Water purifier with filter membrane service life monitoring and alarming functions

Abstract

The invention discloses a water purifier with filter membrane service life monitoring and alarming functions, and belongs to the technical field of water treatment equipment. The water purifier comprises a water pool combination, a purified water storage tank, a cyclone desander, an emptying pipe, a chemical box, an electric control box, a filter, a flow meter, a membrane shell, a centrifugal pump, an ultraviolet sterilizer and an overflow pipe. A flow meter, a filter and a membrane shell are connected with an electric cabinet, a filter membrane service life monitoring model is constructed, and the filter inlet and outlet pressure difference, the accumulated water purification amount and the water quality change parameter serve as service life judgment variables, so that real-time monitoring of the service life of the filter membrane is achieved. A service life prediction and threshold value alarm module is arranged in the electric control box, the filter membrane blocking degree is evaluated according to monitoring data, service life prediction is carried out, and when the service life of the filter membrane is close to a threshold value or meets a replacement condition, sound and light or remote communication alarm prompt is automatically sent out. The method can effectively reduce the abnormal use risk of the filter membrane, improve the water purification operation stability and the filter membrane replacement scientificity, reduce the maintenance cost, and is suitable for an industrial water purification system.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of water treatment equipment, and particularly relates to a water purifier with filter membrane life monitoring and alarm function. BACKGROUND

[0002] With the increasing requirements of industries such as precision manufacturing, food and medicine, chemical and metallurgy, new energy and data center on water quality stability and reliability, industrial water purification systems generally adopt a multi-unit series-parallel system of pretreatment, membrane separation and post-treatment. As the core component, the performance attenuation of the membrane separation unit mainly reflects in three dimensions of flux reduction, transmembrane pressure difference increase and desalination rate decrease. Traditional operation and maintenance practices mainly rely on experience-based periodical replacement and passive alarm. The experience-based periodical method is to replace the membrane element according to the cumulative running time or water flow, ignoring the fluctuations of the inlet water quality, seasonal changes, reagent addition deviation and operating conditions difference. This method either wastes materials by premature replacement or affects water quality by delayed replacement.

[0003] The life management strategy of the filter membrane of some water purifiers is relatively extensive, and the cumulative running time or cumulative water flow is often used as the replacement benchmark without considering the seasonal fluctuations of the inlet water quality, the differences in pollutant composition and the changes in operating conditions, resulting in waste by premature replacement or affecting water quality by delayed replacement. In addition, most of them only set a single threshold alarm based on conductivity or transmembrane pressure difference, which cannot identify the different performances of organic pollution, biological pollution, colloidal pollution and scaling pollution, and cannot reflect the changes in the life cycle of the membrane. The existing water purifiers generally do not have the ability to model the trend and predict the remaining life of the membrane element from the production period, stable period, attenuation period to failure period, and cannot arrange maintenance and in-situ automatic cleaning plans in advance. SUMMARY

[0004] The present application aims to overcome the shortcomings of the prior art and solve the problems of single monitoring dimension, inability to predict life, delayed alarm and inability to link with maintenance in the life monitoring of filter membranes of existing industrial water purifiers. The present application provides a water purifier with filter membrane life monitoring and alarm function, which is comprehensive in monitoring, has life prediction and alarm functions, and realizes the whole process management of filter membranes from operation state diagnosis, life prediction to maintenance linkage.

[0005] The present application adopts the following technical solution: a water purifier with filter membrane life monitoring and alarm function, comprising a water tank combination, a water purification storage tank, a cyclone sand remover, a chemical tank, an electric control box, a filter, a flow meter, a membrane shell, an ultraviolet sterilizer, a filter membrane life monitoring and alarm system,

[0006] The water tank combination comprises a sedimentation tank and a flocculation tank, provides raw water of a system; a cyclone sand remover and a filter constitute a pretreatment unit, which is used for removing silt and suspended particles; a membrane assembly is arranged in a membrane shell, which is a core separation unit; an ultraviolet sterilizer is used for end disinfection; a clean water storage tank is used for storing clean water after treatment; a medicine box is used for adding scale inhibitors, bactericides or flocculants; a centrifugal pump provides water flow pressure power, so that water generates a transmembrane pressure difference through the membrane shell; a flow meter is used for monitoring water production and concentrated water discharge, so as to realize closed loop calculation of flow;

[0007] The filter membrane life monitoring and alarm system comprises a data acquisition module for acquiring clean water operation parameters, a life evaluation module for calculating filter membrane health degree, a pollution identification module for identifying pollution types, and an alarm linkage module for executing alarm strategies.

[0008] The data acquisition module is used for acquiring a transmembrane pressure difference, water production flux, desalination rate, raw water quality parameters, medicament addition amount, operation time and cleaning records.

[0009] The life evaluation module models a whole cycle of a filter membrane from production to failure based on a filter membrane health degree index, the filter membrane health degree index is composed of basic performance attenuation, pollution damage and cleaning recovery, and is used for reflecting the health degree of the membrane assembly and outputting life prediction results.

[0010] The pollution identification module identifies pollution types based on transmembrane pressure difference, flux, desalination rate and raw water quality change characteristics, and generates corresponding cleaning or maintenance strategies.

[0011] The alarm linkage module executes graded early warning, cleaning suggestion or shutdown alarm based on health degree grades, and can link emptying pipes and a medicament adding system, so as to realize unqualified water discharge and automatic cleaning execution.

[0012] According to another embodiment of the application or any of the foregoing embodiments, the data acquisition module comprises pressure sensors, flow meters and conductivity sensors, one pressure sensor is arranged before and after the filter respectively, and is used for detecting filter clogging; two flow meters are arranged between the membrane shell and the ultraviolet sterilizer and at a clean water output end respectively; a conductivity sensor is arranged between the clean water storage tank and the membrane shell.

[0013] According to another embodiment of the application or any of the foregoing embodiments, the pollution identification module judges pollution types according to combined characteristics of transmembrane pressure difference growth rate, desalination rate change, water production flux change, raw water turbidity, conductivity and medicament addition change.

[0014] According to another embodiment of the application or any of the foregoing embodiments, the water tank combination is connected with emptying pipes at the bottom, and the sedimentation tank and the flocculation tank are cleaned; an overflow pipe is arranged on the top of the clean water storage tank and is connected to the water tank combination.

[0015] According to still another embodiment of the application or any of the preceding embodiments, the water purifier further comprises an online cleaning system, a cleaning pipeline of the online cleaning system being connected to the inlet and outlet positions of the membrane shell, and a switching valve being used to switch between a system operation mode and a cleaning mode; in the cleaning mode, the water production side and the concentrated water side can form a closed loop or a discharge circuit with the chemical tank and the emptying pipe, and the chemical dosage, the chemical addition time and the cycle cleaning time are automatically adjusted according to the pollution type and the cleaning scheme, so as to ensure the cleaning effect and safety.

[0016] The beneficial effects of the present application are as follows:

[0017] 1. The water purifier with filter membrane life monitoring and alarm function disclosed in the present application can realize early warning, maintenance prompt, operation and maintenance work order distribution, automatic parameter adjustment or cleaning program execution, and can change from passive maintenance to active maintenance, thereby reducing the risk of shutdown and substandard water quality. Through accurate prediction of membrane failure and optimal replacement window, unnecessary early replacement can be reduced, material cost can be reduced, water quality risk and energy waste caused by operation lag can be avoided, and overall operation cost can be reduced.

[0018] 2. The scheme of the present application can be applied to various membrane separation processes such as ultrafiltration, nanofiltration and reverse osmosis, and can be compatible with traditional water purification equipment structure, so that intelligent upgrading can be realized without large-scale modification, and the applicability is strong. BRIEF DESCRIPTION OF DRAWINGS

[0019] Figure 1 FIG. 1 is a perspective view of the water purifier with filter membrane life monitoring and alarm function according to the present application;

[0020] Figure 2 FIG. 2 is a top view of the water purifier with filter membrane life monitoring and alarm function according to the present application;

[0021] Figure 3 FIG. 3 is an enlarged schematic view of the membrane shell, the ultraviolet sterilizer and the filter according to the present application;

[0022] Figure 4 FIG. 4 is a purification process schematic view of the water purifier with filter membrane life monitoring and alarm function according to the present application;

[0023] In the figure, 1 is a water tank combination, 2 is a water purification tank, 3 is a cyclone sand remover, 4 is an emptying pipe, 5 is a chemical tank, 6 is an electric control box, 7 is a filter, 8 is a flow meter, 9 is a membrane shell, 10 is a centrifugal pump, 11 is an ultraviolet sterilizer, and 12 is an overflow pipe. DETAILED DESCRIPTION

[0024] The technical solutions in the embodiments of the present application will be clearly and completely described with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments of the present application. Based on the embodiments of the present application, all other embodiments obtained by a person of ordinary skill in the art without creative work fall within the protection scope of the present application.

[0025] As shown in the drawings, Figure 1 A water purifier with filter membrane life monitoring and alarm function, comprising a water pool combination 1, a purified water storage tank 2, a cyclone sand remover 3, a medicine box 5, an electric control box 6, a filter 7, a flow meter 8, a membrane shell 9, an ultraviolet sterilizer 11, a filter membrane life monitoring and alarm system. It also includes an online cleaning system. The cleaning pipeline of the online cleaning system is connected to the inlet and outlet positions of the membrane shell 9. The system operating mode and the cleaning mode are converted through a switching valve. In the cleaning mode, the water production side and the concentrated water side can form a closed loop or a discharge circuit with the medicine box 5 and the emptying pipe 4. The amount of medicament, the addition time and the cycle cleaning time are automatically adjusted according to the pollution type and the cleaning scheme to ensure the cleaning effect and safety.

[0026] As shown in the drawings, Figure 2 , 3 The water pool combination 1 comprises a sedimentation tank and a flocculation tank, which provide raw water for the system. The cyclone sand remover 3 and the filter 7 constitute a pretreatment unit for removing mud and suspended particles. The membrane shell 9 is provided with a membrane assembly, which is the core separation unit. The ultraviolet sterilizer 11 is used for terminal disinfection. The purified water storage tank 2 is used for storing the treated purified water. The medicine box 5 adds scale inhibitor, bactericide or flocculant. The centrifugal pump 10 provides water flow boosting power to generate transmembrane pressure difference through the membrane shell 9. The flow meter 8 is used to monitor the water production and the concentrated water discharge, and to realize flow closed loop calculation. The water pool combination 1 is connected with the emptying pipe 4 at the bottom, which is used to clean the sedimentation tank and the flocculation tank. The top of the purified water storage tank 2 is provided with an overflow pipe 12 connected to the water pool combination 1.

[0027] The filter membrane life monitoring and alarm system comprises a data acquisition module for acquiring purified water operation parameters, a life evaluation module for calculating filter membrane health degree, a pollution identification module for identifying pollution type, and an alarm linkage module for executing alarm strategy.

[0028] The data acquisition module is used to acquire transmembrane pressure difference, water production flux, desalination rate, raw water quality parameter, medicament addition amount, operation time and cleaning record. The data acquisition module comprises a pressure sensor, the flow meter 8 and a conductivity sensor. One pressure sensor is arranged before and after the filter 7, which is used to detect the blockage of the filter 7. The flow meter 8 has two, which are respectively installed between the membrane shell 9 and the ultraviolet sterilizer 11 and at the purified water output end. The conductivity sensor is installed between the purified water storage tank 2 and the membrane shell 9.

[0029] The life evaluation module models the whole cycle of the filter membrane from production to failure based on a filter membrane health index, the filter membrane health index is composed of basic performance attenuation, pollution damage and cleaning recovery, and is used for reflecting the health degree of the membrane module and outputting a life prediction result.

[0030] The pollution identification module identifies the pollution type based on the transmembrane pressure difference, flux, desalination rate and raw water quality change characteristics, and generates a corresponding cleaning or maintenance strategy.

[0031] The alarm linkage module performs graded early warning, cleaning suggestion or shutdown alarm based on the health degree level, and can link the emptying pipe 4 and the dosing system to realize unqualified water discharge and automatic cleaning execution.

[0032] The working principle of the present application is as follows:

[0033] The present application realizes real-time monitoring and residual life prediction of the membrane separation unit by arranging various online sensors at key process nodes of the water purifier, combining data fusion processing, filter membrane health evaluation model and life prediction algorithm, and realizing performance attenuation trend identification and operation and maintenance decision linkage.

[0034] First, configure monitoring units such as pressure sensors, flow meters 8 and conductivity sensors in the core process of the water purifier. The pressure sensors are arranged at the inlet and outlet of the membrane element, respectively, for collecting the instantaneous pressure values at the inlet and outlet of the membrane, and the transmembrane pressure difference is calculated by difference, which can reflect the degree of membrane surface pollution, scaling or blockage; the flow meters 8 are arranged at the inlet and outlet of the membrane, respectively, for monitoring the changes of the inlet flow and product water flux, and the trend of membrane flux attenuation can be judged by comparing the two, and the change of system recovery rate can be identified; the conductivity sensor is arranged at the outlet of the product water, for monitoring the conductivity index of the purified water, and the desalination rate can be calculated by comparing the conductivity of the inlet and outlet, which is used to judge whether the membrane separation performance is decreased. The above-mentioned multiple physical quantity parameters are transmitted to the data acquisition module in the electric control box 6 through wired or wireless mode, realizing real-time signal input.

[0035] Secondly, the data preprocessing unit is arranged in the electric control box 6, which is used for calibrating, filtering, removing abnormal data and compensating missing data of the original monitoring data, so that the input requirements of model calculation are met. Specifically, dynamic drift correction is performed on the pressure and flow data, and outlier detection and correction are performed on the conductivity mutation data, so as to avoid misjudgment caused by sensor error and valve movement as transient interference. At the same time, the system also has data fusion function, which normalizes multiple source data such as pressure, flow, conductivity, temperature, running time and cumulative water production, and forms a continuous running state sequence through time window technology, thereby providing a basis for life prediction.

[0036] Thirdly, the application introduces a filter health evaluation model based on multi-index fusion. The model integrates the growth rate of transmembrane pressure difference, the attenuation rate of flux and the decline amplitude of desalination rate, constructs a multi-dimensional health score H, and adjusts the characteristics weight adaptively, so that the model can dynamically adapt to different running water quality conditions. The model divides the performance cycle of the filter into an initial adaptation period, a stable running period, a performance attenuation period and a failure period, and can identify the pollution type. For example, when the transmembrane pressure difference rises rapidly and the desalination rate is normal, it is determined that the pollution is caused by particles or colloids; when the desalination rate decreases significantly and the transmembrane pressure difference changes little, it is determined that the pollution is caused by organic or chemical damage; when all the three indexes deteriorate at the same time, it indicates that the filter has entered the failure period. Compared with the traditional water purifier which triggers alarm by using a single threshold, the application can greatly improve the accuracy of state evaluation through multi-dimensional linkage analysis.

[0037] Fourthly, the application further constructs a filter residual life prediction algorithm. The algorithm is based on the health trend curve, and combines statistical modeling or machine learning methods (such as regression model or recursive prediction model) to predict the residual available time or residual water treatment capacity of the filter. When the predicted life approaches the preset warning threshold, the system prompts the operator to perform chemical cleaning, backwashing or operation parameter optimization; when the predicted life is lower than the alarm threshold, the system will automatically link the sound and light alarm module, and can execute shutdown protection or switch to the standby membrane group according to the set strategy. Through life cycle prediction, the application can effectively avoid the waste of resources caused by relying on experience to set a fixed replacement cycle, or the problem of substandard water quality caused by delayed replacement, thereby realizing the dual improvement of economy and safety.

[0038] Finally, the application integrates monitoring, analysis and control into an intelligent closed-loop control system. The electric control box 6 receives detection signals and calculates model output, and executes corresponding control strategies according to the life state level, including triggering cleaning program as needed, adjusting operation parameters, external communication reporting and local alarm, thereby realizing closed-loop management of the filter from operation, diagnosis to maintenance. The working principle of the application enables the water purifier to have active diagnosis and predictive maintenance capability, and is particularly suitable for industrial application scenarios with high requirements for water quality stability, which can significantly improve the running stability of the membrane system, reduce the operation and maintenance cost and prolong the service life of the filter.

[0039] The above shows and describes the basic principles, main features and advantages of the present application. Those skilled in the art should understand that the above-mentioned embodiments are only for illustrating the technical concepts and characteristics of the present application, and the purpose is to enable those skilled in the art to understand the content of the present application and implement it, and cannot limit the protection scope of the present application. Any equivalent changes or modifications made according to the spirit and essence of the present application should be covered within the protection scope of the present application.

Claims

1. A water purifier with filter membrane life monitoring and alarm function, comprising a water tank assembly (1), a purified water storage tank (2), a cyclone sand separator (3), a medicine tank (5), an electrical control box (6), a filter (7), a flow meter (8), a membrane housing (9), an ultraviolet sterilizer (11), and a filter membrane life monitoring and alarm system, characterized in that: The water tank assembly (1) includes a sedimentation tank and a flocculation tank to provide raw water for the system; a cyclone separator (3) and a filter (7) constitute a pretreatment unit to remove silt and suspended particles; a membrane assembly is installed inside the membrane housing (9) as the core separation unit; an ultraviolet sterilizer (11) is used for end-point disinfection; a purified water storage tank (2) is used to store the treated purified water; a chemical tank (5) is used to add scale inhibitors, bactericides or flocculants; a centrifugal pump (10) provides water flow boosting power, so that water generates transmembrane pressure difference through the membrane housing (9); a flow meter (8) is used to monitor the production water volume and the concentrated water discharge volume to realize closed-loop flow calculation; The filter membrane life monitoring and alarm system includes a data acquisition module for collecting water purification operation parameters, a life assessment module for calculating filter membrane health, a pollution identification module for determining pollution types, and an alarm linkage module for executing alarm strategies. The data acquisition module is used to collect transmembrane pressure difference, permeate flux, desalination rate, raw water quality parameters, reagent dosage, operating time, and cleaning records; The life assessment module models the entire life cycle of the filter membrane from commissioning to failure based on the filter membrane health index. The filter membrane health index consists of basic performance degradation, pollution damage and cleaning recovery, and is used to reflect the health of the membrane module and output life prediction results. The pollution identification module identifies the type of pollution based on transmembrane pressure difference, flux, desalination rate and raw water quality change characteristics, and generates corresponding cleaning or maintenance strategies. The alarm linkage module executes graded early warning, cleaning suggestions or shutdown alarms based on the health level, and can link the drain pipe (4) and the dosing system to realize the automatic execution of unqualified water discharge and cleaning.

2. A water purifier with filter membrane life monitoring and alarm function according to claim 1, characterized in that: The data acquisition module includes a pressure sensor, a flow meter (8) and a conductivity sensor. A pressure sensor is installed before and after the filter (7) to detect the clogging of the filter (7). There are two flow meters (8), which are installed between the membrane housing (9) and the ultraviolet sterilizer (11) and at the purified water output end, respectively. A conductivity sensor is installed between the purified water storage tank (2) and the membrane housing (9).

3. A water purifier with filter membrane life monitoring and alarm function according to claim 1, characterized in that: The pollution identification module determines the type of pollution based on a combination of characteristics including the rate of increase in transmembrane pressure difference, changes in desalination rate, changes in permeate flux, raw water turbidity, conductivity, and changes in reagent dosage.

4. A water purifier with filter membrane life monitoring and alarm function according to claim 1, characterized in that: The bottom of the water tank assembly (1) is connected to a drain pipe (4) for cleaning the sedimentation tank and flocculation tank; the top of the water purification tank (2) is equipped with an overflow pipe (12) connected to the water tank assembly (1).

5. A water purifier with filter membrane life monitoring and alarm function according to claim 1, characterized in that: It also includes an online cleaning system. The cleaning pipeline of the online cleaning system is connected to the inlet and outlet of the membrane housing (9). The system operation mode and cleaning mode are switched by a switching valve. In the cleaning mode, both the permeate side and the concentrate side can form a closed loop or discharge loop with the chemical tank (5) and the drain pipe (4). The dosage, addition time and circulation cleaning time of the chemical are automatically adjusted according to the type of pollution and the cleaning plan to ensure the cleaning effect and safety.

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