CN114534497A - Automatic ultrafiltration control system - Google Patents
Automatic ultrafiltration control system Download PDFInfo
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- CN114534497A CN114534497A CN202210182381.4A CN202210182381A CN114534497A CN 114534497 A CN114534497 A CN 114534497A CN 202210182381 A CN202210182381 A CN 202210182381A CN 114534497 A CN114534497 A CN 114534497A
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- ultrafiltration
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- 238000000108 ultra-filtration Methods 0.000 title claims abstract description 445
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 281
- 239000012528 membrane Substances 0.000 claims abstract description 81
- 238000011001 backwashing Methods 0.000 claims abstract description 70
- 238000004519 manufacturing process Methods 0.000 claims abstract description 50
- 238000001514 detection method Methods 0.000 claims abstract description 38
- 238000011084 recovery Methods 0.000 claims description 23
- 239000003513 alkali Substances 0.000 claims description 17
- SUKJFIGYRHOWBL-UHFFFAOYSA-N sodium hypochlorite Chemical compound [Na+].Cl[O-] SUKJFIGYRHOWBL-UHFFFAOYSA-N 0.000 claims description 16
- 238000007405 data analysis Methods 0.000 claims description 14
- 239000002253 acid Substances 0.000 claims description 13
- 239000005708 Sodium hypochlorite Substances 0.000 claims description 11
- 238000004140 cleaning Methods 0.000 claims description 5
- 238000000034 method Methods 0.000 description 26
- 238000005406 washing Methods 0.000 description 16
- 230000001276 controlling effect Effects 0.000 description 10
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 description 6
- 238000011010 flushing procedure Methods 0.000 description 6
- 238000005201 scrubbing Methods 0.000 description 5
- 239000000126 substance Substances 0.000 description 5
- 239000007788 liquid Substances 0.000 description 3
- 238000010586 diagram Methods 0.000 description 2
- 239000003814 drug Substances 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 238000002791 soaking Methods 0.000 description 2
- 238000012351 Integrated analysis Methods 0.000 description 1
- 230000002159 abnormal effect Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000003745 diagnosis Methods 0.000 description 1
- 239000003657 drainage water Substances 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
- 238000005728 strengthening Methods 0.000 description 1
- 230000007306 turnover Effects 0.000 description 1
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D61/00—Processes of separation using semi-permeable membranes, e.g. dialysis, osmosis or ultrafiltration; Apparatus, accessories or auxiliary operations specially adapted therefor
- B01D61/14—Ultrafiltration; Microfiltration
- B01D61/22—Controlling or regulating
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D61/00—Processes of separation using semi-permeable membranes, e.g. dialysis, osmosis or ultrafiltration; Apparatus, accessories or auxiliary operations specially adapted therefor
- B01D61/14—Ultrafiltration; Microfiltration
- B01D61/18—Apparatus therefor
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D65/00—Accessories or auxiliary operations, in general, for separation processes or apparatus using semi-permeable membranes
- B01D65/02—Membrane cleaning or sterilisation ; Membrane regeneration
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D65/00—Accessories or auxiliary operations, in general, for separation processes or apparatus using semi-permeable membranes
- B01D65/10—Testing of membranes or membrane apparatus; Detecting or repairing leaks
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/44—Treatment of water, waste water, or sewage by dialysis, osmosis or reverse osmosis
- C02F1/444—Treatment of water, waste water, or sewage by dialysis, osmosis or reverse osmosis by ultrafiltration or microfiltration
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2303/00—Specific treatment goals
- C02F2303/14—Maintenance of water treatment installations
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2303/00—Specific treatment goals
- C02F2303/16—Regeneration of sorbents, filters
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Water Supply & Treatment (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Life Sciences & Earth Sciences (AREA)
- Hydrology & Water Resources (AREA)
- Environmental & Geological Engineering (AREA)
- Organic Chemistry (AREA)
- Separation Using Semi-Permeable Membranes (AREA)
Abstract
The invention discloses an ultrafiltration automatic control system, which comprises an ultrafiltration backwashing water pump, an ultrafiltration water inlet valve, a dosing device, an ultrafiltration backwashing water inlet pressure transmitter, an ultrafiltration water production online turbidimeter, an ultrafiltration water production valve, an ultrafiltration water production flow transmitter, an ultrafiltration water production pipeline, an ultrafiltration upper drain valve, a clean water pump, an ultrafiltration water inlet flow transmitter, an ultrafiltration water inlet online turbidimeter, an ultrafiltration water inlet pressure transmitter, an ultrafiltration lower drain valve, a compressed air pipeline, an ultrafiltration air inlet pressure reducing valve, an ultrafiltration backwashing air inlet pressure transmitter, an ultrafiltration air inlet valve, an ultrafiltration membrane wire automatic detection unit, an ultrafiltration drainage online pH meter, an ultrafiltration drainage online turbidimeter and an ultrafiltration water inlet and outlet differential pressure transmitter.
Description
Technical Field
The invention belongs to the technical field of water treatment, and relates to an automatic ultrafiltration control system.
Background
With the development of industrial technology, membrane technology is widely applied in the water treatment industry, ultrafiltration equipment is widely applied to water treatment systems due to the advantages of low system energy consumption, short production period, simple and convenient operation and the like, but many ultrafiltration systems have different automatic control levels at present, the running process, backwashing process and shutdown process of the ultrafiltration systems often need manual intervention, the running state or running end point of the ultrafiltration systems is usually judged by experience, a large amount of manpower and material resources are consumed, or the running period is too long, so that the quality of effluent water of the ultrafiltration systems is deteriorated and is not found in time, and the reliable and stable running of subsequent equipment is influenced.
Disclosure of Invention
The object of the present invention is to overcome the drawbacks of the prior art mentioned above and to provide an automatic ultrafiltration control system which enables control of ultrafiltration.
In order to achieve the aim, the ultrafiltration automatic control system comprises an ultrafiltration backwashing water pump, an ultrafiltration water inlet valve, a dosing device, an ultrafiltration backwashing water inlet pressure transmitter, an ultrafiltration water production online turbidity meter, an ultrafiltration water production valve, an ultrafiltration water production flow transmitter, an ultrafiltration water production pipeline, an ultrafiltration upper drain valve, a clean water pump, an ultrafiltration water inlet flow transmitter, an ultrafiltration water inlet online turbidity meter, an ultrafiltration water inlet pressure transmitter, an ultrafiltration lower drain valve, a compressed air pipeline, an ultrafiltration air inlet pressure reducing valve, an ultrafiltration backwashing air inlet pressure transmitter, an ultrafiltration air inlet valve, an ultrafiltration membrane wire automatic detection unit, an ultrafiltration drainage online pH meter, an ultrafiltration drainage online turbidity meter and an ultrafiltration inlet and outlet water differential pressure transmitter;
the outlet of the ultrafiltration backwashing water pump and the outlet of the dosing device are connected in parallel through a pipeline and then are divided into two paths by an ultrafiltration backwashing water inlet pressure transmitter, wherein one path is communicated with the ultrafiltration water outlet pipeline through an ultrafiltration water production pressure transmitter, an ultrafiltration water production online turbidimeter, an ultrafiltration water production valve and an ultrafiltration water production flow transmitter, the other path is communicated with the top inlet of each ultrafiltration membrane component unit, the upper water outlet of each ultrafiltration membrane component unit is communicated with the inlet of an ultrafiltration upper water discharge valve, the outlet of the clear water pump is divided into two paths sequentially through an ultrafiltration water inlet flow transmitter, an ultrafiltration water inlet online turbidimeter, an ultrafiltration water inlet valve and an ultrafiltration water inlet pressure transmitter, one path is communicated with the lower water outlet of each ultrafiltration membrane component unit, and the other path is communicated with the inlet of an ultrafiltration lower water discharge valve;
the outlet of the compressed air pipeline is divided into two paths, wherein one path is communicated with the lower water outlet of each ultrafiltration membrane component unit through an ultrafiltration air inlet pressure reducing valve, an ultrafiltration backwashing air inlet pressure transmitter and an ultrafiltration air inlet valve, the other path is communicated with an ultrafiltration membrane wire automatic detection unit, the ultrafiltration membrane wire automatic detection unit is communicated with the lower water outlet of each ultrafiltration membrane component unit, the outlet of an ultrafiltration lower water discharge valve and the outlet of an ultrafiltration upper water discharge valve are communicated with an ultrafiltration drainage online turbidity meter through an ultrafiltration drainage online pH meter after being connected in parallel through a pipeline;
the ultrafiltration water inlet and outlet differential pressure transmitter is communicated with the outlet of the ultrafiltration water inlet valve and the inlet of the ultrafiltration water production pressure transmitter.
The medicine adding device comprises an acid adding device, an alkali adding device and a sodium hypochlorite adding device.
The outlet of the ultrafiltration backwashing water pump, the outlet of the acid adding device, the outlet of the alkali adding device and the outlet of the sodium hypochlorite adding device are connected in parallel by pipelines and then divided into two paths according to an online pH meter of ultrafiltration backwashing inlet water, an ultrafiltration backwashing inlet valve and an ultrafiltration backwashing inlet water pressure transmitter.
The outlet of the clean water pump is divided into two paths after passing through an ultrafiltration water inlet flow transmitter, a self-cleaning filter, an ultrafiltration water inlet on-line turbidimeter, an ultrafiltration water inlet valve and an ultrafiltration water inlet pressure transmitter in sequence.
The outlet of the ultrafiltration lower part drain valve and the outlet of the ultrafiltration upper part drain valve are communicated with the inlet of the recovery water valve and the discharge valve through an ultrafiltration drainage online pH meter and an ultrafiltration drainage online turbidity meter in sequence after being connected in parallel through a pipeline, and the outlet of the recovery water valve is communicated with the recovery water tank.
The ultrafiltration membrane component units are divided into two groups, wherein one group is a main ultrafiltration membrane component unit, and the other group is a spare ultrafiltration membrane component unit.
The device also comprises a data analysis and control unit; the input end of the data analysis and control unit is connected with the ultrafiltration inlet water flow transmitter, the ultrafiltration inlet water online turbidity meter, the ultrafiltration inlet water pressure transmitter, the ultrafiltration inlet and outlet water differential pressure transmitter, the ultrafiltration product water online turbidity meter, the ultrafiltration product water flow transmitter, the ultrafiltration drainage online pH meter and the ultrafiltration drainage online turbidity meter;
the output end of the data analysis and control unit is connected with the control ends of an ultrafiltration backwashing water pump, an ultrafiltration backwashing water inlet valve, an ultrafiltration water production valve, an ultrafiltration upper drain valve, an ultrafiltration lower drain valve, a clear water pump, an ultrafiltration water inlet valve, an ultrafiltration air inlet valve, an ultrafiltration membrane yarn detection device air inlet valve, a water recovery valve, a discharge valve, an acid adding device, an alkali adding device and a sodium hypochlorite adding device.
The compressed air pipeline is communicated with the ultrafiltration membrane wire automatic detection unit through an air inlet pressure reducing valve of the ultrafiltration membrane wire detection device, an air inlet valve of a pressure transmitter of the ultrafiltration membrane wire detection device and an air inlet valve of the ultrafiltration membrane wire detection device.
The invention has the following beneficial effects:
when the ultrafiltration automatic control system is operated specifically, the operation, the shutdown, the backwashing and the membrane yarn detection of the ultrafiltration membrane component unit are controlled according to the data obtained by the detection of each detection instrument, so that the full-state process of the ultrafiltration membrane component unit is automatically and accurately controlled in real time.
Drawings
FIG. 1 is a schematic structural diagram of the present invention.
Wherein, 1 is a data analysis and control unit, 2 is a clean water pump, 3 is an ultrafiltration inlet water flow transmitter, 4 is a self-cleaning filter, 5 is an ultrafiltration inlet water online turbidity meter, 6 is an ultrafiltration inlet water valve, 7 is an ultrafiltration inlet water pressure transmitter, 8 is an ultrafiltration backwash water pump, 9 is an ultrafiltration backwash inlet water online pH meter, 10 is an ultrafiltration inlet and outlet water differential pressure transmitter, 11 is an ultrafiltration backwash inlet water valve, 12 is an ultrafiltration backwash inlet water pressure transmitter, 13 is an ultrafiltration product water pressure transmitter, 14 is an ultrafiltration product water online turbidity meter, 15 is an ultrafiltration product water valve, 16 is an ultrafiltration product water flow transmitter, 17 is an ultrafiltration membrane component unit, 18 is an ultrafiltration upper part drain valve, 19 is an ultrafiltration lower part drain valve, 20 is an ultrafiltration drainage online pH meter, 21 is an ultrafiltration drainage online turbidity meter, 22 is a drain valve, 23 is a recovery water valve, 24 is an ultrafiltration membrane wire automatic detection unit, 25 is an ultrafiltration inlet valve, 26 is an ultrafiltration backwashing air inlet pressure transmitter, 27 is an ultrafiltration air inlet pressure reducing valve, 28 is an ultrafiltration membrane wire detection device air inlet valve, 29 is an ultrafiltration membrane wire detection device pressure transmitter air inlet valve, and 30 is an ultrafiltration membrane wire detection device air inlet pressure reducing valve.
Detailed Description
In order to make those skilled in the art better understand the technical solutions of the present invention, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, not all of the embodiments, and do not limit the scope of the disclosure of the present invention. Moreover, in the following description, descriptions of well-known structures and techniques are omitted so as to not unnecessarily obscure the concepts of the present disclosure. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
There is shown in the drawings a schematic block diagram of a disclosed embodiment in accordance with the invention. The figures are not drawn to scale, wherein certain details are exaggerated and possibly omitted for clarity of presentation. The shapes of various regions, layers and their relative sizes and positional relationships shown in the drawings are merely exemplary, and deviations may occur in practice due to manufacturing tolerances or technical limitations, and a person skilled in the art may additionally design regions/layers having different shapes, sizes, relative positions, according to actual needs.
Referring to fig. 1, the ultrafiltration automatic control system of the present invention comprises a data analysis and control unit 1, a clean water pump 2, an ultrafiltration inlet water flow transmitter 3, a self-cleaning filter 4, an ultrafiltration inlet water on-line turbidity meter 5, an ultrafiltration inlet water valve 6, an ultrafiltration inlet water pressure transmitter 7, an ultrafiltration backwash water pump 8, an ultrafiltration backwash inlet water on-line pH meter 9, an ultrafiltration inlet and outlet water differential pressure transmitter 10, an ultrafiltration backwash inlet water valve 11, an ultrafiltration backwash inlet water pressure transmitter 12, an ultrafiltration product water pressure transmitter 13, an ultrafiltration product water on-line turbidity meter 14, an ultrafiltration product water valve 15, an ultrafiltration product water flow transmitter 16, an ultrafiltration membrane component unit 17, an ultrafiltration upper drain valve 18, an ultrafiltration lower drain valve 19, an ultrafiltration drain water on-line pH meter 20, an ultrafiltration drain on-line turbidity meter 21, a drain valve 22, a recovery water valve 23, an ultrafiltration membrane silk automatic detection unit 24, an ultrafiltration inlet valve 25, an ultrafiltration membrane silk automatic detection unit 24, an ultrafiltration membrane silk control unit 25, a water outlet valve 24, a water outlet valve 2, a water outlet water pressure transmitter 10, an ultrafiltration membrane, An ultrafiltration backwashing air inlet pressure transmitter 26, an ultrafiltration air inlet pressure reducing valve 27, an ultrafiltration membrane wire detection device air inlet valve 28, an ultrafiltration membrane wire detection device pressure transmitter air inlet valve 29 and an ultrafiltration membrane wire detection device air inlet pressure reducing valve 30;
the outlet of the ultrafiltration backwashing water pump 8, the outlet of the acid adding device, the outlet of the alkali adding device and the outlet of the sodium hypochlorite adding device are connected by pipelines and pipes, and then are divided into two paths according to an ultrafiltration backwashing water inlet on-line pH meter 9, an ultrafiltration backwashing water inlet valve 11 and an ultrafiltration backwashing water inlet pressure transmitter 12, wherein one path is communicated with an ultrafiltration water production pipeline through an ultrafiltration water production pressure transmitter 13, an ultrafiltration water production on-line turbidity meter 14, an ultrafiltration water production valve 15 and an ultrafiltration water production flow transmitter 16, the other path is communicated with the top inlets of all ultrafiltration membrane component units 17, the upper water outlet of all the ultrafiltration membrane component units 17 is communicated with the inlet of an ultrafiltration upper water discharge valve 18, the outlet of the clean water pump 2 is divided into two paths sequentially through an ultrafiltration water inlet flow transmitter 3, a self-cleaning filter 4, an ultrafiltration water inlet on-line turbidity meter 5, an ultrafiltration water inlet valve 6 and an ultrafiltration water inlet pressure transmitter 7, wherein one path is communicated with the lower water outlet of all the ultrafiltration membrane component units 17, the other path is communicated with an inlet of an ultrafiltration lower drain valve 19, an outlet of the ultrafiltration lower drain valve 19 and an outlet of an ultrafiltration upper drain valve 18 are communicated with an inlet of a recovery water valve 23 and a discharge valve 22 through pipelines and pipes in sequence after passing through an ultrafiltration drainage online pH meter 20 and an ultrafiltration drainage online turbidity meter 21, and an outlet of the recovery water valve 23 is communicated with a recovery water tank;
the outlet of the compressed air pipeline is divided into two paths, wherein one path is communicated with the lower water outlet of each ultrafiltration membrane component unit 17 through an ultrafiltration air inlet pressure reducing valve 27, an ultrafiltration backwashing air inlet pressure transmitter 26 and an ultrafiltration air inlet valve 25, the other path is communicated with an ultrafiltration membrane wire automatic detection unit 24 through an ultrafiltration membrane wire detection device air inlet pressure reducing valve 30, an ultrafiltration membrane wire detection device pressure transmitter air inlet valve 29 and an ultrafiltration membrane wire detection device air inlet valve 28, and the ultrafiltration membrane wire automatic detection unit 24 is communicated with the lower water outlet of each ultrafiltration membrane component unit 17.
The ultrafiltration water inlet and outlet differential pressure transmitter 10 is communicated with the outlet of the ultrafiltration water inlet valve 6 and the inlet of the ultrafiltration water production pressure transmitter 13.
The input end of the data analysis and control unit 1 is connected with the control end of an ultrafiltration water inlet flow transmitter 3, an ultrafiltration water inlet on-line turbidity meter 5, an ultrafiltration water inlet pressure transmitter 7, an ultrafiltration water inlet and outlet differential pressure transmitter 10, an ultrafiltration water production pressure transmitter 13, an ultrafiltration water production on-line turbidity meter 14, an ultrafiltration water production flow transmitter 16, an ultrafiltration drainage on-line pH meter 20 and an ultrafiltration drainage on-line turbidity meter 21, and the output end of the data analysis and control unit 1 is connected with the control end of an ultrafiltration backwashing water pump 8, an ultrafiltration backwashing water inlet valve 11, an ultrafiltration water production valve 15, an ultrafiltration upper part drain valve 18, an ultrafiltration lower part drain valve 19, a clear water pump 2, a water inlet valve ultrafiltration 6, an ultrafiltration air inlet valve 25, an ultrafiltration membrane wire detection device air inlet valve 28, a recovery water valve 23, a discharge valve 22, an acid adding device, an alkali adding device and a sodium hypochlorite adding device.
The specific working process of the invention is as follows:
1) automatic control of ultrafiltration
A) Automatic flushing before delivery:
automatically opening a drain valve 18 and a recovery water valve 23 at the upper part of the ultrafiltration, then opening an ultrafiltration water inlet valve 6, starting a clean water pump 2, and flushing the ultrafiltration, wherein the ultrafiltration water inlet valve 6 is a regulating valve, the clean water pump 2 is a variable frequency pump or a power frequency pump, and in the automatic flushing process, the condition that the turbidity of ultrafiltration discharge water is less than or equal to the turbidity of ultrafiltration inlet water is taken as an end condition, and the water inlet pressure of an ultrafiltration membrane component unit 17 is controlled to be less than or equal to 0.25MPa in the automatic flushing process of the ultrafiltration.
B) And (3) ultrafiltration operation:
after the automatic washing is finished, the ultrafiltration water inlet valve 6 is kept in an open state, the ultrafiltration water production valve 15 is automatically opened, after the ultrafiltration water production valve 15 is opened and fed back to the proper position, the drain valve 18 and the recovery water valve 23 on the upper part of the ultrafiltration are closed, the ultrafiltration membrane component unit 17 enters a water production state, the ultrafiltration water inlet valve 6 is automatically adjusted according to the ultrafiltration water production flow set value in the water production process, the ultrafiltration water production flow set value is adjustable, the ultrafiltration membrane component unit 17 is automatically backwashed once after generally running for 30-40 min, the running time value of the ultrafiltration membrane component unit 17 is adjustable, and the water inlet pressure of the ultrafiltration membrane component unit 17 is controlled to be less than or equal to 0.25MPa in the ultrafiltration automatic running process.
C) Ultrafiltration air-water backwashing:
the ultrafiltration membrane component unit 17 automatically enters a water backwashing state after running for 30-40 min, and the water backwashing is divided into a plurality of steps of drainage, air washing, upper backwashing, lower backwashing and washing, and specifically comprises the following steps:
(1) draining:
and (3) automatically stopping the clean water pump 2, closing the ultrafiltration water inlet valve 6 and the ultrafiltration water production valve 15, opening the recovery water valve 23, the ultrafiltration upper part drain valve 18 and the ultrafiltration lower part drain valve 19, draining water to the top of the membrane element, and automatically controlling the water draining process according to time, wherein the time value is adjustable.
(2) Air scrubbing:
keeping the opening state of the ultrafiltration upper part drain valve 18 and the recovery water valve 23, closing the ultrafiltration lower part drain valve 19, opening the ultrafiltration air inlet valve 25, automatically controlling the water discharge process according to time, and adjusting the time value, wherein an ultrafiltration air inlet pressure reducing valve 27 is arranged on an air inlet pipeline of the ultrafiltration membrane component unit 17, and the pressure of the ultrafiltration air inlet pressure reducing valve 27 can be adjusted to be 0.06 MPa-0.08 MPa in advance.
(3) Draining:
keeping the opening states of the ultrafiltration upper part drain valve 18 and the recovery water valve 23, closing the ultrafiltration air inlet valve 25, opening the ultrafiltration lower part drain valve 19, draining until water is drained completely, automatically controlling the draining process according to time, and adjusting the time value.
(4) Air-water backwashing:
keeping the opening state of the drainage valve 18 at the upper part of the ultrafiltration and the water recovery valve 23, automatically opening the water inlet valve 11 of the ultrafiltration backwashing, closing the drainage valve 19 at the lower part of the ultrafiltration, starting the water pump 8 of the ultrafiltration backwashing, opening the air inlet valve 25 of the ultrafiltration, controlling the water inlet pressure of the ultrafiltration backwashing to be less than or equal to 0.2MPa, automatically controlling the air-water backwashing process according to the time, adjusting the time value, and controlling the pressure after the ultrafiltration air inlet pressure reducing valve 27 to be 0.06 MPa-0.08 MPa.
(5) And (3) backwashing:
and (3) keeping the open states of the ultrafiltration backwashing water inlet valve 11, the ultrafiltration upper part drain valve 18 and the recovery water valve 23, keeping the operation state of the ultrafiltration backwashing water pump 8, automatically closing the ultrafiltration air inlet valve 25, automatically finishing the backwashing process, automatically finishing the ultrafiltration drainage turbidity less than or equal to the ultrafiltration backwashing water inlet turbidity, and controlling the ultrafiltration backwashing water inlet pressure to be less than or equal to 0.2 MPa.
(6) And (3) backwashing:
keeping the open state of the ultrafiltration backwashing water inlet valve 11 and the recovery water valve 23, keeping the running state of the ultrafiltration backwashing water pump 8, automatically opening the ultrafiltration lower part drain valve 19, closing the ultrafiltration upper part drain valve 18, automatically finishing the automatic backwashing process by the ultrafiltration drain turbidity being less than or equal to the ultrafiltration backwashing water inlet turbidity, and controlling the ultrafiltration backwashing water inlet pressure to be less than or equal to 0.2 MPa.
(7) Positive flushing:
and keeping the recovery water valve 23 in an open state, automatically stopping the ultrafiltration backwash water pump 8, automatically opening the ultrafiltration upper part drain valve 18, closing the ultrafiltration backwash water inlet valve 11, closing the ultrafiltration lower part drain valve 19, opening the ultrafiltration water inlet valve 6, and automatically starting the clean water pump 2. The automatic positive flushing process is automatically finished when the turbidity of the ultrafiltration drainage water is less than or equal to the turbidity of the ultrafiltration inlet water, and the ultrafiltration inlet water pressure is controlled to be less than or equal to 0.25 MPa.
(8) After the ultrafiltration positive washing is finished, the ultrafiltration positive washing is automatically switched to an ultrafiltration running state B, and the opening degree of an ultrafiltration water inlet valve 6(6) is tracked and adjusted according to the water production flow before the ultrafiltration air-water backwashing.
The ultrafiltration operation and ultrafiltration air-water backwashing are a complete ultrafiltration water production short period, and after the general ultrafiltration system automatically and circularly finishes N water production short periods, a chemical reinforced backwashing program can be automatically entered, and the number of times of the water production short periods can be adjusted.
D) Ultrafiltration chemical enhanced backwashing:
after the ultrafiltration cycle finishes the Nth water production small period, automatically switching to a chemical reinforced backwashing program, taking alkali washing (NaOH + NaClO) as an example, wherein the acid washing (HCl) process and the alkali washing (NaOH + NaClO) process are the same except that the chemical is added in the dosing backwashing step sequence, and the rest step sequences are the same, and the specific process is as follows:
(1) draining:
automatically stopping the clean water pump 2, closing the ultrafiltration water inlet valve 6 and the ultrafiltration water production valve 15, opening the discharge valve 22, the ultrafiltration upper part drain valve 18 and the ultrafiltration lower part drain valve 19, draining water to the top of the membrane element, automatically controlling the draining process according to time, and adjusting the time value.
(2) Air scrubbing:
keeping the open state of the ultrafiltration upper part drain valve 18 and the discharge valve 22, closing the ultrafiltration lower part drain valve 19, opening the ultrafiltration air inlet valve 25, automatically controlling the air scrubbing process according to time, and adjusting the time value.
The air inlet pipeline of the ultrafiltration membrane component unit 17 is provided with an ultrafiltration air inlet pressure reducing valve 27, and the pressure of the ultrafiltration air inlet pressure reducing valve 27 can be adjusted to be 0.06 MPa-0.08 MPa in advance.
(3) Draining:
and (3) keeping the opening states of the ultrafiltration upper part drain valve 18 and the ultrafiltration discharge valve 22, closing the ultrafiltration air inlet valve 25, opening the ultrafiltration lower part drain valve 19, and draining until water is drained completely, wherein the draining process is automatically controlled according to time, and the time value is adjustable.
(4) Adding medicine and backwashing:
keeping the opening states of an upper drainage valve 18 and a lower drainage valve 22 of the ultrafiltration, closing a lower drainage valve 19 of the ultrafiltration, automatically opening an inlet valve 11 of the ultrafiltration backwash water, starting an ultrafiltration backwash water pump 8, starting a sodium hypochlorite adding device and an alkali adding device (or an acid adding device), automatically and continuously performing alkali washing and acid washing according to actual water quality, and also automatically and alternately performing alkali washing, wherein in the alkali washing process, the pH value of alkali washing liquid is automatically controlled to be about 12, the concentration of NaClO is about 200mg/L, and a NaClO online concentration meter is arranged in the sodium hypochlorite adding device. The pH value of the alkali washing feed liquid is automatically controlled to be about 12, the NaClO concentration is about 200mg/L, and the pH value of the acid washing feed liquid is automatically controlled to be about 2 in the acid washing process. The dosing backwashing process is automatically controlled according to time, and the time value is adjustable.
(5) Soaking:
automatically stopping the ultrafiltration backwashing water pump 8, stopping the sodium hypochlorite adding device and the alkali adding device, and closing the drainage valve 18 at the upper part of the ultrafiltration, the discharge valve 22 and the inlet valve 11 of the ultrafiltration backwashing;
the soaking process is automatically controlled according to time, and the time value is adjustable.
(6) Air scrubbing:
keeping the open state of the ultrafiltration upper part drain valve 18 and the discharge valve 22, closing the ultrafiltration lower part drain valve 19, opening the ultrafiltration air inlet valve 25, and performing the air scrubbing process, wherein the time value is adjustable and is automatically controlled according to the time.
(7) Backwashing:
the backwashing process is the same as the ultrafiltration air-water backwashing step sequence.
E) After the ultrafiltration strengthening and the reverse reaction, the operation state is automatically switched to an ultrafiltration operation state.
2) Data analysis and control unit 1 receives the data that ultrafiltration intake flow transmitter 3, the online turbidity table of ultrafiltration intake 5, ultrafiltration intake pressure transmitter 7, ultrafiltration business turn over water differential pressure transmitter 10, ultrafiltration product water pressure transmitter 13, the online turbidity table of ultrafiltration product water 14 and the ultrafiltration product water flow transmitter 16 detected, carries out integrated analysis to the data that detect again to judge the real-time running state of ultrafiltration membrane subassembly unit 17, specifically does:
A) when the state of the ultrafiltration membrane component unit 17 is abnormal, an alarm signal is generated;
B) when the difference between the inlet water and the outlet water of any ultrafiltration membrane module unit 17 is high or the turbidity of the outlet water is high, performing air-water backwashing on the ultrafiltration membrane module unit 17, and simultaneously starting the standby ultrafiltration membrane module unit 17;
3) the ultrafiltration membrane silk automatic detection unit 24 carries out online detection on the membrane silk of the ultrafiltration membrane component unit 17 according to the patent 202011323626.8 on-line diagnosis device for the integrity of the ultrafiltration membrane of the power plant and the control method thereof.
The invention judges and pre-judges the state of the ultrafiltration system in real time through the data analysis and control unit 1, and the data analysis and control unit 1 carries out centralized automatic (manual) control on the operation and stop of the ultrafiltration system, the air-water backwashing, the chemical reinforced backwashing, the membrane wire detection and the switching between standby ultrafiltration systems. The data analysis and control unit 1 comprehensively evaluates the state of the ultrafiltration system and prejudges the operation trend of the ultrafiltration system, can automatically and accurately control the whole state process of the ultrafiltration system in real time and prejudge the operation trend of the ultrafiltration system, powerfully ensures the stability of the ultrafiltration effluent quality, and has remarkable environmental protection and energy saving benefits.
Claims (8)
1. An automatic control system for ultrafiltration is characterized in that, the device comprises an ultrafiltration backwashing water pump (8), an ultrafiltration water inlet valve (6), a dosing device, an ultrafiltration backwashing water inlet pressure transmitter (12), an ultrafiltration water production pressure transmitter (13), an ultrafiltration water production online turbidity meter (14), an ultrafiltration water production valve (15), an ultrafiltration water production flow transmitter (16), an ultrafiltration water production pipeline, an ultrafiltration upper drain valve (18), a clear water pump (2), an ultrafiltration water inlet flow transmitter (3), an ultrafiltration water inlet online turbidity meter (5), an ultrafiltration water inlet pressure transmitter (7), an ultrafiltration lower drain valve (19), a compressed air pipeline, an ultrafiltration air inlet pressure reducing valve (27), an ultrafiltration backwashing air inlet pressure transmitter (26), an ultrafiltration air inlet valve (25), an ultrafiltration membrane wire automatic detection unit (24), an ultrafiltration drainage online pH meter (20), an ultrafiltration drainage online turbidity meter (21) and an ultrafiltration water inlet and outlet differential pressure transmitter (10);
the outlet of the ultrafiltration backwashing water pump (8) and the outlet of the dosing device are connected in parallel through a pipeline and then divided into two paths through an ultrafiltration backwashing water inlet pressure transmitter (12), wherein one path is communicated with the ultrafiltration water outlet pipeline through an ultrafiltration water production pressure transmitter (13), an ultrafiltration water production online turbidity meter (14), an ultrafiltration water production valve (15) and an ultrafiltration water production flow transmitter (16), the other path is communicated with the top inlets of all ultrafiltration membrane component units (17), the upper water outlet of each ultrafiltration membrane component unit (17) is communicated with the inlet of an ultrafiltration upper drain valve (18), the outlet of the clean water pump (2) is divided into two paths through an ultrafiltration water inlet flow transmitter (3), an ultrafiltration water inlet online turbidity meter (5), an ultrafiltration water inlet valve (6) and an ultrafiltration water inlet pressure transmitter (7) in sequence, and one path is communicated with the lower water outlet of each ultrafiltration membrane component unit (17), the other path is communicated with the inlet of a drainage valve (19) at the lower part of the ultrafiltration;
the outlet of the compressed air pipeline is divided into two paths, wherein one path is communicated with the lower water outlet of each ultrafiltration membrane component unit (17) through an ultrafiltration air inlet pressure reducing valve (27), an ultrafiltration backwashing air inlet pressure transmitter (26) and an ultrafiltration air inlet valve (25), the other path is communicated with an ultrafiltration membrane wire automatic detection unit (24), the ultrafiltration membrane wire automatic detection unit (24) is communicated with the lower water outlet of each ultrafiltration membrane component unit (17), the outlet of an ultrafiltration lower drain valve (19) and the outlet of an ultrafiltration upper drain valve (18) are communicated with an ultrafiltration drainage online turbidity meter (21) through an ultrafiltration drainage online pH meter (20) after being connected in parallel through a pipeline;
the ultrafiltration water inlet and outlet differential pressure transmitter (10) is communicated with the outlet of the ultrafiltration water inlet valve (6) and the inlet of the ultrafiltration water production pressure transmitter (13).
2. The automatic ultrafiltration control system of claim 1, wherein the dosing device comprises an acid dosing device, an alkali dosing device, and a sodium hypochlorite dosing device.
3. The ultrafiltration automatic control system according to claim 2, wherein the outlet of the ultrafiltration backwash water pump (8), the outlet of the acid adding device, the outlet of the alkali adding device and the outlet of the sodium hypochlorite adding device are connected in parallel by pipelines and then divided into two paths according to the ultrafiltration backwash water inlet online pH meter (9), the ultrafiltration backwash water inlet valve (11) and the ultrafiltration backwash water inlet pressure transmitter (12).
4. The ultrafiltration automatic control system according to claim 1, characterized in that the outlet of the clean water pump (2) is divided into two paths after passing through an ultrafiltration inlet flow transmitter (3), a self-cleaning filter (4), an ultrafiltration inlet on-line turbidity meter (5), an ultrafiltration inlet valve (6) and an ultrafiltration inlet pressure transmitter (7) in sequence.
5. The ultrafiltration automatic control system according to claim 1, wherein an outlet of the ultrafiltration lower drain valve (19) and an outlet of the ultrafiltration upper drain valve (18) are connected in parallel through a pipeline, and then sequentially pass through an ultrafiltration drainage online pH meter (20) and an ultrafiltration drainage online turbidity meter (21) and then are communicated with an inlet of a recovery water valve (23) and a discharge valve (22), and an outlet of the recovery water valve (23) is communicated with a recovery water tank.
6. The automatic ultrafiltration control system of claim 1, wherein each ultrafiltration membrane module unit (17) is divided into two groups, one group being a primary ultrafiltration membrane module unit (17) and the other group being a backup ultrafiltration membrane module unit (17).
7. The automatic ultrafiltration control system according to claim 3, further comprising a data analysis and control unit (1); the input end of the data analysis and control unit (1) is connected with an ultrafiltration inlet water flow transmitter (3), an ultrafiltration inlet water online turbidimeter (5), an ultrafiltration inlet water pressure transmitter (7), an ultrafiltration inlet and outlet water differential pressure transmitter (10), an ultrafiltration product water pressure transmitter (13), an ultrafiltration product water online turbidimeter (14), an ultrafiltration product water flow transmitter (16), an ultrafiltration drainage online pH meter (20) and an ultrafiltration drainage online turbidimeter (21);
the output end of the data analysis and control unit 1 is connected with the control ends of an ultrafiltration backwashing water pump (8), an ultrafiltration backwashing water inlet valve (11), an ultrafiltration water production valve (15), an ultrafiltration upper part drain valve (18), an ultrafiltration lower part drain valve (19), a clear water pump (2), an ultrafiltration water inlet valve (6), an ultrafiltration air inlet valve (25), an ultrafiltration membrane wire detection device air inlet valve (28), a recovery water valve (23), a discharge valve (22), an acid adding device, an alkali adding device and a sodium hypochlorite adding device.
8. The automatic ultrafiltration control system of claim 1, wherein the compressed air conduit is in communication with the automatic ultrafiltration membrane filament detection unit (24) via an inlet pressure relief valve (30) of the ultrafiltration membrane filament detection device, an inlet valve (29) of the pressure transmitter of the ultrafiltration membrane filament detection device, and an inlet valve (28) of the ultrafiltration membrane filament detection device.
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| CN202210182381.4A CN114534497A (en) | 2022-02-25 | 2022-02-25 | Automatic ultrafiltration control system |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN115018000A (en) * | 2022-06-21 | 2022-09-06 | 西安热工研究院有限公司 | Data processing system and method of ultrafiltration device of thermal power plant |
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