CN107670373A - Changeable operation and the filter and control method of automatic back-washing - Google Patents
Changeable operation and the filter and control method of automatic back-washing Download PDFInfo
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- CN107670373A CN107670373A CN201711154010.0A CN201711154010A CN107670373A CN 107670373 A CN107670373 A CN 107670373A CN 201711154010 A CN201711154010 A CN 201711154010A CN 107670373 A CN107670373 A CN 107670373A
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- 238000011001 backwashing Methods 0.000 title claims abstract description 20
- 238000000034 method Methods 0.000 title claims abstract description 20
- 238000001914 filtration Methods 0.000 claims abstract description 40
- 238000012806 monitoring device Methods 0.000 claims abstract description 15
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 39
- 239000010865 sewage Substances 0.000 claims description 30
- 238000001514 detection method Methods 0.000 claims description 10
- 230000006835 compression Effects 0.000 claims description 5
- 238000007906 compression Methods 0.000 claims description 5
- 239000012530 fluid Substances 0.000 claims description 5
- 238000012544 monitoring process Methods 0.000 claims description 5
- 239000007788 liquid Substances 0.000 claims description 4
- 239000007790 solid phase Substances 0.000 claims description 4
- 239000012535 impurity Substances 0.000 claims description 3
- 230000001960 triggered effect Effects 0.000 claims 1
- 230000000694 effects Effects 0.000 abstract description 7
- 230000008901 benefit Effects 0.000 abstract description 3
- 230000002159 abnormal effect Effects 0.000 description 11
- 230000008569 process Effects 0.000 description 5
- 238000005516 engineering process Methods 0.000 description 4
- 230000008859 change Effects 0.000 description 3
- 230000007423 decrease Effects 0.000 description 2
- 238000012423 maintenance Methods 0.000 description 2
- 238000007726 management method Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 239000012071 phase Substances 0.000 description 2
- 230000000903 blocking effect Effects 0.000 description 1
- 238000004140 cleaning Methods 0.000 description 1
- 238000003745 diagnosis Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 235000013399 edible fruits Nutrition 0.000 description 1
- 239000007789 gas Substances 0.000 description 1
- 239000008235 industrial water Substances 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000004886 process control Methods 0.000 description 1
- 230000004044 response Effects 0.000 description 1
- 238000004092 self-diagnosis Methods 0.000 description 1
- 238000005406 washing Methods 0.000 description 1
- 239000003643 water by type Substances 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D35/00—Filtering devices having features not specifically covered by groups B01D24/00 - B01D33/00, or for applications not specifically covered by groups B01D24/00 - B01D33/00; Auxiliary devices for filtration; Filter housing constructions
- B01D35/12—Devices for taking out of action one or more units of multi- unit filters, e.g. for regeneration
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D35/00—Filtering devices having features not specifically covered by groups B01D24/00 - B01D33/00, or for applications not specifically covered by groups B01D24/00 - B01D33/00; Auxiliary devices for filtration; Filter housing constructions
- B01D35/14—Safety devices specially adapted for filtration; Devices for indicating clogging
- B01D35/143—Filter condition indicators
- B01D35/1435—Filter condition indicators with alarm means
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D35/00—Filtering devices having features not specifically covered by groups B01D24/00 - B01D33/00, or for applications not specifically covered by groups B01D24/00 - B01D33/00; Auxiliary devices for filtration; Filter housing constructions
- B01D35/16—Cleaning-out devices, e.g. for removing the cake from the filter casing or for evacuating the last remnants of liquid
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- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Filtration Of Liquid (AREA)
Abstract
The present invention relates to a kind of changeable operation and the filter and control method of automatic back-washing, for keeping filter to work continuously and carrying out automatic depth backwash.Filter includes filter element, programmable controller, monitoring device, two filter element structures are identical, it is arranged in parallel, differential pressure transmitter is monitored to the filter inlet of filter element and the pressure value of outlet, operation of the pressure value and filtration time that programmable controller is monitored by differential pressure transmitter to two filter elements switches over, ensure that filtering operation can be carried out continuously, filter element out of service carries out backwash by programmable controller controls, ensures the effect of backwash.The present invention solves the problems, such as filter continuously operation and automatic back-washing, while backwash blowdown, can still provide for filter operation, does not influence the normal operation of filter.The present invention has the advantages that compact-sized, smooth running is reliable, treating capacity is big, service life is long, there is fabulous popularizing value.
Description
Technical field
The present invention relates to a kind of filtering dress that can be switched over and keep working continuously and can carrying out automatically depth backwash
Put and control method, belong to filter plant and method and technology field.
Background technology
In the filter that many enterprises use, as filter is during filters, the solid phase in liquid is miscellaneous
Matter is trapped in surface by filter element, progressively deposits, and causes filter element pressure at two ends difference to become big, filtration resistance can further increase
Greatly, so as to causing filter efficiency to decline, it is necessary to carry out maintenance down to recover filtering function.If filter element Severe blockage,
Filter element failure or damage are likely resulted in, production accident or system will be caused out of service, it is therefore necessary to blocking
Filter element is changed.
In general filter need to interrupt filter operation in cleaning, to carry out changing filter element or to take out filtering element
Part cleans, so not only time-consuming but also bothersome, influences treatment effeciency, and can not reach the requirement of worked continuously by automation.It is and current
Filter with automatic back-washing function typically carries out backwash using Single Mediums such as water and gases, and backwash effect is not ideal enough,
Still there is certain solid phase impurity to be attached on screen pack, and filter backwash system detectio and self diagnostic capability are poor, equally
Influence the backwash effect of filter.
In summary, can not be worked continuously when the filter of enterprise has maintenance at present, backwash effect is undesirable and not
The shortcomings that automatically controlling can be realized, with advances in technology with automation, the raising of intelligent level, it is quite necessary to existing
Filter be improved.
The content of the invention
The technical problems to be solved by the invention are to provide a kind of changeable operation and filter and the control of automatic back-washing
Method processed, this filter the filtering situation to filter element can carry out self diagnosis in the process of running, be tied according to diagnosis
Fruit adjusts the method for operation of filter element in time, and switch filtering unit simultaneously carries out depth backwash, can keep filtration system automatically
Continuous operation operation and ensure backwash effect.
The present invention solves the technical scheme that above-mentioned technical problem uses：
A kind of changeable operation and the filter of automatic back-washing, including filter element, programmable controller, monitoring device,
Filter element is two, and two filter element structures are identical, are arranged in parallel, respectively by filter, inlet control valve, control of export
Valve, backwash water control valve, sewage control valve, blowback control valve group are into the entrance of the filter of each filter element passes through threeway
Connect inlet control valve respectively and sewage control valve, inlet control valve are connected by pipeline with medium pipeline to be filtered, sewage
Control valve is connected by pipeline with blow-off line, and connection outlet control valve and backwash water are distinguished in the outlet of filter by threeway
Control valve, discharge control valve are connected by pipeline with filter medium pipeline, and backwash water control valve is supplied water by pipeline with outside
Pipeline is connected, and is also connected on the three-way pipe of backwash water control valve connection by pipeline with blowback control valve, blowback control
Valve is connected by pipeline with external compression air duct, inlet control valve pipeline, the sewage control valve pipe of two filter elements
Road, discharge control valve pipeline, backwash water control valve pipeline, blowback control valve pipeline are respectively connected with leading to, the both ends of differential pressure transmitter
It is connected between the inlet control valve pipeline and discharge control valve pipeline of two filter elements, programmable controller and two
The control valve of individual filter element is connected, and monitoring device is connected with programmable controller.
Described changeable operation and the control method of the filter of automatic back-washing, are carried out according to the following steps：
A. two filter elements i.e. 1# filter elements and the differential pressure transmitter at 2# filter elements both ends are installed on（15）Detection filtering
Device entrance and the pressure difference of outlet, and detection signal is delivered into programmable controller（1）, programmable controller（1）According to
The size of pressure difference determines the working condition of filter element, or programmable controller（1）During according to the operation of filter element
Between filter element is switched over；
B. in normal operation, 1# filter elements are filtered, and 2# filter elements are in stand-by state, the entrance of 1# filter elements
Control valve（4）, discharge control valve（5）Open, inlet control valve of the medium to be filtered from 1# filter elements（4）Flow into, pass through 1#
The filter of filter element（3）Filtering, then the discharge control valve from 1# filter elements（5）Outflow, into filter medium pipeline；
C. with the progress of filtering, the solid phase impurity in liquid is by the filter of 1# filter elements（3）Filter element be trapped in
Surface, progressively deposit, cause the pressure difference increase of filter element both ends, after pressure difference reaches switching pressure set points, or 1#
After filter element reaches the run time of setting, programmable controller（1）Open the inlet control valve of 2# filter elements（10）
With the discharge control valve of 2# filter elements（11）, start 2# filter elements and carry out filtration operation, after starting 3 seconds, close 1# mistakes
Filter the inlet control valve of unit（4）With the discharge control valve of 1# filter elements（5）, stop the operation of 1# filter elements；
D.1# filter element opens the backwash water control valve of 1# filter elements after 30 seconds out of service（6）With 1# filter elements
Sewage control valve（7）, the blowback control valve of opening 1# filter elements after 10 seconds（8）, start the backwash of 1# filter elements, by setting
The backwash of definite value time, close the backwash water control valve of 1# filter elements（6）, sewage control valve（7）With blowback control valve（8）,
Complete the backwash of 1# filter elements and be allowed to be in stand-by state；
E. as the filtering of 2# filter elements continues, when the pressure difference of differential pressure transmitter reaches switching pressure set points again
Afterwards, or after 2# filter elements reach the run time of setting, programmable controller（1）Open the entrance control of 1# filter elements
Valve processed（4）And discharge control valve（5）, start 1# filter elements, after starting 3 seconds, close the inlet control valve of 2# filter elements
（10）And discharge control valve（11）, stop the operation of 2# filter elements；
F. after 2# filter elements stop 30 seconds, the backwash water control valve of 2# filter elements is opened（12）With sewage control valve
（13）, the blowback control valve of opening 2# filter elements after 10 seconds（14）, start the backwash of 2# filter elements, set by the backwash time
The backwash at definite value interval, close the backwash water control valve of 2# filter elements（12）, sewage control valve（3）With blowback control valve
（14）, complete the backwash of 2# filter elements and be allowed to be in stand-by state.
Using the present invention of above-mentioned technical proposal, compared with prior art, its advantage is：
Using two filter elements arranged side by side, differential pressure transmitter is carried out to the filter inlet of filter element and the pressure value of outlet
Monitoring, the pressure value or the run time of setting that programmable controller is monitored by differential pressure transmitter are to two filter elements
Operation switch over, ensure filtering operation can be carried out continuously, filter element out of service is by programmable controller control
System carries out backwash, ensures the effect of backwash.
Automatic control technology is applied in filtration system by the present invention, perfect filtration system function, solves well
The problem of continuous operation of filter and automatic back-washing, what blowdown process was carried out automatically in equipment running process, arranged in backwash
While dirty, filter operation is can still provide for, does not influence the normal operation of filter.The present invention, which has, continuously to be filtered, is automatic anti-
Wash blowdown, the advantages that compact-sized, smooth running is reliable, treating capacity is big, operating cost is low, service life is long, be existing filtering
The upgraded product of device, there is fabulous popularizing value.
Preferably, the further technical scheme of the present invention is：
The hydraulic pressure control in the external fluid delivery conduit road of the backwash water control valve connection is between 0.4~0.5 MPa；The blowback control
The air-pressure controlling of the external compression air duct of valve connection processed is between 0.55~0.65 MPa.
The 1# filter elements are alternately and repeatedly run with 2# filter elements, programmable controller（1）The each filtering of record
The number of backwashes and run time of unit, if the time of wherein some filter element operation is excessively short, and number of backwashes increases,
Control system sends the warning message of corresponding some filter element, prompts to need to carry out overhaul plan.
In filter element operation, if the filter element both ends pressure difference of filter is suddenly smaller from larger value changes
Value, the plugged filter with regard to that can be considered the filter element trigger filter element backwash function at once, and control system sends described
The warning message of filter element, prompt to need to carry out overhaul plan.
The programmable controller（1）According to differential pressure transmitter（15）The filter inlet of detection and the pressure difference of outlet
The operation of described two filter elements is switched over, the pressure default value is 0.7 kPa, when the operating side pressure of filter element two
After difference reaches the switching pressure value of setting, spare filtering cell puts into operation, and the operating filter element is out of service,
Backwash state is transformed into, waits backwash.
The programmable controller（1）Two filter element operations are carried out according to the filter element run time of setting
Switching, the time is defaulted as 2 hours, standby after operating filter element run time has reached the switching time of setting
Put into operation with filter element, the operating filter element is out of service, is transformed into backwash state, waits backwash.
The programmable controller（1）According to the backwash run time of the backwash time control filter element of setting, institute
State backwash run time to be defaulted as 60 seconds, setting value have to be larger than equal to default value.
Brief description of the drawings
Fig. 1 is the filter apparatus configuration schematic diagram of the embodiment of the present invention；
Fig. 2 is filter process control flow chart；
Marked in figure as follows：Programmable controller 1；Monitoring device 2；1# filters 3；1# inlet control valves 4；1# controls of export
Valve 5；1# backwashes water control valve 6；1# sewage controls valve 7；1# blowbacks control valve 8；2# filters 9；2# inlet control valves 10；2# goes out
Mouth control valve 11；2# backwashes water control valve 12；2# sewage controls valve 13；2# blowbacks control valve 14；Differential pressure transmitter 15；It is to be filtered
Medium 16；Filter medium 17；Industry water 18；Compressed air 19；Sewer 20.
Embodiment
The present invention is described in detail below in conjunction with drawings and Examples.
The changeable operation and the filter of automatic back-washing that the present embodiment provides, are arranged in parallel using two identical structures
Filter element, differential pressure transmitter is monitored to the pressure value of the filter inlet of filter element and outlet, programmable control
Operation of the pressure value or the run time of setting that device processed is monitored by differential pressure transmitter to two filter elements switches over,
Ensure the continuity of filtering operation, filter element out of service carries out backwash by programmable controller controls, ensures backwash
Effect.
Fig. 1 shows that 1# filter elements are by 1# filters 3,1# inlet control valves 4,1# discharge control valves 5,1# backwash water controls
Valve 6 processed, 1# sewage controls valve 7,1# blowbacks control valve 8 form.2# filter elements are by 2# filters 9,2# inlet control valves 10,2#
Discharge control valve 11,2# backwashes water control valve 12,2# sewage controls valve 13,2# blowbacks control valve 14 form.
1# filters 3 and 2# filters 9 are two vertical elongated cylindrical filters, built-in screen pack, and parallel Vertical is parallel
Arrangement, lower mouth be filter entrance, the outlet suitable for reading for filter.
It is the structure of 1# filter elements below, 2# filter elements structure is identical with 1# filter element structures.
Fig. 1 shows that the entrance of 1# filters 3 connects 1# inlet control valves 4 and 1# sewage controls valve 7 by threeway respectively,
1# inlet control valves 4 are connected by pipeline with medium pipeline to be filtered, and 1# sewage controls valve 7 passes through pipeline and blow-off line phase
Connection.For controlling liquid to be filtered is positive to flow into 1# filters 3, and the sewage of 1# filters 3 is discharged.
Fig. 1 shows that the outlet of 1# filters 3 is connected by threeway with 1# discharge control valves 5, and 1# discharge control valves 5 are logical
Cross pipeline with filter medium pipeline to be connected, for controlling filtered fluid to flow out.1# filters 3 pass through the another of threeway simultaneously
Individual outlet is connected with 1# backwashes water control valve 6, and 1# backwashes water control valve 6 is connected by pipeline with external fluid delivery conduit road, uses
1# filters 3 are reversely flowed into control backwash water, backwash is carried out to 1# filters 3.In the threeway that 1# backwashes water control valve 6 connects
Also it is connected on pipe by pipeline with 1# blowbacks control valve 8,1# blowbacks control valve 8 passes through pipeline and external compression air duct phase
Connection, for inputting the compressed air of backwash to 1# filters 3.
Outer net water supply line uses continuous water supply mode, is free from admixture industrial water, hydraulic pressure control is at 0.4~0.5 MPa
Between.Outer net compressed air piping uses continuous plenum system, and for the pure compressed air by filtering, Stress control is 0.55
Between~0.65 MPa.
Fig. 1 shows that the inlet control valve pipeline of 1# filter elements and 2# filter elements, sewage control valve pipeline, outlet are controlled
Valve pipeline processed, backwash water control valve pipeline, blowback control valve pipeline are respectively connected with leading to, and the both ends of differential pressure transmitter 15 connect respectively
Between 1# filter elements and the inlet control valve pipeline and discharge control valve pipeline of 2# filter elements, for monitoring two in operation
Differential pressure between filter inlet and outlet.Important detection unit of the differential pressure transmitter 15 as filter, it is desirable to have
Higher accuracy of detection, while also there is higher response speed.
Fig. 1 shows that each control valve of the programmable controller 1 respectively with 1# filter elements and 2# filter elements is connected
Connect, monitoring device 2 is connected with programmable controller 1.
The control function of monitoring device 2 includes hand/automatic mode, manual switching, the reset of each filter element；Control parameter
Include switching pressure, switching time, backwash time, be able to can also be used according to these parameters of running situation manual modification
System default value；It is anti-that monitoring function includes each control valve state of a control, each control valve position state, pressure difference, each filter element
Wash number, each filter element run time, system alarm.
The filter backwash of the present invention has manually and automatically two kinds of operational modes.
Manual mode：By monitoring interface manual switching filter element and backwash can be carried out, can not entered when backwash is carried out
The switching of row filter element.
Automatic mode：Switching pressure, switching time and backwash time can be set by monitoring device 2, switch pressure is
System is defaulted as 0.7 kPa, and the system default value of switching time is 2 hours, and the system default value of backwash time is 60 seconds, if not
Progress artificially sets these setting values manually, then system takes default value.
System starts：System enabling signal starts backward filter from the main system residing for filter, main system
Send enabling signal.
System stops：System stop signal stops backward filter from the main system residing for filter, main system
Send stop signal.
Single cycle control flow is as follows in automatic mode by one of the present invention：
Step 1：After the main system residing for filter starts, filter receives the enabling signal of main system, filtering dress
Put comprehensive startup.
Step 2：1# filter elements put into operation, and 2# filter elements are in stand-by state, 1# inlet control valves 4 and 1# outlets
Control valve 5 is opened, remaining control valve Close All.
Step 3：Monitoring device 2 detects whether 1# inlet control valves 4 and 1# discharge control valves 5 are open mode, remaining control
Whether valve processed is closed mode；The switch filtering unit if 1# inlet control valves 4 and the abnormal state of 1# discharge control valves 5, holds
Row step 5 is simultaneously alarmed.
Step 4：Filter process is continuously run, and differential pressure transmitter 15 detects the pressure difference at the both ends of 1# filters 3, judges 1# mistakes
Filter the filtering conditions of unit.
Step 5：When the pressure difference at the both ends of 1# filters 3 exceedes switching pressure set points, programmable controller 1 starts
The backwash function of 1# filter elements, now put into operation 2# filter elements first, opens 2# inlet control valves 10 and 2# outlets control
Valve 11 processed.
Step 6：Monitoring device 2 detects whether 2# inlet control valves 10 and 2# discharge control valves 11 are open mode；If
Then switch filtering unit, execution step 14 are simultaneously alarmed for 2# inlet control valves 10 and the abnormal state of 2# discharge control valves 11；If
There is exception in 1# inlet control valves 4 and 1# discharge control valves 5 in step 3, now 2# inlet control valves 10 and 2# controls of export
There is exception again in valve 11, then stops filtering and alarming.
Step 7：After 2# filter elements put into operation 3 seconds, 1# filter elements are cut out, 1# inlet control valves 4 is closed and 1# goes out
Mouth control valve 5.The running situation of 2# filter elements is detected, if the pressure difference at the both ends of 2# filters 9 exceedes switching pressure in 30 seconds
Power setting value, again switchback 1# filter elements, the alarm of 2# filter elements are overhauled.
Step 8：Detect whether 1# inlet control valves 4 and 1# discharge control valves 5 are closed mode, stop if abnormal state
Only backwash and alarm.
Step 9：After 30 seconds, 2# filter element normal operations, 1# filter elements start backwash, are first turned on 1# backwash water controls
Valve 6 processed, 1# sewage controls valve 7, enter water-filling backwash.
Step 10：After 10 seconds, then 1# blowbacks control valve 8 is opened, enter water-filling and compressed air mixing backwash.
Step 11：Detect whether 1# backwashes water control valve 6,1# sewage controls valve 7,1# blowbacks control valve 8 are open mode,
Stop backwash if abnormal state and alarm.
Step 12：After 1# filter element backwash run times reach backwash time setting value, 1# backwash water managements are closed
Valve 6,1# sewage controls valve 7,1# blowbacks control valve 8,1# filter elements terminate backwash and enter stand-by state.
Step 13：Whether detection remaining control valve in addition to 2# inlet control valves 10,2# discharge control valves 11 is closed mode,
Alarm is sent if abnormal state.
Step 14：When the pressure difference at the both ends of 2# filters 9 exceedes switching pressure set points, programmable controller 1 opens
The backwash function of dynamic 2# filter elements, now put into operation 1# filter elements first, opens 1# inlet control valves 4 and 1# outlets control
Valve 5 processed.
Step 15：Monitoring device 2 detects whether 1# inlet control valves 4 and 1# discharge control valves 5 are open mode, if 1#
Then switch filtering unit, execution step 5 are simultaneously alarmed for inlet control valve 4 and the abnormal state of 1# discharge control valves 5；If in step 6
There is exception in 2# inlet control valves 10,2# discharge control valves 11, and now 1# inlet control valves 4 and 1# discharge control valves 5 occur again
It is abnormal, then stop filtration system and alarm.
Step 16：After 1# filter elements put into operation 3 seconds, 2# filter elements are cut out, close 2# inlet control valves 10,2# goes out
Mouth control valve 11, the running situation of 1# filter elements is detected, if the differential pressure value at the both ends of 1# filters 3 exceedes switching pressure in 30 seconds
Power setting value, again switchback 2# filter elements, the alarm of 1# filter elements are overhauled.
Step 17：Whether detection 2# inlet control valves 10,2# discharge control valves 11 are closed mode, if abnormal state
Stop backwash and alarm.
Step 18：After 30 seconds, 1# filter element normal operations, 2# filter elements start backwash, are first turned on 2# backwash waters
Control valve 12,2# sewage controls valve 13, enter water-filling backwash.
Step 19：After 10 seconds, then 2# blowbacks control valve 14 is opened, enter water-filling and compressed air mixing backwash.
Step 20：Monitoring device 2 detects 2# backwashes water control valve 12,2# sewage controls valve 13,2# blowbacks control valve 14
No is open mode, stops backwash if abnormal state and alarms.
Step 21：After 2# filter element backwash run times reach backwash time setting value, 2# backwash water managements are closed
Valve 12,2# sewage controls valve 13,2# blowbacks control valve 14,2# filter elements terminate backwash and enter stand-by state.
Step 22：Monitoring device 2 detects whether 1# inlet control valves 4 and 1# discharge control valves 5 are open mode, remaining control
Whether valve processed is closed mode；The switch filtering unit if 1# inlet control valves 4 and the abnormal state of 1# discharge control valves 5, holds
Row step 5 is simultaneously alarmed.
Continuously run by above-mentioned automatic mode control flow, two sets of filter elements are a set of to run a set of standby, programmable
Controller 1 detects the filtering situation of two filters according to 1# filters 3 or the both ends pressure difference of 2# filters 9, more than setting value
The running status of adjustment filter element, spare filtering cell put into operation in time afterwards, block filter element and carry out automatic back-washing, instead
Stand-by state is in after washing end, it is ensured that the continuous operation of system.
In automatic mode, if programmable controller 1 controls some control valve to open or close, its valve position signal does not have
Have and correct positional information is sent to programmable controller 1, or certain filter element, in operation or backwash process, filtering is single
Certain control valve in member will not required to produce alarm signal by control requirement change, programmable controller 1 according to logic control
Breath is sent to monitoring device 2.
In automatic mode, if certain filter element is in running status, the pressure difference that differential pressure transmitter 15 detects
Within setting value, but at a time pressure difference has significantly decline suddenly, it can be determined that this filter element occurs different
Chang Xianxiang, needs cut-in stand-by filter element, and programmable controller 1 sends warning message, abnormal filter element to monitoring device 2
Automatic back-washing is carried out, backwash waits Awaiting Overhaul to change Inner filter net after terminating.
In automatic mode, two filter elements are alternately and repeatedly run, and programmable controller 1 records each filter element
Number of backwashes and run time, if the time of some filter element operation is excessively short and number of backwashes increases, control system
The warning message of corresponding filter element is sent, prompts to need to carry out overhaul plan.
The above described is only a preferred embodiment of the present invention, any type of limitation is not done to the present invention, it is any
Without departing from the content of technical solution of the present invention, the technical spirit according to the present invention any is simply repaiied to made for any of the above embodiments
Change, equivalent variations and modification, belong to the scope of technical solution of the present invention.
Claims (8)
1. a kind of changeable operation and the filter of automatic back-washing, including filter element, programmable controller（1）, monitoring
Equipment（2）, it is characterised in that：Filter element be two, two filter element structures are identical, are arranged in parallel, respectively by filter,
Inlet control valve, discharge control valve, backwash water control valve, sewage control valve, blowback control valve group are into the mistake of each filter element
The entrance of filter connects inlet control valve and sewage control valve by threeway respectively, and inlet control valve passes through pipeline and Jie to be filtered
Matter pipeline is connected, and sewage control valve is connected by pipeline with blow-off line, and the outlet of filter is connected respectively by threeway
Discharge control valve and backwash water control valve, discharge control valve are connected by pipeline with filter medium pipeline, backwash water control valve
It is connected by pipeline with external fluid delivery conduit road, is also controlled on the three-way pipe of backwash water control valve connection by pipeline and blowback
Valve is connected, and blowback control valve is connected by pipeline with external compression air duct, the inlet control valve of two filter elements
Pipeline, sewage control valve pipeline, discharge control valve pipeline, backwash water control valve pipeline, blowback control valve pipeline are respectively connected with leading to,
Differential pressure transmitter（15）Both ends be connected to two filter elements inlet control valve pipeline and discharge control valve pipeline it
Between, programmable controller（1）It is connected with the control valve of two filter elements, monitoring device（2）With programmable controller
（1）It is connected.
2. a kind of control method of the filter of changeable operation as claimed in claim 1 and automatic back-washing, its feature exist
In：Carry out according to the following steps：
A. two filter elements i.e. 1# filter elements and the differential pressure transmitter at 2# filter elements both ends are installed on（15）Detection filtering
Device entrance and the pressure difference of outlet, and detection signal is delivered into programmable controller（1）, programmable controller（1）According to
The size of pressure difference determines the working condition of filter element, or programmable controller（1）During according to the operation of filter element
Between filter element is switched over；
B. in normal operation, 1# filter elements are filtered, and 2# filter elements are in stand-by state, the entrance of 1# filter elements
Control valve（4）, discharge control valve（5）Open, inlet control valve of the medium to be filtered from 1# filter elements（4）Flow into, pass through 1#
The filter of filter element（3）Filtering, then the discharge control valve from 1# filter elements（5）Outflow, into filter medium pipeline；
C. with the progress of filtering, the solid phase impurity in liquid is by the filter of 1# filter elements（3）Filter element be trapped in
Surface, progressively deposit, cause the pressure difference increase of filter element both ends, after pressure difference reaches switching pressure set points, or 1#
After filter element reaches the run time of setting, programmable controller（1）Open the inlet control valve of 2# filter elements（10）
With the discharge control valve of 2# filter elements（11）, start 2# filter elements and carry out filtration operation, after starting 3 seconds, close 1# mistakes
Filter the inlet control valve of unit（4）With the discharge control valve of 1# filter elements（5）, stop the operation of 1# filter elements；
D.1# filter element opens the backwash water control valve of 1# filter elements after 30 seconds out of service（6）With 1# filter elements
Sewage control valve（7）, the blowback control valve of opening 1# filter elements after 10 seconds（8）, start the backwash of 1# filter elements, by setting
The backwash of definite value time, close the backwash water control valve of 1# filter elements（6）, sewage control valve（7）With blowback control valve（8）,
Complete the backwash of 1# filter elements and be allowed to be in stand-by state；
E. as the filtering of 2# filter elements continues, when the pressure difference of differential pressure transmitter reaches switching pressure set points again
Afterwards, or after 2# filter elements reach the run time of setting, programmable controller（1）Open the entrance control of 1# filter elements
Valve processed（4）And discharge control valve（5）, start 1# filter elements, after starting 3 seconds, close the inlet control valve of 2# filter elements
（10）And discharge control valve（11）, stop the operation of 2# filter elements；
F. after 2# filter elements stop 30 seconds, the backwash water control valve of 2# filter elements is opened（12）With sewage control valve
（13）, the blowback control valve of opening 2# filter elements after 10 seconds（14）, start the backwash of 2# filter elements, set by the backwash time
The backwash at definite value interval, close the backwash water control valve of 2# filter elements（12）, sewage control valve（3）With blowback control valve
（14）, complete the backwash of 2# filter elements and be allowed to be in stand-by state.
3. the control method of the filter of changeable operation and automatic back-washing according to claim 2, it is characterised in that：Institute
State backwash water control valve（6）、（12）The hydraulic pressure control in the external fluid delivery conduit road of connection is between 0.4~0.5 MPa；The blowback
Control valve（8）、（14）The air-pressure controlling of the external compression air duct of connection is between 0.55~0.65 MPa.
4. the control method of the filter of changeable operation and automatic back-washing according to claim 2, it is characterised in that：Institute
State 1# filter elements alternately and repeatedly to run with 2# filter elements, programmable controller（1）Record the backwash of each filter element
Number and run time, if the time of wherein some filter element operation is excessively short, and number of backwashes increases, control system hair
Go out the warning message of corresponding some filter element, prompt to need to carry out overhaul plan.
5. the control method of the filter of changeable operation and automatic back-washing according to claim 2, it is characterised in that：
In filter element operation, if the filter element both ends pressure difference of filter is suddenly smaller value from larger value changes, with regard to that can recognize
To be the plugged filter of the filter element, filter element backwash function is triggered at once, and control system sends the filter element
Warning message, prompt need carry out overhaul plan.
6. the control method of the filter of changeable operation and automatic back-washing according to claim 2, it is characterised in that：Institute
State programmable controller（1）According to differential pressure transmitter（15）The filter inlet of detection with export pressure difference to described two
Filter element operation switches over, and the pressure default value is 0.7 kPa, and when operating filter element both ends, pressure difference, which reaches, sets
After fixed switching pressure value, spare filtering cell puts into operation, and the operating filter element is out of service, is transformed into backwash
State, wait backwash.
7. the control method of the filter of changeable operation and automatic back-washing according to claim 2, it is characterised in that：Institute
State programmable controller（1）The operation of two filter elements is switched over according to the filter element run time of setting, this when
Between be defaulted as 2 hours, after operating filter element run time has reached the switching time of setting, spare filtering cell
Put into operation, the operating filter element is out of service, is transformed into backwash state, waits backwash.
8. the control method of the filter of changeable operation and automatic back-washing according to claim 2, it is characterised in that：Institute
State programmable controller（1）According to the backwash run time of the backwash time control filter element of setting, the backwash operation
Time is defaulted as 60 seconds, and setting value have to be larger than equal to default value.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711154010.0A CN107670373A (en) | 2017-11-20 | 2017-11-20 | Changeable operation and the filter and control method of automatic back-washing |
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| CN201711154010.0A CN107670373A (en) | 2017-11-20 | 2017-11-20 | Changeable operation and the filter and control method of automatic back-washing |
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| CN107670373A true CN107670373A (en) | 2018-02-09 |
Family
ID=61148989
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| CN201711154010.0A Pending CN107670373A (en) | 2017-11-20 | 2017-11-20 | Changeable operation and the filter and control method of automatic back-washing |
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| CN111392903A (en) * | 2020-03-25 | 2020-07-10 | 中国建筑设计研究院有限公司 | Distributed swimming pool water treatment system |
| CN111450705A (en) * | 2020-05-11 | 2020-07-28 | 江门市崖门新财富环保工业有限公司 | Immersed membrane module ultrafiltration filter device |
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