CN115947415A - Automatic start-stop control system and method for two-stage reverse osmosis and EDI device - Google Patents
Automatic start-stop control system and method for two-stage reverse osmosis and EDI device Download PDFInfo
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- CN115947415A CN115947415A CN202310073128.XA CN202310073128A CN115947415A CN 115947415 A CN115947415 A CN 115947415A CN 202310073128 A CN202310073128 A CN 202310073128A CN 115947415 A CN115947415 A CN 115947415A
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- 238000001223 reverse osmosis Methods 0.000 title claims abstract description 136
- 238000000034 method Methods 0.000 title claims abstract description 16
- 239000007788 liquid Substances 0.000 claims abstract description 212
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 147
- 239000013505 freshwater Substances 0.000 claims abstract description 102
- 238000011033 desalting Methods 0.000 claims abstract description 24
- 238000000108 ultra-filtration Methods 0.000 claims description 62
- 238000004519 manufacturing process Methods 0.000 claims description 12
- IESFZVCAVACGPH-PEFMBERDSA-N Glu-Asp-Ile Chemical compound CC[C@H](C)[C@@H](C(O)=O)NC(=O)[C@H](CC(O)=O)NC(=O)[C@@H](N)CCC(O)=O IESFZVCAVACGPH-PEFMBERDSA-N 0.000 claims 10
- 239000012141 concentrate Substances 0.000 claims 1
- 239000000126 substance Substances 0.000 abstract description 4
- 238000011010 flushing procedure Methods 0.000 description 4
- 238000010612 desalination reaction Methods 0.000 description 2
- 239000002699 waste material Substances 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 238000013497 data interchange Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000000835 fiber Substances 0.000 description 1
- 238000005342 ion exchange Methods 0.000 description 1
- 239000003014 ion exchange membrane Substances 0.000 description 1
- 239000012528 membrane Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 150000003839 salts Chemical class 0.000 description 1
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- 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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Abstract
The invention discloses an automatic start-stop control system and method for a two-stage reverse osmosis and EDI device, which comprises a first-stage high-pressure pump, a first-stage reverse osmosis, a first-stage fresh water tank, a second-stage high-pressure pump, a second-stage reverse osmosis, a second-stage fresh water tank, an EDI booster pump, EDI, a desalting water tank and a DCS system, wherein the automatic start-stop of equipment is realized according to the liquid level of the water tank, and if a certain water tank reaches a low liquid level, the next-stage equipment is stopped; when the liquid level of the water tank is restored to the middle liquid level, the next-stage equipment is started; when the water tank liquid level reached high liquid level, preceding one-level equipment stopped to reach and realize the purpose that equipment opens and stops automatically according to the water tank liquid level, effectually solved among the prior art because chemical operating personnel are less, if equipment opens and stops to judge and operate by the operating personnel at every turn, greatly increased the possibility of maloperation and the problem of safety risk.
Description
Technical Field
The invention belongs to the technical field of water treatment, and relates to an automatic start-stop control system and method for a two-stage reverse osmosis EDI device.
Background
The existing boiler make-up water treatment system of the gas power plant adopts a full membrane method, and comprises 2 200m devices except a fiber filter and an ultrafiltration device at a pretreatment part 3 Ultrafiltration water tank, 4 units of 120-240m 3 4/h frequency conversion ultrafiltration booster pumps with 150m 3 Perh first-level fresh water pump, 4 pieces of 112m 3 First-level reverse osmosis device of 4 sets of 40m 3 First-level fresh water tank, 4 stations of 123m 3 A second-stage fresh water pump of 4 stages (111 m) 3 Second-stage reverse osmosis device of 4 stages (40 m) 3 Two-stage fresh water tank, 4 stations of 111m 3 Per EDI booster pump, 4 stages 100m 3 Per EDI device, 2 stations 800m 3 A desalting water tank. 4 ultrafiltration play water booster pump export is a female pipe, and follow-up one-level reverse osmosis, second grade reverse osmosis, EDI device are 4 sets of unit systems, and EDI produces water and send to the demineralized water tank through female pipe, and the concentrated water of EDI is retrieved to the one-level fresh water tank.
From the view of water quantity balance and equipment type selection, the flow rates of all the equipment are completely matched. However, in the operation process, firstly, the first-stage fresh water pump, the second-stage fresh water pump and the EDI booster pump are all power frequency pumps, the flow cannot be adjusted, secondly, the first-stage fresh water tank and the second-stage fresh water tank are small in volume, if a flow difference occurs between the front and rear two-stage devices, the long-time operation of the device is difficult to maintain, thirdly, an outlet pipeline of the ultrafiltration booster pump is a main pipe system, the first-stage fresh water pump is changed into a unit system, and due to the reason that the flow distribution is uneven, the device cannot be operated under a rated working condition when a reverse osmosis single device operates and multiple devices operate, fourthly, the outlet valve of the EDI booster pump is a butterfly valve, and the opening degree of the valve is adjusted through a handle instead of a hand wheel, the continuous adjustment of the flow cannot be realized, and based on the reasons, the device cannot realize the long-time continuous operation, and needs to be started and stopped frequently according to the liquid level of the water tank so as to meet the requirements of a unit. However, because the number of chemical operators is small, if the start and stop of the equipment are judged and operated by the operators each time, the possibility of misoperation and safety risks are greatly increased, and therefore the automatic start and stop of the equipment are urgently needed to be realized on the premise of not changing the equipment.
Disclosure of Invention
Aiming at the problems in the prior art, the invention provides a two-stage reverse osmosis and EDI device automatic start-stop control system and method, so that the purpose of realizing automatic start-stop of equipment according to the liquid level of a water tank is achieved, the purpose of automatically starting and stopping the equipment according to the liquid level is realized, and the problems that in the prior art, because less chemical operators are needed, if the equipment is judged and operated by the operators each time, the possibility of misoperation and safety risks are greatly increased are solved.
The invention is realized by the following technical scheme:
an automatic start-stop control system of a two-stage reverse osmosis EDI device comprises,
a DCS system, an ultrafiltration water tank, primary reverse osmosis, secondary reverse osmosis and EDI;
the system comprises an ultrafiltration water tank, a first-stage reverse osmosis system, a second-stage reverse osmosis system and an EDI (extended data interchange) system, wherein a plurality of ultrafiltration booster pumps are arranged at an outlet of the ultrafiltration water tank, the outlet of each ultrafiltration booster pump is sequentially connected with the first-stage reverse osmosis system, the second-stage reverse osmosis system and the EDI, a first-stage fresh water tank is arranged between the first-stage reverse osmosis system and the second-stage reverse osmosis system, a second-stage fresh water tank is arranged between the second-stage reverse osmosis system and the EDI, and a desalted water tank is arranged at an outlet of the EDI; the system comprises an ultrafiltration water tank, an ultrafiltration lift pump, a primary reverse osmosis system, a primary fresh water tank, a secondary reverse osmosis system, a secondary fresh water tank, EDI and a desalting water tank which are all connected with a DCS system.
Preferably, the ultrafiltration water tank, the primary fresh water tank, the secondary fresh water tank and the desalting water tank are all provided with liquid level meters; the liquid level meter is connected with the DCS system.
Preferably, a first-stage high-pressure pump is arranged at an inlet of the first-stage reverse osmosis; the inlet of the primary high-pressure pump is connected with the ultrafiltration booster pump, and the outlet of the primary high-pressure pump is connected with the primary reverse osmosis; and the first-level high-pressure pump is connected with the DCS.
Preferably, a second-stage high-pressure pump is arranged at an inlet of the second-stage reverse osmosis; the inlet of the secondary high-pressure pump is connected with the primary fresh water tank, and the outlet of the secondary high-pressure pump is connected with the secondary reverse osmosis; and the second-level high-pressure pump is connected with the DCS.
Preferably, an EDI booster pump is arranged at an inlet of the EDI, an inlet of the EDI booster pump is connected with the secondary fresh water tank, and an outlet of the EDI booster pump is connected with the EDI; the EDI booster pump is connected with the DCS system.
Preferably, the number of the ultrafiltration water tanks is 2, the number of the ultrafiltration booster pumps is 4,
preferably, the concentrated water outlet of the EDI is connected with the first-stage fresh water tank, and the water production outlet of the EDI is connected with the desalted water tank.
An automatic start-stop control method for a two-stage reverse osmosis EDI device comprises the following steps.
When the liquid level of the ultrafiltration water tank reaches a low liquid level, the primary reverse osmosis starts to stop the operation sequential control, and the equipment stops; when the liquid level of the selected ultrafiltration water tank is recovered from the low liquid level to the medium liquid level, the first-stage reverse osmosis starts operation sequential control, and the equipment is put into operation;
when the liquid level of the primary fresh water tank reaches a low liquid level, the secondary reverse osmosis is started, the operation is stopped and the equipment is stopped; when the liquid level of the primary fresh water tank is restored to the middle liquid level from the low liquid level, the secondary reverse osmosis starts operation sequential control, and the equipment is put into operation; when the liquid level of the primary fresh water tank reaches a high liquid level, the primary reverse osmosis starts and stops the sequential control, and the equipment stops running; when the liquid level of the first-stage fresh water tank is restored to the middle liquid level from the high liquid level, the first-stage reverse osmosis is started to be put into operation for sequential control, and equipment is put into operation;
when the liquid level of the secondary fresh water tank reaches a low liquid level, EDI starts the shutdown sequence control, and the equipment is shut down; when the liquid level of the secondary fresh water tank is restored to the middle liquid level from the low liquid level, the EDI starts operation sequential control, and the equipment is put into operation; when the liquid level of the secondary fresh water tank reaches a high liquid level, the secondary reverse osmosis is started and stopped for sequential control, and the equipment is stopped; when the liquid level of the secondary fresh water tank is restored to the middle liquid level from the high liquid level, the secondary reverse osmosis starts operation sequential control, and the equipment is put into operation;
when the liquid level of the desalting water tank reaches a high liquid level, EDI starts shutdown sequential control, and equipment is shut down; when the liquid level of the desalting water tank is restored from the high liquid level to the medium liquid level, the EDI starts operation sequential control, and the equipment is put into operation;
when water production is stopped, the shutdown sequence control of each device is started at the same time, and all the devices are shut down.
Preferably, the low liquid level and the high liquid level of the primary fresh water tank are 1.5m and 4.5m respectively; the low liquid level of the second-stage fresh water tank is 1.5m, and the high liquid level of the second-stage fresh water tank is 4.5m.
Preferably, the low liquid level of the ultrafiltration water tank is 1.5m; the high liquid level of the desalting water tank is 9.5m.
Compared with the prior art, the invention has the following beneficial technical effects:
the invention provides a two-stage reverse osmosis and EDI device automatic start-stop control system and a method, comprising a DCS system, an ultrafiltration water tank 1, a first-stage reverse osmosis 4, a second-stage reverse osmosis 7 and an EDI10; when the liquid level of the ultrafiltration water tank reaches a low liquid level, the primary reverse osmosis starts to stop running and the equipment stops running; when the liquid level of the selected ultrafiltration water tank is recovered from the low liquid level to the medium liquid level, the first-stage reverse osmosis starts operation sequential control, and the equipment is put into operation; when the liquid level of the primary fresh water tank reaches a low liquid level, the secondary reverse osmosis is started and stopped for sequential control, and the equipment is stopped; when the liquid level of the primary fresh water tank is restored to the middle liquid level from the low liquid level, the secondary reverse osmosis starts operation sequential control, and the equipment is put into operation; when the liquid level of the primary fresh water tank reaches a high liquid level, the primary reverse osmosis starts and stops the sequential control, and the equipment stops running; when the liquid level of the primary fresh water tank is restored to the middle liquid level from the high liquid level, the primary reverse osmosis starts operation sequential control, and equipment is put into operation; when the liquid level of the secondary fresh water tank reaches a low liquid level, EDI starts shutdown sequential control, and equipment is shut down; when the liquid level of the secondary fresh water tank is recovered from the low liquid level to the medium liquid level, EDI starts operation sequence control, and the equipment is put into operation; when the liquid level of the secondary fresh water tank reaches a high liquid level, the secondary reverse osmosis is started and stopped for sequential control, and the equipment is stopped; when the liquid level of the secondary fresh water tank is restored to the middle liquid level from the high liquid level, the secondary reverse osmosis starts operation sequential control, and the equipment is put into operation; when the liquid level of the desalting water tank reaches a high liquid level, EDI starts shutdown sequential control, and equipment is shut down; when the liquid level of the desalting water tank is restored from the high liquid level to the medium liquid level, the EDI starts operation sequential control, and the equipment is put into operation; according to the invention, automatic start-stop of equipment is realized according to the level of the liquid level of the water tank, and if a certain water tank reaches a low liquid level, the next-stage equipment is stopped; when the liquid level of the water tank is restored to the middle liquid level, the next-stage equipment is started; when the liquid level of the water tank reaches a high liquid level, the previous stage of equipment is stopped. When equipment is operated, because the flow does not match, the condition that the water tank is lack of water at a low liquid level or overflows at a high liquid level frequently appears, so that the purpose that the equipment is automatically started and stopped according to the liquid level is realized according to an automatic starting and stopping control method, and the problems that in the prior art, because chemical operators are few, if the equipment is started and stopped at each time, the possibility of misoperation and safety risks are greatly increased because the operators judge and operate are effectively solved.
When the automatic start-stop control sequence control is started, the DCS judges whether the equipment meets the operation condition, and if the equipment meets the operation condition, the operation sequence control of each equipment in the train is started at the same time.
Furthermore, the ultra-filtration water tank, the primary fresh water tank, the secondary fresh water tank and the desalting water tank are all provided with liquid level meters. All level gauges, equipment and water pump all are connected with the DCS system, and the DCS system is as control system, can monitor level gauge, equipment running state, water pump running state etc. through DCS to through operation DCS, can realize opening of equipment and stop control or the opening of water pump and stop control.
Further, if the water tank is usually in the condition that the water yield of the former stage is greater than the water inflow of the latter stage, in order to improve the continuous operation time of the equipment, the middle liquid level is recommended to be close to the high liquid level; if the tank is normally in a situation where the water production of the previous stage is less than the water intake of the next stage, it is recommended that the medium level be close to the low level in order to increase the continuous operation time of the plant.
Furthermore, when the liquid level of the water tank changes and the shutdown sequential control of the first-stage reverse osmosis and the second-stage reverse osmosis is started, the shutdown flushing of equipment is not carried out, the waste of water is reduced, and when the shutdown sequential control of the first-stage reverse osmosis and the second-stage reverse osmosis is started finally when water production is stopped, the shutdown flushing of the equipment is carried out again, so that reverse osmosis scaling is avoided.
Drawings
FIG. 1 is a drawing; automatic start-stop control system diagram of two-stage reverse osmosis and EDI device
In the figure: the system comprises an ultrafiltration water tank 1, an ultrafiltration lift pump 2, a first-stage high-pressure pump 3, a first-stage reverse osmosis 4, a first-stage fresh water tank 5, a second-stage high-pressure pump 6, a second-stage reverse osmosis 7, a second-stage fresh water tank 8, an EDI booster pump 9, an EDI10 and a desalting water tank 11.
Detailed Description
The present invention will now be described in further detail with reference to specific examples, which are intended to be illustrative, but not limiting, of the invention.
In order to make the technical solutions of the present invention better understood, 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, and not all of the embodiments. 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.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used in the description of the invention herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items.
An automatic start-stop control system of a two-stage reverse osmosis EDI device comprises,
a DCS system, an ultrafiltration water tank 1, a primary reverse osmosis 4, a secondary reverse osmosis 7 and an EDI10;
the system comprises an ultrafiltration water tank 1, a plurality of ultrafiltration booster pumps 2, a primary reverse osmosis system 4, a secondary reverse osmosis system 7 and an EDI10, wherein the outlet of each ultrafiltration booster pump 2 is sequentially connected with the primary reverse osmosis system 4, the secondary reverse osmosis system 7 and the EDI10, a primary fresh water tank 5 is arranged between the primary reverse osmosis system 4 and the secondary reverse osmosis system 7, a secondary fresh water tank 8 is arranged between the secondary reverse osmosis system 7 and the EDI10, and a desalted water tank 11 is arranged at the outlet of the EDI10; the ultrafiltration water tank 1, the ultrafiltration lift pump 2, the primary reverse osmosis 4, the primary fresh water tank 5, the secondary reverse osmosis 7, the secondary fresh water tank 8, the EDI10 and the desalting water tank 11 are all connected with the DCS system. The concentrated water outlet of the EDI10 is connected with the first-level fresh water tank 5, and the water production outlet of the EDI10 is connected with the desalted water tank 11.
The ultrafiltration water tank 1, the primary fresh water tank 5, the secondary fresh water tank 8 and the demineralized water tank 11 are all provided with liquid level meters; the liquid level meter is connected with the DCS system;
a first-stage high-pressure pump 3 is arranged at the inlet of the first-stage reverse osmosis 4; the inlet of the first-stage high-pressure pump 3 is connected with the ultrafiltration booster pump 2, and the outlet of the first-stage high-pressure pump 3 is connected with the first-stage reverse osmosis 4; and the first-level high-pressure pump 3 is connected with a DCS system.
A second-stage high-pressure pump 6 is arranged at the inlet of the second-stage reverse osmosis 7; the inlet of the second-stage high-pressure pump 6 is connected with the first-stage fresh water tank 5, and the outlet of the second-stage high-pressure pump 6 is connected with the second-stage reverse osmosis 7; and the second-stage high-pressure pump 6 is connected with a DCS system.
An EDI booster pump 9 is arranged at an inlet of the EDI10, an inlet of the EDI booster pump 9 is connected with the second-stage fresh water tank 8, and an outlet of the EDI booster pump 9 is connected with the EDI10; the EDI booster pump 9 is connected with the DCS system.
The number of the ultrafiltration water tanks 1 is 2, the number of the ultrafiltration booster pumps 2 is 4, wherein the volume of the ultrafiltration water tanks 1 is 200m 3 The treatment water flow of the ultrafiltration booster pump 2 is 120-240m 3 The treatment of a large amount of boiler make-up water can be better met;
wherein the treatment water flow of the first-stage high-pressure pump 3 is 150m 3 H; the treated water flow rate of the first-stage reverse osmosis 4 is 150m 3 H; the salt rejection rate is 75%; the volume of the primary fresh water tank 5 is 40m 3 The flow rate of the treatment water of the two-stage high-pressure pump 6 is 123m 3 H; the treatment water flow of the second-stage reverse osmosis 7 is 111m 3 H; the desalination rate is 90%; the treatment water flow of the EDI booster pump 9 is 111m 3 The flow rate of treated water of/h, EDI is 100m 3 H; the desalination rate is 90%; the volume of the desalting water tank is 800m 3 ；
EDI is a kind of water treatment equipment, namely continuous electric desalting equipment, and is a pure water manufacturing technology combining ion exchange technology, ion exchange membrane technology and ion electromigration technology.
An automatic start-stop control method for a two-stage reverse osmosis EDI device comprises the following steps.
When the liquid level of the ultrafiltration water tank 1 reaches a low liquid level, the primary reverse osmosis 4 is started to stop running and is controlled sequentially, and the equipment stops running; when the liquid level of the selected ultrafiltration water tank 1 is recovered from the low liquid level to the medium liquid level, the primary reverse osmosis 4 starts operation sequential control, and equipment is put into operation;
when the liquid level of the primary fresh water tank 5 reaches a low liquid level, the secondary reverse osmosis 7 is started to stop running, and equipment stops running; when the liquid level of the primary fresh water tank 5 is restored to the middle liquid level from the low liquid level, the secondary reverse osmosis 7 starts operation sequential control, and equipment is put into operation; when the liquid level of the primary fresh water tank 5 reaches a high liquid level, the primary reverse osmosis 4 is started to stop running, and equipment stops running; when the liquid level of the primary fresh water tank 5 is restored to the middle liquid level from the high liquid level, the primary reverse osmosis 4 starts operation sequential control, and equipment is put into operation;
when the liquid level of the secondary fresh water tank 8 reaches a low liquid level, the EDI10 starts the shutdown sequential control, and the equipment is shut down; when the liquid level of the secondary fresh water tank 8 is restored to the middle liquid level from the low liquid level, the EDI10 starts operation sequential control, and the equipment is put into operation; when the liquid level of the secondary fresh water tank 8 reaches a high liquid level, the secondary reverse osmosis 7 is started to stop running, and equipment stops running; when the liquid level of the secondary fresh water tank 8 is restored to the middle liquid level from the high liquid level, the secondary reverse osmosis 7 starts operation sequential control, and equipment is put into operation;
when the liquid level of the desalting water tank 11 reaches a high liquid level, the EDI10 starts the shutdown sequential control, and the equipment is shut down; when the liquid level of the desalting water tank 11 is recovered from the high liquid level to the medium liquid level, the EDI10 starts operation sequential control, and the equipment is put into operation;
when water production is stopped, the shutdown sequence control of each device is started at the same time, and all the devices are shut down.
The low liquid level and the high liquid level of the primary fresh water tank 4 are respectively 1.5m and 4.5m; the low liquid level and the high liquid level of the secondary fresh water tank 8 are respectively 1.5m and 4.5m.
The low liquid level of the ultrafiltration water tank 1 is 1.5m; the high liquid level of the desalting water tank 11 is 9.5m.
Example 1:
2 ultrafiltration water tanks 1, height 5m, the export of which is connected with 2 entrances of 4 ultrafiltration booster pumps through a mother pipe, the export of the ultrafiltration booster pumps 2 is converged into a mother pipe, which is divided into four branches connected to 3 entrances of 4 primary high pressure pumps, the export of the primary high pressure pump 3 is connected with the primary reverse osmosis 4, the primary reverse osmosis 4 produced water enters the primary fresh water tank 5, the export of the primary fresh water tank 5 is connected with the entrance of the secondary high pressure pump 6, the export of the secondary high pressure pump 6 is connected with the secondary reverse osmosis 7, the secondary reverse osmosis 7 produced water enters the secondary fresh water tank 8, the export of the secondary fresh water tank 8 is connected with the EDI booster pump 9, the export of the EDI booster pump 9 is connected with EDI10, the EDI10 produced water enters a desalting water tank 11, and the EDI10 concentrated water enters the primary fresh water tank 5.
The ultrafiltration water tank 1, the primary fresh water tank 5, the secondary fresh water tank 8 and the desalting water tank 11 are all provided with liquid level meters. All level gauges, equipment and water pump all are connected with the DCS system, and the DCS system is as control system, can monitor level gauge, equipment running state, water pump running state etc. through the DCS to through operation DCS, can realize opening of equipment and stop control or the opening of water pump and stop control.
When the equipment runs, because the flow rate is not matched, the conditions of water shortage of a low liquid level or overflow of a high liquid level of the water tank frequently occur, and therefore the purpose that the equipment is automatically started and stopped according to the liquid level is achieved according to the automatic start and stop control method.
When the automatic start-stop control sequence control is started, the DCS judges whether the equipment meets the operation condition, and if the equipment meets the operation condition, the operation sequence control of each equipment in the train is started at the same time.
For the ultrafiltration water tank 1, when the liquid level of the selected ultrafiltration water tank 1 reaches a low liquid level, the situation that insufficient water is available for the operation of the primary reverse osmosis 4 is shown, at the moment, the primary reverse osmosis 4 starts the shutdown sequential control, and the equipment is shut down. When the liquid level of the selected ultrafiltration water tank 1 is recovered from the low liquid level to the medium liquid level, the primary reverse osmosis 4 starts operation sequential control, and the equipment is put into operation.
For the primary fresh water tank 5, when the liquid level of the primary fresh water tank 5 reaches a low liquid level, the situation that no enough water is available to meet the operation of the secondary reverse osmosis 7 is shown, at the moment, the secondary reverse osmosis 7 starts the shutdown sequential control, and the equipment is shut down. When the liquid level of the primary fresh water tank 5 is restored to the middle liquid level from the low liquid level, the secondary reverse osmosis 7 starts operation sequential control, and the equipment is put into operation. When the liquid level of the primary fresh water tank 5 reaches a high liquid level, the water production amount of the primary reverse osmosis 4 is large, at the moment, the primary reverse osmosis 4 is started and stopped for sequential control, and equipment is stopped. When the liquid level of the primary fresh water tank 5 is restored to the middle liquid level from the high liquid level, the primary reverse osmosis 4 starts operation sequential control, and the equipment is put into operation.
For the secondary fresh water tank 8, when the liquid level of the secondary fresh water tank 8 reaches a low liquid level, the fact that no enough water is available for satisfying the operation of the EDI10 is indicated, the EDI10 starts the shutdown sequence control, and the equipment is shut down. When the liquid level of the secondary fresh water tank 8 is restored from the low liquid level to the middle liquid level, the EDI10 starts the operation sequence control equipment to operate. When the liquid level of the secondary fresh water tank 8 reaches a high liquid level, the secondary reverse osmosis 7 produces more water, at the moment, the secondary reverse osmosis 7 is started, the operation is stopped, and the equipment is stopped. When the liquid level of the secondary fresh water tank 8 is restored from the high liquid level to the medium liquid level, the secondary reverse osmosis 7 starts operation sequential control, and the equipment is put into operation.
For the demineralized water tank 11, when the liquid level of the selected demineralized water tank 11 reaches a high liquid level, the EDI10 is indicated to have more water, and at the moment, the EDI10 starts the shutdown sequence control and the equipment is shut down. When the liquid level of the selected desalting water tank 11 is recovered from the high liquid level to the middle liquid level, the EDI10 starts the operation sequence control, and the equipment is put into operation.
The low, medium and high liquid levels of each water tank can be set and adjusted by operators through DCS. Suggested liquid level values of all water tanks: the low liquid level of the ultrafiltration water tank 1 is 1.5m; the low liquid level of the primary fresh water tank 4 is 1.5m, and the high liquid level is 4.5m; the low liquid level of the secondary fresh water tank 8 is 1.5m, and the high liquid level is 4.5m; the high liquid level of the desalting water tank is 9.5m. If the water tank is usually in the condition that the water yield of the previous stage is greater than the water inflow of the next stage, in order to improve the continuous operation time of the equipment, the medium liquid level is recommended to be close to the high liquid level; if the tank is normally in a situation where the water production of the previous stage is less than the water inflow of the subsequent stage, it is recommended that the medium level be close to the low level in order to increase the continuous operation time of the plant.
When water production is stopped, the shutdown sequence control of each device in the row is started at the same time, and all the devices are shut down.
When the liquid level of the water tank changes and the shutdown sequential control of the first-stage reverse osmosis 4 and the second-stage reverse osmosis 7 is started, the shutdown flushing of equipment is not carried out, the waste of water is reduced, and when the shutdown sequential control of the first-stage reverse osmosis 4 and the second-stage reverse osmosis 7 is started finally when water production is stopped, the shutdown flushing of the equipment is carried out again, so that reverse osmosis scaling is avoided.
The foregoing is merely a preferred embodiment of the invention and is not intended to limit the invention in any manner; one of ordinary skill in the art will readily appreciate from the disclosure that the present invention can be practiced as illustrated in the accompanying drawings and described above; however, those skilled in the art should appreciate that they can readily use the disclosed conception and specific embodiments as a basis for designing or modifying other structures for carrying out the same purposes of the present invention without departing from the scope of the invention as defined by the appended claims; meanwhile, any changes, modifications, and evolutions of the equivalent changes of the above embodiments according to the actual techniques of the present invention are still within the protection scope of the technical solution of the present invention.
Claims (10)
1. An automatic start-stop control system of a two-stage reverse osmosis EDI device is characterized by comprising,
a DCS system, an ultrafiltration water tank (1), a primary reverse osmosis (4), a secondary reverse osmosis (7) and an EDI (10);
the system comprises an ultrafiltration water tank (1), a plurality of ultrafiltration booster pumps (2) are arranged at an outlet of the ultrafiltration water tank (1), an outlet of each ultrafiltration booster pump (2) is sequentially connected with a primary reverse osmosis (4), a secondary reverse osmosis (7) and an EDI (10), a primary fresh water tank (5) is arranged between the primary reverse osmosis (4) and the secondary reverse osmosis (7), a secondary fresh water tank (8) is arranged between the secondary reverse osmosis (7) and the EDI (10), and a desalted water tank (11) is arranged at an outlet of the EDI (10); ultrafiltration water tank (1), ultrafiltration elevator pump (2), one-level reverse osmosis (4), one-level fresh water tank (5), second grade reverse osmosis (7), second grade fresh water tank (8), EDI (10) and demineralized water tank (11) all with DCS headtotail.
2. The automatic start-stop control system for the two-stage reverse osmosis EDI device according to claim 1, wherein the ultrafiltration water tank (1), the primary fresh water tank (5), the secondary fresh water tank (8) and the desalted water tank (11) are all provided with liquid level meters; the liquid level meter is connected with the DCS system.
3. The automatic start-stop control system for the two-stage reverse osmosis and EDI device according to claim 1, characterized in that a first-stage high-pressure pump (3) is arranged at the inlet of the first-stage reverse osmosis (4); the inlet of the first-stage high-pressure pump (3) is connected with the ultrafiltration booster pump (2), and the outlet of the first-stage high-pressure pump (3) is connected with the first-stage reverse osmosis (4); the first-level high-pressure pump (3) is connected with a DCS system.
4. The automatic start-stop control system for the two-stage reverse osmosis and EDI device according to claim 1, characterized in that a second-stage high-pressure pump (6) is arranged at the inlet of the two-stage reverse osmosis (7); the inlet of the second-stage high-pressure pump (6) is connected with the first-stage fresh water tank (5), and the outlet of the second-stage high-pressure pump (6) is connected with the second-stage reverse osmosis (7); and the second-stage high-pressure pump (6) is connected with the DCS system.
5. The automatic start-stop control system for the two-stage reverse osmosis and EDI device according to claim 1, wherein an EDI booster pump (9) is arranged at an inlet of the EDI (10), the inlet of the EDI booster pump (9) is connected with the two-stage fresh water tank (8), and an outlet of the EDI booster pump (9) is connected with the EDI (10); the EDI booster pump (9) is connected with the DCS system.
6. The automatic start-stop control system for the two-stage reverse osmosis and EDI device of claim 1, wherein the number of the ultrafiltration water tanks (1) is 2, and the number of the ultrafiltration booster pumps (2) is 4.
7. The automatic start-stop control system for the two-stage reverse osmosis EDI device as defined in claim 1, wherein the concentrate outlet of said EDI (10) is connected to the first-stage fresh water tank (5), and the product outlet of said EDI (10) is connected to the desalted water tank (11).
8. An automatic start-stop control method of a two-stage reverse osmosis EDI device, which is based on the automatic start-stop control system of the two-stage reverse osmosis EDI device in claims 1-7, and is characterized by comprising the following steps.
When the liquid level of the ultrafiltration water tank (1) reaches a low liquid level, the primary reverse osmosis (4) starts to stop the operation sequential control, and the equipment stops the operation; when the liquid level of the selected ultrafiltration water tank (1) is recovered from the low liquid level to the medium liquid level, the primary reverse osmosis (4) starts operation sequential control, and equipment is put into operation;
when the liquid level of the primary fresh water tank (5) reaches a low liquid level, the secondary reverse osmosis (7) starts to stop operation sequential control, and equipment stops operation; when the liquid level of the primary fresh water tank (5) is restored to the middle liquid level from the low liquid level, the secondary reverse osmosis (7) starts operation sequential control, and equipment is put into operation; when the liquid level of the primary fresh water tank (5) reaches a high liquid level, the primary reverse osmosis (4) starts to stop operation sequential control, and equipment stops operation; when the liquid level of the primary fresh water tank (5) is restored to the middle liquid level from the high liquid level, the primary reverse osmosis (4) starts operation sequential control, and equipment is put into operation;
when the liquid level of the secondary fresh water tank (8) reaches a low liquid level, the EDI (10) starts shutdown sequential control, and the equipment is shut down; when the liquid level of the secondary fresh water tank (8) is restored to the middle liquid level from the low liquid level, the EDI (10) starts operation sequence control, and the equipment is put into operation; when the liquid level of the secondary fresh water tank (8) reaches a high liquid level, the secondary reverse osmosis (7) starts to stop the operation sequence control, and the equipment stops the operation; when the liquid level of the secondary fresh water tank (8) is restored to the middle liquid level from the high liquid level, the secondary reverse osmosis (7) starts operation sequential control, and equipment is put into operation;
when the liquid level of the desalting water tank (11) reaches a high liquid level, the EDI (10) starts shutdown sequential control, and the equipment is shut down; when the liquid level of the desalting water tank (11) is recovered from the high liquid level to the medium liquid level, the EDI (10) starts operation sequential control, and the equipment is put into operation;
when water production is stopped, the shutdown sequence control of each device is started at the same time, and all the devices are shut down.
9. The automatic start-stop control method for the two-stage reverse osmosis EDI device according to claim 8, wherein the low liquid level of the primary fresh water tank (4) is 1.5m and the high liquid level is 4.5m; the low liquid level of the secondary fresh water tank (8) is 1.5m and the high liquid level is 4.5m.
10. The automatic start-stop control method for the two-stage reverse osmosis EDI device according to claim 8, wherein the low liquid level of the ultrafiltration water tank (1) is 1.5m; the high liquid level of the desalting water tank (11) is 9.5m.
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