A fully automatic water treatment method

Abstract

The application discloses a kind of full-automatic water treatment methods, and full-automatic water treatment system sequentially includes primary water tank, filter, self-cleaning filter, ultrafiltration system, filtered water tank, precision filter, reverse osmosis system, fresh water tank and concentrated water tank;Primary water tank, filtered water tank, fresh water tank and concentrated water tank are controlled by water pump, and reverse osmosis system includes fresh water reverse osmosis and concentrated water reverse osmosis, and is connected with fresh water tank and concentrated water tank respectively;Full-automatic water treatment system is controlled by automatic control program.The application improves the automation degree of operation by full-automatic water treatment system, reduces personnel on-site operation project, ensures process operation safety, reduces labor intensity, realizes automation and reduces people, intelligent and unmanned, to achieve the purpose of reducing people and ensuring safety on site.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of water treatment, and particularly relates to a full-automatic water treatment method. BACKGROUND

[0002] The chemical water treatment process uses surface water (Yellow River water) to remove suspended substances, iron ions and solid particles in water through a multi-medium filter for pretreatment, and the treated water enters an ultrafiltration system to remove proteins, colloids, microorganisms and macromolecular organic matter, and the filtered water enters a reverse osmosis system for further desalination treatment. The principle is that a pressure greater than the osmotic pressure (difference) of a salt-containing water solution is applied to the side of the water solution to allow only water to pass through the reverse osmosis membrane, while the ions and organic matter in the solution are concentrated on the raw water side, thereby achieving the purpose of desalination of the water solution to obtain fresh water. The fresh water enters an ion exchanger for ion exchange to obtain desalted water for use by downstream enterprises.

[0003] At present, the program is not realized in a coherent manner during the operation process of the set process, and manual operation is more in the field, the degree of automation is low, the backwashing and air scrubbing of the filter are completed manually on site; the filter system, the primary water system, the ultrafiltration system and the fresh water system are not provided with interlocking protection, and the operation safety cannot be guaranteed during the operation process. The Yellow River water level needs to be frequently adjusted manually, the start and stop of the reverse osmosis equipment need to manually adjust multiple valves, the workload is large, the personnel are exposed to the field frequently, the supporting dosing system needs to be completed manually, and accurate metering cannot be achieved, which brings risks to the actual operation.

[0004] Patent CN115253484A discloses an automatic control method of V-type filter device, which dynamically analyzes the parameters of backwashing process, involves the relationship between congestion rate, hydraulic load and backwashing cycle, time, optimizes backwashing efficiency; multi-filter pool time sequence cross backwashing, expands the processing load of filter pool from the perspective of software; at the same time, more backwashing water quantity is needed, and a water distribution quantity PID control method matched with the characteristics of centrifugal pump is proposed. The implementation process of the automatic control method is as follows, S1, the influence of congestion rate R abnormality and water quantity mutation factor on backwashing time A\B\C and backwashing cycle T in the sequence of filtration and backwashing process; congestion rate abnormality: R=dY / dt, which represents congestion rate, Y is water loss instrument value, and t is time; the current congestion rate R is detected in the program, and the difference value Et=|R-Rt| is compared with the experience characteristic value Rt; when Et>a|Tt|, it is judged that the current congestion is abnormal, and a is a set coefficient; when congestion abnormality occurs, the backwashing time A\B\C is enlarged, and the washing time is increased; when water quantity mutation occurs, the washing interval cycle T parameter between each pool is shortened in advance when high load water flow F load occurs; when F>130%X, T=90%T0; when F>160%X, T=80%T0; when F>200%X, T=60%T0. T0 is the experience cycle under normal load; S2, multi-filter pool backwashing cross polling load processing; when designing multi-filter pool backwashing cross, the corresponding N pool body design sequence controller array controller U[N] is used for one-to-one correspondence; S3, the water distribution PID control method matched with the characteristics of centrifugal pump corresponding to large water quantity backwashing; when multiple pumps are put into operation, multiple flow curve characteristics are superimposed in time, and a segmented flow / frequency algorithm is used: ① the normal flow interval X and the dead zone interval Xd are determined through pump test; ② when the target flow FmodX=Xd, the flow control enters the low efficiency section L of the dead zone; when the flow control enters the normal high efficiency section H when the flow control enters the normal high efficiency section H; ③ segmented formula: n=F / (X+Xd), n is the number of started pumps; when the low efficiency zone is judged, the previous started pump is low frequency; when the high frequency zone is judged, the previous started pump is high frequency; the total number of pumps under PID control is the current switched running pump; with the increase of flow load, the working conditions of low efficiency and high efficiency appear alternately; and the number of started pumps increases, the high and low fixed frequency, and the PID regulation condition also follows the recursive law.

[0005] The above method uses the relationship between pollution rate, hydraulic load and backwashing cycle, time, optimizes backwashing efficiency, multi-filter pool time sequence cross backwashing, expands the processing load of filter pool from the perspective of software, and needs more backwashing water quantity, and a water distribution quantity PID control method matched with the characteristics of centrifugal pump is proposed. SUMMARY

[0006] In view of the low automation degree and poor safety performance of the prior art water treatment method, the application provides a full-automatic water treatment method, which improves the automation degree of operation, reduces on-site operation items of personnel, ensures the safety of process operation, reduces the labor intensity of personnel, realizes automation and intelligentization, and achieves the purpose of reducing personnel and ensuring safety on site.

[0007] The application is achieved by the following technical solutions:

[0008] A full-automatic water treatment method, a full-automatic water treatment system sequentially comprises a primary water tank, a filter, a self-cleaning filter, an ultrafiltration system, a filtered water tank, a precision filter, a reverse osmosis system, a fresh water tank and a concentrated water tank; the primary water tank, the filtered water tank, the fresh water tank and the concentrated water tank are controlled by a water pump; the reverse osmosis system comprises fresh water reverse osmosis and concentrated water reverse osmosis, and is connected to the fresh water tank and the concentrated water tank respectively; the full-automatic water treatment system comprises the following automatic control programs:

[0009] (1) The liquid level of the primary water tank and the inlet adjustment valve are set in interlock to realize automatic adjustment, and the raw water inlet quantity is automatically adjusted;

[0010] (2) The filter is provided with an alarm device, the high limit alarm value of the filter inlet pressure is 0.3mpa, and the filter alarms when the operating pressure difference is higher than 0.05mpa, and exits to perform backwashing when the value is higher than the alarm value;

[0011] (3) The self-cleaning filter is provided with a self-cleaning program control, the running cumulative time reaches a certain time, the water inlet valve is automatically closed, and sewage is discharged;

[0012] (4) The ultrafiltration system: the inlet pressure of the ultrafiltration system is controlled to be 0.06-0.11mpa;

[0013] (5) The liquid level of the filtered water tank is set to be automatically adjusted, the liquid level of the filtered water tank is maintained, and the inlet pressure of the ultrafiltration system is maintained to be 0.06-0.11mpa;

[0014] (6) The control pressure of the precision filter is 0.16-0.3mpa;

[0015] (7) The reverse osmosis system is provided with a one-key start-stop program control, the outlet slow-opening valve is set to be 30s, the variable frequency boosting rate of the high-pressure pump is 0.06hz / s, the boosting is completed in 10min, and the pressure is reduced at a rate of 0.12hz / s when stopping;

[0016] (8) The liquid level of the concentrated water tank is set to be high and low limit alarm, the liquid level and the variable frequency of the concentrated water high-pressure pump are set to be automatically controlled, the liquid level is maintained to be 1.5m-2.5m, and the concentrated water inlet pressure is maintained to be 0.4mpa-1.55mpa.

[0017] Further, in step (1), when the water tank liquid level is higher than 5m, the small water inlet adjusting valve is automatically closed, and when the water tank liquid level is lower than 5m, the large water inlet adjusting valve is automatically opened, so that the water tank liquid level is maintained at 5m.

[0018] Further, in step (3), the self-cleaning filter is connected with a sewage system, when the sewage system is normally operated, one sewage pump is opened to automatically adjust the sewage pool liquid level and the sewage pump outlet valve, so that the liquid level satisfies 250mm < L < 650mm; when the liquid level is greater than 650mm, another sewage pump is automatically opened.

[0019] Further, in step (3), when the self-cleaning filter is operated for 12 hours, the water inlet valve is automatically closed, the stirring motor is opened to operate for 5 minutes, the sewage valve is opened to discharge sewage for 20 minutes, after the sewage is discharged, the stirring motor is automatically stopped, the sewage valve is automatically closed, and the water inlet valve is opened to operate.

[0020] Further, in step (8), a pressure variable is installed in the concentrated water tank water inlet mother pipe, the frequency conversion of the concentrated water feed pump is automatically controlled according to the pressure, and the control pressure is 0.15-0.3mpa.

[0021] Further, in step (5), the filter water tank liquid level is maintained at 5m, and the filter water tank is provided with high and low limit alarm for the liquid level, and the high and low limit values are 4.5m and 7m respectively.

[0022] Further, the full-automatic water treatment system is provided with an emergency stop system, and the emergency stop system is sequentially one water pump stop, ultrafiltration water inlet mother pipe pressure < 0.06mpa to exit the ultrafiltration system, filter water tank liquid level < 2.5m to stop the filter water pump,

[0023] Further, in step (1), the raw water is the Yellow River water.

[0024] Further, the DCS system monitors the reverse osmosis water conductivity, and online turbidity meters are added at the one water tank, the filter water tank and the reverse osmosis water inlet, so that automatic analysis is realized, and an analysis DCS picture is separately made.

[0025] The beneficial effects obtained by the application are as follows:

[0026] The full-automatic water treatment method fully utilizes the interlocking program, and each operation is performed according to the logical steps, so that all the manual valves which need to be frequently adjusted on the site are replaced by electric valves or regulating valves, so that remote control is realized, the site is no longer manually operated and adjusted, and the purpose of reducing personnel on the site to ensure safety is truly achieved.

[0027] The full-automatic water treatment method improves the automation degree of operation, reduces the personnel on site, ensures the safety of process operation, reduces the labor intensity of personnel, realizes automatic reduction of personnel and intelligent unmanned, and achieves the purpose of reducing personnel on site to ensure safety. BRIEF DESCRIPTION OF DRAWINGS

[0028] Figure 1 Figure 1 is a schematic diagram of the process of the automatic water treatment system;

[0029] Figure 2 Figure 2 is a schematic diagram of the process of the emergency stop program. DETAILED DESCRIPTION

[0030] The present application will be further illustrated by the following specific examples, which are intended to be illustrative only and not limiting of the scope of the present application. After reading the present application, those skilled in the art will be able to affect various modifications to the present application, which are within the scope of the claims appended hereto.

[0031] Figure 1 is a schematic diagram of the process of the automatic water treatment system; Figure 1 Figure 1 shows that the automatic water treatment system comprises, in sequence, a primary water tank, a filter, a self-cleaning filter, an ultrafiltration system, a filtered water tank, a precision filter, a reverse osmosis system, a fresh water tank, and a concentrated water tank. Figure 1 The primary water tank, the filtered water tank, the fresh water tank, and the concentrated water tank are controlled by a water pump. The reverse osmosis system comprises fresh water reverse osmosis and concentrated water reverse osmosis, which are connected to the fresh water tank and the concentrated water tank, respectively. The DCS system monitors the electrical conductivity of the reverse osmosis water, and an online turbidity meter is added at the primary water tank, the filtered water tank, and the reverse osmosis inlet to achieve automatic analysis, and a separate analysis DCS screen is prepared.

[0032] Example 1

[0033] The automatic water treatment system comprises the following automatic control programs to achieve automatic treatment of the Yellow River water. The Yellow River water passes through, in sequence, a primary water tank, a filter, a self-cleaning filter, an ultrafiltration system, a filtered water tank, a precision filter, a reverse osmosis system, a fresh water tank, and a concentrated water tank. The reverse osmosis system comprises fresh water reverse osmosis and concentrated water reverse osmosis, which are connected to the fresh water tank and the concentrated water tank, respectively. The automatic water treatment system comprises the following automatic control programs, which are specifically as follows:

[0034] (1) The liquid level of the primary water tank and the inlet adjustment valve are set in interlock to achieve automatic adjustment. The Yellow River water inlet is automatically adjusted. When the liquid level of the primary water tank is higher than 5 m, the inlet adjustment valve is automatically closed. When the liquid level of the primary water tank is lower than 5 m, the inlet adjustment valve is automatically opened to maintain the liquid level of the primary water tank at 5 m.

[0035] (2) An alarm device is installed on the filter. The high limit alarm value of the filter inlet pressure is 0.3 MPa. When the operating pressure difference is higher than 0.05 MPa, an alarm is given. When the value is higher than the alarm value, the reverse washing is performed.

[0036] (3) The self-cleaning filter is provided with a self-cleaning program control. When the cumulative running time reaches a certain time, the water inlet valve is automatically closed to carry out sewage. The self-cleaning filter is connected to a sewage system. When the sewage system is normally operated, one sewage pump is opened to automatically adjust the sewage pool liquid level and the sewage pump outlet valve, so that the liquid level meets 250mm < L < 650mm. When the liquid level > 650mm, another sewage pump is automatically started. When the self-cleaning filter runs for 12h, the water inlet valve is automatically closed, the stirring motor is opened to run for 5min, the sewage valve is opened to discharge sewage for 20min, and after the sewage is discharged, the stirring motor is automatically stopped, the sewage valve is automatically closed, and the water inlet valve is opened to run;

[0037] (4) The inlet pressure of the ultrafiltration system is controlled to be 0.06-0.11mpa;

[0038] (5) The liquid level of the filtered water tank is automatically adjusted to maintain the filtered water tank liquid level and maintain the inlet pressure of the ultrafiltration system to be 0.06-0.11mpa. The filtered water tank liquid level is maintained at 5m. The high and low limit alarms of the filtered water tank are set. The high and low limit values are 4.5m and 7m respectively;

[0039] (6) The control pressure of the precision filter is 0.16-0.3mpa;

[0040] (7) The reverse osmosis system is provided with a one-key start-stop program control. The outlet slow-opening valve is set to 30s. The variable frequency boosting rate of the high-pressure pump is 0.06hz / s, and the time is 10min. When boosting is completed, the pressure is reduced at a rate of 0.12hz / s.

[0041] (8) The liquid level of the concentrated water tank is set to high and low limit alarms. The liquid level and the variable frequency of the concentrated water high-pressure pump are automatically controlled to maintain the liquid level to be 1.5m-2.5m and ensure that the concentrated water inlet pressure is 0.4mpa-1.55mpa. The concentrated water tank inlet mother pipe is provided with a pressure variable. The variable frequency of the concentrated water feed pump and the pressure are automatically controlled. The control pressure is 0.15-0.3mpa.

[0042] Example 2

[0043] In order to avoid emergency adjustment, an emergency shutdown program is set for the entire system to ensure the safety of the ultrafiltration system and the reverse osmosis system. The flow chart is shown in Figure 2 ;

[0044] By Figure 2It is known that, need to stop parking or get parking permission, send parking instruction, a water pump outage, ultrafiltration water pressure <0.06mpa exit operation, filter after water tank to stop parking liquid level ( <2.5m) after stop running filter after water pump; Follow-up reverse osmosis system (fresh water tank liquid level <2.5m, concentrated water tank liquid level <1.5m), precision filter (import conduit pressure <0.15mpa), sewage pump (sewage tank liquid level less than 250mm) and other equipment to stop parking liquid level received signal after gradually interlock stop running.

Claims

1. A method for fully automatic water treatment, characterized in that, The automatic water treatment system comprises a primary water tank, a filter, a self-cleaning filter, an ultrafiltration system, a filtered water tank, a precision filter, a reverse osmosis system, a fresh water tank and a concentrated water tank; the primary water tank, the filtered water tank, the fresh water tank and the concentrated water tank are controlled by a water pump; the reverse osmosis system comprises fresh water reverse osmosis and concentrated water reverse osmosis, and is connected with the fresh water tank and the concentrated water tank respectively; the automatic water treatment system comprises the following automatic control procedures: (1) The liquid level of the primary water tank and the water inlet adjusting valve are set in interlock to realize automatic adjustment, and the raw water inlet quantity is automatically adjusted; (2) The filter is provided with an alarm device, the high limit alarm value of the filter inlet pressure is 0.3mpa, the alarm is given when the operating pressure difference is higher than 0.05mpa, and the reverse washing is performed when the value is higher than the alarm value; (3) The self-cleaning filter is provided with a self-cleaning program control procedure, the water inlet valve is automatically closed when the operating cumulative time reaches a certain time, and the blow-off is performed; (4) The ultrafiltration system: the inlet pressure of the ultrafiltration system is controlled to be 0.06-0.11mpa; (5) The liquid level of the filtered water tank is set to be automatically adjusted, the liquid level of the filtered water tank is maintained, and the inlet pressure of the ultrafiltration system is maintained to be 0.06-0.11mpa; (6) The control pressure of the precision filter is 0.16-0.3mpa; (7) The reverse osmosis system is provided with a one-key start-stop program control, the outlet slow-opening valve is set to be 30s, the frequency conversion pressure increasing rate of the high-pressure pump is 0.06hz / s, the pressure increasing is completed in 10min, and the pressure decreasing is performed at a rate of 0.12hz / s when the system is stopped; (8) The liquid level of the concentrated water tank is set to be high and low limit alarm, the liquid level and the frequency conversion of the concentrated water high-pressure pump are set to be automatically controlled, the liquid level is maintained to be 1.5-2.5m, and the concentrated water inlet pressure is maintained to be 0.4-1.55mpa.

2. The method of fully automatic water treatment according to claim 1, characterized in that, In step (1), the small water inlet adjusting valve is automatically closed when the liquid level of the primary water tank is higher than 5m, and the large water inlet adjusting valve is automatically opened when the liquid level of the primary water tank is lower than 5m, so that the liquid level of the primary water tank is maintained to be 5m.

3. The method of fully automated water treatment according to claim 1, characterized in that, In step (3), the self-cleaning filter is connected with a blow-off system, one sewage pump is started when the blow-off system normally operates, the liquid level of the sewage pool and the outlet valve of the sewage pump are set in interlock to be automatically adjusted, so that the liquid level satisfies 250mm 4. The method of fully automatic water treatment according to claim 3, characterized in that, In step (3), the self-cleaning filter is connected with a blow-off system, one sewage pump is started when the blow-off system normally operates, the liquid level of the sewage pool and the outlet valve of the sewage pump are set in interlock to be automatically adjusted, so that the liquid level satisfies 250mm 5. The method of fully automated water treatment according to claim 1, characterized in that, In step (8), a pressure variable is installed in the concentrated water inlet mother pipe, the frequency conversion of the concentrated water feed pump is set to be automatically controlled according to the pressure, and the control pressure is 0.15-0.3mpa.

6. The method of fully automated water treatment according to claim 1, characterized in that, In step (5), the liquid level of the filtered water tank is maintained to be 5m, and the high and low limit alarm values of the liquid level of the filtered water tank are set to be 4.5m and 7m respectively.

7. The method of fully automated water treatment according to claim 1, characterized in that, The automatic water treatment system is provided with an emergency stop system, the primary water pump is stopped, the ultrafiltration inlet mother pipe pressure is lower than 0.06mpa to exit the ultrafiltration system, and the filtered water tank liquid level is lower than 2.5m to stop the filtered water pump.

8. The method of fully automated water treatment according to claim 1, characterized in that, In step (1), the raw water is the Yellow River water.

9. The method of fully automated water treatment according to claim 1, characterized in that, DCS system monitors the reverse osmosis water conductivity, and increases the online turbidity instrument at the primary water tank, filtered water tank and reverse osmosis water inlet to realize automatic analysis, and separately makes the analysis DCS picture.

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