CN113559589B - Method for optimizing filter cloth use of filter tank by adding water inlet valve positioner - Google Patents
Method for optimizing filter cloth use of filter tank by adding water inlet valve positioner Download PDFInfo
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- CN113559589B CN113559589B CN202110885797.8A CN202110885797A CN113559589B CN 113559589 B CN113559589 B CN 113559589B CN 202110885797 A CN202110885797 A CN 202110885797A CN 113559589 B CN113559589 B CN 113559589B
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- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title claims abstract description 101
- 239000004744 fabric Substances 0.000 title claims abstract description 69
- 238000000034 method Methods 0.000 title claims abstract description 19
- 238000004140 cleaning Methods 0.000 claims abstract description 103
- 239000007788 liquid Substances 0.000 claims description 59
- 230000002159 abnormal effect Effects 0.000 claims description 7
- 230000000694 effects Effects 0.000 description 11
- 238000001914 filtration Methods 0.000 description 11
- 238000011001 backwashing Methods 0.000 description 7
- 238000009825 accumulation Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000011010 flushing procedure Methods 0.000 description 1
- 238000005457 optimization Methods 0.000 description 1
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D29/00—Filters with filtering elements stationary during filtration, e.g. pressure or suction filters, not covered by groups B01D24/00 - B01D27/00; Filtering elements therefor
- B01D29/62—Regenerating the filter material in the filter
- B01D29/66—Regenerating the filter material in the filter by flushing, e.g. counter-current air-bumps
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D29/00—Filters with filtering elements stationary during filtration, e.g. pressure or suction filters, not covered by groups B01D24/00 - B01D27/00; Filtering elements therefor
- B01D29/60—Filters with filtering elements stationary during filtration, e.g. pressure or suction filters, not covered by groups B01D24/00 - B01D27/00; Filtering elements therefor integrally combined with devices for controlling the filtration
Abstract
The invention discloses a method for optimizing filter cloth use of a filter by adding a water inlet valve positioner. A valve positioner is additionally arranged at the water inlet valve end of the filter; replacing the analog input module in the electric control cabinet with EM AM03; a group of analog quantity output signals are led out from the EM AM03 module and are connected to the analog quantity signal input end of the water inlet valve positioner; the design conversion program converts a signal with the valve opening of 0-100% into a 4-20mA signal and transmits the 4-20mA signal to the valve positioner; when the automatic mode is started, the initial valve opening degree is set to be 25-35% and transmitted to a valve positioner; recording the interval time of the two triggering cleaning before and after the cleaning, comparing the interval time with the optimal cleaning interval time, if the interval time is larger, increasing the opening degree of a water inlet valve, and otherwise, reducing the opening degree of the water inlet valve; when the opening of the water inlet valve is minimum and the time interval between two times of triggering and cleaning is still less than the optimum time, triggering an alarm to prompt that filter cloth needs to be replaced or the water inflow is checked. The optimized design can ensure that the filter cloth is protected and used to the maximum extent.
Description
Technical Field
The invention belongs to the technical field of filter cloth cleaning, and relates to a method for optimizing filter cloth use of a filter by adding a water inlet valve positioner.
Background
The filter cloth used in the vertical piece filter cloth filter chamber needs to be cleaned along with the accumulation of the filtering amount. The service life of the filter cloth used in the filter chamber is consumed along with the accumulation of the filtering amount and the filtering time, and the service life is shortened due to improper use, which means that the filter cloth is excessively cleaned.
The conventional cleaning requirements for filter cloths are mainly two-fold: firstly, the liquid level in the filter tank reaches the condition of high liquid level, and secondly, a preset cleaning period is reached. However, with the use of the filter chamber, the filtering effect of the filter cloth is worse and worse, that is, the amount of filtered water in the same time is less and less, and under the condition of the same water inflow, the frequency of high liquid level is higher and higher, and the times of cleaning the filter cloth are more and more intensive, which causes extra damage to the filter cloth.
The filter cloth cleaning triggering modes are mainly two types: one is that according to the liquid level value in the filter tank, when reaching a certain liquid level, the cleaning operation is carried out; the other is to perform the operation of cleaning the filter cloth on the filter tank within a certain time interval. The filter cloth cleaning device is mainly used in the initial stage of filter tank use, because the filter cloth filtering effect is good, the water filtering amount is large, the liquid level in the filter tank rises slowly, the filter cloth can be cleaned only after the liquid level cleaning, and the filter cloth cleaning device is not reasonable, so that a reasonable cleaning period is set to standardize the filter cloth cleaning frequency. When the filter cloth is used for a period of time, the drainability of the filter cloth gradually deteriorates, the amount of residual water in the tank is large in the same time, the liquid level easily reaches the cleaning liquid level value, the cleaning frequency is more and more frequent, and from the use point of view, once the time interval of triggering the cleaning by the high liquid level is lower than the time interval of the preset period, the cleaning of the filter tank is represented to be in an abnormal state, the condition that the next cleaning is carried out immediately after one cleaning is completed can be seriously occurred, namely the filter tank is always in the cleaning state, so that the service life of the filter cloth is absolutely unfavorable.
How to optimize the times of cleaning the filter cloth from the angle of adjusting the water inflow to achieve a reasonable cleaning effect is a problem to be solved at present.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provide a method for optimizing the times of cleaning filter cloth from the angle of adjusting the water inflow so as to achieve a reasonable cleaning effect, namely a method for optimizing the use of the filter cloth in a filter tank by adding a water inlet valve positioner.
The technical scheme of the invention is as follows:
a method for optimizing filter cloth use of a filter tank by adding a water inlet valve positioner comprises the following steps:
1) Additionally arranging a valve positioner with a specification compatible with the water inlet valve at the water inlet valve end of the vertical filter cloth filter;
2) Replacing an analog input module EM AE04 in the electric control cabinet as EM AM03;
3) A group of analog output signal cables are led out from the EM AM03 module and connected to the analog signal input end of the water inlet valve positioner;
4) In the PLC program, a conversion program is designed, and signals with the valve opening degree of 0% -100% are converted into 4-20mA signals to be transmitted to a valve positioner;
5) Designing a program, when the automatic mode is started, setting the initial valve opening to be 25-35% and transmitting the initial valve opening to a valve positioner to ensure that the filter tank starts to work in a state of relatively low treatment capacity;
6) In the PLC program, recording the time from the start of the automatic mode to the first time when the high liquid level of the filter tank is reached to trigger cleaning; then, recording the interval time of the two times of high liquid level reaching triggering cleaning, namely, recording the time of the two times of high liquid level reaching triggering cleaning (back washing), and subtracting the two times of high liquid level reaching triggering cleaning to obtain the interval time of the two times of high liquid level reaching triggering cleaning; then, the interval time of triggering cleaning when the high liquid level is reached twice and the interval time of optimal cleaning (generally 2 hours) are compared, and the opening of the water inlet valve is adjusted according to the presetting: if the optimal cleaning interval time is longer than the optimal cleaning interval time, the opening degree of the water inlet valve is increased, the smaller the opening degree is set, the finer the adjustment is, and the situation of repeated adjustment cannot occur; on the contrary, if the time is less than the optimal cleaning interval time, the opening degree of the water inlet valve is reduced;
7) In the programming, setting the maximum opening and the minimum opening allowed by the water inlet valve; designing a program, and when the opening of the water inlet valve is the minimum opening, if the interval time between the two times of reaching the high liquid level and triggering the cleaning is still less than the optimal cleaning interval time, triggering an alarm by the PLC system to prompt a user that the filter tank is in an abnormal state and the filter cloth needs to be replaced or the condition of overlarge water inflow needs to be checked.
Further, in step 5), the program is designed to transmit an initial valve opening, preferably set to 30%, to the valve positioner when the automatic mode is activated.
Further, in the step 6), if the interval time between the two times of high liquid level reaching and the two times of high liquid level triggering cleaning is longer than the optimal cleaning interval time, the opening degree of the water inlet valve is increased by 2-8%; on the contrary, if the interval time of the two times of reaching the high liquid level to trigger the cleaning is less than the optimal cleaning interval time, the opening degree of the water inlet valve is reduced by 2-8 percent.
Furthermore, in the step 6), if the interval time between the two times of high liquid level reaching and the two times of high liquid level reaching triggering cleaning is longer than the optimal cleaning interval time, the opening degree of the water inlet valve is increased by 5%; on the contrary, if the interval time of the two times of reaching the high liquid level to trigger the cleaning is less than the optimal cleaning interval time, the opening degree of the water inlet valve is reduced by 5 percent.
Further, in step 6), the optimum cleaning interval time is 2 hours.
Further, in step 7), the maximum allowable opening degree of the water inlet valve is set to 100% in the programming, and the valve is in a fully open state.
Further, in the step 7), in the programming, the allowable minimum opening degree of the water inlet valve is set to be 20%; when the opening of the water inlet valve is 20%, if the interval time between the two times of high liquid level triggering and cleaning is less than the optimal cleaning interval time, the PLC system triggers an alarm to prompt a user that the filter tank is in an abnormal state and the filter cloth needs to be replaced or the condition of overlarge water inflow needs to be checked.
Further, the water inlet valve is a manual and automatic integrated electric valve (manual and automatic integrated electric valve).
The invention has the beneficial effects that:
the invention provides a method for optimizing the use of filter cloth by adding a water inlet valve positioner, detecting and calculating through a program, adjusting the water inflow and optimizing the filter cloth in a vertical filter cloth filter. The water inlet amount can be adjusted by controlling the opening degree of the water inlet valve. The method comprises the steps of recording the interval time of two times of high liquid level reaching triggering cleaning before and after the high liquid level reaching cleaning is automatically realized, namely, recording the time of two times of high liquid level reaching triggering cleaning (back washing) before and after the high liquid level reaching cleaning, subtracting the time of the two times of high liquid level reaching triggering cleaning to obtain the interval time of the two times of high liquid level reaching triggering cleaning before and after the high liquid level reaching cleaning, comparing the interval time with the optimal cleaning interval time, and adjusting the opening of a water inlet valve according to the preset value; if the water inlet valve opening is larger than the optimal period, increasing a certain value until the maximum value is reached; if the water inlet valve opening is less than the optimal period, reducing a certain value until the maximum condition is reached, triggering an alarm, displaying and judging that the filter cloth of the filter tank is in a critical state, and needing to be replaced.
The optimized design of the invention optimizes the times of cleaning the filter cloth from the angle of adjusting the water inflow, thereby achieving a reasonable cleaning effect. The optimization design of the invention is mainly to adjust the filter tank to a correct and proper use program by an intelligent means without human participation, and can ensure that the filter cloth is protected and used to the maximum extent.
The method for optimizing the use of the filter cloth by adding the water inlet valve positioner in the filter tank has the following advantages:
1. the debugging time is reduced, and the filter can be automatically adjusted to operate in an optimal state through the program design of the system (the optimal state refers to the optimal back flushing time interval, and the optimal filter cloth environment is used); generally, the debugging period of a vertical filter is about 3-4 days, and the debugging of the newly designed filter can be completed within 1 day, and the continuous use effect of the filter is ensured.
2. The filter cloth filtering effect is optimal, water in the pool can reach a clean effect through filtering of the filter cloth, the filter cloth is polluted due to increase of filtering capacity, the filter cloth needs to be cleaned, the filter cloth is not cleaned for a long time and can be polluted, the filter cloth effect can be reduced even if the filter cloth is cleaned again, proper filtering capacity is guaranteed to be very important, and the opening degree of the stepless adjustment water inlet valve of the system can achieve the effect.
3. The service life of the filter cloth is ensured to be optimal due to proper self-cleaning times, and the filter cloth is damaged due to each cleaning, so that the water inflow is self-adjusted through the system, and the sufficient filtering capacity is met when the filter cloth effect is good; after the filter cloth is depreciated, the water inflow is reduced, and the cleaning at fixed time intervals is ensured, so that the filter cloth reaches the maximum utilization rate.
Drawings
FIG. 1 is a logic diagram of a program for optimizing the use of filter cloth in a filter by adding an inlet valve positioner.
Detailed Description
The invention is further described below with reference to the following figures and examples.
Example 1
As shown in figure 1, the method for optimizing the use of filter cloth by adding the water inlet valve positioner in the filter tank comprises the following steps:
1. a valve positioner with a specification compatible with a water inlet valve (a manual-automatic integrated electric valve) is additionally arranged at the water inlet valve end of the civil engineering vertical filter cloth filter;
2. replacing an analog input module EM AE04 in the electric control cabinet with EM AM03;
3. a group of analog output signal cables are led out from the EM AM03 module and connected to the analog signal input end of the water inlet valve positioner;
4. in the PLC program, a conversion program is designed, and a signal with the valve opening of 0% -100% is converted into a 4-20mA signal to be transmitted to a valve positioner;
5. designing a program, when the automatic mode is started, setting the initial valve opening to be 25% and transmitting the initial valve opening to a valve positioner to ensure that the filter tank starts to work in a state of relatively low treatment capacity;
6. in a PLC program, recording the time from the start of an automatic mode to the first time when the filter tank reaches the high liquid level for triggering cleaning, and then recording the interval time between the front time and the back time when the filter tank reaches the high liquid level for triggering cleaning (back washing), namely, recording the time when the front time and the back time when the filter tank reaches the high liquid level for triggering cleaning (back washing), and then subtracting the time to obtain the interval time between the front time and the back time when the filter tank reaches the high liquid level for triggering cleaning; then, the interval time between the two times of high liquid level reaching before and after triggering cleaning is compared with the optimal cleaning interval time (generally 2 hours), and the opening of the water inlet valve is adjusted according to the preset value: if the opening of the water inlet valve is more than 2 hours, the opening is increased by 5 percent, the smaller the opening is set, the finer the adjustment is, and the situation of repeated adjustment can not occur; on the contrary, if the time is less than 2 hours, the opening degree of the water inlet valve is reduced by 5 percent;
7. in the programming, the allowable opening degree of the water inlet valve is 100 percent at most, and the valve is in a fully opened state at the moment; the minimum allowable opening degree of the water inlet valve is 20%, and at the moment (when the opening degree of the water inlet valve is 20%), if the interval time between the two times of reaching high liquid level and triggering cleaning is still less than 2 hours, the PLC system triggers an alarm to prompt a user that the filter tank is in an abnormal state and filter cloth needs to be replaced or the condition of overlarge water inflow needs to be checked.
Example 2
The invention discloses a method for optimizing filter cloth use of a filter by adding a water inlet valve positioner, which comprises the following steps:
1. a valve positioner with a specification compatible with a water inlet valve (a manual-automatic integrated electric valve) is additionally arranged at the water inlet valve end of the civil engineering vertical filter cloth filter;
2. replacing an analog input module EM AE04 in the electric control cabinet to be EM AM03;
3. a group of analog output signal cables are led out from the EM AM03 module and connected to the analog signal input end of the water inlet valve positioner;
4. in the PLC program, a conversion program is designed, and a signal with the valve opening of 0% -100% is converted into a 4-20mA signal to be transmitted to a valve positioner;
5. designing a program, when the automatic mode is started, setting the initial valve opening to be 30% and transmitting the initial valve opening to a valve positioner to ensure that the filter tank starts to work in a state with relatively low treatment capacity;
6. in a PLC program, recording the time from the start of an automatic mode to the first time when the filter tank reaches the high liquid level for triggering cleaning, and then recording the interval time between the front time and the back time when the filter tank reaches the high liquid level for triggering cleaning, namely recording the time when the front time and the back time reach the high liquid level for triggering cleaning (back washing), and then subtracting the time to obtain the interval time between the front time and the back time when the filter tank reaches the high liquid level for triggering cleaning; then, the interval time between the two times of high liquid level reaching before and after triggering cleaning is compared with the optimal cleaning interval time (generally 2 hours), and the opening of the water inlet valve is adjusted according to the preset value: if the opening of the water inlet valve is more than 2 hours, the opening is increased by 5 percent, the smaller the opening is set, the finer the adjustment is, and the situation of repeated adjustment can not occur; on the contrary, if the time is less than 2 hours, the opening degree of the water inlet valve is reduced by 5 percent;
7. in the programming, the allowable opening degree of the water inlet valve is 100 percent at most, and the valve is in a fully opened state at the moment; the minimum allowable opening degree of the water inlet valve is 20%, and at the moment (when the opening degree of the water inlet valve is 20%), if the interval time between the two times of high liquid level reaching and the two times of high liquid level triggering and cleaning is still less than 2 hours, the PLC system triggers an alarm to prompt a user that the filter tank is in an abnormal state and filter cloth needs to be replaced or the condition of overlarge water inflow needs to be checked.
Example 3
The invention discloses a method for optimizing filter cloth use of a filter by adding a water inlet valve positioner, which comprises the following steps:
1. a valve positioner with a specification compatible with a water inlet valve (a manual-automatic integrated electric valve) is additionally arranged at the water inlet valve end of the civil engineering vertical filter cloth filter;
2. replacing an analog input module EM AE04 in the electric control cabinet with EM AM03;
3. a group of analog output signal cables are led out from the EM AM03 module and connected to the analog signal input end of the water inlet valve positioner;
4. in the PLC program, a conversion program is designed, and a signal with the valve opening of 0% -100% is converted into a 4-20mA signal to be transmitted to a valve positioner;
5. designing a program, setting the initial valve opening to be 35% and transmitting the initial valve opening to a valve positioner when the automatic mode is started, and ensuring that the filter tank starts to work in a state of relatively low treatment capacity;
6. in a PLC program, recording the time from the start of an automatic mode to the first time when the filter tank reaches the high liquid level for triggering cleaning, and then recording the interval time between the front time and the back time when the filter tank reaches the high liquid level for triggering cleaning (back washing), namely, recording the time when the front time and the back time when the filter tank reaches the high liquid level for triggering cleaning (back washing), and then subtracting the time to obtain the interval time between the front time and the back time when the filter tank reaches the high liquid level for triggering cleaning; then, the interval time between the two times of high liquid level reaching before and after triggering cleaning is compared with the optimal cleaning interval time (generally 2 hours), and the opening of the water inlet valve is adjusted according to the preset value: if the opening of the water inlet valve is more than 2 hours, the opening is increased by 2 percent, the smaller the opening is set, the finer the adjustment is, and the situation of repeated adjustment can not occur; on the contrary, if the time is less than 2 hours, the opening degree of the water inlet valve is reduced by 2 percent;
7. in the program design, the maximum allowable opening degree of the water inlet valve is 100%, and the valve is in a fully opened state at the moment; the minimum allowable opening degree of the water inlet valve is 15%, and at the moment (when the opening degree of the water inlet valve is 15%), if the interval time between the two times of high liquid level reaching and cleaning triggering is still less than 2 hours, the PLC system triggers an alarm to prompt a user that the filter tank is in an abnormal state and filter cloth needs to be replaced or the condition of overlarge water inflow needs to be checked.
Claims (6)
1. A method for optimizing filter cloth use of a filter tank by adding a water inlet valve positioner is characterized by comprising the following steps:
1) Additionally arranging a valve positioner with a specification compatible with the water inlet valve at the water inlet valve end of the vertical filter cloth filter;
2) Replacing the analog input module in the electric control cabinet to be EM AM03;
3) A group of analog output signal cables are led out from the EM AM03 module and connected to the analog signal input end of the water inlet valve positioner;
4) In the PLC program, a conversion program is designed, and signals with the valve opening degree of 0% -100% are converted into 4-20mA signals to be transmitted to a valve positioner;
5) Designing a program, when the automatic mode is started, setting the initial valve opening to be 25-35% and transmitting the initial valve opening to a valve positioner to ensure that the filter tank starts to work in a state of relatively low treatment capacity;
6) In the PLC program, recording the time from the start of the automatic mode to the first time when the high liquid level of the filter tank is reached to trigger cleaning; then, recording the interval time of triggering cleaning when the high liquid level is reached twice; then, the interval time of triggering cleaning when the high liquid level is reached twice is compared with the optimal cleaning interval time, and the opening of the water inlet valve is adjusted according to the preset value: if the optimal cleaning interval time is longer than the optimal cleaning interval time, increasing the opening degree of the water inlet valve; on the contrary, if the time is less than the optimal cleaning interval time, the opening degree of the water inlet valve is reduced;
7) In the programming, the maximum allowable opening degree of the water inlet valve is set to be 100%, and the valve is in a fully open state at the moment; setting the minimum allowable opening degree of the water inlet valve to be 20%; designing a program, when the opening of the water inlet valve is 20% of the minimum opening, if the interval time between the two times of reaching high liquid level and triggering cleaning is still less than the optimal cleaning interval time, triggering an alarm by the PLC system, and prompting a user that the filter tank is in an abnormal state and the filter cloth needs to be replaced or the condition of overlarge water inflow needs to be checked.
2. A method of optimizing filter cloth use in a filter chamber according to claim 1 by adding an inlet valve positioner, wherein in step 5) the program is programmed to transmit an initial valve opening setting of preferably 30% to the valve positioner when the automatic mode is activated.
3. The method for optimizing the use of filter cloth in the filter tank according to claim 1 by adding the water inlet valve positioner, wherein in the step 6), if the interval time between the two times of high liquid level triggering cleaning before and after the high liquid level triggering cleaning is longer than the optimal cleaning interval time, the opening degree of the water inlet valve is increased by 2-8%; on the contrary, if the interval time of the two times of reaching the high liquid level to trigger the cleaning is less than the optimal cleaning interval time, the opening degree of the water inlet valve is reduced by 2-8 percent.
4. The method for optimizing the use of filter cloth by adding the water inlet valve positioner in the filter chamber according to claim 3, wherein in the step 6), if the interval time between the two times of triggering cleaning after reaching the high liquid level is longer than the optimal cleaning interval time, the opening degree of the water inlet valve is increased by 5%; on the contrary, if the interval time of the two times of reaching the high liquid level to trigger the cleaning is less than the optimal cleaning interval time, the opening degree of the water inlet valve is reduced by 5 percent.
5. A method for optimizing the use of filter cloth in a filter according to claim 1, 3 or 4 by adding an inlet valve positioner, wherein in step 6) the optimum cleaning interval is 2 hours.
6. A method for optimizing filter cloth use in a filter according to claim 1 by adding a water inlet valve positioner, wherein the water inlet valve is a manual and automatic integrated electric valve.
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| CN104722207A (en) * | 2013-12-24 | 2015-06-24 | 珠海格力电器股份有限公司 | Water purification system and control method thereof, and water purifier |
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