment, the sludge discharge automatic module 107 of the mechanical acceleration clarifier is configured to control the mechanical acceleration clarifier to discharge sludge according to the density of the water sample in the second reaction zone in the mechanical acceleration clarifier.
Optionally, the automatic mechanical acceleration clarifier sludge discharge module is specifically configured to:
acquiring the water sample density of a second reaction zone in the mechanical acceleration clarification tank;
And if the density of the water sample is larger than the preset water sample density value, controlling the mechanical acceleration clarifier to discharge mud.
The preset water sample density value can be set according to the water outlet quality requirement of the raw water pretreatment system of the thermal power plant. For example, a water sample density value of 1.08 may be set.
In the scheme, the water sample in the second reaction zone in the mechanical acceleration clarification tank is taken, an on-line densimeter is arranged, and the density of the water sample in the second reaction zone is measured. And when the density of the water sample is larger than a preset water sample density value, automatically starting a mud discharging program.
The densimeter is a common one of a plurality of mechanical acceleration clarifiers, and each mechanical acceleration clarifiers is used for measuring the density after being washed by clean water each time, and the measuring interval time of each mechanical acceleration clarifiers is not more than 30 minutes.
In this embodiment, the sludge thickener sludge discharge automatic module 108 is configured to control the sludge thickener to automatically discharge sludge according to the measured density of the mechanically accelerated clarifier.
Optionally, the sludge thickener sludge discharge automatic module 108 is specifically configured to:
obtaining the sludge discharge flow of the mechanical acceleration clarifier, the sludge discharge time of the mechanical acceleration clarifier, a first sludge discharge density, a second sludge discharge density, a water density and the water content of sludge in a sludge concentration tank, wherein the first sludge discharge density is the density before sludge discharge of the mechanical acceleration clarifier;
calculating the sludge discharge amount of the sludge concentration tank according to the sludge discharge flow rate of the mechanical acceleration clarification tank, the sludge discharge time of the mechanical acceleration clarification tank, the first sludge discharge density, the second sludge discharge density, the water density and the water content of sludge in the sludge concentration tank;
And controlling the sludge concentration tank to discharge sludge according to the sludge discharge amount of the sludge concentration tank.
Specifically, a measuring tool can be used for obtaining the sludge discharge flow rate of the mechanical acceleration clarification tank, the sludge discharge time of the mechanical acceleration clarification tank, the first sludge discharge density, the second sludge discharge density, the water density and the water content of sludge in the sludge concentration tank, and then the sludge discharge amount of the sludge concentration tank is calculated according to the sludge discharge flow rate of the mechanical acceleration clarification tank, the sludge discharge time of the mechanical acceleration clarification tank, the first sludge discharge density, the second sludge discharge density, the water density and the water content of sludge in the sludge concentration tank based on a preset sludge discharge amount calculation formula. And setting an automatic mud conveying program of the mud concentration tank, and controlling the mud concentration tank to discharge mud according to the mud discharge amount of the mud concentration tank. The mud conveying time is based on the mud discharge amount of the accumulated flow of the mud pipeline reaching the mud concentration tank.
In the scheme, the water density and the water content of the sludge in the sludge concentration tank are fixed values. The settings may be set in an automated program.
Optionally, the sludge thickener sludge discharge automatic module 108 is further configured to:
Calculating the sludge discharge amount of the sludge concentration tank according to the following formula;
Wherein q is the sludge discharge flow of the mechanical acceleration clarification tank, T is the sludge discharge time of the mechanical acceleration clarification tank, ρ1 is the first sludge discharge density, ρ2 is the second sludge discharge density, ρ is the water density, and w is the water content of the sludge in the sludge concentration tank.
In the embodiment, w is the water content of the sludge in the sludge concentration tank, and a designed fixed value (between 90 and 95 percent) is adopted in the program.
Specifically, the sludge discharge flow of the mechanical acceleration clarification tank, the sludge discharge time of the mechanical acceleration clarification tank, the first sludge discharge density, the second sludge discharge density, the water density and the water content of sludge in the sludge concentration tank can be combined and calculated to obtain the sludge discharge amount of the sludge concentration tank.
In this scheme, the filter automatic module 109 is used for controlling the input and the output of the filter in the raw water pretreatment system according to the inflow rate of the mechanical acceleration clarifier.
Optionally, the filter automation module 109 is specifically configured to:
Acquiring the water inflow of the mechanical acceleration clarifier and the water flow treated by a single filter;
calculating the input quantity of the filters according to the water inflow of the mechanical acceleration clarifier and the water flow treated by a single filter;
and controlling the input and the exit of the filter according to the input quantity of the filter.
Specifically, the flow of the water treated by each filter is generally fixed, the input quantity of the filters is automatically calculated according to the water inflow of the mechanical acceleration clarifier, the input quantity x=q1/q 2, wherein x is the input quantity of the filters, q1 is the water inflow of the mechanical acceleration clarifier, q2 is the water flow treated by a single filter, when the input quantity is not an integer, the numerical integers are added by 1, and when the equipment is input, the filters are input one by one according to the filter numbers. The filter can be automatically put in, automatically withdrawn and automatically backwashed when being automatically put in on selection. When the inflow of the mechanical acceleration clarification tank becomes larger, the input quantity is increased according to the calculated value, and when the inflow of the mechanical acceleration clarification tank becomes smaller, the input quantity is unchanged.
Further, when the filter differential pressure or the accumulated flow reaches the set cleaning condition, namely when (x-1) xq 2> q1, the filter is directly withdrawn, when (x-1) xq 2< q1, 1 filter is automatically put into according to the number, then the dead filter is automatically withdrawn, and the filter backwashing program is automatically started. Before the backwash program is started, the liquid level of the clean water tank is judged to be higher than a backwash set value and the liquid level of the recovery water tank is judged to be lower than a cleaning set value, otherwise, the backwash is in a waiting state until the liquid level reaches the requirement. When multiple filters fail at the same time, the backwash should be withdrawn one by one. The clean water tank is a filter effluent water storage tank and is used for supplementing production water and backwashing filter water.
In this scheme, the first inflow rate adjustment module 110 of the mechanical acceleration clarifier is configured to adjust and control the inflow rate of the mechanical acceleration clarifier by PID according to the liquid level of the clean water tank in the raw water pretreatment system. The water inflow of the mechanical acceleration clarification tank is gradually increased when the liquid level of the clean water tank is low, and the water inflow of the mechanical acceleration clarification tank is gradually decreased when the liquid level of the clean water tank is high.
In this embodiment, the second inflow adjustment module 111 of the mechanical acceleration clarifier is configured to adjust and control the inflow of the mechanical acceleration clarifier by PID according to the liquid level of the recovery water tank in the raw water pretreatment system. In order to reduce the influence on the water inflow of the mechanical acceleration clarifier when the water pump of the recovery pond is started, when the liquid level of the recovery pond reaches the liquid level of the starting water pump, the water inflow of the mechanical acceleration clarifier is automatically reduced, and the reduction is the water inflow of the recovery pond.
Optionally, the priority of the mechanical acceleration clarifier second inlet water flow conditioning module 111 is higher than the priority of the mechanical acceleration clarifier first inlet water flow conditioning module 110.
In this embodiment, the priority of the mechanical acceleration clarifier second water inlet flow rate adjustment module 111 is higher than the priority of the mechanical acceleration clarifier first water inlet flow rate adjustment module 110, i.e. the mechanical acceleration clarifier second water inlet flow rate adjustment module 111 is executed first, and then the mechanical acceleration clarifier first water inlet flow rate adjustment module 110 is executed.
According to the technical scheme, the system comprises an automatic input module, a water quantity automatic regulation module, a water temperature automatic regulation module, a mechanical acceleration clarification tank lime dosing automatic module, a mechanical acceleration clarification tank flocculating agent dosing automatic module, a mechanical acceleration clarification tank water outlet dosing automatic module, a mechanical acceleration clarification tank mud discharging automatic module, a mud concentration tank mud discharging automatic module, a filter automatic module, a mechanical acceleration clarification tank first water inlet flow regulation module and a mechanical acceleration clarification tank second water inlet flow regulation module. Through executing this technical scheme, through linking automatic procedure together, can realize the full automatic operation of former pretreatment of water system, promptly according to automatically regulated treatment water volume size, add dose automatically regulated, mechanical acceleration clarifier and sludge concentration pond arrange mud automatically operation, the filter is automatic to throw and move back and backwash.
It should be appreciated that various forms of the flows shown above may be used to reorder, add, or delete steps. For example, the steps described in the present invention may be performed in parallel, sequentially, or in a different order, so long as the desired results of the technical solution of the present invention are achieved, and the present invention is not limited herein.
The above embodiments do not limit the scope of the present invention. It will be apparent to those skilled in the art that various modifications, combinations, sub-combinations and alternatives are possible, depending on design requirements and other factors. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the scope of the present invention.
Claims (10)
1. An automatic control system of a raw water pretreatment system of a thermal power plant is characterized by comprising an automatic input module, an automatic water quantity adjusting module, an automatic water temperature adjusting module, an automatic lime dosing module of a mechanical accelerating clarification tank, an automatic flocculant dosing module of the mechanical accelerating clarification tank, an automatic water outlet and dosing module of the mechanical accelerating clarification tank, an automatic mud discharging module of a mud concentrating tank, an automatic filter module, a first water inlet flow adjusting module of the mechanical accelerating clarification tank and a second water inlet flow adjusting module of the mechanical accelerating clarification tank,
The automatic input module is used for controlling the operation of each device in the raw water pretreatment system;
The automatic water quantity adjusting module is used for controlling the opening of a water inlet valve of a mechanical acceleration clarification tank in the raw water pretreatment system;
The water temperature automatic adjusting module is used for controlling the opening of a water inlet valve of a mechanical acceleration clarification tank in the raw water pretreatment system;
the lime dosing automatic module of the mechanical acceleration clarification tank is used for controlling the lime dosing process of the mechanical acceleration clarification tank in the raw water pretreatment system;
The automatic flocculant dosing module of the mechanical acceleration clarification tank is used for controlling the flocculant dosing process of the mechanical acceleration clarification tank in the raw water pretreatment system;
The automatic module for adding the chemical into the water discharged from the mechanical acceleration clarification tank is used for controlling the chemical adding process of the water discharged from the mechanical acceleration clarification tank according to the acid-base number of the water discharged from the mechanical acceleration clarification tank in the raw water pretreatment system;
The mechanical acceleration clarification tank mud discharging automatic module is used for controlling the mud discharging process of the mechanical acceleration clarification tank in the raw water pretreatment system;
the sludge concentration tank sludge discharge automatic module is used for controlling the sludge discharge process of the sludge concentration tank in the raw water pretreatment system;
The filter automatic module is used for controlling the operation of a filter in the raw water pretreatment system;
The first water inflow flow regulating module of the mechanical acceleration clarification tank is used for regulating and controlling the water inflow flow of the mechanical acceleration clarification tank by utilizing PID according to the liquid level of the clean water tank in the raw water pretreatment system;
The second water inflow flow regulating module of the mechanical acceleration clarification tank is used for regulating and controlling the water inflow flow of the mechanical acceleration clarification tank by utilizing PID according to the liquid level of the recovery water tank in the raw water pretreatment system.
2. The system according to claim 1, characterized in that said automatic water quantity regulation module is specifically adapted to:
acquiring the inflow of a mechanical acceleration clarifier in a raw water pretreatment system;
determining a target valve opening corresponding to the water inflow according to the water inflow;
And controlling the opening of a water inlet valve of the mechanical acceleration clarification tank according to the opening of the target valve.
3. The system according to claim 1, characterized in that said automatic water temperature adjustment module is specifically configured to:
Acquiring the water temperature of incoming water in a raw water pretreatment system and the water temperature in a mechanical acceleration clarification tank;
And calculating a difference value between the water temperature of the incoming water and the water temperature in the mechanical acceleration clarification tank, and controlling the opening of a water inlet valve of the mechanical acceleration clarification tank according to the opening of a preset valve if the difference value meets a preset difference value condition.
4. The system according to claim 1, characterized in that said mechanical acceleration clarifier lime dosing automation module is specifically configured to:
acquiring a flow coefficient of the mechanical acceleration clarifier and a water inflow of the mechanical acceleration clarifier;
determining the frequency of a lime dosing pump according to the flow coefficient of the mechanical acceleration clarifier and the water inflow of the mechanical acceleration clarifier;
and according to the frequency of the lime dosing pump, utilizing PID to regulate and control the lime dosing process of the mechanical acceleration clarification tank.
5. The system of claim 1, wherein the mechanically accelerated clarifier flocculant dosing automation module is specifically configured to:
acquiring a flow coefficient of the mechanical acceleration clarifier and a water inflow of the mechanical acceleration clarifier;
calculating the frequency of a flocculant dosing pump according to the flow coefficient of the mechanical acceleration clarification tank and the water inflow of the mechanical acceleration clarification tank;
And (3) according to the frequency of the flocculant dosing pump, utilizing PID to regulate and control the flocculant dosing process of the mechanically accelerated clarification tank.
6. The system according to claim 1, wherein the mechanical acceleration clarifier sludge-discharge automation module is specifically configured to:
acquiring the water sample density of a second reaction zone in the mechanical acceleration clarification tank;
And if the density of the water sample is larger than the preset water sample density value, controlling the mechanical acceleration clarifier to discharge mud.
7. The system according to claim 1, characterized in that said sludge thickener sludge discharge automation module is specifically configured to:
obtaining the sludge discharge flow of the mechanical acceleration clarifier, the sludge discharge time of the mechanical acceleration clarifier, a first sludge discharge density, a second sludge discharge density, a water density and the water content of sludge in a sludge concentration tank, wherein the first sludge discharge density is the density before sludge discharge of the mechanical acceleration clarifier;
calculating the sludge discharge amount of the sludge concentration tank according to the sludge discharge flow rate of the mechanical acceleration clarification tank, the sludge discharge time of the mechanical acceleration clarification tank, the first sludge discharge density, the second sludge discharge density, the water density and the water content of sludge in the sludge concentration tank;
And controlling the sludge concentration tank to discharge sludge according to the sludge discharge amount of the sludge concentration tank.
8. The system of claim 7, wherein the sludge thickener sludge discharge automation module is further configured to:
Calculating the sludge discharge amount of the sludge concentration tank according to the following formula;
Wherein q is the sludge discharge flow of the mechanical acceleration clarification tank, T is the sludge discharge time of the mechanical acceleration clarification tank, ρ1 is the first sludge discharge density, ρ2 is the second sludge discharge density, ρ is the water density, and w is the water content of the sludge in the sludge concentration tank.
9. The system according to claim 1, characterized in that said filter automation module is specifically adapted to:
Acquiring the water inflow of the mechanical acceleration clarifier and the water flow treated by a single filter;
calculating the input quantity of the filters according to the water inflow of the mechanical acceleration clarifier and the water flow treated by a single filter;
and controlling the input and the exit of the filter according to the input quantity of the filter.
10. The system of claim 1, wherein the priority of the mechanical acceleration clarifier second inlet flow conditioning module is higher than the priority of the mechanical acceleration clarifier first inlet flow conditioning module.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202510200836.4A CN120136332A (en) | 2025-02-24 | 2025-02-24 | An automatic control system for raw water pretreatment system in thermal power plants |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202510200836.4A CN120136332A (en) | 2025-02-24 | 2025-02-24 | An automatic control system for raw water pretreatment system in thermal power plants |
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| Publication Number | Publication Date |
|---|---|
| CN120136332A true CN120136332A (en) | 2025-06-13 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202510200836.4A Pending CN120136332A (en) | 2025-02-24 | 2025-02-24 | An automatic control system for raw water pretreatment system in thermal power plants |
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| Country | Link |
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| CN (1) | CN120136332A (en) |
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2025
- 2025-02-24 CN CN202510200836.4A patent/CN120136332A/en active Pending
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