KR20150140999A - Seawater desalination-power generation system for cleaning membrane and draw solution hydraulic pump using multi-channel pressure retarded osmosis evaluating device, and method using the same - Google Patents

Abstract

The present invention relates to a seawater desalination power generation system for cleaning a separation membrane and an induction solvent pump by using a multichannel pressure delay osmosis evaluation device for seawater desalination power generation. A high-concentration induction solution pump is variably controlled according to characteristics of a separation membrane of a pressure delay osmosis membrane by using the multichannel pressure delay osmosis evaluation by considering a cake layer caused by internal and external concentration polarization and contaminants on a membrane. Therefore, efficiency of the seawater desalination power generation system can be continuously maintained. In addition, if the maximum power density of a pressure delay osmosis process to which an external concentration polarization coefficient and an internal concentration polarization coefficient are applied is lower than a set power density to which the external concentration polarization coefficient and the internal concentration polarization coefficient are not applied, the seawater desalination power generation system determines that the pressure delay osmosis membrane module needs to be cleaned and periodically cleans membrane contaminants on the surface of the separation membrane of the pressure delay osmosis membrane module and the high-concentration induction solvent pump. Accordingly, the pressure delay osmosis membrane module can recover osmosis pressure, which has been reduced by the membrane contaminants.

Description

TECHNICAL FIELD [0001] The present invention relates to a seawater desalination-power generation system for cleaning a separation membrane and an induction solvent pump using a multi-channel pressure delay osmosis evaluation device, and a seawater desalination- , AND METHOD USING THE SAME}

The present invention relates to a seawater desalination-power generation system, and more particularly, to a reverse osmosis membrane module for seawater desalination and a seawater desalination module for applying a pressure retarded osmosis module In a seawater desalination and power generation system, a seawater desalination-power generation system using a multi-channel pressure retarded osmosis evaluating device for controlling or cleaning a pressure delay osmosis process, ≪ / RTI >

In general, it is possible to generate power by generating a considerable amount of energy from the difference in salinity between seawater and fresh water. Theoretically, energy of more than 0.8 kW per ton can be extracted, Which is similar to the amount of energy generated when water falls from the dam.

The limiting factor of the energy generation technology due to this difference in salinity is the continuous supply of fresh water. Theoretically, assuming that the river flows into the sea globally, it can generate about 2 terawatt (Terawatt) It is known that about 980 gigawatt of water can be used and that it is possible to generate a salinity difference of about 18 gigawatts, assuming that the wastewater is discharged to the sea.

As a result, about 800 gigawatts of electricity is produced from hydroelectric power generation worldwide, the energy of salinity difference can be regarded as an infinite energy source. Typical salinity-gradient energy generation technologies include pressure retarded osmosis (PRO) and reverse electrodialysis (RED) processes.

In particular, this pressure-delayed osmosis process can be said to be the development using the difference in salinity between the two solutions having different salinity concentrations. By arranging the semipermeable membrane (membrane) between the low-concentration influent and the high- It is similar to the basic principle of Forward osmosis (FO) that can obtain water and electric power together.

Specifically, in this pressure-delayed osmosis process, fresh water is used as the low concentration solution and sea water is used as the high concentration solution. The low concentration solution that has undergone the pretreatment process is permeated into the high concentration solution through the semi-permeable membrane due to the osmotic pressure difference, and correspondingly increased flow can produce energy by rotating the turbine. That is, in the pressure delay osmosis process, the osmotic pressure generated by the difference in concentration between the two solutions changes to the hydraulic type, and the hydraulic pressure rotates the turbine to obtain energy.

Therefore, this pressure-delayed osmosis process can be regarded as a stable eco-friendly technology because it has less change factors for seawater and river, which are source resources than alternative power generation alternative energy sources.

On the other hand, the basic concept of conventional membrane separation is to separate materials by allowing selective permeation. For example, it is possible to perform a process by pressure such as ultrafiltration (UF), microfiltration (MF) , Some of the solvent in the solute passes through the membrane, but most of the solvent is present in the solution. In this case, the solvent is accumulated on the surface of the separator, so that the concentration of the solvent gradually increases, and the diffusion occurs in a direction opposite to the film surface due to the property of diffusing from a high concentration to a low concentration. Ultimately, the convection velocity in the direction of the membrane surface becomes a concentration gradient in the membrane surface boundary layer due to the mass balance equations between the diffusion flux in the opposite direction of the membrane surface and the permeated solvent.

In addition, in the case of a high molecular weight polymer, a gel layer composed of many high molecular materials is formed on the surface of the membrane while maintaining a high concentration on the surface of the membrane. Such a gel layer has a molecular size, shape, And is independent of solution concentration.

Also, the flow rate through the membrane increases with the pressure until it becomes equal to the concentration forming the gel layer. At this time, even if the pressure increases more, the concentration of the membrane surface becomes longer Do not increase. As a result, the layer becomes thicker and thicker, becoming a major factor in determining the flow rate.

On the other hand, since the membrane used in the reverse osmosis (RO) process is typically an asymmetric structure composed of a thin active layer and a porous support layer, the external concentration polarization occurs in the active layer and the internal concentration polarization occurs in the porous support layer Occurs.

In the separation membrane used in the pressure delay osmosis (PRO) process, the active layer is formed adjacent to the draw solution, and the porous support layer is formed in contact with the feed solution (see FIG. 6). Such a membrane shape is necessary to reliably maintain the hydraulic pressure applied on the induction solution side.

Concentration polarization can be classified into external concentration polarization and internal concentration polarization depending on the position where the concentration polarization occurs.

The external concentration polarization is a phenomenon occurring in the separator active layer and the influent or induction solution. The active concentration layer is brought into contact with the induction solution according to the installation position of the separation membrane, and the porous support layer Dilutive external concentration polarization and Concentrative external concentration polarization in which the active layer is brought into contact with an influent and the porous support layer is brought into contact with an inducing solution can be categorized. At this time, in the pressure delay osmosis (PRO) process, dilution external concentration polarization occurs due to the arrangement characteristics of the separation membrane.

6, dilution external concentration polarization is similar to concentration external concentration polarization, but concentrated external concentration polarization increases the concentration of solute in the surface of the separation membrane which is in contact with the influent water due to the permeation flux, On the other hand, the dilute external concentration polarization occurs between the inducing solution and the active layer, and the concentration of the inductive solution on the surface of the active layer is lowered by the permeation flux passing through the separation membrane, and the osmotic pressure at the front and rear ends of the separation membrane decreases Phenomenon.

On the other hand, the internal concentration polarization is a phenomenon occurring in the porous support layer and the influent or induction solution. The internal concentration polarization can be classified into concentration concentration concentration polarization and dilution concentration concentration polarization depending on the installation position of the separation membrane.

Specifically, as shown in FIG. 6, the concentrated internal concentration polarization is obtained by bringing the active layer into contact with the inductive solution and bringing the porous support layer into contact with the influent water so that the influent water is introduced into the porous support layer by diffusion, The permeation flux is generated by the osmotic pressure difference. At this time, since the solvent permeates the separation membrane but the solute does not permeate, the concentration of the solute in the porous support layer continuously increases, so that the difference in the effective osmotic pressure between the front and rear ends of the separation membrane decreases and the permeation flux decreases.

In addition, the cake layer formed by membrane contaminants such as particulate matter and organic matter in the solvent on the low concentration side forms an additional filtration resistance layer by the CEOP (Cake Enhanced Osmotic Pressure) phenomenon which further increases the filtration resistance of the separation membrane, The concentration of solvent at the high concentration, which produces the maximum power density calculated by the concentration of the solvent at the high concentration side, occurs. As a result, in addition to the external concentration polarization and the internal concentration polarization, flux and power density And will continue to change.

FIG. 1 is a diagram illustrating a seawater desalination-power generation system in which a reverse osmosis membrane module and a pressure-delayed osmosis membrane module according to the related art are combined.

1, a conventional seawater desalination-power generation system including a reverse osmosis membrane module and a pressure-delayed osmosis membrane module includes an influent storage tank 110, a high-pressure pump 120, a booster pump 130, a reverse osmosis membrane module A low concentration inflow water reservoir 170, a low concentration inflow water pipe 171, a high concentration induction solvent pump 180, a high concentration induction solvent inflow pipe 181, A permeable water reservoir 220, a second energy recovery device 230, and a draining water reservoir 240. The osmosis membrane module 190 includes a pressure-sensitive osmosis membrane module 190, a permeable water storage tank 220,

In this pressure-delayed osmosis process, in the state of not taking into account the membrane resistance of the CEOP side due to membrane contamination as well as the external concentration polarization and internal concentration polarization described above, the half value of the concentration of the high concentration solvent side of the pressure- Or the fixed operation pressure, the energy saving effect by the actual pressure delay osmosis process is canceled, and the process is not efficiently operated due to the problem that the pressure is exceeded.

Accordingly, when designing and operating various combinations of pressure-delayed osmosis processes, a technique for controlling the high concentration solvent pump 180, as shown by reference A, is required in view of concentration polarization and membrane contamination And a cleaning technique that is suitable for a pressure delayed osmosis process characteristic capable of reducing concentration polarization at both ends of the active layer and the support layer in the separation membrane of the pressure delay osmosis membrane module 190 is required when actual membrane contamination occurs.

In other words, according to the seawater desalination-power generation system in which the reverse osmosis membrane module and the pressure-delayed osmosis membrane module according to the related art are combined, the osmotic pressure resistance caused by the internal concentration polarization, the external concentration polarization, (See FIG. 7), which reduces the power density that can be produced in the pressure-delayed osmosis process, thereby increasing the efficiency of the entire seawater desalination-power generation system efficiency There is a problem in that it is dropped.

Korean Patent No. 10-1200838 filed on July 14, 2010, entitled "Apparatus and Method for Desalination of Osmotic Power and Sea Water Using Salinity Difference" Korean Patent No. 10-987294 filed on Mar. 16, 2010, entitled "Osmotic Reverse Cleaning Method of High Pressure Membrane Filtration Process and High Pressure Membrane Filtration Device Using It, Korean Patent Laid-Open Publication No. 2013-0125446 (published on Nov. 19, 2013), entitled "Device for Purifying Water Combined with Pressure Delayed Membrane Distillation" Korean Patent No. 10-1268936 filed on May 3, 2011, entitled "WATER AND ENERGY PRODUCTION APPARATUS AND METHODS FROM SEAWATER USING STRESS OXIDATION AND PRESSURE DELAYED OXIDATION AND MEMBRANE DISPERSION PROCESS" Korean Patent No. 10-1397296 filed on Dec. 27, 2013, entitled "Porous effluent pipe for positive osmosis or pressure delay osmosis and positive osmosis or pressure delayed osmosis module comprising the same, Korean Patent No. 10-1372901 filed on December 20, 2006, entitled "Method and System for Performing Maintenance on a Membrane Used for Pressure Delay Osmosis

In order to solve the above problems, the present invention provides a seawater desalination-power generation system using a reverse osmosis membrane module and a pressure-delayed osmosis membrane module for seawater desalination- Channel pressure delay osmosis evaluation device considering multi-channel pressure delay osmotic pressure, taking into consideration the cake layer caused by the pressure loss, And to provide a desalination desalination-power generation system and method thereof for cleaning an induction solvent pump.

Another object of the present invention is to provide a method of measuring the maximum concentration of electric power in a pressure delay osmosis process that takes into account external concentration polarization coefficient and internal concentration polarization factor based on data measured by a multi- If it is determined that the pressure delayed osmosis membrane module needs to be cleaned, it is necessary to clean the membrane surface of the pressure-sensitive osmosis membrane module and the membrane contaminants of the high concentration induction solvent pump periodically, A seawater desalination-power generation system and method for cleaning a membrane and an induction solvent pump using a multi-channel pressure delay osmotic evaluation device capable of recovering a reduced effective osmotic pressure due to membrane contaminants .

As a means for achieving the above technical object, a seawater desalination-power generation system for cleaning a separation membrane and an induction solvent pump using a multi-channel pressure delay osmosis evaluation apparatus according to the present invention comprises a reverse osmosis membrane module for desalination of seawater, A low concentration inflow water reservoir storing surface water or sewage effluent used as a low concentration inflow water; A pressure delayed osmosis membrane module connected to the high concentration induction solvent inflow pipe so that the reverse osmosis concentrated water discharged from the RO membrane module is introduced into the pressure delayed osmosis membrane; Concentration osmotic membrane module, and one sampling pipe connected to one side of the high-concentration induction solvent inflow pipe upstream of the pressure-delayed osmosis membrane module and one side of the low-concentration inflow water pipe connected to the low-concentration inflow water reservoir, Multi-channel pressure-delayed osmotic evaluation device for evaluating multi-channel pressure delay osmosis for evaluating flux and membrane fouling; Based on the data evaluated by the multi-channel pressure delay osmosis evaluation device, the influent flow rate of the samples taken from the high concentration solvent-introduced pipeline and the low-concentration influent pipeline, and the concentration data of TDS (total dissolved solids) A pressure delayed osmosis process control unit for controlling the pressure delay osmosis membrane module by calculating a maximum power density in consideration of an external concentration polarization coefficient; And an operation pressure for maintaining the maximum power density calculated by the pressure delayed osmosis process control unit is feedbacked to a high concentration induction solvent pump installed on the high concentration induction solvent inflow pipe and the maximum power density is set to be lower than a set power density And a cleansing decision controller for determining to perform physical cleansing of the high concentration induction solvent pump and the pressure delayed osmosis membrane module separator when they are maintained.

Here, the multi-channel pressure delay osmosis evaluation device is composed of three cells. The osmotic pressure of the high-concentration-induced solvent concentration is divided into three equal parts, and the high-concentration induction solvent and the low- It can be evaluated experimentally.

Here, the pressure-delayed osmosis process control unit calculates a power density in consideration of an internal concentration polarization coefficient and an external concentration polarization coefficient through a numerical analysis operation, generates a power density function curve, and calculates an operation pressure to maintain a maximum power density , And the operation pressure of the high concentration induction solvent pump installed on the high concentration induction solvent inflow pipe at the upstream side of the pressure delay osmosis membrane module is feedback-controlled.

Here, the pressure delayed osmosis process control unit may collect data on TDS and flow rate of each of the high concentration induction solvent and the low concentration influent water, and data on flux and membrane contamination of each pressure calculated by the multi-channel pressure delay osmosis evaluation device ; The data collecting unit receives the data of the TDS and the flow rate of each of the high concentration induction solvent and the low concentration influent and the data of the flux and the membrane contamination by the pressure and calculates the power density considering the internal concentration polarization factor and the external concentration polarization factor A model predictive controller for determining operating pressure, power density, and system energy of the pressure-delayed osmosis membrane module; And a feedback controller for calculating an error of the operating pressure according to a numerical analysis result of the model predictive controller and performing a feedback calculation according to the calculated error of the operating pressure and inputting the feedback error to the model predictive controller.

Here, the feedback control unit includes an operation pressure error calculation unit for calculating an error of the operation pressure calculated by the second numerical analysis operation unit of the model prediction control unit; And a feedback calculator for performing a feedback calculation according to the calculated error of the operating pressure and inputting the calculated feedback to the model input unit of the model predictive controller.

Here, the cleaning decision-making control unit feedback-controls an operation pressure that maintains the maximum power density finally calculated in the multi-channel pressure delay osmosis evaluating device and the pressure delay osmosis process control unit, so that the calculated maximum power density is set A power density error calculator for determining whether the power density is smaller than the power density; And when the calculated maximum power density is smaller than a set power density, determining to physically clean the active layer and the supporting layer of the pressure-delayed osmosis membrane module using the final treated water of the reverse osmosis membrane module as a washing water, And the washing pump controller may determine whether to perform cleaning at a flow rate higher than the normal flow velocity of the high-concentration induction solvent under the normal operating condition of the pressure-delayed osmosis membrane module.

Here, the reverse osmosis concentrated water supplied from the reverse osmosis membrane module performs physical cleaning of the high concentration solvent pump, and the final treated water of the reverse osmosis membrane module is supplied through the membrane cleansing water line, .

In another aspect of the present invention, there is provided a method of cleaning a separation membrane and an induction solvent pump using a multichannel pressure delay osmosis evaluation apparatus according to the present invention includes applying a reverse osmosis membrane module for seawater desalination, A method for cleaning a membrane and an induction solvent pump of a pressure-delayed osmosis membrane module of a seawater desalination-power generation system employing a pressure-delayed osmosis membrane module, the method comprising the steps of: a) determining a TDS and a flow rate of a high concentration induction solvent and low- ; b) evaluating flux-per-pressure flux and membrane fouling by the multi-channel pressure delay osmotic evaluation device; c) calculating the flux density and the power density without considering the internal concentration polarization factor and the external concentration polarization factor, and setting the flux density and the power density as the set power density; d) calculating an internal concentration polarization factor and an external concentration polarization factor of the pressure delay osmotic membrane module separator; e) generating a power density curve for each operating pressure by considering the internal concentration polarization factor and the external concentration polarization factor, deriving the maximum power density and operating pressure according to the numerical analysis model from the power density curve for each operating pressure; f) calculating energy consumption of the entire system based on the maximum power density of the operating pressure condition; And g) physically cleaning the separation membrane of the pressure delay osmosis membrane module and the high concentration solvent pump when the derived maximum power density is less than the set power density.

A method for cleaning a separation membrane and an induction solvent pump using a multichannel pressure delayed osmosis evaluation apparatus according to the present invention comprises the steps of: h) if the derived maximum power density is not less than a set power density, And performing osmotic power generation by controlling an operation pressure of the pressure-delayed osmosis membrane module.

The multichannel pressure-delayed osmotic pressure evaluation device of the step b) is composed of three cells. The osmotic pressure of the high-concentration-induced-solvent concentration is divided into three equal parts, and the high-concentration induction solvent And the low-concentration influent water can be experimentally evaluated.

로 주어지고, 여기서,

는 분리막의 물 여과계수를 나타내고,

는 반사계수를 나타내며,

는 분리막의 삼투압 차이를 나타내고,

는 운전압력을 나타내며, 상기 c) 단계의 전력밀도(

)는

로 주어지는 것을 특징으로 한다.Here, the flux of step c)

Lt; / RTI >

Represents the water filtration coefficient of the separation membrane,

Represents a reflection coefficient,

Represents the osmotic pressure difference of the separation membrane,

Represents the operating pressure, and the power density in step c)

)

.

)로서, Here, the flux in the step d) may be determined by taking into account both the dilution external concentration polarization and the concentration concentration concentration polarization,

)as,

로 주어지고, 여기서,

는 압력지연 삼투막 모듈 분리막의 물 여과계수를 나타내고,

는 분리막 표면에서의 유도용액 삼투압을 나타내며,

는 분리막 전체의 유도용액 삼투압을 나타내고,

는 염 여과계수를 나타내고,

는 물질전달계수를 나타내며,

는 용질 비저항을 나타내고,

는 벌크 삼투압을 나타내고,

는 운전압력을 나타내며, 상기 d) 단계의 플럭스(

)를 고려한 전력밀도(

)는,

Lt; / RTI >

Represents the water filtration coefficient of the pressure-delayed osmosis membrane module membrane,

Represents the induced solution osmotic pressure at the membrane surface,

Represents the inductive solution osmotic pressure of the entire membrane,

Represents the salt filtration coefficient,

≪ / RTI > represents the mass transfer coefficient,

Represents a solute resistivity,

Lt; / RTI > represents the bulk osmotic pressure,

Represents the operating pressure, and the flux (d)

) Power density (

),

로 주어지는 것을 특징으로 한다.

.

Here, the power density curve calculated by the numerical analysis model in the step (e) is represented by a quadratic function formula. By this numerical analysis, the value of the tangent slope at which the slope of the tangent line becomes "0 & And the operating pressure for maintaining the maximum power density is calculated by the numerical analysis model.

Here, the reverse osmosis concentrated water supplied from the reverse osmosis membrane module in the step g) performs physical cleaning of the high concentration solvent pump, and the final treatment water of the reverse osmosis membrane module is supplied through the membrane cleansing water line, And the separator is washed.

According to the present invention, in a seawater desalination-power generation system employing a reverse osmosis membrane module and a pressure-delayed osmosis membrane module for seawater desalination-power generation, a multi-channel pressure delay considering a cake layer due to internal and external concentration polarization, By using the osmotic evaluation device, the efficiency of the seawater desalination-power generation system can be continuously maintained by variably controlling the high concentration induction solution pump according to the characteristics of the membrane of the pressure delay osmosis membrane module.

According to the present invention, the maximum power density of the pressure-delayed osmosis process taking into account the external concentration polarization factor and the internal concentration polarization factor based on the data measured by the multi-channel pressure delay osmosis evaluation device takes into consideration the external concentration polarization factor and the internal concentration polarization factor If it is determined that the pressure delayed osmosis membrane module needs to be cleaned, the surface of the separation membrane of the pressure-delayed osmosis membrane module and the membrane contaminants of the high-concentration induction solvent pump are periodically cleaned, Reduced effective osmotic pressure due to contaminants can be restored. Accordingly, the performance of the pressure delay osmosis process is continuously maintained by cleaning the separation membrane of the pressure-delayed osmosis membrane module and the high-concentration induction solvent pump, respectively, considering the membrane fouling characteristics such as concentration polarization inside and outside of the pressure- .

According to the present invention, since energy is obtained from the reverse osmosis concentrated water of the reverse osmosis process which may cause a serious problem in the marine environment and is discharged at a concentration similar to seawater, it is not necessary to install a separate concentrated water treatment facility, Friendly seawater desalination system.

FIG. 1 is a diagram illustrating a seawater desalination-power generation system in which a reverse osmosis membrane module and a pressure-delayed osmosis membrane module according to the related art are combined.
2 is a schematic view for explaining a seawater desalination-power generation system for cleaning a separation membrane and an induction solvent pump using a multi-channel pressure delay osmosis evaluation apparatus according to an embodiment of the present invention.
3 is a specific configuration diagram of a seawater desalination-power generation system for cleaning a separation membrane and an induction solvent pump using a multi-channel pressure delay osmosis evaluation apparatus according to an embodiment of the present invention.
FIG. 4 is a diagram illustrating a configuration of a pressure-delayed osmosis process control unit and a cleaning decision-making control unit in a seawater desalination-power generation system for cleaning a separation membrane and an induction solvent pump using a multi-channel pressure delay osmosis evaluation apparatus according to an embodiment of the present invention .
5 is a flowchart illustrating a method of cleaning a separation membrane and an induction solvent pump of a pressure-delayed osmosis membrane module using a multi-channel pressure delay osmosis evaluation apparatus according to an embodiment of the present invention.
6 is a diagram showing that a cake layer is formed on the support layer of the pressure-delayed osmosis membrane module by internal concentration polarization and external concentration polarization by the particulate matter and organic matter in the separation membrane of the pressure-delayed osmosis membrane module.
7 is a graph showing that the effective osmotic pressure decreases due to the internal concentration polarization and the external concentration polarization of the pressure delay osmosis process due to the mass transfer in the separation membrane of the pressure-delayed osmosis membrane module.
FIG. 8 is a graph showing the results obtained by using a multichannel pressure delay osmosis evaluation device in a seawater desalination-power generation system for cleaning a membrane and an induction solvent pump using a multi-channel pressure delay osmosis evaluation device according to an embodiment of the present invention. Delayed osmosis process control unit for performing an analysis operation is implemented by a program.
FIGS. 9A and 9B are graphs showing the relationship between the concentrations of the high-concentration induction solvent and the high-concentration induction solvent in the seawater desalination-power generation system for cleaning the separator and the induction solvent pump using the multi- FIG. 5 is a graph showing the relationship between pressure and power density. FIG.
FIG. 10 is a graph showing the relationship between the physical properties of the membranes and the physical properties of the membranes of the pressure-sensitive osmosis membrane module in a seawater desalination-power generation system for cleaning a membrane and an induction solvent pump using a multi- Fig.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings, which will be readily apparent to those skilled in the art. The present invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. In order to clearly illustrate the present invention, parts not related to the description are omitted, and similar parts are denoted by like reference characters throughout the specification.

Throughout the specification, when an element is referred to as "comprising ", it means that it can include other elements as well, without excluding other elements unless specifically stated otherwise. Also, the term "part" or the like, as described in the specification, means a unit for processing at least one function or operation, and may be implemented by hardware, software, or a combination of hardware and software.

[Seawater Desalination-Power Generation System for Cleaning Membrane and Induction Solvent Pump Using Multi-Channel Pressure Delay Osmosis Evaluation System]

2 is a schematic view for explaining a seawater desalination-power generation system for cleaning a separation membrane and an induction solvent pump using a multi-channel pressure delay osmosis evaluation apparatus according to an embodiment of the present invention.

2, a seawater desalination-power generation system for cleaning a separation membrane and an induction solvent pump using a multi-channel pressure delay osmosis evaluation apparatus according to an embodiment of the present invention includes a reverse osmosis membrane module 140 for desalination of seawater, Channel pressure delay osmosis evaluation device 300 in a seawater desalination-power generation system in which a pressure-delayed osmosis membrane module 190 for a model-based pressure delayed osmosis membrane module 190 with a pressure- Is controlled and cleaned.

6, when the solvent on the low concentration side and the solvent on the high concentration side pass through the separation membrane of the pressure delay osmosis membrane module 190, the internal concentration polarization And an external concentration polarization phenomenon occurs. At the same time, an additional filtration resistance layer is formed by the CEOP (Cake Enhanced Osmotic Pressure) phenomenon due to the membrane contaminants such as particulate matter and organic matter in the solvent on the low concentration side, The high-concentration solvent-side hydraulic pressure produces a maximum power density calculated by the concentration of the solvent.

In the case of a seawater desalination-power generation system for cleaning a separation membrane and an induction solvent pump using a multi-channel pressure delay osmosis evaluation apparatus according to an embodiment of the present invention, a multi-channel system comprising a plurality of cells The hydraulic pressure based on the experimental measurement value rather than the theoretical value is calculated using the pressure delay osmosis evaluation device 300 and compared with the set model value. When the pressure is within the tolerance range, the induction solvent pump control value , Which can be used as a process index for the entire seawater desalination-power generation system by calculating the energy savings of the entire seawater desalination-power generation system by calculating the available flux and power density.

Further, when the process index derived by the multi-channel pressure delay osmotic pressure evaluation device 300 is out of the set model value and the tolerance range, the separation membrane of the pressure delay osmosis membrane module 190 is physically cleaned to remove contaminants .

Channel pressure delay osmosis evaluating device 140 is connected to one side of the high concentration induction solvent inflow pipe 181 and the low concentration inflow pipe 171 provided at the front end of the pressure delay osmosis membrane module 190, Channel pressure delayed osmosis analyzer 300 and the pressure of the high concentration induction solvent is varied for each of the cells 310, 320 and 330 of the multi-channel pressure delayed osmosis analyzer 300, Flux is measured and processed as an input value of an internal numerical model of the pressure delay osmosis process control unit 400 to calculate the operating pressure of the high concentration induction solvent pump 180 that maintains the maximum power density of the pressure delay osmosis process And thus the efficiency of the seawater desalination-power generation system can be maintained constantly.

FIG. 3 is a specific configuration diagram of a seawater desalination-power generation system for cleaning a separation membrane and an induction solvent pump using a multi-channel pressure delay osmosis evaluation apparatus according to an embodiment of the present invention. FIG. 2 is a configuration diagram specifically illustrating a pressure delayed osmosis process control unit and a cleaning decision control unit in a seawater desalination-power generation system for cleaning a separation membrane and an induction solvent pump using a multi-channel pressure delay osmosis evaluation apparatus according to the present invention.

3 and 4, a seawater desalination-power generation system for cleaning a separation membrane and an induction solvent pump using a multi-channel pressure delay osmosis evaluation apparatus according to an embodiment of the present invention includes a reverse osmosis membrane A reverse osmosis module and a pressure retarded osmosis module for power generation is applied to the seawater desalination-power generation system. The desalination desalination is performed by the reverse osmosis membrane module 140 , And osmotic power generation is performed by the pressure delay osmosis membrane module (190).

3 and 4, a seawater desalination-power generation system for cleaning a separation membrane and an induction solvent pump using a multi-channel pressure delay osmosis evaluation apparatus according to an embodiment of the present invention includes an inlet water storage tank The first energy recovery unit 160, the low concentration inflow water storage unit 170, the low concentration inflow water pipe 171 The high concentration induction solvent inflow pipe 181, the pressure delay osmosis membrane module 190, the washing water line 210, the permeate storage tank 220, the second energy recovery device 230, A drainage reservoir 240, a multi-channel pressure delay osmosis evaluation device 300, a pressure delayed osmosis process control unit 400 and a cleansing decision control unit 500. 4, the pressure-delayed osmosis process control unit 400 includes a data collection unit 410, a model prediction control unit 420, and a feedback control unit 430, and the model prediction control unit 420 And a model output unit 424. The feedback control unit 430 includes an operation pressure error calculation unit 431 and an operation pressure error calculation unit 432. The model input unit 421, the first numerical analysis operation unit 422, the second numerical analysis operation unit 423, And a feedback calculator 432. The cleansing decision controller 500 includes a power density error calculator 510 and a cleansing determination and a cleansing pump controller 520. The cleansing decision controller 500 determines whether the pressure- May be implemented in the control unit 400.

A first energy recovery device 160 and a booster pump 130 for recovering the energy of the high pressure pump 120 and the reverse osmosis concentrated water are basically provided at the front end of the reverse osmosis membrane module 140, The reverse osmosis membrane module 140 is connected to the low-concentration inflow water pipe 171 through which low-concentration inflow water is supplied as surface water or sewage effluent based on the osmosis membrane module 190, The high concentration induction solvent pump 180 is formed on the high concentration induction solvent inflow pipe 181 and the concentrated water of the separation membrane of the pressure delay osmosis membrane module 190 is reused by the second energy recovery device 230 .

The high concentration induction solvent pump 180 installed on the high concentration induction solvent infusion pipe 181 is connected to the high concentration induction solvent infusion pipe 180 through the multi channel FEED device 300 and the pressure delayed osmosis process control unit 400, Can be controlled by calculating the operating pressure at which the density can be obtained.

At this time, when the operation pressure for maintaining the maximum power density calculated through the multi-channel pressure delay osmosis evaluation apparatus 300 and the pressure delayed osmosis process control unit 400 is smaller than the set operation pressure, for example, 15% , It is determined that the membrane contamination of the separation membrane of the pressure-delayed osmosis membrane module 190 is accelerating and physical washing is performed along the separation membrane washing water line 210 with the final treated water of the reverse osmosis membrane module 140 .

The inflow water, for example, seawater stored in the inflow water storage tank 110 is supplied to the reverse osmosis membrane module 140 through the high pressure pump 120, is desalinated by the reverse osmosis membrane module 140, ).

The reverse osmosis membrane module 140 performs seawater desalination processing on the influent water (seawater) stored in the influent storage tank 110. That is, the influent water (sea water) is treated as the final treated water through the reverse osmosis membrane module 140.

The effluent storage tank 240 recovers and discharges the discharged water of the pressure-delayed osmosis membrane module 190. At this time, since the reverse osmosis concentrated water has a concentration in the range of the incoming seawater, it can be discharged to the sea without treatment of concentrated water.

The low-concentration influent storage tank 170 stores surface water or sewage effluent used as a low-concentration influent.

The pressure delayed osmosis membrane module 190 is connected to the high concentration induction solvent inflow pipe 181 so that the reverse osmosis concentrated water discharged from the reverse osmosis membrane module 140 flows into the pressure delayed osmosis membrane.

The multichannel pressure delay osmosis evaluation apparatus 300 is disposed at one side of the high concentration induction solvent inflow pipe 181 at the upstream side of the pressure delay osmosis membrane module 190 and at one side of the low concentration inflow water pipe 171 connected to the low concentration inflow water reservoir 170 A continuous sample is taken through each connected sampling pipe to evaluate multi-channel pressure delay osmosis to assess flux-per-pressure and membrane fouling of the pressure-delayed osmosis membrane module 190. In this case, the multi-channel pressure delay osmosis analyzer 300 includes three cells 310, 320, and 330, and the osmotic pressure of the high concentration solvent concentration is measured for each cell 310, 320, The flux and membrane contamination can be measured and evaluated experimentally at different operating pressures. For example, the multi-channel pressure delay osmosis evaluation apparatus 300 is composed of separation membranes of different evaluation cells 310, 320, and 330, respectively. The three pumps are operated at 10 bar, 20 bar, and 30 bar It is possible to apply the operating pressure to the evaluation cells 310, 320 and 330 by operating differently.

The pressure-delayed osmosis process control unit 400 receives the data evaluated by the multi-channel pressure-delayed osmotic pressure evaluation apparatus 300, the influx of the sample collected from the high concentration solvent-introduced inflow pipe 181 and the low-concentration inflow pipe 171 Based on the concentration data of the flow rate and TDS (total dissolved solids), the pressure delay osmosis membrane module 190 is controlled by calculating the maximum power density in consideration of the internal concentration polarization factor and the external concentration polarization factor. Here, the pressure-delayed osmosis process control unit 400 calculates a power density in consideration of an internal concentration polarization coefficient and an external concentration polarization coefficient through a numerical analysis operation, generates a power density function curve, And the operation pressure of the high-concentration induction solvent pump 180 provided on the high-concentration induction solvent inflow pipe 181 at the upstream side of the pressure-delayed osmosis membrane module 190 can be feedback-controlled.

Specifically, the data collection unit 410 of the pressure-delayed osmotic process control unit 400 calculates the TDS (total dissolved solids) and the flow rate of each of the high concentration induction solvent and the low concentration influent water, And collects data on the flux and membrane contamination by pressure calculated in the apparatus 300. [ That is, the data collecting unit 210 collectively stores the total dissolved solids (TDS) installed in the sampling pipe connected to the low-concentration inlet pipe 171 and the sampling pipe connected to the high-concentration induction solvent pipe 181, Data on the TDS and flow rate of the high concentration induction solvent, and fluxes per operation pressure evaluated in the multi-channel pressure delay osmosis evaluation apparatus 300 are collected as data. Here, the low-concentration influent water may be surface water or sewage effluent.

The model predictive controller 420 of the pressure-delayed osmotic process control unit 400 calculates the TDS (total dissolved solids) and the flow rate of each of the high concentration induction solvent and the low concentration influent water from the data collection unit 410, Flux and membrane contamination, calculates the power density taking into account the internal concentration polarization factor and the external concentration polarization factor, and determines the operating pressure, power density, and system energy of the pressure-delayed osmosis membrane module 190. That is, the data collected by the data collecting unit 410 is input to the model predicting unit 421 of the model predicting and controlling unit 420, and the first and second numerical analysis computing units 422 , 423) to calculate the power density considering the internal concentration polarization factor and the external concentration polarization factor based on the finally measured flux based on the numerical analysis operation over the second time to calculate the energy of the entire seawater desalination- The efficiency is evaluated. The model output unit 424 of the model predictive controller 420 calculates the maximum operating pressure at which the maximum power density can be obtained and compares the maximum operating pressure with the set operating pressure to determine the maximum operating pressure at which the high concentration induction solvent The operation pressure of the high concentration solvent pump 180 installed in the inlet pipe 181 is feedback-controlled.

The feedback controller 430 of the pressure-delayed osmosis process control unit 400 calculates an error of the operation pressure according to a numerical analysis result of the model predictive controller 420 and performs a feedback operation according to the calculated error of the operation pressure Is input to the model predictive controller 420 and corrected. Specifically, the feedback control unit 430 includes an operation pressure error calculation unit 431 for calculating an error of the operation pressure calculated by the second numerical analysis operation unit 423 of the model predictive control unit 420; And a feedback calculator 432 for performing a feedback calculation according to the calculated error of the operating pressure and inputting the calculated feedback to the model input unit of the model predictive controller.

4, the cleansing decision control unit 500 calculates an operation pressure for maintaining the maximum power density calculated by the pressure-delayed osmosis process control unit 400 and outputs the operation pressure to the high-concentration-inducing solvent inflow pipe 181 The high concentration induction solvent pump 180 is feedback-controlled. When the maximum power density is maintained below the set power density, the high concentration induction solvent pump 180 and the pressure delay osmosis membrane module 190 are physically cleaned .

The power density error calculator 510 of the cleansing decision controller 500 calculates the maximum density of the ultimate power calculated in the multi-channel pressure delay osmosis evaluating device 300 and the pressure delayed osmosis process control unit 400, Feedback control of the operating pressure to maintain the density is performed to determine whether the calculated maximum power density is less than the set power density. When the calculated maximum power density is less than the preset power density, the final decision on whether the cleaning decision-making controller 500 is to be cleaned and the cleaning-pump controller 520 determines whether the final treated water of the reverse osmosis membrane module 140 is a cleaning water Wherein the flow rate of the rinse water is determined based on the flow rate of the high concentration solvent at a normal operating condition of the pressure-delayed osmosis membrane module (190) At a higher flow rate. At this time, the reverse osmosis concentrated water supplied from the reverse osmosis membrane module 140 performs physical cleaning of the high concentration induction solvent pump 180, and the final treated water of the reverse osmosis membrane module 140 is supplied to the separation membrane cleaner water line 210 So that the separation membrane of the pressure delay osmosis membrane module 190 can be cleaned.

[Method for Cleaning Membrane and Induction Solvent Pump of Pressure Delayed Osmosis Membrane Module Using Multichannel Pressure Delay Osmosis Evaluation Device]

FIG. 5 is a flowchart illustrating a method of cleaning a separation membrane and an induction solvent pump of a pressure-delayed osmosis membrane module using a multi-channel pressure delay osmosis evaluation apparatus according to an embodiment of the present invention. And the pressure-delayed osmosis process control unit 400 to control the pressure-delayed osmosis process.

Referring to FIG. 5, a method of cleaning a separation membrane and an induction solvent pump of a pressure-delayed osmosis membrane module using a multi-channel pressure delay osmosis evaluation apparatus according to an embodiment of the present invention includes firstly a high concentration induction solvent inflow pipe 181, (TDS) and flow rate of the high concentration induction solvent and the low concentration influent water are measured through the sampling pipe connected to the low concentration inlet pipe 171 and the sampling pipe connected to the low concentration inlet pipe 171, respectively (S101). Here, the TDS and the flow rate can be measured through a separately installed meter (not shown).

Next, a multichannel pressure delayed osmosis evaluation device 300 connected to the sampling pipe evaluates flux and membrane contamination by pressure according to TDS (total dissolved capacity) and flow rate of the high concentration induction solvent and low concentration influent water (S102). The multi-channel pressure-delayed osmotic pressure evaluation apparatus 300 includes a plurality of cells, for example, three cells 310, 320, and 330, and the high concentration induction solvent The operating pressure can be divided into three equal parts based on the osmotic pressure of the concentration, and the high concentration induction solvent and the low concentration influent water can be experimentally evaluated at different operating pressures.

Next, the flux density and the power density without considering the internal concentration polarization factor and the external concentration polarization factor are calculated according to the following equations (1) and (2) and set to the set power density (S103). That is, flux and power density can be calculated using Equation 1 and Equation 2 using TDS and flow rate of each of the high concentration induction solvent and low concentration influent water as data.

: Water flux)는 다음과 같이 수학식 1에 의해 구할 수 있다.Equation (1) represents a basic equation for calculating the flux of the pressure delay osmosis technique, and Equation (2) is a mathematical expression for calculating the power density by the pressure delay osmosis technique. In other words, the flux concentration without considering the internal concentration polarization factor and the external concentration polarization factor

: Water flux) can be obtained by the following equation (1).

는 분리막의 물 여과계수(Permeability constant)를 나타내고,

는 반사계수(Reflection coefficient)를 나타내며,

는 분리막의 삼투압 차이(Osmotic pressure differential across the membrane)를 나타내고,

는 운전압력(Applied pressure)을 나타낸다.here,

Represents the water permeability constant of the membrane,

Represents a reflection coefficient,

Represents the osmotic pressure differential across the membrane,

Represents the operating pressure (Applied pressure).

)에 의해 전력밀도(

)는 다음과 같은 수학식 2와 같이 주어지면, 상기 전력밀도(

)의 단위는

이다The flux (

) To the power density (

Is given by Equation (2) below, the power density < RTI ID = 0.0 >

) Unit is

to be

Concretely, even in the case of the pressure delayed osmosis process, concentration polarization occurs in the separation membrane. At this time, dilution external concentration polarization occurs in the active layer, and concentration concentration polarization occurs in the support layer. As shown in FIG. 6, the dilution external concentration polarization is a phenomenon occurring between a high concentration induction solvent and an active layer (Dense Layer), and the concentration of the high concentration induction solvent on the surface of the active layer is lowered by the permeation flux passing through the separation membrane, The osmotic pressure at the front end and the rear end of the osmotic pressure decreases. 6 is a view showing that a cake layer is formed on the support layer of the pressure-delayed osmosis membrane module by internal concentration polarization and external concentration polarization by the particulate matter and organic matter in the separation membrane of the pressure-delayed osmosis membrane module.

The concentrated internal concentration polarization is a phenomenon in which the porous support layer is brought into contact with the low-concentration influent water. When the low-concentration influent water flows into the porous support layer by diffusion, the permeation flux . For example, since the solvent permeates through the separation membrane but does not permeate through the solute, the concentration of the solute in the porous support layer continuously increases. As shown in FIG. 7, the effective osmotic pressure difference between the front end and the rear end of the separation membrane decreases Thereby reducing the permeation flux. Here, FIG. 7 is a graph showing that the effective osmotic pressure decreases due to the internal concentration polarization and the external concentration polarization in the pressure delay osmosis process due to the mass transfer in the separation membrane of the pressure-delayed osmosis membrane module.

Next, the intra-membrane concentration polarization coefficient and the external concentration polarization coefficient of the pressure-delayed osmosis membrane module 190 are calculated (S104).

)는 다음과 같은 수학식 3으로 주어질 수 있다.Next, a power density curve for each operation pressure is created by considering the calculated internal concentration polarization factor and external concentration polarization factor according to the following equations (3) and (4) (S105). That is, the flux of the actual separator considering both dilution external concentration polarization and concentration concentration internal polarization

) Can be given by the following equation (3).

는 압력지연 삼투막 모듈 분리막의 물 여과계수(Permeability constant)를 나타내고,

는 분리막 표면에서의 유도용액 삼투압을 나타내며,

는 분리막 전체의 유도용액 삼투압을 나타내고,

는 염 여과계수(Salt permeability coefficient)를 나타내고,

는 물질전달계수(Mass transfer coefficient)를 나타내며,

는 용질 비저항(Solute resistivity)을 나타내고,

는 벌크 삼투압(Bulk osmotic pressure)을 나타내고,

는 운전압력을 나타낸다.here,

Represents the water permeability constant of the pressure-delayed osmosis membrane module membrane,

Represents the induced solution osmotic pressure at the membrane surface,

Represents the inductive solution osmotic pressure of the entire membrane,

Represents the salt permeability coefficient,

Represents the mass transfer coefficient,

Represents a solute resistivity,

Represents the bulk osmotic pressure,

Represents the operating pressure.

)를 고려한 전력밀도(

)는 다음과 같은 수학식 4와 같이 주어진다.Considering both the dilution external concentration polarization and the concentration concentration internal polarization described above, the permeation flux of the actual separation membrane

) Power density (

) Is given by the following Equation (4).

The equation (3) is a formula for calculating the permeation flux of the actual separation membrane in consideration of both the dilution external concentration polarization and the concentration concentration concentration polarization. Equation (4) Equation (3) for calculating the permeation flux of the separation membrane is combined to finally calculate the actual power density considering the internal and external concentration polarization.

Next, the maximum operating pressure and the maximum power density are derived from the power density curve for each operating pressure according to the internal numerical simulation model (S106). 9A, which will be described later, the power density curve calculated by the numerical analysis model is represented by a quadratic function expression. By the numerical analysis, the slope of the tangent line becomes "0" at the point where the power density becomes maximum, And the operating pressure for maintaining the maximum power density can be calculated by the numerical analysis model.

The reason for applying this method is that even if internal concentration polarization and external concentration polarization occur in the actual pressure-delayed osmosis membrane as shown in FIG. 6 and FIG. 7, The cake layer formed by the organic material is formed, and the cake layer formed in this way varies the maximum power density depending on the operation due to the change in the operation due to the Cake Enhanced Osmotic Pressure (CEOP) phenomenon which reduces the effective osmotic pressure.

Next, the energy consumption of the seawater desalination-power generation system is calculated based on the maximum power density of the operating pressure condition determined by the internal numerical simulation model (S107). That is, the total energy consumption of the seawater desalination-power generation system in which the reverse osmosis membrane module and the pressure-delayed osmosis membrane module are combined is calculated based on the maximum power density by the above-described numerical analysis model, And feedback control is performed on the operating pressure calculated in the numerical analysis model.

Next, it is determined whether the derived maximum power density is smaller than the set power density (S108). If the derived maximum power density is not smaller than the set power density, The osmotic power generation is performed by controlling the operating pressure of the delayed osmosis membrane module (S109).

Next, if the maximum power density is smaller than the set power density, the separation membrane of the high concentration induction solvent pump 180 and the pressure delay osmosis membrane module 190 is physically cleaned (S110). Specifically, the reverse osmosis concentrated water supplied from the reverse osmosis membrane module 140 performs physical cleaning of the high concentration solvent pump 180, and the final treatment of the reverse osmosis membrane module 140 is performed through the membrane washing water line 230 So that the separation membrane of the pressure-delayed osmosis membrane module 190 is cleaned.

Meanwhile, FIG. 8 is a graph showing the relationship between the data obtained by using the multi-channel pressure delay osmosis evaluation device in the seawater desalination-power generation system for cleaning the separation membrane and the induction solvent pump using the multi- FIG. 9A and FIG. 9B are graphs showing a pressure-delayed osmosis process control unit for performing a numerical analysis operation according to the present invention, FIG. 10 is a graph showing the relationship between pressure and power density acting on the high concentration induction solvent side of the pressure delayed osmosis process in a seawater desalination-power generation system for cleaning a solvent pump. In a seawater desalination-power generation system for cleaning a membrane and an induction solvent pump using a device, a membrane of a pressure-delayed osmosis membrane module Fig. 5 is a graph showing the effect of physical cleaning considering the contamination characteristics of the membrane.

The seawater desalination-power generation system for cleaning a separation membrane and an induction solvent pump using the multi-channel pressure delay osmosis evaluation apparatus according to an embodiment of the present invention includes a multi-channel pressure delay osmosis evaluation apparatus 300, Delayed osmosis process control unit 400, which performs a numerical analysis operation in accordance with the data obtained by using the pressure-delayed osmosis process control unit 400, is implemented by a program.

9A is a graph showing the relationship between the operating pressure applied to the high concentration induction solvent side of the pressure-delayed osmosis process in the seawater desalination-power generation system for cleaning the separation membrane and the induction solvent pump using the multi-channel pressure delay osmosis evaluation apparatus according to the embodiment of the present invention, 9b shows the relationship between the flow rate of the inducing solution and the flow rate of the influent in the seawater desalination-power generation system in which the separation membrane and the induction solvent pump are cleaned using the multi-channel pressure delay osmosis evaluation apparatus according to the embodiment of the present invention .

Also, as shown in FIG. 10, the seawater desalination-power generation system for cleaning the separation membrane and the induction solvent pump using the multi-channel pressure-delayed osmosis evaluation apparatus according to the embodiment of the present invention includes a separation membrane of the pressure- It is possible to effectively perform physical cleaning in consideration of the film fouling characteristic.

As a result, according to the embodiment of the present invention, in a seawater desalination-power generation system using a reverse osmosis membrane module and a pressure-delayed osmosis membrane module for seawater desalination-power generation, consideration is given to a cake layer due to internal and external concentration polarization and membrane pollutants The efficiency of the seawater desalination-power generation system can be continuously maintained by using the multi-channel pressure delay osmosis evaluation device to variably control the high concentration inductive solution pump according to the membrane characteristics of the pressure delay osmosis membrane module.

According to the embodiment of the present invention, the maximum power density of the pressure delay osmosis process taking into account the external concentration polarization coefficient and the internal concentration polarization factor based on the data measured by the multi-channel pressure delay osmosis evaluation device is determined by the external concentration polarization coefficient If it is determined that the pressure delayed osmosis membrane module needs to be cleaned, it is necessary to clean the membrane surface of the pressure-sensitive osmosis membrane module and the membrane contaminants of the high concentration induction solvent pump periodically, The osmotic membrane module can regain the reduced effective osmotic pressure due to membrane contaminants. Accordingly, the performance of the pressure delay osmosis process is continuously maintained by cleaning the separation membrane of the pressure-delayed osmosis membrane module and the high-concentration induction solvent pump, respectively, considering the membrane fouling characteristics such as concentration polarization inside and outside of the pressure- .

In addition, according to the embodiment of the present invention, energy is obtained from the reverse osmosis concentrated water of the reverse osmosis process, which may cause a serious problem in the marine environment, and is discharged at a concentration similar to seawater. Therefore, Friendly seawater desalination system that can discharge water directly to the sea.

It will be understood by those skilled in the art that the foregoing description of the present invention is for illustrative purposes only and that those of ordinary skill in the art can readily understand that various changes and modifications may be made without departing from the spirit or essential characteristics of the present invention. will be. It is therefore to be understood that the above-described embodiments are illustrative in all aspects and not restrictive. For example, each component described as a single entity may be distributed and implemented, and components described as being distributed may also be implemented in a combined form.

The scope of the present invention is defined by the appended claims rather than the detailed description and all changes or modifications derived from the meaning and scope of the claims and their equivalents are to be construed as being included within the scope of the present invention do.

110: Influent (seawater) storage tank
120: High pressure pump
130: Booster pump
140: Reverse Osmosis Module
150: Final treated water storage tank
160: First energy recovery device
170: Low concentration influent storage tank
171: Low concentration inflow water piping
180: High concentration induction solvent pump
181: High concentration induction solvent inflow pipe
190: pressure delay osmosis module
210: washing water line
220: permeable water storage tank
230: second energy recovery device
240: drain water storage tank
300: Multichannel pressure delay osmosis evaluation device
400: Pressure Delay Osmosis Process Control Unit
410: Data collection unit
420: model prediction control unit
430:
421: Model input unit
422: first numerical analysis operation section
423: second numerical analysis operation section
424: Model output section
431: Operation pressure error calculation unit
432:
500: Cleaning decision unit
510: Power Density Error Calculation Unit
520: Determination of Whether to Clean and Washing Pump Control

Claims (14)

In a seawater desalination-power generation system applying a reverse osmosis module for seawater desalination and a pressure retarded osmosis module for power generation,
A low-concentration influent storage tank 170 storing surface water or sewage effluent used as low-concentration influent water;
A pressure delay osmosis membrane module (190) connected to the high concentration induction solvent inflow pipe (181) so that the reverse osmosis concentrated water discharged from the reverse osmosis membrane module (140) flows into the pressure delayed osmosis membrane;
The sample is continuously supplied through one sampling pipe connected to one side of the high concentration induction solvent inflow pipe 181 at the upstream side of the pressure delay osmosis membrane module 190 and one side of the low concentration inflow water pipe 171 connected to the low concentration inflow water reservoir 170 Channel multi-channel pressure delay osmosis evaluation device 300 for evaluating multi-channel pressure delay osmosis to evaluate flux and membrane fouling per pressure of the pressure-delayed osmosis membrane module 190;
The data evaluated by the multi-channel pressure-delayed osmotic pressure evaluation apparatus 300, the influent flow rate of the samples taken from the high concentration solvent-introduced inflow pipe 181 and the low-concentration inflow pipe 171, and the concentration of TDS (total dissolved solids) A pressure delayed osmosis process control unit (400) for calculating the maximum power density in consideration of an internal concentration polarization coefficient and an external concentration polarization coefficient based on the data to control the pressure delay osmosis membrane module (190); And
The operating pressure for maintaining the maximum power density calculated by the pressure delayed osmosis process control unit 400 is calculated to feedback control the high concentration solvent pump 180 installed on the high concentration solvent inflow pipe 181, The cleaning decision control unit 500 determines to perform physical cleaning of the high concentration induction solvent pump 180 and the pressure delay osmosis membrane 190 separation membrane when the power density is maintained below the set power density,
Wherein the multi-channel pressure-delayed osmotic pressure measuring device is used to clean the membrane and the induction solvent pump. The method according to claim 1,
The multi-channel pressure delay osmosis evaluation apparatus 300 is composed of three cells 310, 320, and 330, and the operating pressure is set to 3 Wherein the high-concentration induction solvent and the low-concentration influent water are experimentally evaluated at different operating pressures, and the multi-channel pressure delay osmosis evaluation apparatus is used to clean the separation membrane and the induction solvent pump. 3. The method of claim 2,
The pressure-delayed osmosis process control unit 400 calculates the power density considering the internal concentration polarization coefficient and the external concentration polarization coefficient through a numerical analysis operation, generates a power density function curve, and calculates an operating pressure for maintaining the maximum power density And the operation pressure of the high concentration induction solvent pump (180) provided on the high concentration induction solvent inflow pipe (181) at the upstream side of the pressure delay osmosis membrane module (190) is feedback controlled. A desalination-power generation system for cleaning a separation membrane and an induction solvent pump. 4. The apparatus according to claim 3, wherein the pressure-delayed osmotic process control unit (400)
Data collecting data on TDS (total dissolved solids) and flow rate of each of the high concentration induction solvent and low concentration influent water and data on flux and membrane contamination by pressure calculated by the multi-channel pressure delay osmosis evaluation apparatus 300 (410);
The data obtained by measuring the TDS (total dissolved solids) and the flow rate of each of the high concentration induction solvent and the low concentration influent water from the data collection unit 410 and the data on the flux and membrane contamination by the pressure are received and the internal concentration polarization coefficient and the external concentration A model predictive controller 420 for calculating a power density considering a polarization coefficient and determining an operation pressure, a power density and a system energy of the pressure delay osmosis membrane module 190; And
A feedback controller 430 for calculating an error of the operation pressure according to the numerical analysis result of the model predictive controller 420 and performing feedback calculation according to the calculated operation pressure error and inputting the feedback error to the model predictive controller 420,
Wherein the multi-channel pressure-delayed osmotic pressure measuring device is used to clean the membrane and the induction solvent pump. 5. The apparatus of claim 4, wherein the feedback controller (430)
An operation pressure error calculator 431 for calculating an error of the operation pressure calculated by the second numerical analysis calculator 423 of the model predictive controller 420; And
A feedback calculator 432 for performing a feedback calculation according to the calculated error of the operation pressure and inputting the calculated feedback error to the model input unit 421 of the model predictive controller 420,
Wherein the multi-channel pressure-delayed osmotic pressure measuring device is used to clean the membrane and the induction solvent pump. The apparatus according to claim 1, wherein the cleaning decision controller (500)
The multi-channel pressure delay osmosis device (300) and the pressure-delayed osmosis process control unit (400) feedback-control an operating pressure that maintains the maximum power density finally calculated to calculate the calculated maximum power density A power density error calculator 510 for determining whether the power density error is small; And
Determining that the active layer and the support layer of the pressure-delayed osmosis membrane module 190 are physically cleaned using the final treated water of the reverse osmosis membrane module 140 as the washing water when the calculated maximum power density is smaller than the set power density, The flow rate of the washing water is determined so as to be cleaned at a flow rate higher than the normal flow rate of the high concentration induction solvent under the operating condition of the pressure delay osmosis membrane module 190,
Wherein the multi-channel pressure-delayed osmotic pressure measuring device is used to clean the membrane and the induction solvent pump. The method according to claim 6,
The reverse osmosis concentrated water supplied from the reverse osmosis membrane module 140 performs physical cleaning of the high concentration solvent pump 180 and the final treated water of the reverse osmosis membrane module 140 is supplied through the separation membrane cleaner water line 230 Channel ozone depletion membrane module 190. The seawater desalination-power generation system 100 cleans the separation membrane of the pressure-delayed osmosis membrane module 190 by using a multi-channel pressure delay osmosis evaluation device. A method of cleaning a membrane and an induction solvent pump of a pressure-delayed osmosis membrane module of a seawater desalination-power generation system applying a reverse osmosis membrane module for seawater desalination and applying a pressure delayed osmosis membrane module for power generation,
a) measuring the TDS and the flow rate of each of the high concentration induction solvent and the low concentration influent water through the sampling pipe;
b) evaluating multi-channel pressure delay osmotic pressure assessment device (300) flux and membrane contamination by pressure;
c) calculating the flux density and the power density without considering the internal concentration polarization factor and the external concentration polarization factor, and setting the flux density and the power density as the set power density;
d) calculating an internal concentration polarization factor and an external concentration polarization factor of the pressure delay osmosis membrane module (190) separation membrane;
e) generating a power density curve for each operating pressure by considering the internal concentration polarization factor and the external concentration polarization factor, deriving the maximum power density and operating pressure according to the numerical analysis model from the power density curve for each operating pressure;
f) calculating energy consumption of the entire system based on the maximum power density of the operating pressure condition; And
g) physically cleaning the separation membrane of the pressure delay osmosis membrane module 190 and the high concentration solvent pump 180 when the derived maximum power density is less than the set power density
Channel osmosis membrane module using a multi-channel pressure-delayed osmotic pressure evaluation device. 9. The method of claim 8,
h) performing the osmotic power generation by using the pump power as the pump control value of the high concentration inductive solution pump when the derived maximum power density is not less than the set power density and by controlling the operating pressure of the pressure delay osmosis membrane module 190 Channel pressure delay osmosis evaluation device, wherein the multi-channel pressure-delayed osmosis evaluation device further comprises: 9. The method of claim 8,
The multichannel pressure-delayed osmotic pressure evaluation apparatus 300 of the step b) is composed of three cells 310, 320 and 330, and the osmotic pressure of the high concentration solvent concentration of each cell 310, 320, Channel pressure-delayed osmotic pressure evaluation device is used to evaluate the high-concentration induction solvent and the low-concentration influent water at different operating pressures by dividing the operating pressure into three equal parts. . 9. The method of claim 8,
The flux of step c)

Lt; / RTI >

Represents the water filtration coefficient of the separation membrane,

Represents a reflection coefficient,

Represents the osmotic pressure difference of the separation membrane,

Represents the operating pressure, and the power density in step c)

)

Wherein the multi-channel pressure delay osmosis evaluation device is used to clean the separation membrane of the pressure-delayed osmosis membrane module and the induction solvent pump. 9. The method of claim 8,
The flux in the step d) may be determined by taking into consideration both the dilution external concentration polarization and the concentration concentration concentration polarization,

)as,

Lt; / RTI >

Represents the water filtration coefficient of the pressure-delayed osmosis membrane module membrane,

Represents the induced solution osmotic pressure at the membrane surface,

Represents the inductive solution osmotic pressure of the entire membrane,

Represents the salt filtration coefficient,

≪ / RTI > represents the mass transfer coefficient,

Represents a solute resistivity,

Lt; / RTI > represents the bulk osmotic pressure,

Represents the operating pressure, and the flux (d)

) Power density (

),

Wherein the multi-channel pressure delay osmosis evaluation device is used to clean the separation membrane of the pressure-delayed osmosis membrane module and the induction solvent pump. 9. The method of claim 8,
The power density curve calculated by the numerical analysis model in the step e) is represented by a quadratic function expression. By the numerical analysis, the solution value at which the slope of the tangent line becomes "0 " And the operating pressure for maintaining the maximum power density is calculated by the numerical analysis model. A method for cleaning a separation membrane and an induction solvent pump of a pressure-delayed osmosis membrane module using the multichannel pressure delay osmosis evaluation apparatus . 9. The method of claim 8,
The reverse osmosis concentrated water supplied from the reverse osmosis membrane module 140 performs physical cleaning of the high concentration solvent pump 180 and the final treatment water of the reverse osmosis membrane module 140 is supplied to the separation membrane detergent water line 230 Wherein the separation membrane of the pressure-delayed osmosis membrane module is cleaned by using the multi-channel pressure delay osmosis evaluation device.

Images