JPS61132791A - Pump - Google Patents

Abstract

PURPOSE:To collect energy efficiently by leading the concentrated solution not permeated through reverse permeation film to a liquid pressure motor and utilizing the output from said motor as a portion of material liquid pressure feed pump. CONSTITUTION:Material liquid for reverse permeation desalting system is pressurized through a high pressure pump 3 then fed to reverse permeation film module 7. Desalted solution passed through the reverse permeation film and concentrated solution not passed through said film will co-exist in the module 7, where the solution not passed through said film is under high pressure condition thereby led through a conduit 13 to energy collection motor 4. then said solution is recovered of pressure energy and led to wast water pit 15 while the output from the motor 4 is utilized as a portion of the power of high pressure pump 3.

Description

[Detailed description of the invention] Industrial application field The present invention is applicable to high salt water such as seawater and brine! This invention relates to a high-pressure pump used in a one-time solution reverse osmosis method (hereinafter referred to as RO method) desalination equipment.

Conventional configuration and its problems Conventional high-pressure pumps with energy recovery devices in RO desalination equipment utilize the energy of concentrated high-pressure brine that does not pass through a reverse osmosis membrane using a multi-stage spiral turbine or Pelton turbine. A method of recovering energy and connecting the energy recovery device with a multi-stage centrifugal high-pressure pump is known, but since these high-pressure pumps with an energy recovery device use a multi-stage centrifugal pump, large-capacity Although it can be applied efficiently to RO method desalination equipment, multistage centrifugal pumps are inefficient for small-capacity desalination equipment, and even if an energy recovery device is installed, it is not practical.

Therefore, it has been common practice to use a small-capacity, high-efficiency piston-type high-pressure pump in a small-capacity RO desalination device without an energy recovery device.

In such a high-pressure pump, the energy of the high-pressure brine is not recovered, and the high-pressure brine must be released to atmospheric pressure via a back pressure valve or the like. This not only makes it impossible to use energy effectively, but also causes drawbacks such as wear of the back pressure valve.

OBJECTS OF THE INVENTION It is an object of the present invention to provide a high-pressure pump that efficiently connects an energy recovery device to the conventional small-capacity RO desalination device.

Structure of the Invention In order to achieve the above object, the high-pressure pump of the present invention uses a sliding type impeller pump that supplies raw material liquid at high pressure and a sliding type impeller motor having the same capacity or a small capacity as the pump for energy recovery. The main purpose of this device is to connect it as a device, and to respond to changes in the water supply amount or high-pressure brine amount, which vary depending on the usage conditions of the RO method desalination device, either one or both of the above seven items can be connected. It may also be configured as a variable capacitance type. By configuring as described above, it is possible to recover energy, downsize the high-pressure pump driving motor, and obtain an energy saving effect.

Examples and effects of real power Hereinafter, practical examples of the present invention will be explained based on the drawings.

Figure 1 is an overall flow diagram of the RO method desalination equipment related to the present invention, (t) H raw material liquid pump, (2) pre-treatment filter that supplies water to the URO method desalination equipment, (3 ha high pressure pump, ( 4) U energy recovery motor, (51H high-pressure pump prime mover, (6) and (g) respectively indicate the shaft joint that connects the high-pressure pump and the high-pressure pump prime mover, and the energy recovery motor and the high-pressure pump prime mover. Generally ( 6
0(7) indicates an RO membrane module using a Securanote joint in ). The raw material liquid is transferred from the raw material solution tank (to) to the conduit (8
) into the pumping pump (1) and into the conduit (9).
, (L() and the filter inserted in the middle
(2) It is sent to the high pressure pump (3) via e. The raw material g is pressurized by a high-pressure pump and enters the RO membrane module (7) through the conduit (b). In the RO membrane module, the permeate water is separated into desalinated permeate that has passed through the HRO membrane and a concentrated solution that has not passed through the RO membrane. The concentrated solution that does not pass through the RO membrane is under high pressure and enters the energy recovery motor (4) through the conduit (to), is depressurized at atmospheric pressure 1, and is sent to the waste water bit (15') through the conduit (14). Guided to R.
The permeated water that has passed through the O membrane and been desalinated is at approximately atmospheric pressure,
It is provided for its use via a conduit (6).

The above is a general process flow description of the RO method desalination equipment equipped with a synthetic energy recovery device. Or, if there is no energy recovery motor (4), high back pressure is applied to the concentrated waste flowing through the conduit (2) in order to pass the high-pressure raw material solution through the RO membrane, and the RO membrane is desalinated and permeated. You need to allow water to pass through. Therefore, not only is it impossible to recover and utilize the back pressure energy of this high-pressure concentrated waste liquid, but also corrosion of the back pressure valve often causes failure of the Ro method desalination equipment.

An axial cross-sectional view of the high-pressure pump of the present invention is shown in FIG. 2, and FIG. 3 is a cross-sectional view taken along line A-A.

(2) is a pump caning, 0.2mm through shaft, which is connected to the high pressure pump rotor (to) and the rotor of the energy recovery motor. (7) represent blades fitted into the respective rotors, and slide on the circular inner peripheries of the housings (9), (6) eccentric to the rotors, respectively.

On the high-pressure pump side, the solution enters the high-pressure pump housing through the suction conduit, is pressurized by the vanes, and is discharged through the discharge conduit.

The concentrated solution that does not pass through the RO membrane passes through the suction conduit of the energy recovery motor, enters the housing (6), drives the impeller (a), is depressurized, and is discharged through the discharge conduit (7).

By combining the high-pressure pump and the energy recovery motor on a single shaft as described above, it is possible to reduce the load on the prime mover and make it more compact.

The frame shown in Fig. 2iC is the shaft end cover, (9) is the bearing ring, and (9) is the bearing. , the amount of water will pass through the orange (6) and the solution will leak out.

As shown in the A-A sectional view of Fig. 3, valve seat hole 0]), valve I3
The valve consisting of a, a spring race, an adjusting screw (b), and a frame (g) is a pressure regulating valve at the pump outlet, and the liquid pressure is guided through a branch pipe from the discharge conduit slope. Although the regulating valve is only installed on the pump side and not on the recovery motor side, other configurations of the energy recovery motor μ
It is omitted because it is the same as the configuration in the AA cross-sectional view.

In the RO method desalination equipment, where the amount of water supplied is Q1 and the amount of permeated water is G, the general value VcG/Q is called the recovery rate.

On the other hand, in the RO method salt equipment, as the raw material solution temperature and raw material solution concentration change, the amount and quality of permeated water change if the recovery rate is constant.

That is, as the temperature of the raw material solution increases or decreases, the amount of permeated water and the total dissolved solids (abbreviated as TDS) in the permeated water increase or decrease in proportion to each other.

Furthermore, when the temperature of the raw material solution and the recovery rate are constant, the TDS of the permeated water also increases or decreases in proportion to the concentration of the solution. It also changes in inverse proportion to the TDSU recovery rate of permeated water.

Therefore, when it is required to keep the quality of the permeated water constant, it is necessary to change the recovery rate in inverse proportion to changes in the solution temperature, such as a.

Changes in the recovery rate can be achieved by changing the capacity of either, or both, the amount of liquid supplied to the RO decontamination system or the supply of energy to the energy recovery motor.

Figure 4 shows the variable displacement method for an energy recovery motor that straddles a high-pressure pump. A cam ring (51
') is inserted into the space (5z) of the casing (21'). The cam ring (51') position in Fig. 4 indicates the position of the maximum amount of suction and discharge, and by moving the cam ring via the lever (53'), the suction and discharge amount decreases, and the cam ring is concentric with the shaft (2z). When this happens, the suction and discharge amount becomes 0. (27') is a discharge hole, and (28') f'i is a suction hole.

By installing such a variable capacity suction/discharge rotor on either the high pressure pump or the energy recovery motor, or on both, a high pressure pump for RO method desalination equipment with an energy recovery motor with variable recovery rate can be obtained. be able to.

As described above, according to the present invention, it is possible to recover more energy from high-pressure waste liquid than in the RO method desalination equipment that uses a positive displacement water pump alone, and by making advanced use of energy, the capacity of the prime mover can be reduced, resulting in energy consumption. The amount can be reduced.

[Brief explanation of drawings]

Figure 1l-j is a flow route showing the energy recovery system of the Ro method desalination equipment. (1)...Raw material g pump (2)...Pre-treatment filter (3)...High pressure water supply pump (7)...R
O module (4)・Energy recovery device (5)・
・・Motor α→・・・Raw material solution tank (15')・
...Wastewater pit Fig. 29 Fig. 31 Fig. 4 is a purchasing drawing showing an actual cell example of the present invention. (2))...Casing (a)...Pot side of the penetrating shaft (a)...Recovery side rotor (
7) Pump side housing (c) Recovery side housing (c) Bong side vane (7) Recovery side vane Of course... Pump side discharge hole (to) Pump side Suction port 0: Pump side pressure regulating valve race... Pressure regulating valve spring (b)... Pressure regulating screw

Claims (1)

[Claims] 1. A pump having a casing provided with suction and discharge holes, an impeller that slides on the inner surface of the casing, and the suction and discharge holes of this pump.
In a positive displacement suction/discharge rotor consisting of a casing with suction/discharge holes separate from the discharge hole and a hydraulic motor with an impeller sliding on the inner surface of the casing, the pump impeller and the hydraulic motor impeller are placed on the same axis. An energy recovery pump characterized by a combination of a pump casing and a hydraulic motor casing. 2 A movable cam ring is provided on either the pump or the hydraulic motor, or both, and an impeller slides on the inner surface of the cam ring, and by moving the cam ring, the ratio between the pump discharge amount and the water pressure motor suction amount is changed. The energy recovery pump according to claim 1, characterized in that the energy recovery pump is configured to be able to