KR20230086835A - Sea water desalting system for prodeced water of variable treatment type, and variable operation method for the same - Google Patents

Abstract

In the reverse osmosis-type seawater desalination system, it is possible to control the operation of the pretreatment process and the salt osmosis process to vary the production quantity and supply it. Accordingly, the current ship-mounted desalination device adjusts the freshwater production quantity as needed to It can be used in various ways depending on the purpose and situation in a desalination device using a reverse osmosis process as well as a ship-mounted desalination device to supply to the region. In addition, when water resources are needed due to island regions or drought, it is produced in a seawater desalination system. Provided is a production quantity variable seawater desalination system and a variable operation method capable of reducing energy consumption by supplying a variable amount of water.

Description

Production quantity variable seawater desalination system and its variable operation method {SEA WATER DESALTING SYSTEM FOR PRODECED WATER OF VARIABLE TREATMENT TYPE, AND VARIABLE OPERATION METHOD FOR THE SAME}

The present invention relates to a seawater desalination system, and more particularly, to a seawater desalination system for variable production quantity that varies production quantity by controlling the operation of a pretreatment process and a salt osmosis process in a reverse osmosis seawater desalination system and its variable operation It's about how.

Conventionally, seawater desalination refers to a series of water treatment processes for obtaining high-purity drinking water, living water, industrial water, etc. by removing dissolved substances including salt from seawater, which is difficult to directly use as living water or industrial water.

As processes used in seawater desalination plants, the evaporation method and the reverse osmosis process are most popularly used.

Specifically, when there is a semi-permeable membrane between two solutions of different concentrations, the phenomenon in which the solvent in a solution with a weak concentration moves toward a solution with a higher concentration due to the difference in osmotic pressure is called osmotic pressure. Reverse osmosis is when the solvent in a concentrated solution passes through a semi-permeable membrane and moves into a dilute solution by applying strong pressure.

At this time, the desalination process using the reverse osmosis method is called a reverse osmosis process, and is composed of a high-pressure pump, a reverse osmosis membrane, and an energy recovery device. The high-pressure pump used at this time serves to provide high pressure so that only water in seawater can pass through the reverse osmosis membrane.

In the case of such a reverse osmosis process, a technology for producing fresh water by applying a pressure higher than the osmotic pressure to seawater using a reverse osmosis membrane can be defined as a reverse osmosis-type seawater desalination technology.

In addition, the reverse osmosis process is widely used not only in Korea but also around the world because of its excellent quality of treated water, small use of land area, and low freshwater production cost compared to the evaporation method. A process-oriented seawater desalination facility has been installed and is in operation. In the case of a seawater desalination facility using such a reverse osmosis process, the facility is designed and manufactured without considering the change in production quantity under the condition of continuous operation.

However, in the case of the reverse osmosis process, it is difficult for non-experts to control the change in production quantity by changing operating conditions, and even though it is necessary to adjust the production quantity according to the site situation when constructing a seawater desalination plant, there is a problem that it cannot be easily adjusted. .

On the other hand, as a prior art, Korean Patent Registration No. 10-2316209 discloses an invention titled "Reverse osmosis seawater desalination system and energy consumption control method thereof", which will be described with reference to FIGS. 1 to 3.

1 is a schematic configuration diagram of a conventional reverse osmosis seawater desalination system, FIG. 2 is a diagram illustrating the configuration of a pretreatment unit in a reverse osmosis seawater desalination system according to the prior art, and FIG. It is a diagram illustrating the configuration of a reverse osmosis process unit in a reverse osmosis seawater desalination system.

Referring to FIG. 1 , the reverse osmosis seawater desalination plant includes a water intake unit 10, a pre-treatment unit 20, a reverse osmosis unit 30, and a post-treatment unit 40.

The water intake unit 10 is for a process of taking seawater, which is raw water for desalination, and allows the raw water to flow into the pretreatment unit 20 by passing through a device such as a filter or a disk filter.

The pretreatment process unit 20 is for a process of removing suspended solids, inorganic compounds, organic contaminants, etc. that may cause contamination or damage to the reverse osmosis membrane. At this time, suspended solids include colloids and particulate matter, inorganic compounds include ions, manganese, calcium carbonate, calcium sulfate, and silicon dioxide, and organic pollutants include organic matter and microorganisms in seawater.

The reverse osmosis process unit 30 refers to a process of removing salt, ions, and organic substances from seawater that has passed through the pretreatment process unit 20 using the reverse osmosis principle, and the semi-permeable membrane used here is called a reverse osmosis membrane. For example, reverse osmosis membranes are manufactured in the form of modules and used in processes, and membrane modules are classified into spiral wound, hollow fiber, tubular, flat sheet, etc. according to their structure. possible.

The post-treatment process unit 40 refers to a process of appropriately treating the water from which salt is removed by the reverse osmosis process unit 30 to suit the final purpose of use. In the post-treatment unit 40, gases such as carbon dioxide and oxygen dissolved in water may be removed, alkalinity and pH may be adjusted, and disinfection may be performed to prevent the reproduction of microorganisms.

Referring to FIG. 2 , in the reverse osmosis seawater desalination system according to the prior art, the pretreatment unit 20 includes a Membrane Tube Bio-Filter (MTBF) unit 21. At this time, the mesh tube filter unit 21 refers to a water treatment process in which the filtration area of dissolved organic substances is maximized by using a mesh tube filter (MTBF) with a mesh outside and a hollow inside.

After performing this mesh tube filter process, a membrane separation process through an ultra-filtration (UF) unit 23 is performed. The ultrafiltration unit 23 is constructed on the principle that the stock solution flows through the ultrafiltration membrane at a high speed, high molecular weight substances are excluded and concentrated by the membrane by the driving force of the pressure difference, and low molecular weight substances and water permeate through the membrane.

In addition, when the turbidity of the product water of the seawater desalination system exceeds the reference value, the mesh tube filter process is stopped, and the process using the dissolved air flotation (DAF) unit 22 is operated. The dissolved air flotation process uses the principle that fine bubbles generated when pressurized water saturated with air is momentarily decompressed are attached to solid particles and oil and separated by rising.

Accordingly, the pretreatment unit is operated so that the mesh tube filter process and the ultrafiltration process are sequentially performed, and when the turbidity of the product water of the mesh tube filter process exceeds the standard value, the dissolved air flotation process replaces the mesh tube filter process to dissolve the dissolved air. The air flotation process and the ultrafiltration process are operated sequentially.

Referring to Figure 3, in the reverse osmosis seawater desalination system according to the prior art, the reverse osmosis process unit 30 includes a membrane module 33; a high-pressure pump 32 providing pressure to water flowing into the membrane module; and a filtrate tank 34 for accommodating filtrate produced in the membrane module 33. At this time, a safety filter 31 may be installed in front of the high-pressure pump 32, and an energy recovery device 35 for recovering energy using the pressure of concentrated water may be installed in the separation membrane module 33. there is. In addition, a booster pump 36 may be installed between the energy recovery device 35 and the membrane module 33 .

According to the reverse osmosis seawater desalination system according to the prior art, the energy consumption limits of the pretreatment process and the reverse osmosis process, which are unit processes constituting the reverse osmosis seawater desalination system, are set, and if the limits are exceeded, the energy consumption for each process It is possible to maintain stable production quantity and energy consumption by automatically checking causes that may affect each step and promptly responding to the part where an error occurs.

However, in the case of the reverse osmosis seawater desalination system according to the prior art described above, there is a limitation in that the production quantity cannot be adjusted according to the site situation.

On the other hand, as another prior art, Korean Patent Registration No. 10-2013255 discloses an invention titled "Seawater Desalination Plant and Control Method", which will be described with reference to FIGS. 4 and 5.

4 is a view showing a desalination plant including a control logic according to the prior art, and FIG. 5 is a detailed configuration diagram of the desalination plant control apparatus shown in FIG. 4 .

Referring to FIG. 4, the seawater desalination plant including the control logic according to the prior art is a reverse osmosis seawater desalination plant, and includes a water intake unit 50, a pretreatment unit 60, a reverse osmosis unit 70, and It includes a control device 80, and may also include a post-treatment process unit and a wastewater treatment facility for treating wastewater generated in the seawater treatment process.

The control device 80 uses a control logic based on P-MFI, which is an index representing the concentration of particles, C-MFI, which represents the concentration of colloids, and the concentration of protein-based organic matter, and the pretreatment unit 60 and the reverse osmosis process. The unit 70 can be controlled.

The pretreatment process 60 may include a DAF process 61, a UF process 62 and/or a DMF process 63. Specifically, the Dissolved Air Flotation (DAF) process 61 is a process of generating a large amount of fine air bubbles and then using them to remove contaminants. The minimum size of the fine air bubbles generated in the DAF process 61 is about 30 μm, and particles smaller than this size cannot be effectively removed in the DAF process 61. Therefore, in order to secure the efficiency of the DAF process 61, a coagulant such as iron chloride (FeCl ₃ ) may be added to coagulate very small particles such as colloids to grow into flocs of sufficient size.

In addition, the pretreatment process unit 60 may include at least one of a UF process 62 and a DMF process 63, and the UF (ultrafiltration) process 62 is for separating substances in raw water using a semi-permeable membrane. It does not pass suspended matter, colloids, and organic polymers, but can pass water, salts, and low-molecular organic substances, so it can be used to remove colloids and organic polymers. In addition, the DMF (Dual Media Filteration) process 63 may remove proteins, particles, contaminants, and the like using porous carriers such as sand, gravel, and anthracite.

The controller 80 controls the P-MFI, C-MFI and protein concentration of the raw water taken in by the water intake unit 50 and/or the P-MFI and C-MFI of the treated water that has passed through the pretreatment unit 60. And based on the protein concentration, control for each process of the pretreatment process unit 60, injection of coagulant, injection of oxidant, prediction and control of reverse osmosis membrane fouling may be performed.

In addition, the controller 80 may control the amount of coagulant injected into the raw water flowing into the DAF process 61 or the treated water after the DAF process 61 in order to increase the size of fine particles such as colloids.

Specifically, referring to FIG. 5, the control device 80 includes an MFI measurement unit 81, a protein measurement unit 82, and a control unit 83, and the control unit 83 includes a coagulant control unit 83a and a DAF control unit. (83b), an oxidizer controller 83c, a filtration controller 83d, and a reverse osmosis controller 83e.

The MFI measurement unit 81 may measure P-MFI and C-MFI of seawater taken in from the water intake unit 110 and treated water that has passed through the pretreatment unit 60, for example, raw water or treated water. It is possible to use MMAS (Multiple Membrane Array System) that can measure P-MFI and C-MFI by sequentially evaluating particles and colloids included in the membrane using two membranes.

The protein measurement unit 82 can measure the protein concentration of the seawater and the treated water, and can distinguish humic-based organic matter and proteins contained in the seawater or treated water using FEEM (Fluorescence Excitation-Emission Matrix), , based on which the protein concentration can be measured.

The control unit 83 may control the process of the seawater desalination plant based on the PMFI, C-MFI, and protein concentration of seawater and treated water measured by the MFI measurement unit 81 and the protein measurement unit 82.

The coagulant control unit 83a can set the amount of the coagulant injected into the seawater, and since the DAF process and/or the filtration process included in the pretreatment process can remove particles, colloids, or proteins of a certain size, especially colloids, Fine particles need to be agglomerated using a coagulant to increase their size.

The DAF controller 83b may determine whether to perform the DAF process based on the P-MFI of seawater. Since this DAF process requires considerable power to operate, in order to reduce power consumption, the DAF process is not performed when the P-MFI is below a certain value, and the DAF process is performed only above a certain value. .

The filtration controller 83d may determine the filtration rate of the filtration process included in the pretreatment process of the seawater desalination plant based on the C-MFI, P-MFI, and protein concentration of the treated water. The filtration process may be a UF process and/or a DMF process, and generally, the faster the filtration rate, the smaller the amount of particles or proteins removed.

The oxidizing agent controller 83c may determine the amount of the oxidizing agent to be injected into the treated water based on the protein concentration of the seawater. At this time, the oxidizing agent is used to remove microorganisms that may cause fouling in the reverse osmosis membrane, and a high protein concentration may indicate that there are many microorganisms in the treated water. Therefore, the oxidizing agent controller 83c may control the amount of oxidizing agent injected into the treated water in proportion to the seawater protein concentration.

The reverse osmosis controller 83e predicts the degree of fouling of the reverse osmosis membrane used in the reverse osmosis process of the seawater desalination plant based on the C-MFI, P-MFI and protein concentration of the treated water, and cleans the reverse osmosis membrane based on the prediction. Set timing and/or exchange timing. At this time, the degree of fouling of the reverse osmosis membrane may increase as the C-MFI, P-MFI, and protein concentrations of the treated water increase, and accordingly, it is necessary to reduce the washing period or replace the reverse osmosis membrane.

In the case of a seawater desalination plant according to the prior art, the pretreatment process unit 60 uses the turbidity of raw water (seawater), Total Suspended Solid (TSS) or Total Organic Carbon (TOC) as a water quality index, based on these water quality indexes. As a result, the configuration, capacity and operation of the pretreatment process 60 can be designed. On the other hand, the reverse osmosis process unit 70 generally designs operating conditions based on Silt Density Index (SDI).

However, in the case of the seawater desalination plant according to the above-described prior art, there is a limitation that the amount of production cannot be adjusted according to field conditions.

Republic of Korea Patent Registration No. 10-2316209 (registration date: October 18, 2021), title of invention: "Reverse osmosis seawater desalination system and its energy consumption control method" Republic of Korea Patent Registration No. 10-2013255 (registration date: August 28, 2019), title of invention: "Seawater Desalination Plant and Control Method" Republic of Korea Utility Model Registration No. 20-373511 (registration date: January 7, 2005), designation: "Reverse osmosis seawater desalination device" Republic of Korea Patent Registration No. 10-1319412 (registration date: October 11, 2013), title of invention: "Operation method of two-stage flow rate divergent reverse osmosis seawater desalination process" Republic of Korea Patent Registration No. 10-1749937 (registration date: June 16, 2017), title of invention: "Seawater desalination device with filtration pre-treatment function" Republic of Korea Patent Publication No. 2002-94526 (Publication date: December 18, 2002), title of invention: "Reverse osmosis seawater desalination system for energy saving"

The technical problem to be achieved by the present invention for solving the above-mentioned problems is a production quantity variable type seawater desalination that can be supplied by varying the production quantity by controlling the operation of the pretreatment process and the salt osmosis process in the reverse osmosis seawater desalination system. It is to provide a system and its variable operation method.

Another technical problem to be achieved by the present invention is a seawater desalination system for varying production quantity, which can reduce energy consumption by supplying a variable amount of production in the seawater desalination system when water resources are needed due to island regions or drought, and the like. It is to provide a variable operation method.

As a means for achieving the above-mentioned technical problem, the production quantity variation type seawater desalination system according to the present invention is a seawater desalination system using a reverse osmosis process, a water intake process unit for taking in seawater, which is raw water for seawater desalination; a pretreatment unit having a pretreatment product water flow meter and a supply pump and preprocessing and removing suspended solids, inorganic compounds, and organic contaminants that may cause contamination or damage to the reverse osmosis membrane; A reverse osmosis process unit having a fresh water production water flowmeter and a high-pressure pump, and producing fresh water by removing salt from seawater introduced through the pretreatment process unit using a reverse osmosis membrane; a post-treatment unit for post-processing the water desalinized by the reverse osmosis unit to suit the final purpose of use; And a seawater desalination production quantity variable control device for variably controlling the operation of the seawater desalination process while changing the production quantity, wherein the seawater desalination production quantity variable control apparatus controls the production quantity in a seawater desalination system using a reverse osmosis process. It is characterized in that the variable operation of the pretreatment process unit and the reverse osmosis process unit while varying according to

Here, the seawater desalination production quantity variation control device includes a target production quantity setting unit for setting a target production quantity for seawater desalination; a pre-processing amount calculation unit for calculating a pre-processing amount to be processed by the pre-processing unit; a pre-process operation control unit controlling the pre-process operation of the pre-process unit; a pre-processing amount determining unit that checks whether the pre-processing amount of the pre-processing unit reaches a set value; a reverse osmosis process operation control unit controlling operation of the reverse osmosis process of the reverse osmosis process unit when the amount of the pretreatment reaches a set value; a reverse osmosis production amount determination unit that checks whether the reverse osmosis production amount of the reverse osmosis process unit has reached a set value; and a fresh water supply amount control unit for variably controlling the fresh water supply amount when the reverse osmosis production amount reaches a set value.

)인

에 의해 산출되고. 여기서,

는 역삼투공정 최종 생산수량(생산유량)을 나타내고,

은 역삼투공정 설정 회수율을 각각 나타내는 것을 특징으로 한다.Here, the pre-processing amount calculated by the pre-processing amount calculation unit is the pre-processing process production quantity (

)person

is calculated by here,

Represents the final production quantity (production flow rate) of the reverse osmosis process,

It is characterized in that each represents the set recovery rate of the reverse osmosis process.

Here, the pre-processing amount determination unit may determine whether the pre-processing amount reaches a set value from a pre-processing product water flowmeter installed in the pre-processing unit.

Here, the seawater desalination production quantity variation control device includes a supply pump rotation speed controller for increasing the rotation speed of the supply pump installed in the pre-treatment process unit to control the pre-treatment process operation when the pre-treatment production amount does not reach the set value. can be further included.

Here, the reverse osmosis production amount determination unit may determine whether the reverse osmosis production amount reaches a set value from a flow meter installed in the reverse osmosis process unit.

Here, the seawater desalination production quantity variation control device increases the pressure of the high-pressure pump installed in the reverse osmosis process unit to control the reverse osmosis process operation when the reverse osmosis production amount does not reach the set value. A control unit may be further included.

Here, the fresh water supply amount controller notifies the driver of fresh water production and power consumption and changes the target production amount.

On the other hand, as another means for achieving the above-described technical problem, the variable operation method of the production quantity variable seawater desalination system according to the present invention is composed of a water intake process unit, a pretreatment process unit, a reverse osmosis process unit, and a post-treatment process unit. A variable operation method of a seawater desalination system, comprising: a) setting a target production quantity for seawater desalination by a seawater desalination variable production quantity control device; b) calculating, by the seawater desalination production quantity variation type control device, the amount of pre-processing production to be processed in the pre-processing unit; c) controlling the pretreatment process operation of the pretreatment process unit by the seawater desalination production quantity variation control device; d) checking, by the desalination control device, whether the pre-processing output of the pre-processing unit reaches a set value; e) controlling the operation of the reverse osmosis process of the reverse osmosis unit by the seawater desalination production quantity variation control device when the pretreatment production amount reaches the set value; f) checking whether the reverse osmosis production amount of the reverse osmosis process unit has reached a set value; and g) when the reverse osmosis production amount reaches a set value, the seawater desalination production amount variable control device variably adjusting the fresh water supply, wherein the seawater desalination production amount variable control device performs a reverse osmosis process. In the used seawater desalination system, the pretreatment process unit and the reverse osmosis process unit are variablely operated while varying the production volume according to the situation.

)인

에 의해 산출되고. 여기서,

는 역삼투공정 최종 생산수량(생산유량)을 나타내고,

은 역삼투공정 설정 회수율을 각각 나타내는 것을 특징으로 한다.Here, the pretreatment production volume of step b) is the pretreatment process production quantity (

)person

is calculated by here,

Represents the final production quantity (production flow rate) of the reverse osmosis process,

It is characterized in that each represents the set recovery rate of the reverse osmosis process.

Here, in the step d), it can be confirmed whether the pre-treatment production amount reaches a set value from the pre-treatment product water flow meter installed in the pre-treatment process unit.

Here, in the step d), when the amount of pretreatment does not reach the set value, the operation of the pretreatment process may be controlled by increasing the number of rotations of the supply pump installed in the pretreatment process unit.

Here, in the step f), it may be checked whether the amount of reverse osmosis production has reached a set value from a flow meter installed in the reverse osmosis process unit.

Here, when the amount of reverse osmosis production does not reach the set value in step f), the operation of the reverse osmosis process may be controlled by increasing the pressure of the high-pressure pump installed in the reverse osmosis process unit.

According to the present invention, in a seawater desalination system of the reverse osmosis method, it is possible to control the operation of the pretreatment process and the salt osmosis process to supply a variable amount of production water, and accordingly, fresh water is produced as needed in the ship-mounted desalination device currently being performed. It can be used in various ways depending on the purpose and situation in not only ship-mounted desalination devices but also desalination devices using reverse osmosis processes so that the water quantity can be adjusted and supplied to island regions.

According to the present invention, when water resources are needed due to island regions or drought, it is possible to reduce energy consumption by variablely adjusting the amount of water produced in the seawater desalination system and supplying it.

1 is a schematic configuration diagram of a conventional reverse osmosis seawater desalination system.
2 is a diagram illustrating the configuration of a pretreatment process unit in a reverse osmosis seawater desalination system according to the prior art.
3 is a diagram illustrating the configuration of a reverse osmosis process unit in a reverse osmosis seawater desalination system according to the prior art.
4 is a view showing a seawater desalination plant including a control logic according to the prior art.
5 is a detailed configuration diagram of the desalination plant control apparatus shown in FIG. 4 .
6 is a block diagram of a production quantity variation type seawater desalination system according to an embodiment of the present invention.
7 is a detailed block diagram of a desalination production quantity variation type control device in the production quantity variation type seawater desalination system according to an embodiment of the present invention.
8 is an operational flow chart illustrating a variable operation method of a variable production quantity seawater desalination system according to an embodiment of the present invention.

Hereinafter, embodiments of the present invention will be described in detail so that those skilled in the art can easily practice with reference to the accompanying drawings. However, the present invention may be embodied in many different forms and is not limited to the embodiments described herein. And in order to clearly explain the present invention in the drawings, parts irrelevant to the description are omitted, and similar reference numerals are attached to similar parts throughout the specification.

Throughout the specification, when a certain component is said to "include", it means that it may further include other components without excluding other components unless otherwise stated. Also, terms such as “… unit” described in the specification refer to a unit that processes at least one function or operation, and may be implemented by hardware, software, or a combination of hardware and software.

[Production amount variable seawater desalination system (100)]

6 is a schematic configuration diagram of a production quantity variable type seawater desalination system according to an embodiment of the present invention, and FIG. 7 is a seawater desalination production quantity variable control device in the production quantity variable seawater desalination system according to an embodiment of the present invention. It is a detailed configuration diagram of

Referring to FIG. 6, the production quantity variable seawater desalination system 100 according to an embodiment of the present invention includes a water intake unit 110, a pre-treatment unit 120, a reverse osmosis unit 130, and a post-treatment unit. (140) and a seawater desalination production quantity variation control device (150).

The water intake process unit 110 takes in seawater, which is raw water for seawater desalination. At this time, it is necessary to take in as clean seawater as possible to reduce the load on the pretreatment process unit 120, and in order to obtain high-quality raw water, deep-sea water intake with a depth of 60 m or more, or water intake wells and water collection wells installed in groundwater aquifers Infiltration galleries and the like can be used. In addition, the collected raw water may be introduced into the pretreatment unit 120 through a device such as a filter or a disk filter to remove sand or the like.

The pretreatment process unit 120 includes a pretreatment product water flow meter 121 and a supply pump 122, and removes suspended solids, inorganic compounds, and organic contaminants that may cause contamination or damage to the reverse osmosis membrane. For example, the suspended solids include colloids and particulate matter, the inorganic compounds include ions, manganese, calcium carbonate, calcium sulfate, and silicon dioxide, and the organic pollutants include organic matter and microorganisms in seawater. Pretreatment processes that are currently commonly applied include those using conventional processes traditionally applied to water treatment such as coagulation, precipitation, and filtration, and those using membrane filtration processes using membranes such as microfiltration membranes or ultrafiltration membranes. In particular, the membrane filtration process requires less space than conventional processes, but generates a lot of wastewater and requires the use of chemicals for membrane cleaning.

In addition, the pretreatment process unit 120 must select an appropriate pretreatment process according to surrounding conditions such as treatment scale or raw water quality, and the inflow raw water quality conditions (eg, turbidity and / or SDI) must be configured to satisfy In general, the pretreatment process unit 120 needs to be treated so that the turbidity is 0.5 or SDI 3 or less. In addition, the pretreatment unit 120 may adjust pH and add a scale inhibitor to remove salts such as carbonate and calcium sulfate, which cause scale in the reverse osmosis membrane of the reverse osmosis unit 130.

In addition, the pretreatment process unit 120 may also perform treatment for organic materials and microorganisms. For example, fouling of a reverse osmosis membrane, that is, a phenomenon in which contaminants attach to the membrane and clog the membrane, is mainly caused by organic substances and microorganisms, and the organic substances are aggregated, precipitated, and filtered in the pretreatment unit 120. However, it can be removed through a disinfection process, and an oxidizing agent can be used or UV disinfection can be performed to remove microorganisms.

The reverse osmosis process unit 130 includes a fresh water production water flow meter 131 and a high-pressure pump 132, and removes salt from seawater introduced through the pretreatment process unit 120 using a reverse osmosis membrane. Specifically, the reverse osmosis membrane is generally formed of an organic synthetic material, and may be composed of, for example, a composite membrane coated with a salt rejection layer on a porous support layer, but is not limited thereto.

The post-treatment process unit 140 appropriately treats the water desalinized by the reverse osmosis process unit 130 to suit the final purpose of use. For example, when using drinking water, it has no taste or smell, is non-corrosive, and must be treated to be properly disinfected, so the post-treatment unit 140 removes gases such as carbon dioxide and oxygen dissolved in water, In addition, alkalinity and pH may be adjusted, and disinfection may be performed to prevent microbial reproduction.

The seawater desalination production quantity variation control device 150 variably controls the operation of the pretreatment process unit 120 and the reverse osmosis process unit 130 while varying the production quantity. At this time, the seawater desalination production quantity variable control device 150 varies the production quantity according to the situation in the seawater desalination system using the reverse osmosis process to operate the seawater desalination process variably.

Specifically, referring to FIG. 7, the seawater desalination production quantity variation control device 150 includes a target production quantity setting unit 151, a pretreatment production quantity calculation unit 152, a pretreatment process operation control unit 153, and a pretreatment production quantity Determination unit 154, supply pump rotation rate control unit 155, reverse osmosis process operation control unit 156, reverse osmosis production amount determination unit 157, high pressure pump pressure control unit 158 and fresh water supply control unit 159 It is composed of.

The target production quantity setting unit 151 sets a target production quantity for seawater desalination.

)에 따라 산출될 수 있다.The pre-processing amount calculation unit 152 automatically calculates the pre-processing amount to be processed by the pre-processing unit 120 . Specifically, the pre-processing amount calculated by the pre-processing amount calculation unit 152 is the amount of pre-processing process production as shown in Equation 1 below (

) can be calculated according to

[Equation 1]

는 역삼투공정 최종 생산수량(생산유량)을 나타내고,

은 역삼투공정 설정 회수율을 각각 나타낸다.here,

Represents the final production quantity (production flow rate) of the reverse osmosis process,

Represents the set recovery rate of the reverse osmosis process, respectively.

The preprocessing operation control unit 153 controls the preprocessing operation of the preprocessing unit 120 according to the preprocessing amount automatically calculated by the preprocessing amount calculation unit 152 .

The pre-processing amount determination unit 154 checks whether the pre-processing amount of the pre-processing unit 120 has reached a set value. At this time, the pre-processing amount determining unit 154 may check whether the pre-processing amount reaches a set value from the pre-processing product water flowmeter 121 installed in the pre-processing unit 120 .

The supply pump rotation speed (RPM) control unit 155 controls the number of revolutions (RPM) of the supply pump 122 installed in the pre-treatment unit 120 to control the operation of the pre-treatment process when the pre-treatment production amount does not reach a set value. ) increases. That is, when the measured value of the pre-treatment product water flowmeter 121 does not reach the set value of the pre-treatment production volume, the RPM of the supply pump 122 installed in the pre-treatment unit 120 is increased.

The reverse osmosis process operation control unit 156 controls the operation of the reverse osmosis process of the reverse osmosis process unit 130 when the amount of the pretreatment reaches a set value.

The reverse osmosis production amount determination unit 157 checks whether the reverse osmosis production amount of the reverse osmosis process unit 130 has reached a set value. At this time, the reverse osmosis production amount determination unit 157 may check whether the reverse osmosis production amount reaches a set value from the fresh water produced water flow meter 131 installed in the reverse osmosis process unit 130 .

The high-pressure pump pressure regulator 158 increases the pressure of the high-pressure pump 132 to control the operation of the reverse osmosis process when the amount of reverse osmosis production does not reach a set value. That is, when determining whether the reverse osmosis process production amount has reached the set value, the measured value of the final fresh water produced water flow meter 131 is checked, and if the production amount is insufficient, the high pressure pump 132 installed in the reverse osmosis process unit 130 increase the pressure;

The fresh water supply amount control unit 159 variably controls the fresh water supply amount when the reverse osmosis production amount reaches a set value. At this time, the fresh water supply amount controller 159 notifies the driver of the amount of fresh water produced and the amount of power used, and can change the target production amount as needed.

As a result, according to the variable production quantity seawater desalination system according to an embodiment of the present invention, the production quantity can be varied and supplied by controlling the operation of the pretreatment process and the salt osmosis process in the reverse osmosis seawater desalination system. Accordingly, In the ship-mounted desalination device currently being performed, it can be used in various ways depending on the purpose and situation in the desalination device using the reverse osmosis process as well as the ship-mounted desalination device so that the amount of fresh water produced can be adjusted as needed and supplied to island regions. .

[Variable operation method of variable production quantity seawater desalination system]

8 is an operational flow chart illustrating a variable operation method of a variable production quantity seawater desalination system according to an embodiment of the present invention.

Referring to FIG. 8 , the variable operation method of the production quantity variable seawater desalination system according to an embodiment of the present invention includes a water intake unit 110, a pretreatment unit 120, a reverse osmosis unit 130, and a post-treatment As a variable operation method of the seawater desalination system composed of the process unit 140, first, the seawater desalination production quantity variation control device 150 sets a target production quantity for seawater desalination (S110).

)인

에 의해 산출되고. 여기서,

는 역삼투공정 최종 생산수량(생산유량)을 나타내고,

은 역삼투공정 설정 회수율을 각각 나타낸다.Next, the seawater desalination production quantity variation control device 150 calculates the amount of pre-processing production to be processed in the pre-processing unit 120 (S120). At this time, the pretreatment production amount is the pretreatment process production quantity (

)person

is calculated by here,

Represents the final production quantity (production flow rate) of the reverse osmosis process,

Represents the set recovery rate of the reverse osmosis process, respectively.

Next, the seawater desalination production quantity variation control device 150 controls the operation of the pretreatment process of the pretreatment process unit 120 (S130).

Next, the seawater desalination production quantity variation control device 150 checks whether the pretreatment production quantity of the pretreatment process unit 120 has reached a set value (S140). From the pre-treatment product water flowmeter 121 installed in the pre-treatment unit 120, it may be confirmed whether the pre-treatment production amount reaches a set value.

Next, when the pretreatment amount does not reach the set value, the RPM of the supply pump 122 installed in the pretreatment unit 120 is increased to control the pretreatment operation (S150).

Next, when the pretreatment production amount reaches the set value, the seawater desalination production amount variation controller 150 controls the operation of the reverse osmosis process of the reverse osmosis unit 130 (S160).

Next, it is checked whether the reverse osmosis production amount of the reverse osmosis process unit 130 has reached a set value (S170). At this time, it may be confirmed from the fresh water production water flow meter 131 installed in the reverse osmosis process unit 130 whether the reverse osmosis production amount has reached a set value.

Next, when the reverse osmosis production amount does not reach the set value, the pressure of the high-pressure pump 132 installed in the reverse osmosis unit 130 is increased to control the operation of the reverse osmosis process (S180).

Next, when the reverse osmosis production amount reaches the set value, the seawater desalination production amount variable control device 150 variably adjusts the fresh water supply amount (S190). At this time, the amount of fresh water produced and the amount of electricity used are notified to the driver, and the target production amount is changed.

Accordingly, the seawater desalination production quantity variation control device 150 may variably control the operation of the pretreatment process unit 120 and the reverse osmosis process unit 130 while changing the production quantity.

After all, according to an embodiment of the present invention, when water resources are needed due to island regions or drought, etc., energy consumption can be reduced by supplying the water by variably adjusting the production water in the seawater desalination system.

The above description of the present invention is for illustrative purposes, and those skilled in the art can understand that it can be easily modified into other specific forms without changing the technical spirit or essential features of the present invention. will be. Therefore, the embodiments described above should be understood as illustrative in all respects and not limiting. For example, each component described as a single type may be implemented in a distributed manner, and similarly, components described as distributed may be implemented in a combined form.

The scope of the present invention is indicated by the following claims rather than the detailed description above, and all changes or modifications derived from the meaning and scope of the claims and equivalent concepts should be construed as being included in the scope of the present invention. do.

100: production quantity variable seawater desalination system
110: water intake process unit 120: pretreatment process unit
130: reverse osmosis process unit 140: post-treatment process unit
150: Seawater desalination production quantity variable control device
121: pre-treated product water flow meter 122: supply pump
131: fresh water production water flow meter 132: high pressure pump
151: target production quantity setting unit 152: pre-processing production quantity calculation unit
153: pre-treatment process operation control unit 154: pre-processing production amount determination unit
155: supply pump rotation speed control unit 156: reverse osmosis process operation control unit
157: reverse osmosis production rate determination unit 158: high pressure pump pressure control unit
159: fresh water supply control unit

Claims (15)

In the seawater desalination system using the reverse osmosis process,
A water intake process unit 110 for taking in seawater, which is raw water for seawater desalination;
A pretreatment process unit 120 having a pretreatment product water flowmeter 121 and a supply pump 122 and preprocessing and removing suspended solids, inorganic compounds, and organic contaminants that may cause contamination or damage to the reverse osmosis membrane;
A reverse osmosis process unit 130 having a fresh water production water flow meter 131 and a high pressure pump 132 and producing fresh water by removing salt from seawater introduced through the pretreatment process unit 120 using a reverse osmosis membrane;
a post-treatment unit 140 for post-processing the water desalinized by the reverse osmosis unit 130 to suit the final use; and
Seawater desalination production quantity variable control device 150 that variably controls the operation of the seawater desalination process while changing the production quantity
Including,
The seawater desalination production quantity variable control device 150 is variable operation of the pretreatment process unit 120 and the reverse osmosis process unit 130 while changing the production quantity according to the situation in the seawater desalination system using the reverse osmosis process Production quantity variation type seawater desalination system, characterized in that. The method of claim 1, wherein the seawater desalination production quantity variation control device 150,
A target production quantity setting unit 151 for setting a target production quantity for seawater desalination;
a pre-processing amount calculation unit 152 for calculating a pre-processing amount to be processed by the pre-processing unit 120;
a pre-process operation control unit 153 controlling the pre-process operation of the pre-process unit 120;
a pre-processing amount determining unit 154 that checks whether the pre-processing amount of the pre-processing unit 120 has reached a set value;
a reverse osmosis process operation control unit 156 for controlling operation of the reverse osmosis process of the reverse osmosis process unit 130 when the amount of the pretreatment amount reaches a set value;
a reverse osmosis production amount determining unit 157 that checks whether the reverse osmosis production amount of the reverse osmosis process unit 130 has reached a set value; and
When the reverse osmosis production amount reaches a set value, the production amount variable seawater desalination system including a fresh water supply amount control unit 159 for variably controlling the fresh water supply amount. According to claim 2,
The pre-processing amount calculated by the pre-processing amount calculation unit 152 is the pre-processing process production quantity (

)person

is calculated by here,

Represents the final production quantity (production flow rate) of the reverse osmosis process,

A production quantity variation type seawater desalination system, characterized in that each represents the set recovery rate of the reverse osmosis process. According to claim 2,
The pre-treatment yield determination unit 154 determines whether the pre-treatment yield has reached a set value from the pre-treatment production water flow meter 121 installed in the pre-treatment unit 120. Variable production quantity seawater desalination system. According to claim 4,
When the pretreatment production amount does not reach the set value, a feed pump rotation speed controller 155 for increasing the RPM of the feed pump 122 installed in the pretreatment process unit 120 to control the pretreatment process operation Production quantity variable seawater desalination system further comprising a. According to claim 2,
The reverse osmosis production amount determination unit 157 determines whether the reverse osmosis production amount reaches a set value from the fresh water production water flow meter 131 installed in the reverse osmosis process unit 130. system. According to claim 6,
When the reverse osmosis production amount does not reach the set value, a high-pressure pump pressure regulator 158 is added to increase the pressure of the high-pressure pump 132 installed in the reverse osmosis unit 130 to control the operation of the reverse osmosis process. Production quantity variable seawater desalination system including According to claim 2,
The fresh water supply amount controller 159 notifies the driver of the amount of fresh water produced and the amount of power used, and changes the target production amount. A variable operation method of a seawater desalination system composed of a water intake unit 110, a pretreatment unit 120, a reverse osmosis unit 130, and a post-treatment unit 140,
a) setting a target production quantity for seawater desalination by the seawater desalination production quantity variation control device 150;
b) calculating, by the seawater desalination production quantity variation type control device 150, the amount of pre-processing production to be processed in the pre-processing unit 120;
c) controlling the operation of the pretreatment process of the pretreatment process unit 120 by the seawater desalination production quantity variation control device 150;
d) checking, by the seawater desalination production quantity variation type controller 150, whether the pretreatment production quantity of the pretreatment process unit 120 has reached a set value;
e) controlling the operation of the reverse osmosis process of the reverse osmosis process unit 130 by the seawater desalination production quantity variation control device 150 when the pretreatment production amount reaches a set value;
f) checking whether the reverse osmosis production amount of the reverse osmosis process unit 130 has reached a set value; and
g) when the reverse osmosis production amount reaches a set value, including the step of variably adjusting the fresh water supply amount by the seawater desalination production amount variable control device 150,
The seawater desalination production quantity variable control device 150 is variable operation of the pretreatment process unit 120 and the reverse osmosis process unit 130 while changing the production quantity according to the situation in the seawater desalination system using the reverse osmosis process Variable operation method of the production quantity variable seawater desalination system, characterized in that. According to claim 9,
The pre-treatment production volume in step b) is the pre-treatment process production quantity (

)person

is calculated by here,

Represents the final production quantity (production flow rate) of the reverse osmosis process,

Variable operation method of the production quantity variable seawater desalination system, characterized in that each represents the set recovery rate of the reverse osmosis process. According to claim 9,
In the step d), it is characterized in that it is confirmed whether the pre-treatment production amount has reached a set value from the pre-treatment product water flow meter 121 installed in the pre-treatment process unit 120 Variable operation method of the production quantity variation type seawater desalination system. According to claim 11,
In the step d), when the pretreatment amount does not reach the set value, the pretreatment process operation is controlled by increasing the number of revolutions (RPM) of the supply pump 122 installed in the pretreatment process unit 120. Characterized in that Variable operation method of variable production quantity seawater desalination system. According to claim 9,
Variable operation method of production quantity variable seawater desalination system, characterized in that in step f), it is confirmed whether the reverse osmosis production amount has reached a set value from the fresh water production water flow meter 131 installed in the reverse osmosis process unit 130. . According to claim 13,
In step f), when the reverse osmosis production amount does not reach the set value, the reverse osmosis process operation is controlled by increasing the pressure of the high-pressure pump 132 installed in the reverse osmosis process unit 130. Variable operation method of variable quantity seawater desalination system. According to claim 9,
Variable operation method of the production quantity variable type seawater desalination system, characterized in that in step g), the freshwater production amount and the power consumption are notified to the driver and the target production amount is varied.

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