JP2003144856A - Energy recovery apparatus for reverse osmotic membrane apparatus - Google Patents

Abstract

PROBLEM TO BE SOLVED: To effectively use brine pressure without causing the failure, vibration, noise, and impact pressure of parts. SOLUTION: An apparatus to feed raw water to a reverse osmotic membrane apparatus 1 comprises a piston 21, a supply valve 22 of brine, an exhaust valve 23, a seawater cylinder part 24, a pump cylinder part 25, a reciprocating pump 2A provided with the above parts, a hydraulic piston 26 connected to the piston 21, high or low pressure hydraulic cylinder parts 27 or 28, a hydraulic cylinder apparatus 2B provided with these parts, two sets of feed water units 2 and 3 consisting of 3A and 3B of the same configuration as 2A and 2B, a hydraulic system 4, flow controllers 5 and 6 having an oil supply interruption time while stabilizing the sum total of an amount of oil supply of 2B and 3B, and an device 7 for controlling these parts, or the like. This configuration secures a stable operation based on the feed of a constant oil amount, reliably switches the opening/closing of the supply valve 22 and the exhaust valve 23 during the stop of the piston 21, prevents vibration, or the like, and effectively use the brine pressure.

Description

DETAILED DESCRIPTION OF THE INVENTION [0001] BACKGROUND OF THE INVENTION The present invention supplies raw material water.
Reverse soaking that discharges brine while draining brine
Energy for reverse osmosis membrane device that supplies the raw water to the membrane device
Gee recovery equipment used in brine pressure technology
It is. [0002] 2. Description of the Related Art Reverse osmosis membrane devices have pressures higher than reverse osmosis pressure.
The raw water is supplied and passed through the reverse osmosis membrane.
To remove the manufacturing water and remove the remaining raw water
This device is designed to discharge as in. And this
This brine is at high pressure, so this pressure energy
Is collected and used for pressurization of raw material water to save energy
Various devices have been conventionally known. Such a device is a drive device.
The piston is reciprocated by driving the crank mechanism with the rotating shaft.
Concentrated raw water discharge system on one side of this piston
The brine, which is concentrated raw water, is taken in and out of the piston.
Combined drive with sub-pump chamber designed to assist drive
Provide multiple devices and shift the phase of each device.
Supply brine and level raw water supply from main pump room
The reciprocating pump is designed to be supplied to the reverse osmosis membrane device.
A force recovery system has been proposed (JP-A-8-2946).
No. 19). In such a composite drive device, the piston
Open and close the brine supply valve and the discharge valve at the top and bottom dead centers.
Will be switched. In this case, just supply at the top and bottom dead center
If the valve and the discharge valve are opened and closed simultaneously and instantaneously,
Two consisting of a rotating crank mechanism and a brine cylinder
Even if there are other power generation sources, the raw water discharge line in the main pump room
The process and the intake process are smoothly switched. However, such valve operation is actually
Is impossible, for example, pouring brine pressure
Brine supply valve before top dead center when pump discharge stroke ends
When the valve is closed or the discharge valve is opened, the drive force by the brine is reduced.
The load is instantaneously applied to the crank mechanism, and the
The load mechanism is subjected to an impact load or energy from brine
A problem arises in that it cannot be recovered. Also, after the top dead center, the brine supply valve
If it is closed, it will enter the raw water intake process in the main pump room.
The drive force of the brine is reverse to the drive force of the crank mechanism
It will be used to give impact force. When entering the inhalation process
If the delay in opening the brine discharge valve occurs,
As the brine pressure rises abnormally, the piston does not move.
The problem arises that the rank mechanism is overloaded. As a result, the drive portion constituting the crank mechanism
Impact is applied to the product, and large pressure is applied to raw water and brine.
Fluctuations in force may cause loose parts, malfunctions, vibrations, noise, etc.
There is a problem of being born. And such problems
It has also occurred in devices that are already in practical use. On the other hand, a high-pressure pump which is a main booster
The seawater is sent to the reverse osmosis membrane type seawater desalination equipment,
Concentrated seawater brine is introduced to both sides of the cylinder.
A dynamic brine drive is installed, which
Reverse osmosis membrane by reciprocating Linda and sucking and discharging seawater
Energy recovery to be sent to a seawater desalination system
Has been proposed (see JP-A-1-123605).
See). According to this device, the drive for supplying seawater
Since the devices are independent, there is no interference between them
However, the above problem does not occur, but almost no driving force is required.
Use the high pressure of brine even in the unnecessary seawater inhalation process
Because of this, high-pressure brine is consumed in the intake stroke in terms of flow rate.
The pressure is not fully utilized, and the entire brine pressure
The utilization rate is almost halved and there is high-pressure brine.
There is a problem that it is not used effectively. [0010] The present invention is based on the prior art.
To solve the above problems, driving parts are
No sound or impact pressure is generated, and the driving force by brine pressure
Energy recovery device for reverse osmosis membrane device that can be used effectively
It is an issue to provide. [0011] The present invention solves the above problems.
Therefore, the invention of claim 1 supplies the raw water and supplies the bra
Reverse osmosis membrane that drains manufactured water while discharging in
Energy for reverse osmosis membrane device supplying the raw water to the device
In the recovery device, the brine is on one side of the piston.
To be supplied through the supply valve and discharged through the discharge valve
The drive unit formed on the one side and the raw material on the opposite side of the one side
A reciprocating pump having a pump section for pressurizing water and the pipe.
A hydraulic piston connected to the ston and the hydraulic piston
Hydraulic fluid is alternately supplied to one side and the opposite side
Hydraulic cylinder with hydraulic cylinder part formed like
An even number of composites combined with a device and the hydraulic operation
A hydraulic device for supplying oil, and the even-numbered complex
The amount of hydraulic fluid supplied to the odd number and the even number
Said hydraulic fluid supplied to an even number of composites of
Oil supply to control the total amount with the amount of oil almost constant
A quantity control means for supplying the hydraulic oil at regular intervals.
Oil supply amount control means for controlling to temporarily stop, the front
Opening and closing of the supply valve and opening and closing of the discharge valve during the temporary stop
And switching means for switching between
Energy recovery device for reverse osmosis membrane device. [0012] 1 shows a reverse osmosis membrane to which the present invention is applied.
An example of the whole structure of the energy recovery apparatus for apparatuses is shown. Book
The device supplies raw water such as seawater as raw water and brine
The production water that is desalted water is taken out while discharging
A device that supplies raw water to the reverse osmosis membrane device 1,
In this example as a complex, two water supply units 2, 3 and hydraulic pressure
Device 4, flow rate regulators 5, 6 as oil supply amount control means
And these control devices 7, the control device as switching means
7 and so on. The reverse osmosis membrane device 1 is not shown in detail in the figure.
However, it is of normal structure, for example about 6Mpa
Reverse about 40% of the seawater supplied to the raw water chamber 11 with the pressure of degree
Permeated through the osmotic membrane 12 to obtain demineralized water, taken from the outlet chamber 13
It is a device designed to protrude. Concentrated in raw water chamber 11
About 60% of the raw water with the same pressure of 6Mpa
Discharged as The water supply units 2 and 3 are the same. Obedience
The water supply unit 2 will be described. Water supply unit 2
Is one side of the piston 21 on the right side in the figure.
IN is supplied via the supply valve 22 and via the discharge valve 23
Seawater cylinder, which is a drive unit formed to be discharged
Raw water is pressurized on the left side which is the opposite side of the part 24 and the one side
The pump cylinder portion 25 which is a pump portion to be operated
Hydraulic pump connected to the return pump 2A and the piston 21
Ton 26 and its one side and the opposite side
So that hydraulic fluid is supplied alternately to the right and left sides.
High hydraulic cylinder portion 27 which is a formed hydraulic cylinder portion
And the hydraulic cylinder device 2 including the low hydraulic cylinder portion 28
B is combined. The pump cylinder portion 25 includes a check valve 251.
The raw water supply system 252 including
It includes a valve 253 and leads to the raw water chamber 11 of the reverse osmosis membrane device 1
The raw water pumping system 254 is connected. Sea water cylinder
Each of the 24 supply valves 22 and the discharge valve 23 has a raw water chamber.
11 brine introduction system 221 and brine discharge system 231
Is connected. The hydraulic piston 26 is connected by a connecting rod 261.
And connected to the seawater-side piston 21. Drawing
For simplicity, the illustration is omitted, but the hydraulic
A similar connecting rod 262 is provided on the opposite side of the connecting rod 261.
Is connected to the same as piston 21
Reciprocating pump 2 including the piston which is not connected
A reciprocating pump having the same configuration as A is provided. This figure
The reciprocating pump (not shown) is exactly the same as the raw water system and
Are connected. The water supply unit 2
Only one of the illustrated reciprocating pumps 2A may be provided.
Of course. The high and low hydraulic cylinders 27 and 28 have a flow rate control.
An oil supply system 271 branched from the joint device 5 by a hydraulic switching valve 51;
281 is connected, and automatic open / close valves 272, 28
2 is connected to an oil return system 41 that reaches the hydraulic device 4
Yes. The hydraulic device 4 includes high and low hydraulic cylinders 27, 2
8 is a device for supplying hydraulic fluid to the hydraulic fluid.
Generate oil pressure of 0Mpa. This device has hydraulic cylinder
High pressure oil supply to the flow controllers 5 and 6
A supply system 42 and the low-pressure oil return system 41 are connected. Flow rate regulators 5, 6 and oil quantity control means
In this example, the control device 7 is an even number of two water supply units.
The first water supply unit as an odd number of G
Of hydraulic fluid Q supplied to₁And even ones
The amount of hydraulic fluid supplied to the second water supply unit 3
Q₂And total amount Q = Q₁+ Q₂To make it almost constant
Control and temporarily stop supplying hydraulic oil at regular intervals.
Control to stop. At this time, for example, Q₁=
When 0, Q₂= Q at Q₂Is maximized. Therefore,
Q₁And Q₂Has flow characteristics with different timing.
Q is almost constant at any timing.
To be controlled. Such a flow rate characteristic is a reciprocating stroke, or
Based on the time elapsed according to this process.
The flow rate regulators 5, 6 of the supply units 2, 3 respectively.
Is a flow control valve that is driven by a motor, etc.
7 to obtain the control. Such flow characteristics
If the flow rate is expressed by a general formula, each of the flow regulators 5 and 6
The oil flow rate is Q₁= F (x) + a ------ (1) Q₂= -F (x) + b ----- (2) And the total flow is Q = Q₁+ Q₂= A + b = constant ---- (3) It turns out that. Where F (x) is a periodic function
That are repeated at regular intervals by reciprocating motion.
This enables continuous operation of the soldering device. Water supply
Unit 2 and 3 components are the same, and the operating device is
For rationalization, normally a = b. FIG. 2A shows an example of the above flow characteristics.
The In this figure, Q₁, Q₂Are the solid and dotted lines, respectively.
X and y indicate time and oil flow rate, respectively.
F (x) is a functional expression for the x axis, and the expression (1),
A and b in (2) are both c, and eventually y = Q₁, Q₂Is
This is a characteristic with respect to the x ′ axis that is c below the x axis.
The Each characteristic has a period T and a half period T
The phase is shifted by / 2. Such flow characteristics are characterized by valve lift and valve opening.
Or by adding the valve opening / closing speed to
Can be obtained by control technology. Note that in FIG.
The linear flow characteristics are shown as typical, but actually
Except for the valve being fully closed and fully open, the valve and the oil passing through it
It becomes a curve due to the inertia etc. The characteristic shown in FIG. 2 (a) is generally a triangular function curve.
Can be represented as a line, in which case the previous equation is       Q₁= Y = csin (x + 2πn) + c ------ (4)       Q₂= Y = csin (x + π) + 2πn) + c ------ (5)             (= −csin (x + 2πn) + c)       Q = Q₁+ Q₂= 2c ---- (6) It becomes. n is an integer. The difference π between equations (4) and (5) is
Represents a phase shift. Therefore, as the actual flow characteristics,
As shown in FIG. 2 (b), for example, a sinusoidal maximum with a period π
/ The part including the angle that becomes the minimum is the fully open and fully closed part of the valve.
However, a linearized version of this can be used. So
The actual oil flow rate is slightly lower than c in the above equation.
Less. In the flow rate control as described above, in this example,
The flow regulators 5 and 6 are connected to a ball valve or needle valve.
The quantity-adjustable valve parts 52 and 62 and the modules for opening and closing them.
And the control device 7
A timer 71 is provided, and the timer 71
By controlling the motor, the motors 53 and 63 are controlled to start and stop.
The purpose is shown in FIG. 2 and actually as shown in FIG.
The flow characteristics to be obtained are obtained. For valve structure etc.
Therefore, the speeds of the motors 53 and 63 are controlled as necessary.
You may do it. In this example, the flow characteristics as shown in FIG.
The opening / closing cycle of the flow regulator 5 is T = 5 seconds,
To = 4 seconds open and Tc = 1 seconds closed. And the amount of oil
In the adjuster 6, the phase is shifted 1 / 2T = 2.5 seconds from now on.
In the same way, To = 4 seconds open and Tc = 1 seconds closed
doing. The control device 7 also serves as a switching means, and the oil
During the temporary stop of the hydraulic fluid, thus the above-mentioned valves 52, 62
Supply valve 2 of reciprocating pumps 2A, 3A during 1 second closing
Switch between opening and closing of 2 and 32 and opening and closing of discharge valves 23 and 33
To control. That is, the timer 71
Within 1 second after sending valve closing signal to data
During the forward movement of the piston, the discharge valve 23 is closed and the supply valve
Open 22 and open and close these in the opposite direction.
The supply valve 32 and the discharge valve 3 are 2.5 seconds after the phase is delayed.
3 is similarly controlled to open and close. In FIG. 2, Tos is the entire valve
Indicates a stop in the open state. The energy cycle for the reverse osmosis membrane device as described above.
The collection device is operated as follows and exhibits its effects
The Operates the hydraulic device 4 and supplies hydraulic fluid to the hydraulic system
To the operable state and the control device 7 to be operable.
To do. Thereby, the oil quantity regulator of the water supply units 2 and 3
5, 6 and automatic valves are flown at a predetermined timing.
Volume control and open / close control are performed, and raw water is supplied to the reverse osmosis membrane device 1
The brine is discharged and the brine pressure energy
Energy for reverse osmosis membrane devices while energy is effectively utilized
The recovery device will be operated. In the following, FIG.
While referring to the water supply unit that supplies raw water and discharges brine
A description will be given of one-cycle operation of the units 2 and 3. 1) At the start of the forward stroke of the water supply unit 2 On the right end side of the flow characteristics diagram of the water supply units 2 and 3 in FIG.
R₁, S₁From the operating state indicated by the tentative time 0
The process starts. Hydraulic cylinder installation of water supply unit 2
The device 2B side is controlled by the control device 7 and the motor 53 is operated by the valve 5
2 is closed for 1 second and then opened, ie valve open
Hydraulic cylinder device and reciprocating pump in the state just before
Simplified states of cylinders and pistons 26 and 21
As shown in the lower side of the figure, the hydraulic piston 26 is
At the bottom dead center on the right side and top dead on the left side as shown by the arrow
It is in the state just before the forward movement that moves in the direction of the point. And the valve 5
During the 1 second closing of 2, the brine discharge valve 23 is closed.
The supply valve 22 is open. On the other hand, the oil of the water supply unit 3 shown on the upper side in the figure.
On the pressure cylinder device 3B side, the control device 7 controls
The motor 63 opens the valve 62 fully for 1 second and then closes it.
Hydraulic piston as in '
36 passes through the center position and falls a little as indicated by the arrow
It is in a state approaching the point direction. And the reciprocating pump 3
The piston 31 of A is also in the same backward movement state. This
In this case, the supply valve 32 is closed and the brine discharge valve 33 is
Is open and the brine in the seawater cylinder 34 is drained.
Has been issued. In the pump cylinder 35, the sea that is the raw water
Water is inhaled. At this time, the brine pressure is
Although it is not used, the pump drive
The power is small enough. In these and 'states, valve 52,
62 is fully closed and fully open, respectively, and the oil flow line
R in the figure₁, S₁The position flow is flowing. That is, illustrated
As shown in FIG. 2 and equations (1) to (6), Q₁= 0,
Q₂= 2c, Q = Q₁+ Q₂= 2c, constant value
The According to such flow control, the hydraulic cylinder
Even if the flow rate of oil on the compressor unit 2B becomes zero, the hydraulic cylinder
The oil flow rate on the device 3B side is the maximum 2c, and the total flow rate is
Since it becomes constant at 2c, the hydraulic device 4 is continuously operated at a constant flow rate.
Can be rolled. As a result, the configuration of the hydraulic device 4 is simplified.
As well as providing an oil relief system.
There is no energy loss. 2) The first half of the forward stroke of the water supply unit 2 The water supply unit 2 flows after about 0.75 seconds from time 0.
R of quantity characteristic diagram₂= S₂The above process is performed at the position. Immediately
That is, on the hydraulic cylinder device 2B side, the valve 52 is opened and high oil
Oil flows into the pressure cylinder 27 side, and the hydraulic piston
26 is in the forward stroke, and so is the reciprocating pump 2A.
It will be the forward travel process. At this time, during 1 second of valve closing before
The brine discharge valve 23 is closed and the supply valve 22 is opened.
Therefore, on the pump side, the brine pressure is positive on the forward side.
It really works. As a result, the brine pressure energy
Coordinate with the forward movement of the hydraulic cylinder device.
It is used effectively. And less hydraulic cylinders
The raw seawater of the pump cylinder 25 is reverse osmosis by the driving force
It is pumped to the membrane device 1. On the other hand, the hydraulic cylinder device of the water supply unit 3
On the 3B side, the motor 63 is controlled by the control device 7 so that the valve 6
2 is in the process of closing, like '
36 approaches the bottom dead center in the direction of the arrow. The reciprocating pump 3
A is also in the same state. In these and 'states
The valves 52 and 62 are both in the middle of full open and full close, respectively.
R of the oil flow diagram as described above₂= S₂Position
The flow rate is increased. That is, Q₁= Q₂= C and Q = 2c
Yes, a constant value. Therefore, from the state of ’
The hydraulic device 4 can be continuously operated as it is. 3) The first half of the forward stroke of the water supply unit 2 The water supply unit 2 has a flow rate of about 1.5 seconds from time 0.
R in the characteristic diagram_Three, S_ThreeThe above process is performed at the position. That is,
On the hydraulic cylinder device 2B side, the motor 53 opens the valve 52.
The maximum hydraulic fluid on the high hydraulic cylinder 27 side.
Flows into the hydraulic piston 26 during the forward stroke
Head to the heart position. And the reciprocating pump 2A has the same forward movement.
And the brine flow rate increases and pressure energy increases.
-Will be used to the fullest. On the other hand, the hydraulic cylinder device of the water supply unit 3
On the 3B side, the motor 63 closes the valve 62, like '
The operation of the hydraulic piston 36 stops and the bottom dead center is reached.
The The same applies to the reciprocating pump 3A. These and
In the state ', the valve 52 is fully open and the valve 62 is fully closed.
Each oil is R_ThreeAnd S_ThreeThe flow rate at the position, ie Q₂
= 0 and Q = Q₁= 2c, which is a constant value. Therefore,
, ′, ′, And then the hydraulic device 4 is
Continuous operation at a constant flow rate is possible. 4) The latter half of the forward stroke of the water supply unit 2 The water supply unit 2 has a flow rate of about 2.5 seconds from time 0.
R in the characteristic diagram_Four, S_FourThe above process is performed at the position. This line
The flow rate of oil is the same as that at time 0 in 1) above.
There are, however, water supply units 2 and 3
The water supply unit 2 moves forward as the state changes
There are differences in the process. That is, in the water supply unit 3
S_Three1 second after valve 62 is closed at the position
Maintain and be in the state just before opening, as in '
The state immediately before the reciprocation when the machine 36 is at the bottom dead center and moves toward the top dead center
Is in a state. The reciprocating pump 3A is also in the same state. And
During the 1 second closing of the valve 62, the brine discharge valve 33
Is closed and the supply valve 32 is open. On the other hand, the hydraulic cylinder device of the water supply unit 2
On the 2B side, valve 52 is R_ThreeThis is fully open at position 1
Maintained for 2 seconds, and when going to the closing direction
is there. However, the hydraulic piston 26 moves forward as
After passing the center position, approaching the top dead center
The The opening of the valve 52 is a maximum and the high hydraulic cylinder 27
The maximum flow rate of oil flows into the
Power energy is used to the maximum. In these and 'states, valve 52,
62 is fully open and fully closed respectively.₁= 2
c, Q₂= 0, Q = Q₁= 2c, same as before
Is a constant value. 5) The latter half of the forward stroke of the water supply unit 2 The water supply unit 2 flows after about 3.25 seconds from time 0.
R of quantity characteristic diagram_Five= S_FiveThe above process is performed at the position. this
In the process, the oil flow rate is the same as in 2) above.
The total flow of units 2 and 3 is constant at 2c
However, compared with the state of 2), the water supply unit 3 also moves forward.
It has become. At this time, the brine is discharged as described above.
The outlet valve 33 is closed and the water supply valve 32 is opened.
The line is fed to both seawater cylinders 24 and 34,
Both reciprocating pumps 2A and 3A use seawater to reverse osmosis membrane device 1
To supply. 6) At the end of the forward stroke of the water supply unit 2 The water supply unit 2 has a flow characteristic after about 4 seconds from time 0.
R in the figure₆, S₆The above process is performed at the position. In this process
The oil flow rate is the same as in step 3), but the water supply
The knit 2 side reaches the top dead center of the forward stroke, and the oil supply stops.
The piston is stopped and the supply unit 3
On the side, the oil reaches the maximum flow rate during the forward stroke. The total flow rate of oil in the water supply units 2 and 3 is 2c.
The water supply unit 3 enters the center of the forward travel,
The water cylinder 34 is supplied with the maximum amount of brine and reciprocates.
The dynamic pump 3A supplies the maximum amount of seawater to the reverse osmosis membrane device 1.
ing. On the water supply unit 2 side, a 1 second piss
During the ton stop, the brine supply valve 22 is closed and the discharge valve
23 opens. Therefore, until the top dead center is reached, the supply valve 2
2 and the closed state of the discharge valve 23 are reliably maintained,
The driving force by the brine disappears, and the load instantly oils
Do not apply a shock load to the pressure cylinder.
The condition does not occur and the driving force by the brine pressure
It will be fully effective. 7) At the start of the backward stroke of the water supply unit 2 Same as 1), but the water supply unit 2 side moves backward.
The water supply unit 3 side has oil in the forward stroke.
Enter the deceleration reduction from the maximum piston speed at the maximum flow rate.
It is in a state to be. At this point, the oil flow rate is 2
The maximum amount of seawater discharged from the reciprocating pump 3A is c.
From then on, the brine flow rate and seawater discharge rate will decrease.
Kau. On the other hand, in the water supply unit 2,
The brine in the cylinder 24 is discharged and the pump side
The reverse stroke of water inhalation begins. At this time, as above
Brine supply valve 23 closes and discharges while piston is stopped
Since the valve 22 is open, the brine driving force is hydraulic
Operation reverse to the movement of the device 2B, or the opening timing of the discharge valve is delayed
The brine is contained in the seawater cylinder 24,
A malfunction that would overload the hydraulic cylinder device occurred.
Without having to start the return stroke smoothly.
The And failure of parts in hydraulic cylinder device etc.,
Without generating vibration, noise or impact pressure
It is possible to ensure a favorable operating state of the soldering device. 8) The first half of the backward stroke of the water supply unit 2 2) Same as the state of 2), but the water supply unit 2 side moves backward.
The water supply unit 3 side becomes the forward stroke, and each stroke
The degree has been changed. Therefore, the water supply units 2 and 3
In 2), the other party's actions are performed. 9) The first half of the backward stroke of the water supply unit 2 3) Same as the state of 3), but the water supply unit 2 side moves backward.
The water supply unit 3 side has reached the top dead center of the forward stroke
The 10) First half of the backward stroke of the water supply unit 2
Period 4), but the water supply unit 2 side moves backward.
The water supply unit 3 side is about to move to the return stroke. 11) After the second half of the return stroke of the water supply unit 2
Period 5), but the water supply units 2 and 3 are both
It is the return stroke. 12) At the end of the return stroke of the water supply unit 2 It is the same as the state of 6).
The bottom dead center is reached and the water supply unit 3 side is in the reverse stroke
Yes. 13) At the start of the forward stroke of the water supply unit 2 1) Reciprocating stroke of water supply units 2 and 3 from time 0
Indicates a state in which is completed and has completely returned to 1). During this time
About 10 seconds have passed. The energy times for the reverse osmosis membrane device as described above.
According to the collecting device, the hydraulic cylinders of the water supply units 2 and 3
The flow rate characteristics are such that the total oil flow rate is constant 2c.
As the oil supply is stopped alternately,
When it stops, it becomes the top and bottom dead center of the reciprocating stroke of the piston.
The brine supply valve and the discharge valve can be switched to
The brine pressure should not interfere with the hydraulic piston movement.
Prevent the generation of vibration, vibration, noise and impact pressure
Can do. Meanwhile, stop the oil supply on one side of the water supply unit.
When stopping, make up for the oil flow for stopping on the other side.
Since the flow is only flow, always keep the hydraulic device at a constant flow rate
It can be in a stable operation state. The inventors have used the above-mentioned reverse osmosis membrane device.
As an energy recovery device, hydraulic cylinder device 2B, 3
The oil pressure of B is 70 MPa and the total constant flow rate Q of oil is 1.1 liters.
Torr / min, 1 stroke time 5 seconds, seawater cylinder 24
Inner diameter is 90mm, stroke between top and bottom dead center is 200m
m, the pressure applied to the reverse osmosis membrane is 6Mpa,
As discharge amount, brine discharge amount and production water amount respectively
1.8m^Three/ h, 1.1m^Three/ h, 0.7m^ThreeI got / h. Water
The recovery rate was 40%. And the vibration and noise of the device
Was able to be reduced. In the above, the complex is supplied to the supply unit 2,
The example of 2 sets of 3 has been explained.
Set even numbers such as 6 sets, etc., and set each set as shown in Fig. 1.
Energy recovery device for one reverse osmosis membrane device
Can be set. [0053] As described above, according to the present invention, the piston can be
Brine is supplied to one side via a supply valve and via a discharge valve
Drive part formed so as to be discharged and the reaction on one side
A reciprocating pump equipped with a pump part that pressurizes raw water on the opposite side
Supply a brine on one side
By pushing the piston from one side to the other side with pressure,
Pressurize the raw water with the pump on the other side and add it to the reverse osmosis membrane device.
Pressurized raw water can be supplied. As a result, the raw material using the high pressure of brine is used.
Water can be supplied under pressure. That is, the reciprocating pump
Since it is a single-acting type, the high pressure of the brine is discharged from the pump.
It works only at times and can improve its utilization.
And in the reverse osmosis membrane device, the production water can be taken out
Remove the pressurized brine and replace it with the brine feed.
Supply to the supply valve and use the pressure energy of pressurized brine
Can be. In addition, a hydraulic device is provided and the above-mentioned piston
Hydraulic piston connected to the ton and of this hydraulic piston
Hydraulic fluid from hydraulic system alternately on one side and the other side
(Hereinafter simply referred to as “oil”)
Provide a hydraulic cylinder device with a hydraulic cylinder part
Then, supply brine and pressurize the raw material water into the reverse osmosis membrane device.
When sending water, the pressure energy of the brine is insufficient.
Apply the driving force of the hydraulic piston to the part
The raw water can be supplied to the reverse osmosis membrane device at the required pressure.
Yes. On the other hand, on the side not using the brine pressure,
Need to drain brine from one side of pump piston
However, the driving force for this is obtained by a hydraulic piston.
To the pump unit while discharging the brine through the discharge valve.
The raw water is inhaled and the next pressurization stroke is made possible. This
In this case, the hydraulic cylinder device consumes drive power alone.
However, in the pump, the raw water intake process into the cylinder
Therefore, the power is slight. Next, the reciprocating pump and the hydraulic system as described above are used.
Combine with a Linda machine to form an even number of composites
So, for example, when two composites are used, the first reciprocating motion
A first combination of a pump and a first hydraulic cylinder device;
Combined with a second reciprocating pump and a second hydraulic cylinder device
A combined second complex is provided. An odd number of the even number of complexes and
In the above example, the amount of oil supplied to the first complex and the even number
The total amount of oil supplied to the second composite as
Oil supply amount control means to control to keep constant is provided.
With the control means, the oil supply is temporarily stopped at regular intervals.
For example, the hydraulic cylinder of the first complex
When the oil supply to the
A small amount of oil is supplied to the hydraulic cylinder device of the second complex
Will be. As a result, the hydraulic device always has a constant flow rate
Can be operated stably and continuously. And hydraulic equipment
As in the case of simplifying the installation configuration and providing an oil relief system.
The hydraulic system is effective without causing energy loss.
You can drive efficiently. Then, the supply of oil to the hydraulic cylinder device
Open and close the brine supply and discharge valves during the pause.
Since there is a switching means for switching, the conventional valve switching
The problem can be solved. That is, when the hydraulic supply is stopped
The piston stops moving and oil is supplied alternately
Hydraulic pressure is obtained by switching the oil in the formed hydraulic cylinder.
The forward and backward movement of the piston is switched, for example
During the piston stroke when the raw water is discharged
The top dead center is formed, but at this top dead center the hydraulic piston
The brine supply valve is closed and discharged while
Since the valve can be switched to open, the hydraulic drive force and
Problems with conventional devices, such as the reverse effect of brine driving force
The point is solved. That is, brine is used until the top dead center is reached.
It is possible to reliably maintain the open state of the supply valve and the closed state of the discharge valve.
The driving force due to the brine disappears and the load is instantaneous
Applying an impact load to the hydraulic cylinder device
Such a problem does not occur, and due to brine pressure
The driving force can be fully utilized. Exceed top dead center
When it is closed, the brine supply valve is closed and the discharge valve is open.
Since the condition is completed, the hydraulic pressure is in the reverse stroke
The brine drive force acts on the piston in reverse and gives a reverse load.
Are reliably prevented, and the brine is discharged.
Brine is sealed due to delay in the opening timing of the valve and hydraulic pressure
Reliable prevention of overloading of the piston
To generate component failure, vibration, noise and impact pressure.
And ensure good operating condition of the hydraulic cylinder device
be able to. As described above, according to the present invention, single-acting reciprocation
Dynamic pump, hydraulic cylinder device with oil supply stop timing,
Even number of combinations of composites that combine them, and even number
Constant total oil supply for odd and even ones
By adopting the configuration, the effective use of brine pressure
To obtain various effects such as ensuring stable operation of equipment
it can.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is an explanatory diagram showing an example of the overall configuration of an energy recovery device for a reverse osmosis membrane device to which the present invention is applied. FIGS. 2A and 2B are curves showing an example of a flow rate characteristic of hydraulic hydraulic fluid of a hydraulic cylinder device in the above apparatus. FIG. 3 is an explanatory diagram of the operation of the apparatus. [Description of Symbols] 1 Reverse osmosis membrane device 2, 3 Water supply unit (composite) 2A, 3A Reciprocating pump 2B, 3B Hydraulic cylinder device 4 Hydraulic devices 5, 6 Flow rate regulator (oil supply amount control means) 7 Control device (Oil supply amount control means, switching means) 21 Piston 22 Supply valve 23 Discharge valve 24 Seawater cylinder part (one side, drive part) 25 Pump cylinder part (opposite side, pump part) 26 Hydraulic piston 27 High hydraulic cylinder part (hydraulic pressure) Piston, one side of hydraulic piston) 28 Low hydraulic cylinder (opposite side of hydraulic piston, hydraulic cylinder)

Claims (1)

What is claimed is: 1. An energy recovery device for a reverse osmosis membrane device that supplies raw water to a reverse osmosis membrane device that supplies raw water and discharges production water while discharging brine. A drive unit formed so that the brine is supplied to one side of the piston through a supply valve and discharged through a discharge valve; and a pump unit to pressurize the raw water on the opposite side of the one side A reciprocating pump, a hydraulic piston connected to the piston, and a hydraulic cylinder device having a hydraulic cylinder portion formed so that hydraulic fluid is alternately supplied to one side of the hydraulic piston and the opposite side thereof. Combined even number of composites, hydraulic device for supplying the hydraulic fluid, amount of hydraulic fluid supplied to odd number of the even number of composites, and even number of composites Out of Oil supply amount control means for controlling the total amount of the hydraulic hydraulic fluid supplied to an even number to be substantially constant, and is controlled so as to temporarily stop the hydraulic fluid supply at regular intervals. An energy recovery device for a reverse osmosis membrane device, comprising: an oil supply amount control means for switching; and a switching means for switching between opening and closing of the supply valve and opening and closing of the discharge valve during the temporary stop.