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WO2009151174A1 - Energy recovery apparatus driven by rotary plate valve - Google Patents

Energy recovery apparatus driven by rotary plate valve Download PDF

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Publication number
WO2009151174A1
WO2009151174A1 PCT/KR2008/003563 KR2008003563W WO2009151174A1 WO 2009151174 A1 WO2009151174 A1 WO 2009151174A1 KR 2008003563 W KR2008003563 W KR 2008003563W WO 2009151174 A1 WO2009151174 A1 WO 2009151174A1
Authority
WO
WIPO (PCT)
Prior art keywords
condensed water
power recovery
pressure
chamber
recovery chamber
Prior art date
Application number
PCT/KR2008/003563
Other languages
French (fr)
Inventor
Young-Bog Ham
Sang-Jin Park
Woo-Seop Lim
Sang-Gyu Jeon
Hyeon-Sig Kim
Joon-Ha Kim
Original Assignee
Korea Institute Of Machinery & Materials
Hyosung Ebara Co., Ltd.
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Korea Institute Of Machinery & Materials, Hyosung Ebara Co., Ltd. filed Critical Korea Institute Of Machinery & Materials
Publication of WO2009151174A1 publication Critical patent/WO2009151174A1/en

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D61/00—Processes of separation using semi-permeable membranes, e.g. dialysis, osmosis or ultrafiltration; Apparatus, accessories or auxiliary operations specially adapted therefor
    • B01D61/02—Reverse osmosis; Hyperfiltration ; Nanofiltration
    • B01D61/06—Energy recovery
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F1/00—Treatment of water, waste water, or sewage
    • C02F1/44—Treatment of water, waste water, or sewage by dialysis, osmosis or reverse osmosis
    • C02F1/441—Treatment of water, waste water, or sewage by dialysis, osmosis or reverse osmosis by reverse osmosis
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F2103/00—Nature of the water, waste water, sewage or sludge to be treated
    • C02F2103/08—Seawater, e.g. for desalination
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F2201/00—Apparatus for treatment of water, waste water or sewage
    • C02F2201/002—Construction details of the apparatus
    • C02F2201/005—Valves
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F2303/00—Specific treatment goals
    • C02F2303/10—Energy recovery
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
    • Y02A20/00—Water conservation; Efficient water supply; Efficient water use
    • Y02A20/124—Water desalination
    • Y02A20/131—Reverse-osmosis
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
    • Y02W10/00—Technologies for wastewater treatment
    • Y02W10/30—Wastewater or sewage treatment systems using renewable energies

Definitions

  • the present invention relates to an energy recovery apparatus, and more particularly to an energy recovery apparatus driven by a rotary plate valve, which is applied to a seawater desalination system discharging treated water, obtained by removing salt from seawater using reverse osmosis, and condensed water, and recovering the hydraulic power of the high-pressure condensed water and using the power to drive a seawater supply pump, and includes a plate valve and ball-type pistons to properly control the supply of the high- pressure condensed water.
  • a seawater desalination system using reverse osmosis filters out ionic materials dissolving in seawater from the seawater by a semi-permeable membrane (membrane), which does not pass ionic materials in water and passes pure water.
  • ⁇ 4> In order to divide ionic materials and pure water from seawater, a high pressure more than an osmotic pressure is required, and this pressure is referred to as reverse osmotic pressure.
  • a high pressure of approximately 42-70 bar is required for seawater desalination.
  • FIG. 1 is a schematic view of a general seawater desalination system using reverse osmosis.
  • seawater from the sea flows into the seawater desalination system and is stored in a raw water storing tank 1, and then turbidity is removed from the seawater by a pretreating unit 2 using sand filtering.
  • the pretreated seawater is stored in a supply tank 3, and then is supplied through a seawater supply low-pressure pump 4.
  • a portion of the seawater supplied through the low-pressure pump 4 is pressurized by a high-pressure pump 5, and then is supplied to a reverse osmosis module, i.e., a membrane 6.
  • a portion of the seawater supplied to the membrane 6 is discharged to the outside as treated water, obtained by removing salt from the seawater through a reverse osmotic action, and the remainder of the seawater is supplied to an energy recovery apparatus 7 as condensed water of a high pressure.
  • the energy recovery apparatus 7 pressurizes the seawater supplied by the low-pressure pump 4 using the high pressure of the condensed water supplied through the membrane 6 and then supplies the seawater to the membrane 6, thus being capable of reducing the capacities of the low-pressure pump 4 and the high-pressure pump 5 or reducing the powers of electric motors driving the low-pressure pump 4 and the high-pressure pump 5.
  • a booster pump 8 to add a pressure to the pressurized seawater supplied to the membrane 6 may be further provided.
  • the energy recovery apparatus 7 includes a pair of power recovery chambers 71(71a and 71b) respectively having pistons 711(711a and 711b) installed therein, a plurality of check valves 72 to intermit the seawater supplied to the power recovery chambers 71a and 71b, and an electric actuator operated spool valve 73 to control the pistons 711a and 711bin the power recovery chambers 71a and 71b such that the pistons 711a and 711b alternately reciprocate.
  • ⁇ i2> Hereinafter, with reference to FIGs. 2 and 3, the function of the energy recovery apparatus will be described in detail.
  • the low-pressure seawater supplied by the low-pressure pump 4 is supplied to the high-pressure pump 5 and the energy recovery apparatus 7.
  • a portion of the high-pressure seawater, passed through the high- pressure pump 5, is discharged as treated water, obtained by removing salt from the seawater through the membrane 6, and the remainder of the high- pressure seawater is supplied to the energy recovery apparatus 7 as condensed water of a high pressure.
  • the high-pressure condensed water is supplied alternately to the first power recovery chamber 71a and the second power recovery chamber 71b by the intermittence of the electric actuator operated spool valve 73.
  • the pistons 711a and 711b reciprocate due to the pressure of the high-pressure condensed water, and thus the high-pressure condensed water is supplied to the boost pump 8 by the selective opening and closing of the check valves 72 or the low-pressure seawater is selectively supplied to the first power recovery chamber 71a and the second power recovery chamber 71b.
  • ⁇ 16> For example, when the spool valve 73 opens the first power recovery chamber 71a such that the high-pressure condensed water is supplied to the first power recovery chamber 71a, the piston 711a in the first power recovery chamber 71a moves in the direction 'A' due to the pressure of the high- pressure condensed water and thus pressurizes low-pressure seawater and supplies the pressurized seawater to the membrane 6 through the boost pump 8. Thereby, the high-pressure seawater is supplied to the membrane 6 and thus assists driving power of the low-pressure pump 4 and the high-pressure pump 5.
  • the energy recovery apparatus recovers and utilizes the hydraulic power of the condensed water treated by the membrane, thereby being capable of reducing the capacities of the low-pressure pump 4 and the high-pressure pump 5 or reducing the driving powers of electric motors driving the low-pressure pump 4 and the high-pressure pump 5, and thus exhibiting an energy saving effect.
  • the energy recovery apparatus requires chambers, each of having a cylindrical piston, to apply the recovered hydraulic power to reverse osmosis, and a rectilinear motion spool valve to selectively control the motion of the cylindrical pistons in the chambers.
  • the present invention has been made in view of the above problems, and it is an object of the present invention to provide an energy recovery apparatus driven by a rotary plate valve, which includes a condensed water control valve block including the rotary plate valve as a substitute for a conventional spool valve selectively supplying condensed water to power recovery chambers, and directly controls the driving of the condensed water control valve block through the rotation of an electric motor, which can be stopped at an arbitrary angle and has a variably controlled speed, thus reducing the size of the apparatus, precisely controlling the operation of the apparatus, and straightening the flow of a fluid. [Technical Solution]
  • an energy recovery apparatus driven by a rotary plate valve of a seawater desalination system to discharge treated water, obtained by removing salt from seawater using reverse osmosis, and condensed water, which recovers the hydraulic power of the high-pressure condensed water and uses the power to drive a seawater supply pump, comprising a first power recovery chamber and a second power recovery chamber, into and out of which the condensed water flows due to the internal hydraulic powers thereof; a low-pressure seawater supply pipe connected to the first power recovery chamber and the second power recovery chamber to supply low-pressure seawater; a condensed water supply pipe, to which the high-pressure condensed water is supplied; a condensed water discharge pipe connected to the first power recovery chamber, the second power recovery chamber, and the condensed water supply pipe to discharge the condensed water to the outside; a high-pressure seawater supply pipe to pressurize and supply the low-pressure seawater due to the driving pressure
  • the condensed water control valve block may include a chamber cover provided with chamber ports respectively communicating with the first power recovery chamber and the second power recovery chamber; a condensed water inlet and outlet cover provided with a condensed water supply hole connected to the condensed water supply pipe and a condensed water discharge hole connected to the condensed water discharge pipe; and a rotary plate valve disposed between the chamber cover and the condensed water inlet and outlet cover, and provided with open holes causing the chamber ports to communicate selectively with the condensed water supply hole and the condensed water discharge hole.
  • a variable electric motor to control the rotation of the rotary plate valve may be provided at one side of the condensed water control valve block.
  • a ball piston may be provided in each of the first power recovery chamber and the second power recovery chamber, and a plurality of check valves may be provided in the low-pressure seawater supply pipe.
  • FIG. 1 is a schematic view of a general seawater desalination system using reverse osmosis
  • FIGs. 2 and 3 are views illustrating the function of an energy recovery apparatus of the seawater desalination system of FIG. 1;
  • FIG. 4 is a schematic view of an energy recovery apparatus driven by a rotary plate valve in accordance with an embodiment of the present invention
  • FIG. 5 is an exploded perspective view of a condensed water control valve block of FIG. 4;
  • FIG. 4 is a schematic view of an energy recovery apparatus driven by a rotary plate valve in accordance with an embodiment of the present invention
  • FIG. 5 is an exploded perspective view of a condensed water control valve block of FIG. 4.
  • the present invention relates to a seawater desalination system to discharge treated water, obtained by removing salt from seawater using reverse osmosis, and condensed water, which recovers the hydraulic power of the high-pressure condensed water and uses the power to drive a seawater supply pump.
  • an energy recovery apparatus 9 of the present invention includes a pair of power recovery chambers 91, a low-pressure recovery and supply pipe 41, a condensed water supply pipe 61, a condensed water discharge pipe 95, and a condensed water control valve block 93.
  • the pair of power recovery chambers 91 includes a first power recovery chamber 91a and a second power recovery chamber 91b.
  • Condensed water ports 92a and 92b through which condensed water flows into and out of the first and second power recovery chambers 91a and 91b, are respectively formed at sides of the first and second power recovery chambers 91a and 91b, and seawater ports 92c and 92d, through which seawater flows into and out of the first and second power recovery chambers 91a and 91b, are respectively formed at the other sides of the first and second power recovery chambers 91a and 91b.
  • pistons are respectively provided in the first and second power recovery chambers 91a and 91b.
  • ball pistons 911(911a and 911b) which respectively perform a rolling motion in the first and second power recovery chambers 91a and 91b, are used.
  • the embodiment of the present invention describes the ball pistons, other pistons having various shapes, such as cylindrical pistons, may be used.
  • Each of the ball pistons 911a and 911b in accordance with the embodiment of the present invention which has the shape of a floating ball, reciprocating in the chamber without a piston rod, serves to prevent the mixture of condensed water and seawater and transmit a pressure to the entered seawater due to the pressure of the condensed water, and comes in line contact with the inner wall of the chamber and thus has a low frictional resistance.
  • a plurality of check valves 94 to intermit the supply of the low- pressure seawater to the first power recovery chamber 91a and the second power recovery chamber 91b and the supply of the high-pressure seawater to the high-pressure seawater supply pipe 51 are provided at the connection portion between the low-pressure recovery and supply pipe 41 and the high- pressure seawater supply pipe 51.
  • the plurality of check valves 94 includes a first check valve 94a to supply the low-pressure seawater to the first power recovery chamber 91a, a second check valve 94b to intermit the supply of the high-pressure seawater pressurized by the first power recovery chamber 91a to the high-pressure seawater supply pipe 51, a third check valve 94c to intermit the supply of the high-pressure seawater pressurized by the second power recovery chamber 91b to the high-pressure seawater supply pipe 51, and a fourth check valve 94d to supply the low-pressure seawater to the second power recovery chamber 91b.
  • the condensed water supply pipe 61 to which the high-pressure condensed water, except for the treated water obtained by removing salt from the seawater through a general membrane 6, is supplied, is provided.
  • the condensed water discharge pipe 95 which discharges the condensed water from the first power recovery chamber 91a and the second power recovery chamber 91b to the outside, is provided.
  • the condensed water control valve block 93 is provided among the condensed water supply pipe 61, the condensed water discharge pipe 95, and the condensed water ports 92a and 92b, and selectively intermits the supply of the condensed water to the first power recovery chamber 91a and the second power recovery chamber 91b.
  • the condensed water control valve block 93 includes a chamber cover 931, a condensed water inlet and outlet cover 932, and a rotary plate valve 933, which are mutually supported to each other by a hydrostatic bearing method using the pressure of supplied water.
  • the chamber cover 931 is provided with chamber ports 931a and 931b, which communicate with the condensed water ports 92a and 92b of the first power recovery chamber 91a and the second power recovery chamber 91b.
  • the chamber ports 931a and 931b respectively have circular or arc shapes .
  • the chamber ports 931a and 931b include a first chamber port 931a communicating with the first power recovery chamber 91a and a second chamber port 931b communicating with the second power recovery chamber 91b.
  • the condensed water inlet and outlet cover 932 is provided with a condensed water supply hole 932a connected to the condensed water supply pipe 61 and a condensed water discharge hole 932b connected to the condensed water discharge pipe 95.
  • the holes 932a and 932b respectively have circular or arc shapes.
  • the rotary plate valve 933 is disposed between the chamber cover 931 and the condensed water inlet and outlet cover 932, and is provided with open holes 933a and 933b, which cause the chamber ports 931a and 931b to selectively communicate with the condensed water supply hole 932a and the condensed water discharge hole 932b.
  • the open holes 933a and 933b respectively have circular or arc shapes.
  • the open holes 933a and 933b include a first open hole 933a and a second open hole 933b, which are disposed at a designated interval.
  • a motor 934 to control the rotating direction or rotating speed of the rotary plate valve 933 is provided on the condensed water control valve block 93, and through holes 932c and 933c, into which a rotary shaft 935 of the motor 934 is inserted, are respectively formed through the centers of the condensed water inlet and outlet cover 932 and the rotary plate valve 933.
  • the motor 934 is an electric motor, the speed of which is variable, and controls the driving of the rotary plate valve 933 such that the rotating speed of the rotary plate valve 933 can be controlled or the rotation of the rotary plate valve 933 is stopped at an arbitrary angle and thus reduces pressure pulsation, thereby increasing the life of the apparatus with a silent driving.
  • FIGs. 6 to 8 respectively illustrate various embodiments of the shapes of components of the condensed water control valve block of FIG. 4.
  • the chamber ports 931a and 931b of the chamber cover 931 respectively have circular shapes, which are disposed at an interval of 180°
  • the condensed water supply hole 932a and the condensed water discharge hole 932b of the condensed water inlet and outlet cover 932 respectively have circular shapes, which are disposed at an interval of 180 °
  • the open holes 933a and 933b of the rotary plate valve 933 respectively have arc shapes, which are disposed at an interval of 180 ° .
  • the chamber ports 931a and 931b of the chamber cover 931 respectively have circular shapes, which are disposed at an interval of 180 °
  • the condensed water supply hole 932a and the condensed water discharge hole 932b of the condensed water inlet and outlet cover 932 respectively have arc shapes, which are disposed at an interval of 180 °
  • the open holes 933a and 933b of the rotary plate valve 933 respectively have arc shapes, which are disposed at an interval of 180 ° .
  • the chamber ports 931a and 931b of the chamber cover 931 respectively have arc shapes, which are disposed at an interval of 180°
  • the condensed water supply hole 932a and the condensed water discharge hole 932b of the condensed water inlet and outlet cover 932 respectively have arc shapes, which are disposed at an interval of 180 °
  • the open holes 933a and 933b of the rotary plate valve 933 respectively have arc shapes, which are disposed at an interval of 180 ° .
  • the rotary plate valve 933 is rotated by the driving of the motor 934 such that the first open hole 933a and the second open hole 933b cause the condensed water supply hole 932a or the condensed water discharge hole 932b to communicate selectively with the first chamber port 931a and the second chamber port 931b.
  • the first open hole 933a causes the first chamber port 931a and the condensed water supply hole 932a to communicate with each other
  • the second open hole 933b causes the second chamber port 931b and the condensed water discharge hole 932b to communicate with each other.
  • the high-pressure seawater supply pipe 51 is opened by the second check valve 95b, and high-pressure seawater is supplied to the membrane 6 through the high-pressure seawater supply pipe 51 and the boost pump 8.
  • the fourth check valve 95d is opened on condition that the second chamber port 931b and the condensed water discharge hole 932b communicate with each other and low-pressure seawater is supplied to the second power recovery chamber 91b, and thus the ball piston 911b in the second power recovery chamber 91b moves in the direction 'B', and the condensed water in the second power recovery chamber 91b is discharged to the outside through the second chamber port 931b and the condensed water discharge hole 932b.
  • the second open hole 933b causes the second chamber port 931b and the condensed water supply hole 932a to communicate with each other
  • the first open hole 933a causes the first chamber port 931a and the condensed water discharge hole 932b to communicate with each other.
  • the high-pressure seawater supply pipe 51 is opened by the third check valve 95c, and high-pressure seawater is supplied to the membrane 6 through the high-pressure seawater supply pipe 51 and the boost pump 8.
  • the first check valve 95a is opened on condition that the first chamber port 931a and the condensed water discharge hole 932b communicate with each other and low-pressure seawater is supplied to the first power recovery chamber 91a, and thus the ball piston 911a in the first power recovery chamber 91a moves in the direction 'B', and the condensed water in the first power recovery chamber 91a is discharged to the outside through the first chamber port 931a and the condensed water discharge hole 932b.
  • the condensed water control valve block having a small size is rotated, and thus controls the reciprocating motions of the pistons in the first and second power recovery chambers.
  • a condensed water control valve block includes the rotary plate valve supplying condensed water to power recovery chambers and an electric motor, which can be stopped at an arbitrary angle and has a variable speed, and the speed and position of the rotary plate valve are variably controlled by the electric motor, thus reducing the size of the valve as well as reducing pressure pulsation and straightening the flow of a fluid.

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  • Engineering & Computer Science (AREA)
  • Water Supply & Treatment (AREA)
  • Chemical & Material Sciences (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Hydrology & Water Resources (AREA)
  • Environmental & Geological Engineering (AREA)
  • Organic Chemistry (AREA)
  • Nanotechnology (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Separation Using Semi-Permeable Membranes (AREA)

Abstract

Disclosed is an energy recovery apparatus driven by a rotary plate valve, comprising a first power recovery chamber and a second power recovery chamber, into and out of which the condensed water flows due to the internal hydraulic powers thereof; a low-pressure seawater supply pipe; a high- pressure condensed water supply pipe; a condensed water discharge pipe; and a condensed water control valve block provided between the condensed water supply pipe and the condensed water discharge pipe to selectively intermit the supply of the condensed water to the first power recovery chamber and the second power recovery chamber.

Description

[DESCRIPTION] [Invention Title]
ENERGY RECOVERY APPARATUS DRIVEN BY ROTARY PLATE VALVE [Technical Field]
<i> The present invention relates to an energy recovery apparatus, and more particularly to an energy recovery apparatus driven by a rotary plate valve, which is applied to a seawater desalination system discharging treated water, obtained by removing salt from seawater using reverse osmosis, and condensed water, and recovering the hydraulic power of the high-pressure condensed water and using the power to drive a seawater supply pump, and includes a plate valve and ball-type pistons to properly control the supply of the high- pressure condensed water. [Background Art]
<2> In general, in order to obtain fresh water from seawater, ingredients dissolved in or floated on seawater must be removed to satisfy the standards of living water and drinking water. There are many seawater desalination methods including reverse osmosis and electro dialysis using a specific membrane, evaporation to convert seawater to vapor, freezing, utilization of solar heat, etc. Evaporation using phase change of a material was been generally used to desalinate seawater, but reverse osmosis and electro dialysis using a separation membrane have been mainly used to desalinate seawater now.
<3> A seawater desalination system using reverse osmosis filters out ionic materials dissolving in seawater from the seawater by a semi-permeable membrane (membrane), which does not pass ionic materials in water and passes pure water.
<4> In order to divide ionic materials and pure water from seawater, a high pressure more than an osmotic pressure is required, and this pressure is referred to as reverse osmotic pressure. Here, a high pressure of approximately 42-70 bar is required for seawater desalination.
<5> FIG. 1 is a schematic view of a general seawater desalination system using reverse osmosis.
<6> With reference to FIG. 1, seawater from the sea flows into the seawater desalination system and is stored in a raw water storing tank 1, and then turbidity is removed from the seawater by a pretreating unit 2 using sand filtering.
<7> The pretreated seawater is stored in a supply tank 3, and then is supplied through a seawater supply low-pressure pump 4.
<8> A portion of the seawater supplied through the low-pressure pump 4 is pressurized by a high-pressure pump 5, and then is supplied to a reverse osmosis module, i.e., a membrane 6.
<9> A portion of the seawater supplied to the membrane 6 is discharged to the outside as treated water, obtained by removing salt from the seawater through a reverse osmotic action, and the remainder of the seawater is supplied to an energy recovery apparatus 7 as condensed water of a high pressure.
<io> The energy recovery apparatus 7 pressurizes the seawater supplied by the low-pressure pump 4 using the high pressure of the condensed water supplied through the membrane 6 and then supplies the seawater to the membrane 6, thus being capable of reducing the capacities of the low-pressure pump 4 and the high-pressure pump 5 or reducing the powers of electric motors driving the low-pressure pump 4 and the high-pressure pump 5. Here, a booster pump 8 to add a pressure to the pressurized seawater supplied to the membrane 6 may be further provided.
<π> Here, the energy recovery apparatus 7 includes a pair of power recovery chambers 71(71a and 71b) respectively having pistons 711(711a and 711b) installed therein, a plurality of check valves 72 to intermit the seawater supplied to the power recovery chambers 71a and 71b, and an electric actuator operated spool valve 73 to control the pistons 711a and 711bin the power recovery chambers 71a and 71b such that the pistons 711a and 711b alternately reciprocate. <i2> Hereinafter, with reference to FIGs. 2 and 3, the function of the energy recovery apparatus will be described in detail.
<i3> With reference to FIG. 2, the low-pressure seawater supplied by the low-pressure pump 4 is supplied to the high-pressure pump 5 and the energy recovery apparatus 7.
<14> A portion of the high-pressure seawater, passed through the high- pressure pump 5, is discharged as treated water, obtained by removing salt from the seawater through the membrane 6, and the remainder of the high- pressure seawater is supplied to the energy recovery apparatus 7 as condensed water of a high pressure.
<15> The high-pressure condensed water is supplied alternately to the first power recovery chamber 71a and the second power recovery chamber 71b by the intermittence of the electric actuator operated spool valve 73. Here, the pistons 711a and 711b reciprocate due to the pressure of the high-pressure condensed water, and thus the high-pressure condensed water is supplied to the boost pump 8 by the selective opening and closing of the check valves 72 or the low-pressure seawater is selectively supplied to the first power recovery chamber 71a and the second power recovery chamber 71b.
<16> For example, when the spool valve 73 opens the first power recovery chamber 71a such that the high-pressure condensed water is supplied to the first power recovery chamber 71a, the piston 711a in the first power recovery chamber 71a moves in the direction 'A' due to the pressure of the high- pressure condensed water and thus pressurizes low-pressure seawater and supplies the pressurized seawater to the membrane 6 through the boost pump 8. Thereby, the high-pressure seawater is supplied to the membrane 6 and thus assists driving power of the low-pressure pump 4 and the high-pressure pump 5.
<i7> At this time, low-pressure seawater is supplied to the inside of the second power recovery pump 71b. Then, the piston 711b in the second power recovery chamber 71b moves in the direction 'B', and thereby, the high- pressure condensed water entered the second power recovery chamber 71b is converted into low-pressure condensed water, and then the low-pressure condensed water is discharged to the outside.
<18> On the other hand, with reference to FIG. 3, when the spool valve 73 opens the second power recovery chamber 71b such that the high-pressure condensed water is supplied to the second power recovery chamber 71b, the piston 711b in the second power recovery chamber 71b moves in the direction A due to the pressure of the high-pressure condensed water and thus pressurizes low-pressure seawater and supplies the pressurized seawater to the membrane 6 through the boost pump 8.
<19> At this time, low-pressure seawater is supplied to the inside of the first power recovery pump 71a. Then, the piston 711a in the first power recovery chamber 71a moves in the direction 'B', and thereby, the high- pressure condensed water entered the first power recovery chamber 71a is converted into low-pressure condensed water, and then the low-pressure condensed water is discharged to the outside.
<20> In the above seawater desalination system using reverse osmosis, the energy recovery apparatus recovers and utilizes the hydraulic power of the condensed water treated by the membrane, thereby being capable of reducing the capacities of the low-pressure pump 4 and the high-pressure pump 5 or reducing the driving powers of electric motors driving the low-pressure pump 4 and the high-pressure pump 5, and thus exhibiting an energy saving effect.
<2i> However, the energy recovery apparatus requires chambers, each of having a cylindrical piston, to apply the recovered hydraulic power to reverse osmosis, and a rectilinear motion spool valve to selectively control the motion of the cylindrical pistons in the chambers.
<22> That is, since the rotary motion of the electric motors must be converted into a rectilinear motion, or an electric actuator operated spool valve, such as an electric linear motor or a proportional electronic valve, must be provided at the outside of the chambers, the energy recovery apparatus has disadvantages, such as a complicated structure and an increase in size. [Disclosure] [Technical Problem]
<23> Therefore, the present invention has been made in view of the above problems, and it is an object of the present invention to provide an energy recovery apparatus driven by a rotary plate valve, which includes a condensed water control valve block including the rotary plate valve as a substitute for a conventional spool valve selectively supplying condensed water to power recovery chambers, and directly controls the driving of the condensed water control valve block through the rotation of an electric motor, which can be stopped at an arbitrary angle and has a variably controlled speed, thus reducing the size of the apparatus, precisely controlling the operation of the apparatus, and straightening the flow of a fluid. [Technical Solution]
<24> In accordance with the present invention, the above and other objects can be accomplished by the provision of an energy recovery apparatus driven by a rotary plate valve of a seawater desalination system to discharge treated water, obtained by removing salt from seawater using reverse osmosis, and condensed water, which recovers the hydraulic power of the high-pressure condensed water and uses the power to drive a seawater supply pump, comprising a first power recovery chamber and a second power recovery chamber, into and out of which the condensed water flows due to the internal hydraulic powers thereof; a low-pressure seawater supply pipe connected to the first power recovery chamber and the second power recovery chamber to supply low-pressure seawater; a condensed water supply pipe, to which the high-pressure condensed water is supplied; a condensed water discharge pipe connected to the first power recovery chamber, the second power recovery chamber, and the condensed water supply pipe to discharge the condensed water to the outside; a high-pressure seawater supply pipe to pressurize and supply the low-pressure seawater due to the driving pressures of the first power recovery chamber and the second power recovery chamber; and a condensed water control valve block provided between the condensed water supply pipe and the condensed water discharge pipe to selectively intermit the supply of the condensed water to the first power recovery chamber and the second power recovery chamber.
<25> The condensed water control valve block may include a chamber cover provided with chamber ports respectively communicating with the first power recovery chamber and the second power recovery chamber; a condensed water inlet and outlet cover provided with a condensed water supply hole connected to the condensed water supply pipe and a condensed water discharge hole connected to the condensed water discharge pipe; and a rotary plate valve disposed between the chamber cover and the condensed water inlet and outlet cover, and provided with open holes causing the chamber ports to communicate selectively with the condensed water supply hole and the condensed water discharge hole.
<26> A variable electric motor to control the rotation of the rotary plate valve may be provided at one side of the condensed water control valve block.
<27> A ball piston may be provided in each of the first power recovery chamber and the second power recovery chamber, and a plurality of check valves may be provided in the low-pressure seawater supply pipe. [Description of Drawings]
<28> The above and other objects, features and other advantages of the present invention will be more clearly understood from the following detailed description taken in conjunction with the accompanying drawings, in which:
<29> FIG. 1 is a schematic view of a general seawater desalination system using reverse osmosis;
<30> FIGs. 2 and 3 are views illustrating the function of an energy recovery apparatus of the seawater desalination system of FIG. 1;
<3i> FIG. 4 is a schematic view of an energy recovery apparatus driven by a rotary plate valve in accordance with an embodiment of the present invention
<32> FIG. 5 is an exploded perspective view of a condensed water control valve block of FIG. 4;
<33> FIGs. 6 to 8 respectively illustrate various embodiments of the shapes of components of the condensed water control valve block of FIG. 4; and <34> FIGs. 9 and 10 are views respectively illustrating the function of the energy recovery apparatuses driven by a rotary plate valve in accordance with the embodiment of the present invention. [Best Mode]
<35> Now, preferred embodiments of the present invention will be described in detail with reference to the annexed drawings.
<36> FIG. 4 is a schematic view of an energy recovery apparatus driven by a rotary plate valve in accordance with an embodiment of the present invention, and FIG. 5 is an exploded perspective view of a condensed water control valve block of FIG. 4. In the following description of the present invention, some parts, which are substantially the same as those in FIG. 1, are denoted by the same reference numerals even though they are depicted in different drawings.
<37> The present invention relates to a seawater desalination system to discharge treated water, obtained by removing salt from seawater using reverse osmosis, and condensed water, which recovers the hydraulic power of the high-pressure condensed water and uses the power to drive a seawater supply pump.
<38> With reference to FIG. 4, an energy recovery apparatus 9 of the present invention includes a pair of power recovery chambers 91, a low-pressure recovery and supply pipe 41, a condensed water supply pipe 61, a condensed water discharge pipe 95, and a condensed water control valve block 93.
<39> The pair of power recovery chambers 91 includes a first power recovery chamber 91a and a second power recovery chamber 91b. Condensed water ports 92a and 92b, through which condensed water flows into and out of the first and second power recovery chambers 91a and 91b, are respectively formed at sides of the first and second power recovery chambers 91a and 91b, and seawater ports 92c and 92d, through which seawater flows into and out of the first and second power recovery chambers 91a and 91b, are respectively formed at the other sides of the first and second power recovery chambers 91a and 91b. <40> Further, pistons are respectively provided in the first and second power recovery chambers 91a and 91b.
<4i> Here, ball pistons 911(911a and 911b), which respectively perform a rolling motion in the first and second power recovery chambers 91a and 91b, are used. Although the embodiment of the present invention describes the ball pistons, other pistons having various shapes, such as cylindrical pistons, may be used.
<42> Each of the ball pistons 911a and 911b in accordance with the embodiment of the present invention, which has the shape of a floating ball, reciprocating in the chamber without a piston rod, serves to prevent the mixture of condensed water and seawater and transmit a pressure to the entered seawater due to the pressure of the condensed water, and comes in line contact with the inner wall of the chamber and thus has a low frictional resistance.
<43> The low-pressure recovery and supply pipe 41 connected to the first power recovery chamber 91a and the second power recovery chamber 91b to supply low-pressure seawater and the high-pressure seawater supply pipe 51 pressurizing the low-pressure seawater by the pressure driving the ball pistons 911a and 911b in the first and second power recovery chambers 91a and 91b to supply high-pressure seawater to a membrane (not shown) through a boost pump 8 are provided at the seawater ports 92c and 92d.
<44> Here, the low-pressure recovery and supply pipe 41 and the high- pressure seawater supply pipe 51 are connected together with check valves 94.
<45> A plurality of check valves 94 to intermit the supply of the low- pressure seawater to the first power recovery chamber 91a and the second power recovery chamber 91b and the supply of the high-pressure seawater to the high-pressure seawater supply pipe 51 are provided at the connection portion between the low-pressure recovery and supply pipe 41 and the high- pressure seawater supply pipe 51.
<46> Here, the plurality of check valves 94 includes a first check valve 94a to supply the low-pressure seawater to the first power recovery chamber 91a, a second check valve 94b to intermit the supply of the high-pressure seawater pressurized by the first power recovery chamber 91a to the high-pressure seawater supply pipe 51, a third check valve 94c to intermit the supply of the high-pressure seawater pressurized by the second power recovery chamber 91b to the high-pressure seawater supply pipe 51, and a fourth check valve 94d to supply the low-pressure seawater to the second power recovery chamber 91b.
<47> Further, the condensed water supply pipe 61, to which the high-pressure condensed water, except for the treated water obtained by removing salt from the seawater through a general membrane 6, is supplied, is provided.
<48> The condensed water discharge pipe 95, which discharges the condensed water from the first power recovery chamber 91a and the second power recovery chamber 91b to the outside, is provided.
<49> The condensed water control valve block 93 is provided among the condensed water supply pipe 61, the condensed water discharge pipe 95, and the condensed water ports 92a and 92b, and selectively intermits the supply of the condensed water to the first power recovery chamber 91a and the second power recovery chamber 91b.
<50> Here, the condensed water control valve block 93 includes a chamber cover 931, a condensed water inlet and outlet cover 932, and a rotary plate valve 933, which are mutually supported to each other by a hydrostatic bearing method using the pressure of supplied water.
<5i> The chamber cover 931 is provided with chamber ports 931a and 931b, which communicate with the condensed water ports 92a and 92b of the first power recovery chamber 91a and the second power recovery chamber 91b. For example, the chamber ports 931a and 931b respectively have circular or arc shapes .
<52> Here, the chamber ports 931a and 931b include a first chamber port 931a communicating with the first power recovery chamber 91a and a second chamber port 931b communicating with the second power recovery chamber 91b.
<53> The condensed water inlet and outlet cover 932 is provided with a condensed water supply hole 932a connected to the condensed water supply pipe 61 and a condensed water discharge hole 932b connected to the condensed water discharge pipe 95. For example, the holes 932a and 932b respectively have circular or arc shapes.
<54> The rotary plate valve 933 is disposed between the chamber cover 931 and the condensed water inlet and outlet cover 932, and is provided with open holes 933a and 933b, which cause the chamber ports 931a and 931b to selectively communicate with the condensed water supply hole 932a and the condensed water discharge hole 932b. For example, the open holes 933a and 933b respectively have circular or arc shapes.
<55> Here, the open holes 933a and 933b include a first open hole 933a and a second open hole 933b, which are disposed at a designated interval.
<56> A motor 934 to control the rotating direction or rotating speed of the rotary plate valve 933 is provided on the condensed water control valve block 93, and through holes 932c and 933c, into which a rotary shaft 935 of the motor 934 is inserted, are respectively formed through the centers of the condensed water inlet and outlet cover 932 and the rotary plate valve 933.
<57> Here, the motor 934 is an electric motor, the speed of which is variable, and controls the driving of the rotary plate valve 933 such that the rotating speed of the rotary plate valve 933 can be controlled or the rotation of the rotary plate valve 933 is stopped at an arbitrary angle and thus reduces pressure pulsation, thereby increasing the life of the apparatus with a silent driving.
<58> FIGs. 6 to 8 respectively illustrate various embodiments of the shapes of components of the condensed water control valve block of FIG. 4.
<59> With reference to. FIG. 6, the chamber ports 931a and 931b of the chamber cover 931 respectively have circular shapes, which are disposed at an interval of 180° the condensed water supply hole 932a and the condensed water discharge hole 932b of the condensed water inlet and outlet cover 932 respectively have circular shapes, which are disposed at an interval of 180° and the open holes 933a and 933b of the rotary plate valve 933 respectively have arc shapes, which are disposed at an interval of 180° .
<60> With reference to FIG. 7, the chamber ports 931a and 931b of the chamber cover 931 respectively have circular shapes, which are disposed at an interval of 180° the condensed water supply hole 932a and the condensed water discharge hole 932b of the condensed water inlet and outlet cover 932 respectively have arc shapes, which are disposed at an interval of 180° and the open holes 933a and 933b of the rotary plate valve 933 respectively have arc shapes, which are disposed at an interval of 180° .
<6i> With reference to FIG. 8, the chamber ports 931a and 931b of the chamber cover 931 respectively have arc shapes, which are disposed at an interval of 180° the condensed water supply hole 932a and the condensed water discharge hole 932b of the condensed water inlet and outlet cover 932 respectively have arc shapes, which are disposed at an interval of 180° and the open holes 933a and 933b of the rotary plate valve 933 respectively have arc shapes, which are disposed at an interval of 180° .
<62> Hereinafter, with reference to FIGs. 9 and 10, the function of the energy recovery function driven by the rotary plate valve in accordance with the present invention will be described.
<63> First, as shown in FIG. 9, the rotary plate valve 933 is rotated by the driving of the motor 934 such that the first open hole 933a and the second open hole 933b cause the condensed water supply hole 932a or the condensed water discharge hole 932b to communicate selectively with the first chamber port 931a and the second chamber port 931b.
<64> More specifically, the first open hole 933a causes the first chamber port 931a and the condensed water supply hole 932a to communicate with each other, and the second open hole 933b causes the second chamber port 931b and the condensed water discharge hole 932b to communicate with each other.
<65> Thereby, high-pressure condensed water enters the inside of the first power recovery chamber 91a and the first ball piston 911a in the first power recovery chamber 91a moves in the direction 'A', and thus the inflow of low- pressure seawater into the first power recovery chamber 91a is prevented by the first check valve 95a and the third check valve 95c.
<66> Then, the high-pressure seawater supply pipe 51 is opened by the second check valve 95b, and high-pressure seawater is supplied to the membrane 6 through the high-pressure seawater supply pipe 51 and the boost pump 8.
<67> Here, the fourth check valve 95d is opened on condition that the second chamber port 931b and the condensed water discharge hole 932b communicate with each other and low-pressure seawater is supplied to the second power recovery chamber 91b, and thus the ball piston 911b in the second power recovery chamber 91b moves in the direction 'B', and the condensed water in the second power recovery chamber 91b is discharged to the outside through the second chamber port 931b and the condensed water discharge hole 932b.
<68> On the other hand, with reference to FIG. 10, the second open hole 933b causes the second chamber port 931b and the condensed water supply hole 932a to communicate with each other, and the first open hole 933a causes the first chamber port 931a and the condensed water discharge hole 932b to communicate with each other.
<69> Thereby, high-pressure condensed water enters the inside of the second power recovery chamber 91b and the second ball piston 911b in the second power recovery chamber 91b moves in the direction 'A', and thus the inflow of low-pressure seawater into the second power recovery chamber 91b is prevented by the second check valve 95b and the fourth check valve 95d.
<70> Then, the high-pressure seawater supply pipe 51 is opened by the third check valve 95c, and high-pressure seawater is supplied to the membrane 6 through the high-pressure seawater supply pipe 51 and the boost pump 8.
<7i> Here, the first check valve 95a is opened on condition that the first chamber port 931a and the condensed water discharge hole 932b communicate with each other and low-pressure seawater is supplied to the first power recovery chamber 91a, and thus the ball piston 911a in the first power recovery chamber 91a moves in the direction 'B', and the condensed water in the first power recovery chamber 91a is discharged to the outside through the first chamber port 931a and the condensed water discharge hole 932b. <72> As described above, in the present invention, the condensed water control valve block having a small size is rotated, and thus controls the reciprocating motions of the pistons in the first and second power recovery chambers. [Industrial Applicability]
<73> As apparent from the above description, the present invention provides an energy recovery apparatus driven by a rotary plate valve, in which a condensed water control valve block includes the rotary plate valve supplying condensed water to power recovery chambers and an electric motor, which can be stopped at an arbitrary angle and has a variable speed, and the speed and position of the rotary plate valve are variably controlled by the electric motor, thus reducing the size of the valve as well as reducing pressure pulsation and straightening the flow of a fluid.
<74> Although the preferred embodiments of the present invention have been disclosed for illustrative purposes, those skilled in the art will appreciate that various modifications, additions and substitutions are possible, without departing from the scope and spirit of the invention as disclosed in the accompanying claims.
<75>

Claims

[CLAIMS] [Claim 1]
An energy recovery apparatus driven by a rotary plate valve of a seawater desalination system to discharge treated water, obtained by removing salt from seawater using reverse osmosis, and condensed water, which recovers the hydraulic power of the high-pressure condensed water and uses the power to drive a seawater supply pump, comprising: a first power recovery chamber and a second power recovery chamber, into and out of which the condensed water flows due to the internal hydraulic powers thereof; a low-pressure seawater supply pipe connected to the first power recovery chamber and the second power recovery chamber to supply low-pressure seawater; a condensed water supply pipe, to which the high-pressure condensed water is supplied a condensed water discharge pipe connected to the first power recovery chamber, the second power recovery chamber, and the condensed water supply pipe to discharge the condensed water to the outside; a high-pressure seawater supply pipe to pressurize and supply the low- pressure seawater due to the driving pressures of the first power recovery chamber and the second power recovery chamber; and a condensed water control valve block provided between the condensed water supply pipe and the condensed water discharge pipe to selectively intermit the supply of the condensed water to the first power recovery chamber and the second power recovery chamber.
[Claim 2]
The energy recovery apparatus according to claim 1, wherein the condensed water control valve block includes: a chamber cover provided with chamber ports respectively communicating with the first power recovery chamber and the second power recovery chamber; a condensed water inlet and outlet cover provided with a condensed water supply hole connected to the condensed water supply pipe and a condensed water discharge hole connected to the condensed water discharge pipe; and a rotary plate valve disposed between the chamber cover and the condensed water inlet and outlet cover, and provided with open holes causing the chamber ports to communicate selectively with the condensed water supply hole and the condensed water discharge hole.
[Claim 3]
The energy recovery apparatus according to claim 2, wherein a variable electric motor to control the rotation of the rotary plate valve is provided at one side of the condensed water control valve block.
[Claim 4]
The energy recovery apparatus according to any one of claims 1 to 3, wherein a ball piston is provided in each of the first power recovery chamber and the second power recovery chamber.
[Claim 5]
The energy recovery apparatus according to claim 4, wherein a plurality of check valves is provided in the low-pressure seawater supply pipe.
PCT/KR2008/003563 2008-06-11 2008-06-23 Energy recovery apparatus driven by rotary plate valve WO2009151174A1 (en)

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