KR20050007712A - Pump control apparatus in seawater desalination system using reverse osmosis - Google Patents

Abstract

PURPOSE: To provide an apparatus for controlling pump in seawater desalination system using reverse osmosis, which allows system operators to easily recognize operation state of total system without going to the field by receiving information such as operation state of pumps from switched installed in the field and then transmitting pump selection orders to selectively control the pumps, thereby stably running the system. CONSTITUTION: In a desalination system which desalinates seawater using reverse osmosis with carrying the seawater and freshwater through a plurality of pumps (10,14), the apparatus for controlling the pumps comprises a plurality of switches (18,19) which sends information regarding operation state generated from the pumps and selectively controls movements of the pumps in accordance with received pump selection orders and a main control part (17) which receives the information regarding the operation state of the pumps to transmit the pump selection order to the switches.

Description

Pump control device in seawater desalination system using reverse osmosis method {PUMP CONTROL APPARATUS IN SEAWATER DESALINATION SYSTEM USING REVERSE OSMOSIS}

The present invention relates to a seawater desalination system, and more particularly, in a seawater desalination system using reverse osmosis, receiving information such as operation states and alarm occurrences of a plurality of pumps from a plurality of switches installed at a site in a main control part. Then, the present invention relates to a pump control apparatus in a seawater desalination system using a reverse osmosis method for selectively controlling a plurality of pumps by transmitting a pump selection command.

Generally, evaporation, reverse osmosis, and freezing are used to prepare fresh water from seawater. The evaporation method uses fresh water by low pressure evaporation at low temperature by lowering the pressure after supplying heat source to seawater. The reverse osmosis method is a method of producing fresh water by pressing 55 to 60 kgf / cm 3 of seawater on the high pressure side of the reverse osmosis membrane.

In the freezing method, when the seawater is cooled below the freezing point (-1.8 ° C), salts in the seawater are excluded from the ice growth phase, and crystals of ice are precipitated, and the ice crystals separate the salts in the concentrated seawater between the crystal surface and the crystals. It is a method of desalination by washing.

Among the above methods, the structure of the system is simple, robust, and can produce a large amount of fresh water at a relatively low cost. Therefore, the evaporation method is used a lot, and the desalination system using the evaporation method is multi-effect and multi-stage flash. It is divided into multi-stage flash distillation, and the multi-stage flash evaporation method is most widely used.

In general, when the solution and the solvent are in contact with each other and try to achieve a thermodynamically stable lean state, the solvent tries to move through the semipermeable membrane to the solution side.

At this time, it is possible to prevent the movement of the solvent by applying an appropriate pressure to the solution side, the pressure is called the osmotic phenomenon, and conversely using this phenomenon to create a fresh water by applying pressure to the seawater desalination using reverse osmosis Technology.

Therefore, reverse osmosis, unlike evaporative desalination, separates freshwater from seawater, which does not involve a phase change between liquid and gas, which requires less energy and can increase freshwater capacity by increasing membrane modules. Recently, it has been a subject of much interest.

In addition, since the amount of salt permeation in the reverse osmosis system is proportional to the concentration difference and not the pressure difference, the amount of water permeation through the membrane is proportional to the pressure difference. The higher, the higher the efficiency of the device.

In fact, in the seawater desalination system using the reverse osmosis method, fresh water is manufactured by continuously applying pressure of about 56-80kg / cm2 to the seawater, and most of the power is required for the high pressure pump used to apply the pressure. In order to recycle the high-pressure energy of the brine discharged from the membrane module, a technology for installing an energy recovery device is also being developed.

On the other hand, the seawater desalination system using the reverse osmosis method, while the system operator monitors the various desalination equipment in the main control unit, and operates in a manner that controls the alarm occurs.

In this case, a plurality of pumps or motors are used in the various desalination facilities for transporting seawater and freshwater, and the pumps or motors can be operated and controlled only in the field so that only the operation status is reported to the main control unit where the system operator is located. Therefore, when an alarm occurs from the pump or motor, the system operator has to move directly to the site to solve the problem, thus increasing the time and cost in the system operation, there is a problem of low efficiency.

Therefore, the present invention has been proposed to solve the above-mentioned conventional problems, in the seawater desalination system using Reverse Osmosis, the operation status of the plurality of pumps from the plurality of switches installed in the field at the main control part, the alarm It is an object of the present invention to provide a device for selectively controlling the plurality of pumps by transmitting a pump selection command after receiving information such as occurrence.

1 is a block diagram showing the configuration of a pump control apparatus in a seawater desalination system using the reverse osmosis method of the present invention.

*** Description of the symbols for the main parts of the drawings ***

10: first pump 11: primary filter

12: secondary filter 13: water regulator

14 second pump 15 reverse osmosis module

16: storage tank 17: main fisherman

18: first switch 19: second switch

In order to achieve the above object, the present invention provides a system for desalination of seawater using reverse osmosis while transporting seawater and freshwater through a plurality of pumps, and transmitting operation state information generated by the plurality of pumps. In addition, a plurality of switches for selectively controlling the operation of the plurality of pumps in accordance with the received pump selection command; And a main control unit receiving operation state information on the plurality of pumps from the plurality of switches, and transmitting a pump selection command to the plurality of switches.

Hereinafter, an embodiment according to the present invention will be described in detail with reference to the accompanying drawings.

Figure 1 is a block diagram showing the configuration of the pump control device in the seawater desalination system using the reverse osmosis method of the present invention, as shown in the reverse osmosis while transporting seawater and fresh water through a plurality of pumps (10,14) In a system for desalination of seawater by using reverse osmosis, the plurality of pumps 10 may be transmitted in accordance with the received pump selection command while also transmitting operating state information generated by the plurality of pumps 10 and 14. A plurality of switches (18, 19) for selectively controlling the operation of (14); Main control unit 17 which receives the operation state information of the plurality of pumps 10 and 14 from the plurality of switches 18 and 19 and transmits a pump selection command accordingly to the plurality of switches 18 and 19. ).

The present invention is assumed to be applied to a seawater desalination system using Reverse Osmosis.

First, the first pump 10 generates a suction force to deliver high pressure seawater to the primary filter 11 through the pipe 20, the seawater is passed through the primary and secondary filters (11, 12) Foreign matter is removed.

In addition, the water supply regulator 13 controls the amount of seawater supplied before supplying the seawater filtered by the secondary filter 12 to the reverse osmosis module 15, and the second pump 14 The pressurized seawater discharged from the water supply regulator 13 is supplied to the reverse osmosis module 15.

Then, the reverse osmosis module 15 is separated from the fresh water from the seawater using a reverse osmosis phenomenon, and then processed into a form that can be used as drinking water by a predetermined treatment such as deodorization, decolorization, pH control, sterilization, After storage in the storage tank 16, it is supplied to domestic or industrial water.

At this time, the various desalination facilities (10 to 16) reports the information on its operation state and the alarm occurrence state to the main control unit 17 at predetermined time intervals, accordingly, the main control unit 17 is the various desalination facilities Control (10 ~ 16).

Meanwhile, in the seawater desalination system, a plurality of pumps 10 and 14 and a motor (not shown) exist to transport the seawater and fresh water, and the plurality of switches 18 and 19 are operated by the plurality of pumps 10, 14. Receiving operation state information, such as whether the normal operation, the occurrence of the alarm occurs in 14) and delivers to the main control unit 17, the main control unit 17 generates a pump selection command according to the operation state information again Outputs to a plurality of switches 18, 19.

Here, the pump selection command includes information for selecting pumps 10 and 14 which are abnormal or to be controlled, and control commands to be performed on the selected pumps 10 and 14.

Then, the plurality of switches 18 and 19 select specific or multiple pumps 10 and 14 to be controlled among the plurality of pumps 10 and 14 according to the pump selection command received from the main controller 17. After that, the selected pumps 10 and 14 are connected and controlled.

That is, the main controller 17 receives the operation state information of the plurality of pumps 10 and 14 connected thereto through the plurality of switches 18 and 19 during normal operation, and then sends a pump selection command to the plurality of switches ( 18, 19 selectively controls a plurality of switches (18, 19) that you want to send to control.

As described above, in the seawater desalination system using reverse osmosis (Reverse Osmosis), after receiving the information such as the operation state of the plurality of pumps, alarm occurrence, etc. from a plurality of switches installed on the site in the main control section, By selectively controlling the plurality of pumps by transmitting a pump selection command, the system operator can easily grasp the operating state of the entire system without going to the field, thereby operating the system stably.

Claims (1)

In a system for desalination of seawater using reverse osmosis while transporting seawater and fresh water through a plurality of pumps, the plurality of pumps transmit operating state information generated by the plurality of pumps and the plurality of pumps according to the received pump selection command. A plurality of switches for selectively controlling the operations of the two pumps; In the seawater desalination system using a reverse osmosis method characterized in that it comprises a main control unit for receiving the operation state information for the plurality of pumps from the plurality of switches, and transmits the pump selection command accordingly to the plurality of switches Pump control unit.