Evaluation method and device for coagulation clarification effect of power plant water treatment

Abstract

The invention provides a power plant water treatment system coagulation clarification effect evaluation method, and relates to the technical field of water treatment.The method comprises the steps that a first evaluation index of a coagulation clarification unit is determined, and the first evaluation index is effluent suspended matter concentration or effluent turbidity; a second evaluation index of the coagulation and clarification unit is determined, when the coagulation agent is ferric salt, the second evaluation index is the difference value of the iron content in the effluent and the iron content in the inlet water, and when the coagulation agent is aluminum salt, the second evaluation index is the difference value of the aluminum content in the effluent and the aluminum content in the inlet water; determining a comprehensive evaluation index based on the first and second evaluation indexes, and evaluating the coagulation clarification effect of the power plant water treatment system through the comprehensive evaluation index. By adopting the scheme, the method is simple to operate and easy to implement, can realize automation, can effectively judge the treatment effect of the coagulation clarification system, feeds back and regulates the adding amount of the coagulant in real time, and ensures stable effluent quality and safe and stable operation of subsequent water treatment equipment.

Description

Technical Field

[0001] The present application relates to the field of water treatment technology, and in particular to a method and device for evaluating the coagulation and clarification effect of water treatment in a power plant. Background Art

[0002] Coagulation and clarification involves adding a coagulant to water to aggregate suspended particles, colloids, and other impurities into larger flocs, which are then separated from the water through sedimentation or filtration. Coagulation and clarification are highly effective at removing colloids and suspended solids, with removal rates typically reaching 70% to 95%. They are widely used in power plant water treatment systems.

[0003] The effect of coagulation and clarification reaction is affected by factors such as the type and dosage of coagulants, water quality characteristics and hydraulic conditions. In the coagulation reaction process of water, insufficient addition of coagulants will not allow the impurities in the water to be fully destabilized and aggregated. Excessive addition of coagulants may lead to colloid re-stabilization. Both situations will result in poor effluent effect of the coagulation and clarification system. At the same time, excessive addition of coagulants may also enter the subsequent filtration system to produce post-flocculation reaction, resulting in excessive water quality and internal fouling in the subsequent system, affecting the safe and stable operation of the system. At present, the turbidity of the effluent from the coagulation and clarification system is generally monitored to characterize the treatment effect of the coagulation and clarification reaction. However, it cannot fully reflect the removal of pollutants in the water, nor can it reflect whether post-flocculation reaction may occur due to excessive effluent from the coagulant, which may bring safety hazards to the operation of the coagulation and clarification system and even the subsequent filtration system. Summary of the Invention

[0004] The present application aims to solve one of the technical problems in the related art at least to a certain extent.

[0005] To this end, the first purpose of this application is to propose a method for evaluating the coagulation and clarification effect of a power plant water treatment system, which is simple to operate, easy to implement, and can be automated. It can effectively judge the treatment effect of the coagulation and clarification system, and provide real-time feedback to adjust the coagulant dosage to ensure the stability of the effluent water quality and the safe and stable operation of subsequent water treatment equipment.

[0006] The second purpose of this application is to provide an evaluation device for the coagulation and clarification effect of a power plant water treatment system.

[0007] To achieve the above objectives, the first embodiment of the present application proposes a method for evaluating the coagulation and clarification effect of a power plant water treatment system, comprising:

[0008] Determining a first evaluation index of the coagulation and clarification unit, wherein the first evaluation index is effluent suspended solids concentration or effluent turbidity;

[0009] Determine the second evaluation index of the coagulation and clarification unit, wherein, when the coagulant is an iron salt, the second evaluation index is the difference between the iron content in the effluent and the iron content in the influent; when the coagulant is an aluminum salt, the second evaluation index is the difference between the aluminum content in the effluent and the aluminum content in the influent;

[0010] A comprehensive evaluation index is determined based on the first evaluation index and the second evaluation index, and the coagulation and clarification effect of the power plant water treatment system is evaluated by the comprehensive evaluation index.

[0011] To achieve the above-mentioned purpose, a second embodiment of the present invention provides an evaluation device for the coagulation and clarification effect of a power plant water treatment system, comprising:

[0012] A first evaluation module is used to determine a first evaluation index of the coagulation and clarification unit, wherein the first evaluation index is the effluent suspended solids concentration or the effluent turbidity;

[0013] A second evaluation module is used to determine a second evaluation index of the coagulation and clarification unit, wherein when the coagulant is an iron salt, the second evaluation index is the difference between the iron content in the effluent and the iron content in the influent; when the coagulant is an aluminum salt, the second evaluation index is the difference between the aluminum content in the effluent and the aluminum content in the influent;

[0014] The comprehensive evaluation module is used to determine a comprehensive evaluation index based on the first evaluation index and the second evaluation index, and evaluate the coagulation and clarification effect of the power plant water treatment system through the comprehensive evaluation index.

[0015] The evaluation method and device for the coagulation and clarification effect of the power plant water treatment system of the embodiment of the present application can be widely used in the coagulation and clarification unit of the power plant water treatment by evaluating the coagulation and clarification reaction effect after adding different coagulants (iron salts or aluminum salts); by measuring the effluent suspended solids concentration (turbidity) and the iron (aluminum) content in the inlet and outlet water of the coagulation and clarification system, the corresponding difference is calculated, and then the coagulation and clarification effect is comprehensively evaluated, and finally the coagulant dosage is corrected in real time by the deviation coefficient, the dosage of the agent is optimized, and the steady state of the coagulation and clarification system is better maintained. The measuring device of this embodiment has a simple structure and is easy to operate. By combining the measuring device with a precise evaluation and control method, the data accuracy is high, the control is precise and the delay is low, and the probability of the occurrence of the post-flocculation reaction can be effectively judged by the difference between the iron (aluminum) content in the effluent and the iron (aluminum) content in the inlet water, thereby avoiding affecting the effluent water quality of subsequent units and creating safety hazards for the operation of subsequent systems.

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

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

[0018] Figure 1 A flow chart of a method for evaluating the coagulation and clarification effect of a power plant water treatment system provided in Example 1 of the present application;

[0019] Figure 2 A technical roadmap for the embodiments of this application;

[0020] Figure 3 This is a structural schematic diagram of a device for evaluating the coagulation and clarification effect of a power plant water treatment system provided in an embodiment of the present application. DETAILED DESCRIPTION

[0021] The following describes in detail embodiments of the present application, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to be used to explain the present application, and should not be construed as limiting the present application.

[0022] The following describes a method and apparatus for evaluating the coagulation and clarification effect of a power plant water treatment system according to an embodiment of the present application with reference to the accompanying drawings.

[0023] Figure 1 This is a flow chart of a method for evaluating the coagulation and clarification effect of a power plant water treatment system provided in Example 1 of the present application.

[0024] like Figure 1 As shown, the evaluation method of the coagulation and clarification effect of the power plant water treatment system includes the following steps:

[0025] Step 101, determining a first evaluation index of a coagulation and clarification unit, wherein the first evaluation index is effluent suspended solids concentration or effluent turbidity;

[0026] In this embodiment, the suspended solids concentration (turbidity) of the effluent from the coagulation and clarification unit is measured by a measuring device.

[0027] Step 102: determining a second evaluation index of the coagulation and clarification unit, wherein when the coagulant is an iron salt, the second evaluation index is the difference between the iron content in the effluent and the iron content in the influent; when the coagulant is an aluminum salt, the second evaluation index is the difference between the aluminum content in the effluent and the aluminum content in the influent;

[0028] In this embodiment, the iron (aluminum) content in the influent and the iron (aluminum) content in the effluent of the coagulation and clarification unit are measured by a measuring device.

[0029] In this embodiment, the iron (aluminum) content in the influent of the coagulation and clarification unit refers to the iron (aluminum) content in the raw water, excluding the iron (aluminum) content in the coagulant addition.

[0030] Step 103 : determining a comprehensive evaluation index based on the first evaluation index and the second evaluation index, and evaluating the coagulation and clarification effect of the power plant water treatment system by using the comprehensive evaluation index.

[0031] In this embodiment, the comprehensive evaluation index is represented by the coagulation-clarification effect evaluation index R:

[0032]

[0033] Where: R represents the coagulation and clarification effect evaluation index, SS out The suspended solids concentration in the effluent of the coagulation and clarification unit is in mg / L, with a limit of 10 mg / L. out Indicates the turbidity of the effluent from the coagulation and clarification unit, in NTU, with a limit of 5NTU, Fe out 、Fe in Respectively represent the iron content of the coagulation and clarification unit outlet and inlet water, unit mg / L, Al out 、Al in Respectively represent the aluminum content in the inlet and outlet water of the coagulation and clarification unit, in mg / L.

[0034] In this embodiment, when the output result R=1, the iron (aluminum) content in the effluent is not higher than the iron (aluminum) content in the influent, indicating that the coagulant (iron salt or aluminum salt) added to the system has reacted completely without any residue, and the coagulant is not excessively added, which will not cause the restabilization of the colloid substances in the water, and has a good removal effect on the colloid substances in the water. At the same time, there is no residual coagulant entering the subsequent system to cause flocculation reaction, and the coagulation and clarification effect is evaluated to be good; when the output result R=0, it indicates that the coagulation and clarification effect is not good, that is, the effluent suspended matter exceeds 10 mg / L (or turbidity>5NTU) and the effluent iron (aluminum) content exceeds the influent iron (aluminum) content value. One of the two situations occurs or both occur at the same time.

[0035] In this embodiment, feedback is provided to adjust the operating conditions of the coagulation and clarification unit based on the evaluation results. When the output evaluation index R = 0, that is, the evaluation results show that the coagulation and clarification effect of the system is poor, the effluent deviation coefficient λ of the coagulation and clarification unit is calculated, and timely guidance and feedback are provided to adjust the system operating parameters. Specifically, the process includes:

[0036] The iron (aluminum) content difference deviation function can be calculated according to the following formula:

[0037]

[0038] Wherein, C is the sum of the iron (aluminum) content in the influent and the coagulant dosage;

[0039] The deviation of the effluent from the coagulation and clarification unit is characterized by the deviation coefficient λ:

[0040]

[0041] Wherein, λ is the effluent deviation coefficient of the coagulation and clarification unit, ω1 is the effluent suspended solids deviation weight, ω2 is the iron (aluminum) content difference deviation weight, the weight factors ω1 and ω2 need to be selected and determined according to the effluent conditions, the effluent suspended solids deviation weight ω1 is generally 0.3-0.6, the iron (aluminum) content difference deviation weight ω2 is generally 0.5-0.7, ω1+ω2=0, f(D) is the iron (aluminum) content difference deviation function, D is the iron (aluminum) content difference, which is the difference between the iron (aluminum) content in the effluent and the iron (aluminum) content in the inlet;

[0042] Adjust the coagulant dosage of the coagulation and clarification system according to the following formula:

[0043] C F =C0λ

[0044] Where C F is the dosage of coagulant, mg / L, C0 is the dosage of coagulant before adjustment, mg / L.

[0045] In this embodiment, the coagulation and clarification reaction effect is evaluated regularly to guide the safe and stable operation of the coagulation and clarification unit. The evaluation cycle is generally 5 to 7 days.

[0046] The evaluation method of the coagulation and clarification effect of the power plant water treatment system in the embodiment of the present application adopts the following method: Figure 2 The technical route shown can be widely used in the coagulation and clarification unit of water treatment in power plants by evaluating the coagulation and clarification reaction effect after adding different coagulants (iron salts or aluminum salts); by measuring the effluent suspended solids concentration (turbidity) and the iron (aluminum) content in the inlet and outlet water of the coagulation and clarification system, the corresponding difference is calculated, and then the coagulation and clarification effect is comprehensively evaluated. Finally, the coagulant dosage is corrected in real time by the deviation coefficient, the dosage of the agent is optimized, and the steady state of the coagulation and clarification system is better maintained. The measuring device of this embodiment has a simple structure and is easy to operate. By combining the measuring device with a precise evaluation and control method, the data accuracy is high, the control is precise and the delay is low. The difference between the iron (aluminum) content in the effluent and the iron (aluminum) content in the inlet can effectively judge the probability of the occurrence of the post-flocculation reaction, avoid affecting the effluent water quality of the subsequent units, and avoid creating safety hazards for the operation of the subsequent system.

[0047] This embodiment also provides a method for evaluating the coagulation and clarification effectiveness of a power plant water treatment system. This method was applied to a pilot desalination system at a coastal power plant. The pretreatment unit was designed to operate at a capacity of 10 t / h and employed a "flotation + V-type filter + sand filtration" process. Coagulant and coagulant aid dosing points were located on the flotation tank inlet main pipe. Ferric chloride was used as the coagulant at a dosage of 10 mg / L, and polyacrylamide was used as the coagulant at a dosage of 1.5 mg / L. The primary water quality indicators for the raw seawater are shown in Table 1 below:

[0048] Table 1 Main water quality of raw seawater

[0049]

[0050] During the pilot test, the water produced by each unit was monitored, and the results are as follows:

[0051] The average inlet water turbidity of the flotation tank is 6.73NTU, the average produced water turbidity is 2.22NTU, and the average turbidity removal rate is about 67%; the flotation produced water enters the V-type filter. After stable operation, the filter produced water turbidity ranges from 0.1 to 1.3NTU, with an average turbidity of 0.3NTU, and the turbidity removal rate reaches 83%, with a significant turbidity reduction effect; the flotation produced water enters the sand filter device. The turbidity range of the sand filter produced water is 0.02 to 0.93NTU, with an average turbidity of 0.17NTU, and the turbidity removal rate is about 43%. However, the SDI value of the sand filter produced water is relatively high (greater than 5), which does not meet the water inlet requirements of the subsequent reverse osmosis device.

[0052] This example evaluates the coagulation and clarification effect of the flotation unit, as follows:

[0053] The turbidity of the flotation unit's effluent and the iron content of the inlet and outlet water were selected as evaluation indicators;

[0054] According to monitoring data, the average turbidity of the water produced by the flotation unit is 2.22NTU, which does not exceed the evaluation standard of 5NTU, and the turbidity reduction effect is good;

[0055] The main source of iron in raw seawater is Fe 3+ , its content was measured to be 0.00174 mg / L; ferric chloride was used as coagulant, and the iron content was 10 mg / L×56÷162.5=3.446 mg / L;

[0056] The effluent from the flotation unit was sampled and analyzed for iron content, which was found to be 2.24 mg / L;

[0057] The calculated iron content difference = effluent iron content - raw water iron content = 2.24 mg / L - 0.00174 mg / L = 2.23826 mg / L. According to the formula, the output evaluation result R = 0, indicating that the effluent contains incompletely reacted coagulant. Excessive coagulant addition may cause the colloids in the water to stabilize, hindering their removal. It may also cause post-flocculation reactions in the subsequent sand filter, ultimately causing the sand filter water to exceed the SDI standard (>5), failing to meet the feed requirements of the subsequent reverse osmosis unit.

[0058] According to formula (3), the iron content difference deviation coefficient f(D) = 2.23826 / (0.00174+3.446)≈0.6492.

[0059] Calculate the effluent deviation coefficient λ of the coagulation and clarification unit, where ω1 is taken as 0.3 and ω2 is taken as 0.7. According to the formula, λ = 0.3×(2.22-5) / 5+0.7×0.6492≈-0.1668+0.45=0.2832.

[0060] Based on the evaluation conclusions and measurement results, the adjusted dosage was calculated as 10 × 0.2832 = 2.832 mg / L. The coagulant dosage was set at 3.0 mg / L, and no coagulant aid was added. After the adjustment, when the system was running stably, the average inlet water turbidity of the flotation tank was 2.32 NTU, the average output water turbidity was 1.62 NTU, and the average turbidity removal rate was about 30%. The average output water turbidity of the sand filter was 0.17 NTU, and the turbidity removal rate was about 43%. The coagulation and clarification effect of the flotation tank was re-evaluated according to the above method:

[0061] The effluent from the adjusted flotation unit was sampled and analyzed for iron content, which was found to be 0.00022 mg / L;

[0062] Calculate the iron content difference = iron content in effluent - iron content in raw water = 0.00022 mg / L - 0.00174 mg / L < 0, and output the evaluation result R = 1, indicating that the coagulation and clarification effect of the flotation tank is good at this time, the coagulant addition reacts completely, and some iron ions in the raw water are removed.

[0063] The SDI value of the sand filtration water was analyzed, and the results showed that SDI = 1.8, which meets the water inlet requirements of the subsequent reverse osmosis unit.

[0064] In order to implement the above embodiment, the present application also proposes an evaluation device for the coagulation and clarification effect of a power plant water treatment system.

[0065] Figure 3 This is a structural schematic diagram of a device for evaluating the coagulation and clarification effect of a power plant water treatment system provided in an embodiment of the present application.

[0066] like Figure 3 As shown, the evaluation device for the coagulation and clarification effect of the power plant water treatment system includes:

[0067] A first evaluation module is used to determine a first evaluation index of the coagulation and clarification unit, wherein the first evaluation index is the effluent suspended solids concentration or the effluent turbidity;

[0068] A second evaluation module is used to determine a second evaluation index of the coagulation and clarification unit, wherein when the coagulant is an iron salt, the second evaluation index is the difference between the iron content in the effluent and the iron content in the influent; when the coagulant is an aluminum salt, the second evaluation index is the difference between the aluminum content in the effluent and the aluminum content in the influent;

[0069] The comprehensive evaluation module is used to determine a comprehensive evaluation index based on the first evaluation index and the second evaluation index, and evaluate the coagulation and clarification effect of the power plant water treatment system through the comprehensive evaluation index.

[0070] Furthermore, in the embodiment of the present application, the comprehensive evaluation index is the coagulation and clarification effect evaluation index R, which is expressed as:

[0071]

[0072] Among them, SS out Indicates the suspended solids concentration in the effluent of the coagulation and clarification unit, TU out Indicates the turbidity of the effluent from the coagulation and clarification unit, Fe out Indicates the iron content in the effluent from the coagulation and clarification unit, Fe in Indicates the iron content in the influent of the coagulation and clarification unit, Al out Indicates the aluminum content in the effluent from the coagulation and clarification unit, Al in Indicates the aluminum content in the influent of the coagulation and clarification unit.

[0073] Specifically, in the embodiment of the present application, the coagulation and clarification effect of the power plant water treatment system is evaluated by a comprehensive evaluation index R, including:

[0074] When R is equal to 1, the coagulation and clarification effect is good and no post-flocculation reaction occurs;

[0075] When R is equal to 0, it is judged that the coagulation and clarification effect is poor.

[0076] Furthermore, in the embodiment of the present application, the device further includes a feedback module, which adjusts the dosage of the coagulant according to the first evaluation index, the second evaluation index and the comprehensive evaluation index after determining that the coagulation and clarification effect is not good. The feedback module is specifically used to:

[0077] The deviation function of the second evaluation index is constructed as:

[0078]

[0079] Wherein, when the coagulant is an iron salt, C is the sum of the iron content in the influent and the coagulant dosage, and D is the difference between the iron content in the effluent and the iron content in the influent; when the coagulant is an aluminum salt, C is the sum of the aluminum content in the influent and the coagulant dosage, and D is the difference between the aluminum content in the effluent and the aluminum content in the influent;

[0080] The effluent deviation coefficient λ of the coagulation and clarification unit is calculated based on the deviation function of the first evaluation index, the second evaluation index and the comprehensive evaluation index, and is expressed as:

[0081]

[0082] Among them, R is the comprehensive evaluation index, TU out is the effluent turbidity of the coagulation and clarification unit, ω1 and ω2 are weight coefficients;

[0083] The dosage of coagulant is adjusted based on the deviation coefficient, which is expressed as:

[0084] C F =C0λ

[0085] Among them, C0 is the dosage of coagulant before adjustment, C F is the adjusted coagulant dosage.

[0086] Specifically, in the embodiment of the present application, the device further includes a period adjustment module and a regulation module, which are used to:

[0087] In each evaluation cycle, the coagulation and clarification reaction effect is evaluated by the first evaluation module, the second evaluation module and the comprehensive evaluation module. When the coagulation and clarification effect is judged to be poor, the safe and stable operation of the coagulation and clarification unit is guided according to the adjusted coagulant dosage generated by the feedback module.

[0088] It should be noted that the above explanation of the embodiment of the evaluation method for the coagulation and clarification effect of the power plant water treatment system is also applicable to the evaluation device for the coagulation and clarification effect of the power plant water treatment system of this embodiment, and will not be repeated here.

[0089] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example" or "some examples" means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present application. In this specification, the schematic expressions of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art can combine and combine different embodiments or examples described in this specification and features of different embodiments or examples without contradiction.

[0090] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of the technical features being referred to. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of such features. Throughout the description of this application, "plurality" means at least two, for example, two, three, etc., unless otherwise specifically defined.

[0091] Any process or method description in a flowchart or otherwise described herein may be understood to represent a module, segment or portion of code comprising one or more executable instructions for implementing the steps of a custom logical function or process, and the scope of the preferred embodiments of the present application includes alternative implementations in which functions may be performed out of the order shown or discussed, including performing functions in a substantially simultaneous manner or in the reverse order depending on the functions involved, which should be understood by those skilled in the art to which the embodiments of the present application belong.

[0092] The logic and / or steps represented in the flowcharts or otherwise described herein, for example, can be considered as a sequenced list of executable instructions for implementing the logical functions, and can be embodied in any computer-readable medium for use by, or in conjunction with, an instruction execution system, apparatus, or device (e.g., a computer-based system, a system including a processor, or other system that can fetch and execute instructions from an instruction execution system, apparatus, or device). For purposes of this specification, a "computer-readable medium" can be any device that can contain, store, communicate, propagate, or transport a program for use by, or in conjunction with, an instruction execution system, apparatus, or device. More specific examples (a non-exhaustive list) of computer-readable media include the following: an electrical connection with one or more wires (electronic devices), a portable computer disk cartridge (magnetic device), random access memory (RAM), read-only memory (ROM), erasable and programmable read-only memory (EPROM or flash memory), fiber optic devices, and a portable compact disc read-only memory (CDROM). Furthermore, the computer-readable medium may even be paper or other suitable medium on which the program is printed, since the program may be obtained electronically, for example, by optically scanning the paper or other medium and then editing, interpreting or processing it in another suitable manner if necessary, and then storing it in a computer memory.

[0093] It should be understood that various parts of the present application can be implemented using hardware, software, firmware, or a combination thereof. In the above embodiments, multiple steps or methods can be implemented using software or firmware stored in a memory and executed by a suitable instruction execution system. For example, if implemented using hardware, as in another embodiment, any one of the following technologies known in the art or a combination thereof can be used to implement: a discrete logic circuit having a logic gate circuit for implementing a logic function on a data signal, an application-specific integrated circuit having a suitable combination of logic gate circuits, a programmable gate array (PGA), a field programmable gate array (FPGA), etc.

[0094] Those skilled in the art will understand that all or part of the steps in the method of the above embodiment can be completed by instructing related hardware through a program, and the program can be stored in a computer-readable storage medium. When the program is executed, it includes one or a combination of the steps of the method embodiment.

[0095] In addition, the functional units in the various embodiments of the present application may be integrated into a processing module, or each unit may exist physically separately, or two or more units may be integrated into a module. The above-mentioned integrated module may be implemented in the form of hardware or in the form of a software functional module. If the integrated module is implemented in the form of a software functional module and sold or used as an independent product, it may also be stored in a computer-readable storage medium.

[0096] The storage medium mentioned above may be a read-only memory, a magnetic disk, or an optical disk, etc. Although the embodiments of the present application have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present application. Persons skilled in the art may make changes, modifications, substitutions, and variations to the above embodiments within the scope of the present application.

Claims

1. A method for evaluating the coagulation and clarification effect of a power plant water treatment system, characterized in that: include: Determining a first evaluation index of a coagulation and clarification unit, wherein the first evaluation index is an effluent suspended solids concentration or an effluent turbidity; Determine a second evaluation index for the coagulation and clarification unit, wherein when the coagulant is an iron salt, the second evaluation index is the difference between the iron content in the effluent and the iron content in the influent; when the coagulant is an aluminum salt, the second evaluation index is the difference between the aluminum content in the effluent and the aluminum content in the influent; A comprehensive evaluation index is determined based on the first evaluation index and the second evaluation index, and the coagulation and clarification effect of the power plant water treatment system is evaluated by the comprehensive evaluation index.

2. The method according to claim 1, wherein The comprehensive evaluation index is the coagulation and clarification effect evaluation index R, which is expressed as: Among them, SS out Indicates the suspended solids concentration in the effluent of the coagulation and clarification unit, TU out Indicates the turbidity of the effluent from the coagulation and clarification unit, Fe out Indicates the iron content in the effluent from the coagulation and clarification unit, Fe in Indicates the iron content in the influent of the coagulation and clarification unit, Al out Indicates the aluminum content in the effluent from the coagulation and clarification unit, Al in Indicates the aluminum content in the influent of the coagulation and clarification unit.

3. The method according to claim 2, wherein The coagulation and clarification effect of the power plant water treatment system is evaluated through the comprehensive evaluation index R, including: When R is equal to 1, the coagulation and clarification effect is good and no post-flocculation reaction occurs; When R is equal to 0, it is judged that the coagulation and clarification effect is poor.

4. The method according to claim 3, wherein After determining that the coagulation and clarification effect is poor, the method further includes: The deviation function of the second evaluation index is constructed as: Wherein, when the coagulant is an iron salt, C is the sum of the iron content in the influent and the coagulant dosage, and D is the difference between the iron content in the effluent and the iron content in the influent; when the coagulant is an aluminum salt, C is the sum of the aluminum content in the influent and the coagulant dosage, and D is the difference between the aluminum content in the effluent and the aluminum content in the influent; The effluent deviation coefficient λ of the coagulation and clarification unit is calculated based on the deviation function of the first evaluation index, the second evaluation index and the comprehensive evaluation index, and is expressed as: Among them, R is the comprehensive evaluation index, TU out is the effluent turbidity of the coagulation and clarification unit, ω1 and ω2 are weight coefficients; The dosage of coagulant is adjusted based on the deviation coefficient, which is expressed as: C F =C0λ Among them, C0 is the dosage of coagulant before adjustment, C F is the adjusted coagulant dosage.

5. The method according to claim 4, wherein The method further comprises: The coagulation and clarification reaction effect is evaluated in each evaluation cycle, and when it is judged that the coagulation and clarification effect is not good, the safe and stable operation of the coagulation and clarification unit is guided according to the adjusted coagulant dosage.

6. An evaluation device for the coagulation and clarification effect of a power plant water treatment system, characterized in that: include: A first evaluation module, configured to determine a first evaluation index of a coagulation and clarification unit, wherein the first evaluation index is an effluent suspended solids concentration or an effluent turbidity; A second evaluation module is used to determine a second evaluation index of the coagulation and clarification unit, wherein when the coagulant is an iron salt, the second evaluation index is the difference between the iron content in the effluent and the iron content in the influent; when the coagulant is an aluminum salt, the second evaluation index is the difference between the aluminum content in the effluent and the aluminum content in the influent; A comprehensive evaluation module is used to determine a comprehensive evaluation index based on the first evaluation index and the second evaluation index, and evaluate the coagulation and clarification effect of the power plant water treatment system through the comprehensive evaluation index.

7. The device according to claim 6, characterized in that The comprehensive evaluation index is the coagulation and clarification effect evaluation index R, which is expressed as: Among them, SS out Indicates the suspended solids concentration in the effluent of the coagulation and clarification unit, TU out Indicates the turbidity of the effluent from the coagulation and clarification unit, Fe out Indicates the iron content in the effluent from the coagulation and clarification unit, Fe in Indicates the iron content in the influent of the coagulation and clarification unit, Al out Indicates the aluminum content in the effluent from the coagulation and clarification unit, Al in Indicates the aluminum content in the influent of the coagulation and clarification unit.

8. The device according to claim 7, wherein The coagulation and clarification effect of the power plant water treatment system is evaluated through the comprehensive evaluation index R, including: When R is equal to 1, the coagulation and clarification effect is good and no post-flocculation reaction occurs; When R is equal to 0, it is judged that the coagulation and clarification effect is poor.

9. The device according to claim 8, wherein The device further includes a feedback module for adjusting the dosage of the coagulant according to the first evaluation index, the second evaluation index and the comprehensive evaluation index after determining that the coagulation and clarification effect is not good. The feedback module is specifically used to: The deviation function of the second evaluation index is constructed as: Wherein, when the coagulant is an iron salt, C is the sum of the iron content in the influent and the coagulant dosage, and D is the difference between the iron content in the effluent and the iron content in the influent; when the coagulant is an aluminum salt, C is the sum of the aluminum content in the influent and the coagulant dosage, and D is the difference between the aluminum content in the effluent and the aluminum content in the influent; The effluent deviation coefficient λ of the coagulation and clarification unit is calculated based on the deviation function of the first evaluation index, the second evaluation index and the comprehensive evaluation index, and is expressed as: Among them, R is the comprehensive evaluation index, TU out is the effluent turbidity of the coagulation and clarification unit, ω1 and ω2 are weight coefficients; The dosage of coagulant is adjusted based on the deviation coefficient, which is expressed as: C F =C0λ Among them, C0 is the dosage of coagulant before adjustment, C F is the adjusted coagulant dosage.

10. The device according to claim 9, wherein The device further comprises a regulating module, configured to: In each evaluation cycle, the coagulation and clarification reaction effect is evaluated by the first evaluation module, the second evaluation module and the comprehensive evaluation module. When it is judged that the coagulation and clarification effect is not good, the safe and stable operation of the coagulation and clarification unit is guided according to the adjusted coagulant dosage generated by the feedback module.

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