CN-122006323-A - Partitioned stepping back flushing system and method for rotary filter screen

CN122006323ACN 122006323 ACN122006323 ACN 122006323ACN-122006323-A

Abstract

The invention discloses a partitioned stepping back flushing system and method for a rotary filter screen, comprising a state monitoring module, a blocking characteristic quantization module, a state judging module, a flushing mode selecting module and a multi-drive flushing module, wherein the state monitoring module is used for collecting vibration spectrum data, visual image data and pressure difference data of the rotary filter screen body of each partition uniformly divided along the circumference of the rotary filter screen body in real time, and the blocking characteristic quantization module can extract vibration unordered values in the vibration spectrum data And contrast in visual image data Correlation value Combining with the pressure difference value Y, the state judging module can classify the multi-dimensional characteristic array by the classifying model Mapped to a high-dimensional space. The invention can realize the accurate positioning and targeted flushing of each partition of the rotary filter screen body, and effectively solves the problems of untimely cleaning of the severe blocking area caused by excessive flushing of the cleaning area.

Inventors

ZHANG CHENGRUI
ZHANG FENGRU
YU LINGBO
HOU BOWEN
Mou Yunqi
SUN XUEFENG
LU GANG
WANG CHENGLIN
WANG ZHICHAO
Tang Ruoying
HOU FULIN
WANG YUHAN
ZHAO HAN

Assignees

华能国际电力股份有限公司大连电厂

Dates

Publication Date: 20260512
Application Date: 20260202

Claims (9)

1. The partitioned stepping back flushing system for the rotary filter screen is characterized by comprising a state monitoring module (2), a blocking characteristic quantifying module, a state judging module, a flushing mode selecting module and a multi-drive flushing module; The state monitoring module (2) is used for collecting vibration spectrum data, visual image data and pressure difference data of the rotary filter screen body (1) of each subarea evenly divided along the circumference of the rotary filter screen body (1) in real time; the blockage characteristic quantization module can extract vibration unordered values in vibration spectrum data And contrast in visual image data Correlation value Combining the pressure difference value Y to fuse multiple parameters into a multidimensional feature array And output; the state judging module can be used for arranging the multidimensional feature array through a classification model Mapping to a high-dimensional space, calculating a regional blockage level reference value S, and outputting a blockage level corresponding to the regional blockage level reference value S; The flushing mode selection module can carry out matching inquiry with the built-in data table according to the comprehensive blocking level and type, generate a corresponding control instruction set containing complete flushing parameters and send the control instruction set to the multi-drive flushing module; The multi-drive flushing module can receive the control instruction set to generate corresponding control instructions and respectively send the control instructions to the corresponding drive total units.
2. The zoned step backwash system for rotary screen of claim 1 wherein the plugging feature quantification module comprises a first treatment unit and a second treatment unit; The first processing unit can decompose vibration spectrum data into a plurality of rotation components based on an intrinsic time scale decomposition algorithm, and calculate vibration unordered values of the first three rotation components And combined to form vibration characteristic vector , , A degree of confusion reflecting the vibration disorder value; The second processing unit can process the visual image data based on a gray level co-occurrence matrix method, construct a gray level co-occurrence matrix and calculate the contrast based on the gray level co-occurrence matrix Correlation value 。
3. A zoned step backwash system for rotary screen according to claim 2 wherein the second treatment unit is as follows: 1) Converting the visual image data into a gray scale image form; 2) Constructing a gray level co-occurrence matrix from the converted gray level image; 3) Computing contrast based on gray level co-occurrence matrix ; Contrast ratio The calculation formula of (2) is as follows: Wherein, the Is the position in the gray level co-occurrence matrix ) Is used for the display of the display panel, Is a gray level number; 4) Calculating correlation value based on gray level co-occurrence matrix ; Correlation value The calculation formula of (2) is as follows: Wherein, the And Respectively the element values And Is used for the average value of (a), And Respectively, the element values.
4. The zoned step backwash system for a rotary screen of claim 1 wherein the status determination module is specifically as follows: 1) Taking the multi-dimensional feature array X as an input sample through a classification model, and mapping the multi-dimensional feature array X into a high-dimensional feature space through a mapping function, wherein the mapping function is used for mapping the multi-dimensional feature array X The following are provided: Wherein, the And The method comprises the steps of obtaining a preset weight vector and a preset bias vector; 2) According to the mapping function Multi-dimensional feature array for sign determination of (a) Is defined as the initial category of (a); 3) After obtaining the initial class result, calculating the multidimensional feature array To the optimal super plane And calculating the reference value of the area blockage level according to the geometric distance d of the area blockage level Area blockage level reference value The calculation formula of (2) is as follows: Wherein, the Is a parameter factor; 4) And judging the comprehensive jam grade according to the threshold value.
5. The zoned step backwash system for a rotary screen of claim 4 wherein if said mapping function Not less than 0, multidimensional feature array Classified as blocked, if mapped function <0, Then multidimensional feature array Classified as unblocked.
6. The partitioned stepping backwash system for the rotary filter screen according to claim 1, wherein the flushing mode selection module comprises a reading unit and a matching unit, wherein the reading unit can read preset partitioned configuration parameters of the rotary filter screen body (1) and is internally provided with a data table containing mapping relations between station numbers and corresponding physical positions; the matching unit can acquire the partition blocking level S and the blocking object type through the real-time data bus, and then performs matching inquiry with the data table to generate a control instruction set containing complete flushing parameters.
7. The zoned step backwash system for rotary screen of claim 1 wherein the control instructions include valve opening and closing timing, pump start and stop frequency and regulator valve opening.
8. The zoned step-by-step backwash system for a rotary screen according to claim 1, wherein the total driving unit comprises an air pulse driving unit, a water jet driving unit and an air-water mixed flushing driving unit, the air pulse driving unit can generate air pulses with pulse width and pressure capable of being accurately controlled, the water jet driving unit is responsible for regulating and controlling flow and pressure of flushing water, and the air-water mixed flushing driving unit is used for generating intermittent oscillation jet flow of gas-liquid two phases.
9. A zoned step-by-step backwash method for a rotary screen comprising the steps of: s1, respectively acquiring vibration spectrum data, visual image data and pressure difference data of a rotary filter screen body (1) of each partition evenly divided along the circumference of the rotary filter screen body (1); S2, carrying out intrinsic time scale decomposition on the acquired vibration spectrum data, and calculating vibration disorder values of the first three rotation components to construct vibration feature vectors; S3, normalizing the vibration characteristic vector, the contrast ratio, the correlation value and the pressure difference value and fusing into a multidimensional characteristic array; S4, mapping the multi-dimensional feature array to a high-dimensional space, calculating a geometric distance and a regional blockage level reference value, and determining a blockage level and a corresponding blockage type through a threshold value; s5, based on preset partition configuration parameters of the rotary filter screen body (1) and blocking grades of all partitions, matching and inquiring in a built-in data table to generate a control instruction set containing complete flushing parameters; And S6, after the multi-drive flushing module receives the control instruction, the time sequence controller sequentially activates the corresponding drive total units according to a preset program.

Description

Partitioned stepping back flushing system and method for rotary filter screen Technical Field The invention relates to the technical field of water treatment, in particular to a partitioned stepping back flushing system and method for a rotary filter screen. Background The utility model relates to a power plant circulating water rotary filter screen body, which is a device for filtering impurities in a power plant circulating water system. It is usually installed at the water inlet or return water port of circulating water, and realizes continuous rotation by motor drive. When water passes through, suspended matters, algae, sediment and other impurities in the water can be intercepted by the rotary filter screen body, and the filtered water can be recycled in the system. The rotary filter screen body generally comprises a frame, a rotary filter screen body, a transmission device, a back flushing system and the like. After the rotary filter screen is operated for a long time, the surface of the rotary filter screen body is blocked by impurities, so that the filtering efficiency is reduced, and the rotary filter screen body needs to be backwashed by a backwashing system periodically. However, most of the current back flushing systems of the rotary filter screen body mostly adopt a mode of flushing through continuous rotation and fixed nozzles to perform back flushing, and flushing is performed according to a preset time interval no matter whether the rotary filter screen body is actually blocked or not, so that the cleaning area is easy to excessively flush, the blocking serious area cannot be cleaned timely and sufficiently, and the blocking difference of the local area of the rotary filter screen body cannot be identified. Disclosure of Invention Therefore, the invention provides a partitioned stepping back flushing system and a partitioned stepping back flushing method for a rotary filter screen, which are used for solving the problems in the prior art. In order to achieve the above object, the present invention provides the following technical solutions: in a first aspect, a zoned step backwash system for a rotary screen includes a status monitoring module, a blockage feature quantification module, a status determination module, a flush mode selection module, and a multi-drive flush module; the state monitoring module is used for collecting vibration spectrum data, visual image data and pressure difference data of the rotary filter screen body of each partition evenly divided along the circumference of the rotary filter screen body in real time; the blockage characteristic quantization module can extract vibration unordered values in vibration spectrum data And contrast in visual image dataCorrelation valueCombining the pressure difference value Y to fuse multiple parameters into a multidimensional feature arrayAnd output; the state judging module can be used for arranging the multidimensional feature array through a classification model Mapping to a high-dimensional space, calculating a regional blockage level reference value S, and outputting a blockage level corresponding to the regional blockage level reference value S; The flushing mode selection module can carry out matching inquiry with the built-in data table according to the comprehensive blocking level and type, generate a corresponding control instruction set containing complete flushing parameters and send the control instruction set to the multi-drive flushing module; The multi-drive flushing module can receive the control instruction set to generate corresponding control instructions and respectively send the control instructions to the corresponding drive total units. Further, the blocking feature quantifying module comprises a first processing unit and a second processing unit; The first processing unit can decompose vibration spectrum data into a plurality of rotation components based on an intrinsic time scale decomposition algorithm, and calculate vibration unordered values of the first three rotation components And combined to form vibration characteristic vector,,A degree of confusion reflecting the vibration disorder value; The second processing unit can process the visual image data based on a gray level co-occurrence matrix method, construct a gray level co-occurrence matrix and calculate the contrast based on the gray level co-occurrence matrix Correlation value。 Further, the specific contents of the second processing unit are as follows: 1) Converting the visual image data into a gray scale image form; 2) Constructing a gray level co-occurrence matrix from the converted gray level image; 3) Computing contrast based on gray level co-occurrence matrix ; Contrast ratioThe calculation formula of (2) is as follows: Wherein, the Pixel values for locations in the gray level co-occurrence matrix,Is a gray level number; 4) Calculating correlation value based on gray level co-occurrence matrix ; Correlation valueThe calculation formula of