CN115671818A - Intelligent control method and system for plate-and-frame filter press - Google Patents
Intelligent control method and system for plate-and-frame filter press Download PDFInfo
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- CN115671818A CN115671818A CN202211397333.3A CN202211397333A CN115671818A CN 115671818 A CN115671818 A CN 115671818A CN 202211397333 A CN202211397333 A CN 202211397333A CN 115671818 A CN115671818 A CN 115671818A
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Abstract
The invention discloses an intelligent control method and system for a plate and frame filter press, wherein the method comprises the following steps: collecting material concentration and liquid level; controlling the filter press to start and stop; collecting the feeding flow and the feeding pressure; when the feeding flow exceeds the normal flow and the feeding pressure cannot rise after a period of time delay, judging that the pipeline or the filter plate leaks, automatically stopping feeding and alarming; calculating the longest filter pressing time required by the filter press, and predicting the water content; collecting the turbidity and flow of the filtrate; judging the filtrate to be leaked when the turbidity of the filtrate exceeds the rated turbidity; the difference value between the filtrate flow and the feeding flow exceeds a rated value and is judged to be leakage; collecting a surface image of the filter cloth during each cleaning, automatically judging whether to carry out secondary cleaning, switching to filter pressing, stopping and prompting to replace the filter cloth through image analysis; the positions of the filter plates are positioned by induction, and the filter plates are automatically corrected by pulling; and establishing an intelligent analysis and decision model of the plate-and-frame filter press. The invention can realize the autonomous control of the plate-and-frame filter press and complete intelligent operation.
Description
Technical Field
The invention belongs to the field of automatic control, and particularly relates to an intelligent control method and system for a plate and frame filter press.
Background
The plate-frame type filter-pressing dewatering equipment is also called a plate-frame filter press, and is widely applied to the industries of food, medicine, mining, metallurgy and the like due to the advantages of large filtering driving force, high solid content of filter cakes, clear filtrate, high solid recovery rate, low sludge conditioning medicine consumption and the like. The automatic operation function of present plate and frame filter press body has been realized, and the automatic motion is most gathers digital signal, output control step, for example according to the limit switch of installation on the body: (1) Triggering the plate pulling action according to the main push plate retreating travel limit switch; (2) Triggering the liquid receiving plate to close according to the pull plate retreating travel limit switch; (3) Triggering filter pressing/flushing action according to a limit switch on the liquid receiving plate; (4) Triggering the main push plate to release pressure and retreat according to the lower limit switch of the liquid receiving plate; (5) And triggering the downward probing/lifting action of the flushing rod according to the upper/lower limit switches of the flushing rod, and the like. In addition, few operation steps are output by comparing analog signals such as pressure and time, for example: (1) Collecting the pressure of the feeding pipe to be compared with an internal value, and triggering to stop feeding; (2) The time length of each step of the plate pulling process is counted, the plate pulling forward/backward movement is triggered, and the like, the automatic movement only belongs to the basic automation range, and the difference from intellectualization and intellectualization is large.
The plate-and-frame filter press as a main dewatering device has many problems in actual operation: 1. the automation level is low, the sludge is not completely discharged, the operation labor intensity is high, and the labor efficiency is not favorably improved; 2. the conditions of liquid leakage, slurry spraying and the like are frequently generated, the environmental pollution of equipment and workshops is easily caused, the field is difficult to be greatly improved, and the greater environmental protection risk exists; 3. the failure rate of the cleaning device is high, the cleaning water amount is too large, and the cleaning effect is poor; 4. the data acquisition point positions are few, the dynamic parameters are insufficient, so that the basic automation can be realized only according to simple signal feedback during the daily operation of the equipment, and the fault judgment, state analysis, automatic working mode selection and basic fault automatic elimination capability are lacked. And because the working pressure is high, the pipeline/filter cloth is worn quickly, a slurry inlet is easy to block, the filter cloth cannot be cleaned completely or the water consumption is large, the fault rate is high, the water content of the sludge is unstable, and the unattended operation in the whole running process is difficult to realize.
Disclosure of Invention
The invention aims to provide an intelligent control method and system for a plate-and-frame filter press, which solve the problem of low automation degree of the existing plate-and-frame filter press.
The invention adopts the following technical scheme:
an intelligent control method of a plate and frame filter press comprises the following steps:
collecting material concentration and liquid level; when the material concentration and the liquid level exceed the set upper limit values, the filter press automatically enters a feeding and filter pressing link; when the material concentration and the liquid level are lower than the set lower limit values, the filter press automatically stops after the filter pressing is finished; when the material concentration and the liquid level are between the upper limit value and the lower limit value, the filter press automatically and circularly feeds and presses;
collecting the feeding flow and the feeding pressure; when the feeding flow exceeds the normal flow and the feeding pressure cannot rise after a period of time delay, judging that the pipeline or the filter plate leaks, automatically stopping feeding and alarming;
collecting material concentration c and feeding flow Q, combining the volume V, the water content m and the specific gravity s.g of a filter chamber of a filter press, calculating the longest filter pressing time t = (V = (1-m) × s.g)/c = Q required by the filter press, and automatically setting;
collecting the material concentration c and the feeding flow Q, and predicting the water content m = [ 1- (c × Q)/s.g/V ] 100% by combining the volume V of a filter chamber of a filter press and the specific gravity s.g;
collecting the turbidity and flow of the filtrate; judging the filtrate to be leaked when the turbidity of the filtrate exceeds the rated turbidity; the difference value between the filtrate flow and the feeding flow exceeds a rated value and is judged to be leakage;
collecting the surface image of the filter cloth during each cleaning, automatically judging whether to carry out secondary cleaning, transferring to filter pressing, stopping and prompting to replace the filter cloth through image analysis;
the positions of the filter plates are positioned by induction, and the filter plates are automatically corrected by pulling in a way of clamping by a cleaning trolley and releasing and recompressing by a main push plate;
establishing an intelligent analysis and decision model of a plate-and-frame filter press:
judging whether the feeding pipe, the feeding pump and the filter cloth are blocked or damaged according to the variation trend of the feeding flow, the feeding pressure and the filtrate flow at each time, intelligently selecting a pipeline and the filter cloth to be washed, and prompting to overhaul after invalidation;
analyzing the service cycle of the filter cloth according to the filtration times, the turbidity of the filtrate, the change trend of the filtrate flow and the change of the surface image of the filter cloth, and prompting replacement;
according to the magnetic positioning data of the filter plate and the abnormal grating statistics, the deviation and dislocation of the filter plate are analyzed, the loosening-pressing and the self-regulation are intelligently selected, and after the deviation and the self-regulation are invalid, the deformation or the distortion of the frame of the filter press is prompted, and the safety risk of the structure is prompted.
Furthermore, the predicted water content is used for optimizing and adjusting the filter pressing time.
Further, the predicted water content is used to calculate the amount of oven dry filtrate.
An intelligent control system of a plate-and-frame filter press for realizing the intelligent control method of the plate-and-frame filter press comprises:
the material concentration sensor and the water level sensor are arranged in the concentration tank and used for collecting the material concentration and the liquid level;
the first flow sensor and the pressure sensor are arranged on the feeding pipe and used for acquiring the feeding flow and the feeding pressure;
the turbidity sensor and the second flow sensor are arranged at the filtrate discharge port and are used for collecting the turbidity of the filtrate and the flow of the filtrate;
the visual sensor is arranged on the cleaning trolley and used for collecting the surface image of the filter cloth;
the magnetic and grating sensors are arranged on the filter plates, the frame and the pull plate handcart and are used for sensing and positioning the positions of the filter plates;
an intelligent analysis and decision model of a plate and frame filter press for receiving collected data and controlling the filter press according to the intelligent control method of a plate and frame filter press as claimed in any one of claims 1 to 3.
Compared with the prior art, the invention has the following advantages and beneficial effects:
the invention can realize the autonomous control of the plate-and-frame filter press and complete intelligent operation.
Drawings
FIG. 1 is a schematic view of an input acquisition of the present invention;
FIG. 2 is a schematic diagram of the intelligent analysis and decision model of the present invention;
fig. 3 is a schematic diagram of the output implementation of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention. In addition, the technical features involved in the embodiments of the present invention described below may be combined with each other as long as they do not conflict with each other.
The invention relates to all places needing to extract high solid content by using a dehydration process, in particular to a method for realizing full-process automatic operation and intelligent control and adjustment of each link by using plate-frame filter pressing dehydration equipment.
The invention takes the integral intelligent dehydration system as a target direction, and the filter press expands the external sensing capability by additionally arranging sensors such as flow, pressure, turbidity and the like on a feed pipe and a liquid outlet pipe of the filter press, additionally arranging sensors such as sludge concentration, liquid level and the like on a concentration tank, and additionally arranging sensors such as images, magnetism, gratings and the like on a cleaning trolley, a filter plate, a frame and a pull plate handcart; performing relevance analysis on the acquired data and the dehydration step, and searching the application range and functions of the data; establishing intelligent analysis models which are output by the plate-and-frame filter press in different steps under the condition of multiple parameters, and generating and implementing corresponding strategies by combining model analysis results and application practices; and performing reliability analysis, integrated form and intelligent operation control program development on the basis.
The technical scheme of the invention is as follows:
(1) The perception capability of the feeding end is expanded. The feed pump front-end slurry pretreatment (sludge concentration, which can collect feed concentration and liquid level of a concentration tank) process feedback is digitalized.
(2) The filter pressing process is controlled, the filter plate is positioned and the deviation is corrected intelligently, the filter liquid running and the filtrate running are automatically handled intelligently, and the filter cloth is cleaned intelligently and judged and implemented.
(3) The whole dewatering system with the filter press as the center is intelligently controlled and optimized. The method comprises the steps of establishing an intelligent analysis model under a multi-parameter condition through acquisition, analysis and algorithm optimization of omnidirectional data, generating a corresponding strategy by combining experience data values of a database, and implementing the strategy, as shown in fig. 1, 2 and 3, so that the whole automatic control system of the filter press has higher intelligent control capacity of intelligent analysis, decision, implementation, feedback learning, adjustment and implementation, and the intelligent dehydration system is formed by integrating peripheral auxiliary facilities of the filter press in a comprehensive manner.
The embodiment of the invention is as follows:
1. the filter press automatically enters a feeding and filter pressing link when the material concentration and the liquid level exceed set upper limit values by arranging a material concentration sensor and a water level sensor in the previous process; when the material concentration and the liquid level are lower than the set lower limit values, the filter press automatically stops after the filter pressing is finished; when the material concentration and the liquid level are between the upper limit value and the lower limit value, the filter press automatically and circularly feeds and filters materials (different material properties, different tank types and different set values).
2. Through setting up flow sensor, pressure sensor at the inlet pipe, gather the feeding flow, combine feeding pressure's change to judge whether normal, if exceed normal flow, and feeding pressure can't rise after a period of time of delay, judge that pipeline or filter plate appear leaking, the automatic shutdown feeding and report to the police.
3. The longest required filter pressing time t is calculated by collecting the material concentration c and the feeding flow Q and combining the volume V of the filter chamber of the filter press, the water content m of the dewatered sludge and the specific gravity s.g, and the longest required filter pressing time t is automatically set.
Calculating the formula: [ V (1-m) × s.g ]/c × Q = t
4. And (4) performing composite calculation through the feeding flow Q, the feeding concentration c and the volume V of the filter chamber of the filter press, and predicting the water content m. If the feeding flow and the filtrate flow are continuously reduced and the feeding concentration is combined, the moisture content of the dewatered sludge can be predicted (the functions of (1) counting the amount of the oven dry sludge, (2) optimizing and adjusting the filter pressing time and (3) providing suggestions for improving the moisture content).
Calculating the formula: [ 1- (c × Q)/s.g/V ] 100% = m =
5. A turbidity sensor and a flow sensor are arranged at a filtrate outlet, the turbidity index of the filtrate is detected, and the filtrate is judged to be leaked if the turbidity exceeds the rated turbidity; and (4) judging that the difference value between the filtrate flow and the feeding flow Q exceeds a rated value as leakage.
6. The visual sensor is arranged on the cleaning trolley, so that the surface image of the filter plate is collected during cleaning each time, and whether secondary cleaning, filter pressing and shutdown are carried out or not is automatically judged through image analysis software, and filter cloth replacement is prompted.
TABLE 1 logic analysis method table for cleaning of filter cloth
7. The positions of the filter plates are positioned by setting magnetism and grating sensors on the filter plates, the frame and the pull plate handcart in an induction way, and the problem of automatic correction of the filter plate inclination is solved by clamping the trolley and releasing and recompressing the main push plate
8. And establishing an intelligent analysis and decision model for realizing the operation mode of the plate-and-frame filter press under the condition of multiple parameters based on an artificial intelligence technology.
8.1 analyzing the blocking or damage possibility of a feeding pipe, a feeding pump and filter cloth according to the variation trend of the feeding flow Q, the feeding pressure P and the filtrate flow Q at each time, intelligently selecting a pipeline and the filter cloth to wash, and prompting to overhaul after invalidation;
TABLE 2 clogging logic analysis method TABLE
| Logical combination | Feed rate Q | Feed pressure P | Flow rate q of filtrate | Logic judgment | Output of | Prompting |
| 1 | Is low in | Is low in | Is low in | Dredge pump block | Stopping the machine, automatically flushing the mud pipe | Invalid prompt for overhaul |
| 2 | Is low in | Height of | Is low in | Mud pipe blockage | Stopping the machine, automatically flushing the mud pipe | Invalid prompt for overhaul |
| 3 | Low/medium | Middle/high | Low/medium | Filter cloth blockage | Stopping and flushing filter cloth | Invalid prompt replacement |
| 4 | Height of | Is low with | Height of | Breakage of filter cloth | Stopping the machine | Prompt for replacement |
| …… | …… | …… | …… | …… | …… | …… |
8.2 analyzing the service cycle of the filter cloth according to the filtering times N, the filtrate turbidity NTU, the change trend of the filtrate flow q and the change of the picture of the filter cloth visual sensor, and prompting to replace;
TABLE 3 Filter cloth replacement logic analysis method Table
And 8.3, analyzing the offset and dislocation of the filter plate according to the magnetic positioning data of the filter plate and the abnormal grating statistics, intelligently selecting to loosen and compress, automatically adjusting, and indicating that the frame of the filter press has the possibility of deformation or distortion after invalidation so as to prompt the safety risk of the structure.
Table 4 method for filter plate logic analysis
| Logical combination | Magnetic positioning% | Grating barrier | Logic judgment | Output the output | Prompting |
| 1 | 100％ | Is free of | Normal filter plate | Is composed of | Is free of |
| 2 | ＜100％ | Is free of | Failure in positioning of filter plate | Unclamping and recompressing | Invalid prompt for overhaul |
| 3 | ＜100％ | Is provided with | Frame deformation | Stop machine and alarm | Immediate maintenance |
| …… | …… | …… | …… | …… | …… |
It will be understood by those skilled in the art that the foregoing is merely a preferred embodiment of the present invention, and is not intended to limit the invention, and that any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included within the scope of the present invention.
Claims (4)
1. An intelligent control method for a plate and frame filter press is characterized by comprising the following steps:
collecting material concentration and liquid level; when the material concentration and the liquid level exceed the set upper limit values, the filter press automatically enters a feeding and filter pressing link; when the material concentration and the liquid level are lower than the set lower limit values, the filter press automatically stops after the filter pressing is finished; when the material concentration and the liquid level are between the upper limit value and the lower limit value, the filter press automatically and circularly feeds and presses;
collecting the feeding flow and the feeding pressure; when the feeding flow exceeds the normal flow and the feeding pressure cannot rise after a period of time delay, judging that the pipeline or the filter plate leaks, automatically stopping feeding and alarming;
collecting material concentration c and feeding flow Q, combining the volume V, the water content m and the specific gravity s.g of a filter chamber of a filter press, calculating the longest filter pressing time t = (V = (1-m) × s.g)/c = Q required by the filter press, and automatically setting;
collecting the material concentration c and the feeding flow Q, and predicting the water content m = [ 1- (c × Q)/s.g/V ] 100% by combining the volume V of a filter chamber of a filter press and the specific gravity s.g;
collecting the turbidity and flow of the filtrate; judging the filtrate to be leaked when the turbidity of the filtrate exceeds the rated turbidity; the difference value between the filtrate flow and the feeding flow exceeds a rated value and is judged to be leakage;
collecting the surface image of the filter cloth during each cleaning, automatically judging whether to carry out secondary cleaning, transferring to filter pressing, stopping and prompting to replace the filter cloth through image analysis;
the positions of the filter plates are positioned by induction, and the filter plates are automatically corrected by pulling in a way of clamping by a cleaning trolley and releasing and recompressing by a main push plate;
establishing an intelligent analysis and decision model of the plate-and-frame filter press:
judging whether the feeding pipe, the feeding pump and the filter cloth are blocked or damaged according to the variation trend of the feeding flow, the feeding pressure and the filtrate flow at each time, intelligently selecting a pipeline and the filter cloth to be washed, and prompting to overhaul after invalidation;
analyzing the service cycle of the filter cloth according to the filtration times, the turbidity of the filtrate, the change trend of the filtrate flow and the change of the image on the surface of the filter cloth, and prompting the replacement;
according to the magnetic positioning data of the filter plate and the abnormal grating statistics, the deviation and dislocation of the filter plate are analyzed, the loosening-pressing and the self-regulation are intelligently selected, and after the deviation and the self-regulation are invalid, the deformation or the distortion of the frame of the filter press is prompted, and the safety risk of the structure is prompted.
2. The intelligent control method of a plate and frame filter press according to claim 1, wherein the predicted water content is used for optimizing and adjusting the filter pressing time.
3. The intelligent control method of a plate and frame filter press according to claim 1, wherein the predicted water content is used to calculate the amount of oven dry filter.
4. An intelligent control system of a plate-and-frame filter press for implementing the intelligent control method of a plate-and-frame filter press according to any one of claims 1 to 3, the system comprising:
the material concentration sensor and the water level sensor are arranged in the concentration tank and used for collecting the material concentration and the liquid level;
the first flow sensor and the pressure sensor are arranged on the feeding pipe and used for acquiring the feeding flow and the feeding pressure;
the turbidity sensor and the second flow sensor are arranged at the filtrate discharge port and are used for collecting the turbidity of the filtrate and the flow of the filtrate;
the visual sensor is arranged on the cleaning trolley and used for collecting the surface image of the filter cloth;
the magnetic and grating sensors are arranged on the filter plates, the frame and the pull plate handcart and are used for sensing and positioning the positions of the filter plates;
an intelligent analysis and decision model of a plate and frame filter press for receiving collected data and controlling the filter press according to the intelligent control method of a plate and frame filter press as claimed in any one of claims 1 to 3.
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| CN202211397333.3A CN115671818A (en) | 2022-11-09 | 2022-11-09 | Intelligent control method and system for plate-and-frame filter press |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116621194A (en) * | 2023-07-20 | 2023-08-22 | 山东鲁泰化学有限公司 | Method and device for recycling salt mud NaCl in chlor-alkali production |
| CN117861283A (en) * | 2024-01-23 | 2024-04-12 | 杭州安永环保科技有限公司 | Feeding detection device, detection method and filter press |
| CN117902797A (en) * | 2024-03-20 | 2024-04-19 | 深圳市深水水务咨询有限公司 | Dehydration treatment method for high-organic matter sludge |
-
2022
- 2022-11-09 CN CN202211397333.3A patent/CN115671818A/en active Pending
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116621194A (en) * | 2023-07-20 | 2023-08-22 | 山东鲁泰化学有限公司 | Method and device for recycling salt mud NaCl in chlor-alkali production |
| CN116621194B (en) * | 2023-07-20 | 2023-10-10 | 山东鲁泰化学有限公司 | Method and device for recycling salt mud NaCl in chlor-alkali production |
| CN117861283A (en) * | 2024-01-23 | 2024-04-12 | 杭州安永环保科技有限公司 | Feeding detection device, detection method and filter press |
| CN117861283B (en) * | 2024-01-23 | 2024-06-21 | 杭州安永环保科技有限公司 | Feeding detection device, detection method and filter press |
| CN117902797A (en) * | 2024-03-20 | 2024-04-19 | 深圳市深水水务咨询有限公司 | Dehydration treatment method for high-organic matter sludge |
| CN117902797B (en) * | 2024-03-20 | 2024-06-07 | 深圳市深水水务咨询有限公司 | Dehydration treatment method for high-organic matter sludge |
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