CN108079791B - Reverse osmosis system with multiple sets of parallel operation and start-stop control method thereof - Google Patents

Reverse osmosis system with multiple sets of parallel operation and start-stop control method thereof Download PDF

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Publication number
CN108079791B
CN108079791B CN201810053165.3A CN201810053165A CN108079791B CN 108079791 B CN108079791 B CN 108079791B CN 201810053165 A CN201810053165 A CN 201810053165A CN 108079791 B CN108079791 B CN 108079791B
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China
Prior art keywords
reverse osmosis
water
osmosis device
pump
equipment
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CN201810053165.3A
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CN108079791A (en
Inventor
刘玉鹏
底广辉
王应高
李贺全
李志成
周新洋
侯巍
张洪江
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State Grid Corp of China SGCC
North China Electric Power Research Institute Co Ltd
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State Grid Corp of China SGCC
North China Electric Power Research Institute Co Ltd
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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
    • B01D61/02—Reverse osmosis; Hyperfiltration ; Nanofiltration
    • B01D61/08—Apparatus therefor
    • 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
    • B01D61/02—Reverse osmosis; Hyperfiltration ; Nanofiltration
    • B01D61/025—Reverse osmosis; Hyperfiltration
    • 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
    • B01D61/02—Reverse osmosis; Hyperfiltration ; Nanofiltration
    • B01D61/10—Accessories; Auxiliary operations
    • 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
    • B01D61/02—Reverse osmosis; Hyperfiltration ; Nanofiltration
    • B01D61/12—Controlling or regulating
    • 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
    • B01D2311/00—Details relating to membrane separation process operations and control
    • B01D2311/22—Details relating to membrane separation process operations and control characterised by a specific duration or time
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D2313/00—Details relating to membrane modules or apparatus
    • B01D2313/24—Specific pressurizing or depressurizing means
    • B01D2313/243—Pumps
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D2317/00—Membrane module arrangements within a plant or an apparatus
    • B01D2317/04—Elements in parallel
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D2317/00—Membrane module arrangements within a plant or an apparatus
    • B01D2317/06—Use of membrane modules of the same kind
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D2321/00—Details relating to membrane cleaning, regeneration, sterilization or to the prevention of fouling
    • B01D2321/02—Forward flushing
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
    • Y02A20/00—Water conservation; Efficient water supply; Efficient water use
    • Y02A20/124—Water desalination
    • Y02A20/131—Reverse-osmosis

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Water Supply & Treatment (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Nanotechnology (AREA)
  • Separation Using Semi-Permeable Membranes (AREA)

Abstract

The invention provides a reverse osmosis system with multiple sets of parallel operation and a start-stop control method thereof, wherein the system comprises the following components: the device comprises a front water tank, four water supply pumps, four reverse osmosis devices, a water production water tank, a flushing pump and a plurality of pipelines; four water supply pumps are connected in parallel on a pipeline between an outlet valve of the front water tank and a water inlet main pipe of the reverse osmosis device, and four reverse osmosis devices are connected in parallel on a pipeline between the water inlet main pipe of the reverse osmosis device and the water producing water tank; the pipeline from the water inlet main pipe of the reverse osmosis equipment to each reverse osmosis equipment is respectively and sequentially provided with a high-pressure pump and a water inlet electric door; the flushing pump is connected to a pipeline between the water producing water tank and the flushing main pipe, and the flushing main pipe is respectively connected with each reverse osmosis device through the pipeline.

Description

Reverse osmosis system with multiple sets of parallel operation and start-stop control method thereof
Technical Field
The invention relates to the technical field of reverse osmosis, in particular to a plurality of sets of reverse osmosis systems which are operated in parallel and a start-stop control method thereof.
Background
At present, reverse osmosis water treatment equipment is widely applied to a preparation system of purified water and desalted water in industrial production. Because of the maintenance and economic requirements, the entire system is typically designed to operate in parallel with multiple sets of reverse osmosis equipment, and is commonly referred to as a reverse osmosis system or reverse osmosis unit. The automatic start-stop control of a single set of reverse osmosis equipment is relatively simple, basically consists of start-up sequential control logic, stop sequential control logic and liquid level start-stop interlocking, but because of no mature multi-set reverse osmosis automatic start-stop control method, a plurality of reverse osmosis systems still adopt semi-automatic operation control systems requiring human intervention.
Disclosure of Invention
In order to solve the technical problems, the embodiment of the invention provides a plurality of sets of reverse osmosis systems which are operated in parallel and a start-stop control method thereof.
In one aspect, embodiments of the present invention provide a plurality of sets of parallel-operated reverse osmosis systems, the reverse osmosis systems comprising: the device comprises a front water tank, four water supply pumps, four reverse osmosis devices, a water production water tank, a flushing pump and a plurality of pipelines;
four water supply pumps are connected in parallel on a pipeline between an outlet valve of the front water tank and a water inlet main pipe of the reverse osmosis device, and four reverse osmosis devices are connected in parallel on a pipeline between the water inlet main pipe of the reverse osmosis device and the water producing water tank; the pipeline from the water inlet main pipe of the reverse osmosis equipment to each reverse osmosis equipment is respectively and sequentially provided with a high-pressure pump and a water inlet electric door; the flushing pump is connected to a pipeline between the water producing water tank and the flushing main pipe, and the flushing main pipe is respectively connected with each reverse osmosis device through the pipeline.
On the other hand, the embodiment of the invention also provides a start-stop control method of the reverse osmosis system with multiple sets of parallel operation, which comprises the following steps:
comparing the number of reverse osmosis devices currently required to operate with the number of reverse osmosis devices currently actually not stopped;
if the number of the reverse osmosis devices needing to be operated currently is larger than the number of the reverse osmosis devices which are not stopped currently, sending out an instruction for starting one reverse osmosis device;
judging whether the first reverse osmosis device, the second reverse osmosis device, the third reverse osmosis device and the fourth reverse osmosis device simultaneously meet the following five conditions:
a1: the starting condition of the first reverse osmosis equipment is met;
a2: the first reverse osmosis device is in a stop state;
a3: the accumulated running time of the first reverse osmosis device does not exceed the accumulated running time of the second reverse osmosis device, or the starting condition of the second reverse osmosis device is not met, or the second reverse osmosis device is not in a stop state;
a4: the accumulated running time of the first reverse osmosis device does not exceed the accumulated running time of the third reverse osmosis device, or the starting condition of the third reverse osmosis device is not met, or the third reverse osmosis device is not in a stop state;
a5: the accumulated running time of the first reverse osmosis device does not exceed the accumulated running time of the fourth reverse osmosis device, or the starting condition of the fourth reverse osmosis device is not met, or the fourth reverse osmosis device is not in a stop state;
if conditions A1, A2, A3, A4 and A5 are all met, an instruction for starting the first reverse osmosis device is sent out so as to execute the starting sequence control of the first reverse osmosis device.
The multi-set parallel operation reverse osmosis system and the start-stop control method thereof realize the automatic control of starting, stopping and standby of the water supply pumps of the multi-set parallel operation reverse osmosis system without human intervention; the method realizes orderly starting and stopping of a plurality of sets of parallel operation reverse osmosis systems according to the length of the accumulated operation time; the system realizes the one-by-one shutdown of the reverse osmosis systems, and avoids the conflict caused by the simultaneous calling of the common equipment flushing pumps by the equipment.
Drawings
In order to more clearly illustrate the embodiments of the invention or the technical solutions in the prior art, the drawings that are required in the embodiments or the description of the prior art will be briefly described, it being obvious that the drawings in the following description are only some embodiments of the invention, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a schematic diagram of a reverse osmosis system in which multiple sets of reverse osmosis devices are operated in parallel according to an embodiment of the present invention;
FIG. 2 is a schematic flow chart of a start-stop control method of a reverse osmosis system according to an embodiment of the present invention;
FIG. 3 is a schematic flow chart of a start-stop control method of a reverse osmosis system according to an embodiment of the present invention;
FIG. 4 is a schematic flow chart of a reverse osmosis start-up device according to an embodiment of the present invention;
FIG. 5 is a schematic flow chart of a reverse osmosis plant shutdown according to an embodiment of the present invention.
FIG. 6 is a schematic diagram of the automatic start-stop control logic of the reverse osmosis system according to an embodiment of the present invention.
Reference numerals:
1 front-mounted water tank 2 first water supply pump
3 second feed pump 4 second feed pump
5 third feed pump 6 first reverse osmosis apparatus
7 second reverse osmosis apparatus 8 third reverse osmosis apparatus
9 fourth reverse osmosis equipment 10 water producing tank
11 flushing pump 12 front-end water tank outlet valve
13 reverse osmosis plant water inlet main 14 first reverse osmosis plant high pressure pump
15 first reverse osmosis plant inlet electric door 16 second reverse osmosis plant high pressure pump
High-pressure pump of water inlet electric door 18 third reverse osmosis device of 17 second reverse osmosis device
High-pressure pump of water inlet electric door 20 fourth reverse osmosis device of 19 third reverse osmosis device
Water inlet electric door 22 flushing main pipe of 21 fourth reverse osmosis equipment
23 pneumatic door of first reverse osmosis unit 24 pneumatic door of second reverse osmosis unit
Pneumatic door of 25 third reverse osmosis unit 26 pneumatic door of fourth reverse osmosis unit
27 water inlet valve 28 of first water feed pump water outlet valve of first water feed pump
29 water inlet valve of second water feed pump 30 water outlet valve of second water feed pump
31 water inlet valve 32 of third water supply pump and water outlet valve of third water supply pump
33 fourth feed pump water inlet valve 34 fourth feed pump water outlet valve
Outlet valve of 35 water producing tank
Detailed Description
The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
The embodiment of the invention provides a plurality of sets of reverse osmosis systems which are operated in parallel, the structure of the reverse osmosis system is shown in figure 1, and the reverse osmosis system mainly comprises: the water supply system comprises a front water tank 1, a water supply pump 2, a water supply pump 3, a water supply pump 4 and a water supply pump 5, first reverse osmosis equipment 7, first reverse osmosis equipment 8, first reverse osmosis equipment 9, a water production water tank 10, a flushing pump 11 and a plurality of pipelines, wherein the first reverse osmosis equipment and the first reverse osmosis equipment 6 are respectively arranged.
Four water supply pumps 2-5 are connected in parallel on the pipeline between the outlet valve 12 of the front water tank 1 and the water inlet main pipe 13 of the reverse osmosis equipment, and four reverse osmosis equipment 6-9 are connected in parallel on the pipeline between the water inlet main pipe 13 of the reverse osmosis equipment and the water production water tank 10. A high-pressure pump 14 and a water inlet electric door 15 are sequentially arranged on the pipeline from the water inlet main pipe 13 of the reverse osmosis equipment to the first reverse osmosis equipment 6; a high-pressure pump 16 and a water inlet electric door 17 are sequentially arranged on the pipeline from the water inlet main pipe 13 of the reverse osmosis equipment to the second reverse osmosis equipment 7; a high-pressure pump 18 and a water inlet electric door 19 are sequentially arranged on the pipelines from the water inlet main pipe 13 of the reverse osmosis equipment to the third reverse osmosis equipment 8; a high-pressure pump 20 and a water inlet electric door 21 are sequentially arranged on the pipelines from the water inlet main pipe 13 of the reverse osmosis equipment to the fourth reverse osmosis equipment 9. The flushing pump 11 is connected to a pipe between the outlet valve 35 of the water-producing tank 10 and the flushing mother pipe 22, and the flushing mother pipe 22 is connected to each reverse osmosis apparatus through pipes, respectively.
In the reverse osmosis system with multiple sets of parallel operation provided by the embodiment of the invention, water in the front water tank is pumped to the reverse osmosis membrane assembly for treatment through the water supply pump and the high-pressure pump, the treated water enters the water production water tank through the pipeline, and the other part of concentrated water carrying a large amount of ions is discharged or recycled to other systems. Because of the characteristics of the reverse osmosis membrane, the whole system cannot perform back flushing, and the water producing side cannot back pressure. Before the high-pressure pump is started, the water in the front-end water tank needs to be led to the inlet of the system by a water supply pump for forward low-pressure flushing. When the system is finished running, the water of the water production water tank is required to be led to the inlet of the system by a flushing pump to carry out forward low-pressure flushing so as to remove impurities and dirt in the reverse osmosis system. The cleaning and dosing systems are omitted in fig. 1, wherein the dosing pump is used for slowing down the scaling and oxidization of the reverse osmosis membrane, and the cleaning system is used for carrying out restorative cleaning when the reverse osmosis membrane is scaled so as to prolong the service life of the membrane assembly.
In an embodiment, among the four water feed pumps, the water feed pump 2 and the water feed pump 3 are first water feed pumps, that is, water feed pumps with smaller water discharge amount, and the water discharge amount of each first water feed pump can be used for a set of reverse osmosis equipment to normally operate. The water feed pump 3 and the water feed pump 4 are second water feed pumps, namely water feed pumps with larger water discharge amount, and the water discharge amount of each second water feed pump can be used for two sets of reverse osmosis equipment to normally operate. Wherein, two first water feed pumps 2 and 3 are standby mutually, two second water feed pumps 4 and 5 are standby mutually, but the first water feed pump and the second water feed pump are not standby mutually. When two first water supply pumps are operated in parallel but one of the two first water supply pumps is stopped due to failure, the system can start one second water supply pump and stop the first water supply pump which is not failed.
In one embodiment, both ends of each water feeding pump are respectively provided with a water inlet valve and a water outlet valve. For example, the first water feed pump 2 is provided with a water inlet valve 27 and a water outlet valve 28 at two ends, the second water feed pump 3 is provided with a water inlet valve 29 and a water outlet valve 30 at two ends, the third water feed pump 4 is provided with a water inlet valve 31 and a water outlet valve 32 at two ends, and the fourth water feed pump 5 is provided with a water inlet valve 33 and a water outlet valve 34 at two ends. These water inlet and outlet valves may be, for example, manual valves whose normal state is a long open state.
In one embodiment, a pneumatic door is provided on each of the pipes between the irrigation main and each of the reverse osmosis units, the pneumatic doors being remotely controllable. For example, a pneumatic gate 23 is provided on the line from the flushing header 22 to the first reverse osmosis unit 6, a pneumatic gate 24 is provided on the line from the flushing header 22 to the second reverse osmosis unit 7, a pneumatic gate 25 is provided on the line from the flushing header 22 to the second reverse osmosis unit 8, and a pneumatic gate 26 is provided on the line from the flushing header 22 to the second reverse osmosis unit 8.
In one embodiment, each reverse osmosis device is provided with a concentrated water discharge pipeline for discharging concentrated water.
The embodiment of the invention also provides a start-stop control method of the reverse osmosis systems which are operated in parallel, and an execution main body of the start-stop control method can be a computer system, a distributed control system and the like. As shown in fig. 2, the start-stop control method mainly includes the following steps:
step 201 compares the number of reverse osmosis units currently in need of operation with the number of reverse osmosis units currently in actual non-stop operation.
For example, when the liquid level of the front tank 1 reaches the set liquid level, the reverse osmosis apparatus is required to operate, the number of reverse osmosis apparatuses currently required to operate is set to R, and the number of reverse osmosis apparatuses currently actually not stopped is set to R0 for convenience. If R is greater than R0, indicating that the reverse osmosis unit should be started up at this point, the operation is performed as per step 202.
Step 202, issuing a command to start a reverse osmosis plant. At this time, it is not pointed out which reverse osmosis device is to be started, specific judgment needs to be performed according to the operation conditions of each reverse osmosis device, and which reverse osmosis device meets the following conditions, and then the reverse osmosis device is started. The first reverse osmosis apparatus 6 is described below as an example.
Step 203, determining whether the first reverse osmosis apparatus 6, the second reverse osmosis apparatus 7, the third reverse osmosis apparatus 8, and the fourth reverse osmosis apparatus 9 simultaneously satisfy the following five conditions:
a1: the start-up condition of the first reverse osmosis apparatus 6 is satisfied, i.e., the first reverse osmosis apparatus 6 is not in any one of the disabled operation state, the in-situ state, or the failure state.
A2: the first reverse osmosis unit 6 is in a standstill, i.e. not currently in operation, nor is it in operation.
A3: the cumulative operation time of the first reverse osmosis device 6 does not exceed the cumulative operation time of the second reverse osmosis device 7, or the start condition of the second reverse osmosis device 7 is not satisfied, or the second reverse osmosis device 7 is not in a stop state, and as long as any one of the above three sub-conditions is satisfied, it is indicated that the condition A3 is satisfied.
Wherein, the first sub-condition in A3 is to find out the equipment with less accumulated running time between the first reverse osmosis equipment 6 and the second reverse osmosis equipment 7, so as to preferentially use the equipment with less accumulated running time to perform reverse osmosis; "the start condition is not satisfied" means that: the device is in a disabled operating state, or in-situ state, or in a fault state, without a start-up condition.
A4: the cumulative operating time of the first reverse osmosis unit 6 does not exceed the cumulative operating time of the third reverse osmosis unit 8, or the start-up condition of the third reverse osmosis unit 8 is not satisfied, or the third reverse osmosis unit 8 is not in a stopped state.
A5: the cumulative operating time of the first reverse osmosis unit 6 does not exceed the cumulative operating time of the fourth reverse osmosis unit 9, or the start-up condition of the fourth reverse osmosis unit 9 is not satisfied, or the fourth reverse osmosis unit 9 is not in a stopped state.
In step 204, if one of the conditions A1, A2, A3, A4, A5 is not met, then no action is taken and the first reverse osmosis apparatus is not started. At this time, it can be judged whether or not the other reverse osmosis apparatus satisfies the above five conditions. For example, it is determined whether or not the first reverse osmosis apparatus 6, the second reverse osmosis apparatus 7, the third reverse osmosis apparatus 8, and the fourth reverse osmosis apparatus 9 simultaneously satisfy the following five conditions: a1': the start-up conditions of the second reverse osmosis device 7 are met; a2': the second reverse osmosis apparatus 7 is in a stopped state; a3': the accumulated running time of the second reverse osmosis device 7 does not exceed the accumulated running time of the first reverse osmosis device 6, or the starting condition of the first reverse osmosis device 6 is not satisfied, or the first reverse osmosis device 6 is not in a stopped state; a4': the accumulated operating time of the second reverse osmosis apparatus 7 does not exceed the accumulated operating time of the third reverse osmosis apparatus 8, or the start-up condition of the third reverse osmosis apparatus 8 is not satisfied, or the third reverse osmosis apparatus 8 is not in a stopped state; a5': the cumulative operating time of the second reverse osmosis unit 7 does not exceed the cumulative operating time of the fourth reverse osmosis unit 9, or the start-up condition of the fourth reverse osmosis unit 9 is not satisfied, or the fourth reverse osmosis unit 9 is not in a stopped state. When the above conditions A1 'to A5' are all satisfied, then the second reverse osmosis apparatus 7 can be started up.
Step 205, if five conditions in step 203 are satisfied, it is indicated that the first reverse osmosis apparatus 6 can be started, and at this time, an instruction is issued to start the first reverse osmosis apparatus 6 to perform the start-up sequence control of the first reverse osmosis apparatus 6.
According to the embodiment of the invention, the accumulated running time is used as the judging basis of the automatic starting sequence of the equipment, the reverse osmosis equipment with short accumulated running time takes precedence in starting, the automatic starting sequence of a plurality of sets of parallel running reverse osmosis systems is realized, and the whole process does not need human intervention, so that unattended operation is truly realized.
Fig. 4 shows a start-up procedure of the reverse osmosis apparatus, and after a command to start up the first reverse osmosis apparatus 6 is issued in step 205, the first reverse osmosis apparatus 6 may be started up in combination according to the procedure shown in fig. 4:
step 401 determines if the intake electric door 15 of the first reverse osmosis apparatus 6 is open and the pneumatic door 23 of the first reverse osmosis apparatus 6 is closed. If the inlet electric door 15 is not opened and/or the air door 23 is not closed, a command to open the inlet electric door 15 of the first reverse osmosis apparatus and a command to close the air door 23 of the first reverse osmosis apparatus are issued (step 402). If the first reverse osmosis unit inlet electric door 15 is open and the first reverse osmosis unit pneumatic door 23 is closed, step 403 is performed.
Step 403, determining whether the number of water supply pumps currently running meets the requirement of reverse osmosis equipment currently running. If the number of water feed pumps currently operated does not meet the requirement of the reverse osmosis equipment currently operated, a command for increasing the water supply amount corresponding to the first water feed pump is issued (step 404). Wherein the first feed pump is used for running a set of reverse osmosis equipment. If the number of water feed pumps currently running meets the requirement of the reverse osmosis equipment currently running, step 405 is performed. At this time, the feed pump is operated to forward flush the first reverse osmosis unit 6.
Step 405, it is determined whether the preset positive flushing time is reached. If the flushing has not reached the preset time, the flushing is continued (step 406), otherwise, step 407 is performed.
Step 407, it is determined whether the inlet electric door 15 of the first reverse osmosis apparatus 6 is closed. If the inlet electric door 15 of the first reverse osmosis apparatus 6 is not closed, a command is issued to close the inlet electric door 15 of the first reverse osmosis apparatus (step 408). If the inlet electric door 15 of the first reverse osmosis unit 6 is closed, step 409 is performed.
Step 409, it is determined whether the high pressure pump 14 of the first reverse osmosis apparatus 6 has been started and the intake electric door 15 of the first reverse osmosis apparatus 6 has been opened. If either or both of the above conditions are not met, a command is issued to activate the first reverse osmosis unit high pressure pump 14 and to open the first reverse osmosis unit intake electrically operated gate 15 (step 410). If the two conditions are satisfied at the same time, the starting is ended.
In one embodiment, if the comparison result of step 201 is: if the number R of reverse osmosis devices currently required to be operated is smaller than the number R0 of reverse osmosis devices currently actually not stopped, it is indicated that a reverse osmosis device needs to be stopped, and at this time, the start-stop control method shown in fig. 2 further includes the steps shown in fig. 3:
step 301, a command to shut down a reverse osmosis plant is issued. At this time, it is not pointed out which reverse osmosis device to stop, and specific judgment needs to be performed according to the operation conditions of each reverse osmosis device, which reverse osmosis device meets the following conditions, and then the reverse osmosis device is stopped. The first reverse osmosis apparatus 6 is described below as an example.
Step 302, determining whether the first reverse osmosis apparatus 6, the second reverse osmosis apparatus 7, the third reverse osmosis apparatus 8, and the fourth reverse osmosis apparatus 9 simultaneously satisfy the following six conditions:
b1: the shutdown condition of the first reverse osmosis unit 6 is satisfied. The "shutdown condition is satisfied", which is an integrated condition for the relevant equipment status, that is, it is understood that the "shutdown condition is not satisfied". "off-stream" and "on-stream" are just names of cis-controls.
B2: the first reverse osmosis unit 6 is currently in operation.
B3: the second reverse osmosis apparatus 7, the third reverse osmosis apparatus 8 and the fourth reverse osmosis apparatus 9 are not in the stopped state and are not maintained for a predetermined time in the stopped state. That is, the remaining reverse osmosis devices are either in an operating state, in a start-up state, or in other non-stop cis-controlling states, and can be delayed for a certain time (e.g., 5 seconds) to ensure that none of the remaining three sets of reverse osmosis devices are in a stop cis-controlling state.
B4: the cumulative operation time of the first reverse osmosis apparatus 6 is not less than the cumulative operation time of the second reverse osmosis apparatus 7, or the shutdown condition of the second reverse osmosis apparatus 7 is not satisfied, or the second reverse osmosis apparatus 7 is in a stopped state.
The first sub-condition in B4 is to find out the device with more accumulated running time between the first reverse osmosis device 6 and the second reverse osmosis device 7, so as to stop the device with more accumulated running time preferentially.
B5: the cumulative operating time of the first reverse osmosis apparatus 6 is not less than the cumulative operating time of the third reverse osmosis apparatus 8, or the shutdown condition of the third reverse osmosis apparatus 8 is not satisfied, or the third reverse osmosis apparatus 8 is in a stopped state.
B6: the cumulative operation time of the first reverse osmosis unit 6 is not less than the cumulative operation time of the fourth reverse osmosis unit 9, or the shutdown condition of the fourth reverse osmosis unit 9 is not satisfied, or the fourth reverse osmosis unit 9 is in a stopped state.
In step 303, if any one of the conditions B1, B2, B3, B4, B5, and B6 is not satisfied, it is determined whether the other reverse osmosis apparatus satisfies the six conditions. For example, B1': the shutdown condition of the second reverse osmosis unit 6 is satisfied; b2': the second reverse osmosis device 6 is currently in operation; b3': the first reverse osmosis device 6, the third reverse osmosis device 8 and the fourth reverse osmosis device 9 are not in the state of stopping the sequential control and are not kept for a preset time in the state of stopping the sequential control; b4': the accumulated running time of the second reverse osmosis device 7 is not less than the accumulated running time of the first reverse osmosis device 6, or the shutdown condition of the first reverse osmosis device 6 is not satisfied, or the first reverse osmosis device 6 is in a stopped state; b5': the accumulated operating time of the second reverse osmosis apparatus 7 is not less than the accumulated operating time of the third reverse osmosis apparatus 8, or the shutdown condition of the third reverse osmosis apparatus 8 is not satisfied, or the third reverse osmosis apparatus 8 is in a stopped state; b6': the cumulative operation time of the second reverse osmosis unit 7 is not less than the cumulative operation time of the fourth reverse osmosis unit 9, or the shutdown condition of the fourth reverse osmosis unit 9 is not satisfied, or the fourth reverse osmosis unit 9 is in a stopped state. When the above conditions B1 'to B6' are all met, then the second reverse osmosis unit 7 can be shut down.
Step 304, if the conditions B1, B2, B3, B4, B5, B6 are all satisfied, which indicates that the first reverse osmosis apparatus 6 can be shut down, an instruction is issued to shut down the first reverse osmosis apparatus 6 to perform the shutdown sequence control of the first reverse osmosis apparatus 6.
In the shutdown control logic of the parallel operation reverse osmosis systems, the embodiment of the invention realizes that reverse osmosis devices enter into shutdown control one by one through judging whether the reverse osmosis systems are in the shutdown process, namely, two or more sets of reverse osmosis systems do not simultaneously perform the shutdown control, thereby avoiding the conflict caused by the simultaneous calling of the common device flushing pumps by the reverse osmosis systems.
Fig. 5 illustrates a shutdown step of the reverse osmosis apparatus, and after a command to shutdown the first reverse osmosis apparatus 6 is issued in step 304, the first reverse osmosis apparatus 6 may be shut down in combination according to the steps illustrated in fig. 5:
step 501 determines whether the high pressure pump 14 of the first reverse osmosis unit, 6, has been shut down. If the high-pressure pump 14 of the first reverse osmosis plant 6 is not shut down, a command is issued to stop the operation of the high-pressure pump 14 of the first reverse osmosis plant (step 502). If the high pressure pump 14 of the first reverse osmosis unit 6 has been deactivated, step 503 is performed.
Step 503, determining whether the number of water pumps currently running meets the requirement of reverse osmosis equipment currently running. If the number of water feed pumps currently running does not meet the requirement of the reverse osmosis equipment currently running, a command of 'reducing the water supply amount corresponding to a first water feed pump' is issued (step 504). Wherein, first feed water pump is used for supplying a set of reverse osmosis equipment operation. If the number of the water feed pumps currently operated meets the requirement of the reverse osmosis equipment currently operated, the process is carried out without going 505.
Step 505 determines whether the inlet electrically operated gate 15 of the first reverse osmosis apparatus 6 is closed. If the inlet electric door 15 of the first reverse osmosis apparatus 6 is not closed, a command is issued to close the inlet electric door 15 of the first reverse osmosis apparatus (step 506). If the inlet electric door 15 of the first reverse osmosis apparatus 6 is closed, step 507 is performed.
Step 507 determines if the pneumatic door 23 of the first reverse osmosis apparatus 6 is open. If the pneumatic door 23 of the first reverse osmosis apparatus 6 is not opened, a command to open the pneumatic door 23 of the first reverse osmosis apparatus is issued (step 508). If the pneumatic door 23 of the first reverse osmosis unit 6 is open, step 509 is performed.
Step 509, it is determined whether the flush pump 11 has been activated. If the rinse pump 11 is not activated, a command to activate the rinse pump 11 is issued (step 510). If the rinse pump 11 is started, step 511 is performed.
In step 511, it is determined whether the flushing has reached a preset time. If the flush does not reach the preset time, the flush is continued (step 512). If the preset backwash time has been reached, step 513 is performed.
In step 513, it is determined whether the flush pump 11 is off. If the flushing pump 11 is not shut down, a command to stop the operation of the flushing pump 11 is issued (step 514). If the flush pump 11 has been shut down, step 515 is performed.
Step 515 determines if the pneumatic door 23 of the first reverse osmosis apparatus 6 is closed. If the pneumatic door 23 of the first reverse osmosis apparatus is not closed, a command is issued to close the pneumatic door 23 (step 516) to complete the shutdown.
In order to more clearly describe the cooperative work among the devices in the reverse osmosis system provided by the embodiment of the invention, the judgment conditions of various operation states of the reverse osmosis device and the required relation between the operation states of the reverse osmosis device and the number and types of the water supply pumps are described.
"operating conditions" of a reverse osmosis plant refer to: the reverse osmosis device is in a normal water producing state. "off-stream condition" of reverse osmosis plant refers to: the reverse osmosis device is neither in the execution process nor in the "running state" of the start-up sequence control program nor the stop sequence control program.
In programming logic, provision is made for operating a first feed pump P Small size When operating a second water supply pump P =1 Big size When the reverse osmosis devices in the multiple sets of parallel reverse osmosis systems are in the "running state" or the "stop state", r=p Small size +2P Big size 。
When r=0, the water supply pump operates in a mode of P Small size ＝0，P Big size ＝0。
When r=1, the water supply pump operates in a mode of P Small size ＝1，P Big size ＝0。
When r=2, the water supply pump operates in a mode of P Small size ＝2，P Big size =0, or P Small size ＝0，P Big size =1, the former is specified to be preferred (i.e. the first feed pump is operated preferentially), and the latter is reserved.
When r=3, the water supply pump operates in a mode of P Small size ＝1，P Big size ＝1。
When r=4, the water supply pump operates in a mode of P Small size ＝2，P Big size =1, or P Small size ＝0，P Big size =2, prescribe the formerPriority (i.e., priority operation of the first feed pump), the latter being ready for use.
The operation conditions of the two large (second water feed pump) pump sets and the two small (first water feed pump) pump sets are distinguished by utilizing the formula, so that the functions of automatic start, stop and standby switching of the reverse osmosis water feed pump according to the operation requirements of a reverse osmosis system are realized, and the whole process does not need human intervention.
The logic may be expressed in text as follows:
when a reverse osmosis plant is operating (r=1), a first feed pump is started. At this time, if the started first feed pump is stopped due to a malfunction, another first feed pump is started. There is no backup between the first and second feed pumps. The failure to cause the shutdown of the feedwater pump is mostly caused by electrical protection actions. The logic provided by embodiments of the present invention only passively receives such fault and outage feedback signals.
When the two sets of reverse osmosis units are operating (r=2), two first feed pumps are started. At this time, if the first feed pump is stopped due to a failure, a second feed pump is started up and the first feed pump that is not failed is stopped.
When three sets of reverse osmosis equipment are operated (r=3), a first water feed pump and a second water feed pump are started, and the second water feed pump is used for operating two sets of reverse osmosis equipment. At this time, if the started first water feed pump is stopped due to a fault, another first water feed pump is started; if the started second feed pump is shut down due to a fault, another second large feed pump is started. There is no backup between the first and second feed pumps.
When four sets of reverse osmosis plants are running (r=4), two first feed pumps and one second feed pump are started. At the moment, if one first water supply pump is stopped due to a fault, the other second water supply pump is started, and the first water supply pump which is not faulty is stopped; if the started second feed pump is shut down due to a fault, another second feed pump is started.
In summary, the start-up and stop process of the feed pump in the reverse osmosis system can be summarized as follows: the number R of reverse osmosis devices needing to be operated is firstly equal to the number R of actual non-stop devices 0 A comparison is made with respect to the number of the cells,and starting and stopping the reverse osmosis equipment according to the comparison result. The comparison results are as follows:
1)R＞R 0 and starting a set of reverse osmosis equipment, and executing start sequence control. When the step of starting the water feed pump is executed, the sequential control is started to send an instruction of increasing the water supply amount corresponding to 1 first water feed pump to the water feed pump group. For example, the running condition before the water supply pump is started is P Small size ＝2，P Big size =0, then P after start-up Small size ＝1，P Big size ＝1。
2)R＝R 0 No action is required, and no start-up or shutdown of reverse osmosis equipment is required.
3)R＜R 0 And stopping a set of reverse osmosis equipment, and executing stop sequence control. When the step of stopping the water supply pump is executed, the control is stopped to send a command of reducing the water supply amount corresponding to 1 small pump to the water supply pump group. For example, the running condition before stopping the feed pump is P Small size ＝2，P Big size =1, then P after stopping Small size ＝1，P Big size ＝1。
By combining the logic, the start-stop control method shown in fig. 2 and 3 is written into a logic control mode, so that a schematic diagram of the control logic of the automatic start-stop of the reverse osmosis system shown in fig. 6 can be obtained. The logic diagram shown in fig. 6 is illustrated by way of example in a reverse osmosis apparatus No. 1.
The reverse osmosis device starts the sequential control program and can be triggered only in the 'stop state', and the stop sequential control program can be triggered only in the 'running state'. When the device is started, the device with short running accumulation timer is started preferentially. When the equipment is stopped, the equipment with long running accumulation timer is stopped preferentially.
When starting, R is more than R 0 The reverse osmosis plant is continuously started up at short, almost simultaneous intervals until r=r 0 . When stopping, it is necessary to determine whether the other 3 sets of reverse osmosis equipment are in the process of stopping. Thus, even if R < R 0 The shutdown sequence control is only executed one by one until r=r 0 . Thus, the conflict generated by the simultaneous calling of the flushing pumps by a plurality of sets of equipment is avoided.
As shown in fig. 6, T1, T2, T3, T4 represent the cumulative operating times of the No. 1 reverse osmosis apparatus (i.e., the first reverse osmosis apparatus 6), the No. 2 reverse osmosis apparatus (i.e., the second reverse osmosis apparatus 7), the No. 3 reverse osmosis apparatus (i.e., the third reverse osmosis apparatus 8), and the No. 4 reverse osmosis apparatus (i.e., the fourth reverse osmosis apparatus 9). The contents within each small box (representing a logical judgment), such as "T1. Gtoreq.T2", "No. 2 out of service condition is not satisfied" and "No. 2 in a stopped state", respectively represent the following judgment logic: "judging whether T1 is not less than T2", "judging whether the shutdown condition of the No. 2 reverse osmosis device is not satisfied" and "whether the No. 2 reverse osmosis device is in a stopped state". The arrow on the right side of the box indicates a long instruction, which is issued only when the above logical determination result is "yes". "OR" means "OR", for example, three judgment logics "T1. Gtoreq.T2" connected together by the same "OR", the "No. 2 shutdown condition not satisfying" and "No. 2 in the stopped state", and "as long as any one of these three judgment logics is judged to be" yes ", the logic judgment box containing" OR "outputs a long instruction". "AND" means "AND" meaning, for example, three judgment logics connected together by the same "AND": "No. 2 is not in the stop-sequence control", AND "No. 4 is not in the stop-sequence control", it means that "only when the judgment results of the three judgment logics are all yes", the logic judgment box containing 'AND' outputs a long instruction ".
In the implementation, the judgment of the running state and the judgment of the stopping state of the No. 1-4 reverse osmosis equipment can be respectively carried out and displayed in a monitoring picture. Normally, running accumulated time T1, T2, T3 and T4 of the No. 1-4 reverse osmosis equipment are respectively carried out and displayed in a monitoring picture. In one embodiment, the running accumulation timer is only manually cleared, and the timer is suspended when no running state exists, and the timer is started or resumed when the reverse osmosis device enters the running state.
The starting, stopping and standby of the water supply pumps of the multiple sets of parallel operation reverse osmosis systems can be automatically controlled without manual intervention; the reverse osmosis system can be started and stopped sequentially according to the accumulated operation time of a plurality of sets of parallel operation reverse osmosis systems; the reverse osmosis equipment can be stopped one by one, and the conflict caused by the fact that the common equipment flushing pump is called by the equipment can be avoided. The method can also be applied to a full-automatic control system of other similar systems.
It will be appreciated by those skilled in the art that embodiments of the present invention may be provided as a method, system, or computer program product. Accordingly, the present invention may take the form of an entirely hardware embodiment, an entirely software embodiment or an embodiment combining software and hardware aspects. Furthermore, the present invention may take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, CD-ROM, optical storage, and the like) having computer-usable program code embodied therein.
The present invention is described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems) and computer program products according to embodiments of the invention. It will be understood that each flow and/or block of the flowchart illustrations and/or block diagrams, and combinations of flows and/or blocks in the flowchart illustrations and/or block diagrams, can be implemented by computer program instructions. These computer program instructions may be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create means for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be stored in a computer-readable memory that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer-readable memory produce an article of manufacture including instruction means which implement the function specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
The principles and embodiments of the present invention have been described in detail with reference to specific examples, which are provided to facilitate understanding of the method and core ideas of the present invention; meanwhile, as those skilled in the art will have variations in the specific embodiments and application scope in accordance with the ideas of the present invention, the present description should not be construed as limiting the present invention in view of the above.

Claims (5)

1. A start-stop control method for a plurality of sets of parallel-operated reverse osmosis systems, wherein the reverse osmosis systems comprise: the device comprises a front water tank, four water supply pumps, four reverse osmosis devices, a water production water tank, a flushing pump and a plurality of pipelines;
four water supply pumps are connected in parallel on a pipeline between an outlet valve of the front water tank and a water inlet main pipe of the reverse osmosis device, and four reverse osmosis devices are connected in parallel on a pipeline between the water inlet main pipe of the reverse osmosis device and the water producing water tank; the pipeline from the water inlet main pipe of the reverse osmosis equipment to each reverse osmosis equipment is respectively and sequentially provided with a high-pressure pump and a water inlet electric door; the flushing pump is connected to a pipeline between the water production tank and the flushing main pipe, the flushing main pipe is respectively connected with each reverse osmosis device through a pipeline, and a pneumatic door is respectively arranged on the pipeline between the flushing main pipe and each reverse osmosis device;
the water feed pump comprises two first water feed pumps and two second water feed pumps, wherein the first water feed pumps are used for running one reverse osmosis device, and the second water feed pumps are used for running two reverse osmosis devices; wherein, the two first water supply pumps are standby, and the two second water supply pumps are standby; when two first water supply pumps are operated but one of the two first water supply pumps is stopped due to failure, a second water supply pump is started and the first water supply pump which is not failed is stopped;
the operation logic of the feed water pump is as follows:
when a set of reverse osmosis equipment is operated, a first water feed pump is started, and at the moment, if the started first water feed pump is stopped due to faults, the other first water feed pump is started;
when the two sets of reverse osmosis equipment are operated, starting the two first water feed pumps, and if the first water feed pumps are stopped due to faults, starting a second water feed pump in a linked mode, and stopping the first water feed pumps which are not faulty;
when three sets of reverse osmosis equipment are operated, a first water feed pump and a second water feed pump are started, the second water feed pump is used for operating two sets of reverse osmosis equipment, and at the moment, if the started first water feed pump is stopped due to faults, the other first water feed pump is started in a linked mode; if the started second water supply pump is stopped due to a fault, another second large water supply pump is started;
when four sets of reverse osmosis equipment are operated, two first water feed pumps and one second water feed pump are started, at the moment, if one first water feed pump is stopped due to failure, the other second water feed pump is started in a linked mode, and the first water feed pump which is not failed is stopped; if the started second water supply pump is stopped due to a fault, another second water supply pump is started;
the start-stop control method comprises the following steps:
comparing the number of reverse osmosis devices currently required to operate with the number of reverse osmosis devices currently actually not stopped;
if the number of the reverse osmosis devices needing to be operated currently is larger than the number of the reverse osmosis devices which are not stopped currently, sending out an instruction for starting one reverse osmosis device;
judging whether the first reverse osmosis device, the second reverse osmosis device, the third reverse osmosis device and the fourth reverse osmosis device simultaneously meet the following five conditions:
a1: the starting condition of the first reverse osmosis equipment is met;
a2: the first reverse osmosis device is in a stop state;
a3: the accumulated running time of the first reverse osmosis device does not exceed the accumulated running time of the second reverse osmosis device, or the starting condition of the second reverse osmosis device is not met, or the second reverse osmosis device is not in a stop state;
a4: the accumulated running time of the first reverse osmosis device does not exceed the accumulated running time of the third reverse osmosis device, or the starting condition of the third reverse osmosis device is not met, or the third reverse osmosis device is not in a stop state;
a5: the accumulated running time of the first reverse osmosis device does not exceed the accumulated running time of the fourth reverse osmosis device, or the starting condition of the fourth reverse osmosis device is not met, or the fourth reverse osmosis device is not in a stop state;
if the conditions A1, A2, A3, A4 and A5 are all met, sending out an instruction for starting the first reverse osmosis equipment so as to execute the starting sequence control of the first reverse osmosis equipment;
if the number of the reverse osmosis devices needing to be operated at present is smaller than the number of the reverse osmosis devices which are not stopped at present, an instruction for stopping one reverse osmosis device is sent out;
judging whether the first reverse osmosis device, the second reverse osmosis device, the third reverse osmosis device and the fourth reverse osmosis device simultaneously meet the following six conditions:
b1: the shutdown condition of the first reverse osmosis device is satisfied;
b2: the first reverse osmosis device is in an operating state;
b3: the second reverse osmosis equipment, the third reverse osmosis equipment and the fourth reverse osmosis equipment are not in the state of stopping the sequential control and are not in the state of stopping the sequential control for a preset time;
b4: the accumulated running time of the first reverse osmosis equipment is not less than the accumulated running time of the second reverse osmosis equipment, or the shutdown condition of the second reverse osmosis equipment is not met, or the second reverse osmosis equipment is in a stopped state;
b5: the accumulated running time of the first reverse osmosis device is not less than the accumulated running time of the third reverse osmosis device, or the shutdown condition of the third reverse osmosis device is not satisfied, or the third reverse osmosis device is in a stopped state;
b6: the accumulated running time of the first reverse osmosis equipment is not less than the accumulated running time of the fourth reverse osmosis equipment, or the shutdown condition of the fourth reverse osmosis equipment is not met, or the fourth reverse osmosis equipment is in a stopped state;
if conditions B1, B2, B3, B4, B5 and B6 are all met, an instruction is sent to shut down the first reverse osmosis device so as to execute the shutdown sequence control of the first reverse osmosis device.
2. The method for controlling start-stop of a plurality of parallel reverse osmosis systems according to claim 1, wherein two ends of the water feed pump are respectively provided with a water inlet valve and a water outlet valve, and the water inlet valve and the water outlet valve are manual gates.
3. The method for controlling start-stop of a plurality of parallel reverse osmosis systems according to claim 1, wherein each reverse osmosis apparatus is provided with a concentrated water discharge pipe.
4. The method for controlling start-stop of a plurality of parallel operation reverse osmosis systems according to claim 1, wherein after the instruction for starting the first reverse osmosis apparatus is issued, the method for controlling start-stop further comprises:
judging whether the water inlet electric door of the first reverse osmosis equipment is opened or not, and the air door of the first reverse osmosis equipment is closed; if not, sending out an instruction for opening the water inlet electric door of the first reverse osmosis device and an instruction for closing the pneumatic door of the first reverse osmosis device;
if the water inlet electric door of the first reverse osmosis device is opened and the air door of the first reverse osmosis device is closed, judging whether the number of water supply pumps running at present meets the requirement of the reverse osmosis device running at present; if the number of the water supply pumps currently operated does not meet the requirement of the reverse osmosis equipment currently operated, sending out an instruction for increasing the water supply amount equivalent to that of a first water supply pump; wherein the first feed pump is used for running a set of reverse osmosis equipment;
if the number of the water supply pumps currently running meets the requirement of the reverse osmosis equipment currently running, judging whether the preset positive washing time is reached; if the preset positive washing time is not reached, continuing washing;
if the preset positive washing time is reached, judging whether the water inlet electric door of the first reverse osmosis equipment is closed; if not, sending out an instruction for closing the water inlet electric door of the first reverse osmosis equipment;
if the water inlet electric door of the first reverse osmosis device is closed, judging whether the high-pressure pump of the first reverse osmosis device is started or not, and if the water inlet electric door of the first reverse osmosis device is opened; if not, sending out a command for starting the high-pressure pump of the first reverse osmosis equipment and a command for opening the water inlet electric door of the first reverse osmosis equipment.
5. The method for controlling start-up and shut-down of a plurality of parallel operating reverse osmosis systems according to claim 1, wherein after the command to shut down the first reverse osmosis apparatus is issued, the method for controlling start-up and shut-down further comprises:
judging whether the high-pressure pump of the first reverse osmosis equipment is shut down; if the high-pressure pump of the first reverse osmosis device is not stopped, sending a command for stopping the high-pressure pump of the first reverse osmosis device;
if the high-pressure pump of the first reverse osmosis device is stopped, judging whether the number of the water supply pumps running currently meets the requirement of the reverse osmosis device running currently; if the number of the water feed pumps currently operated does not meet the requirement of the reverse osmosis equipment currently operated, sending a command for reducing the water supply amount equivalent to that of a first water feed pump, wherein the first water feed pump is used for operating a set of reverse osmosis equipment;
if the number of the water feeding pumps currently operated meets the requirement of the reverse osmosis equipment currently operated, judging whether the water feeding electric door of the first reverse osmosis equipment is closed or not; if the water inlet electric door of the first reverse osmosis device is not closed, sending a command for closing the water inlet electric door of the first reverse osmosis device;
if the water inlet electric door of the first reverse osmosis device is closed, judging whether the pneumatic door of the first reverse osmosis device is opened; if the pneumatic door of the first reverse osmosis device is not opened, sending a command for opening the pneumatic door of the first reverse osmosis device;
if the pneumatic door of the first reverse osmosis device is opened, judging whether the flushing pump is started; if the flushing pump is not started, sending out an instruction for starting the flushing pump;
if the flushing pump is started, judging whether the preset back flushing time is reached; if the preset back flushing time is not reached, continuing flushing;
if the preset back flushing time is reached, judging whether the flushing pump is stopped; if not, sending out an instruction for stopping running the flushing pump;
if the flushing pump is stopped, judging whether the pneumatic door of the first reverse osmosis equipment is closed; if the pneumatic door of the first reverse osmosis device is not closed, a command is issued to close the pneumatic door of the first reverse osmosis device.
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CN112811631B (en) * 2021-01-05 2022-11-11 华能山东石岛湾核电有限公司 Reverse osmosis double-sequence step sequence control method and system
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