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Control device of seawater desalination system and control method thereof

A control device, seawater technology, applied in various fluid ratio control, osmotic/dialysis water/sewage treatment, general water supply saving, etc., can solve the problem of inability to realize the control corresponding to the concentration change, and achieve the effect of low operating cost

Inactive Publication Date: 2012-10-24
HITACHI LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] Therefore, in the conventional constant injection rate control, turbidity proportional control, and coagulant injection control based on the value of SDI, control corresponding to the concentration change of polysaccharides contained in seawater cannot be realized, and fouling of the semipermeable membrane occurs rapidly. Development situation

Method used

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  • Control device of seawater desalination system and control method thereof
  • Control device of seawater desalination system and control method thereof
  • Control device of seawater desalination system and control method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0027] figure 1 It is a figure which shows the flow in Example 1 of the control apparatus of the seawater desalination system of this invention.

[0028] As shown in the figure, the control device of the seawater desalination system in Embodiment 1 roughly includes: a semipermeable membrane treatment device 12, which uses a semipermeable membrane to desalinate seawater 1; a pretreatment device 10, configured to treat the semipermeable membrane The front section of the device 12 pre-treats the seawater 1 supplied to the semi-permeable membrane treatment device 12; the pre-treated water polysaccharide measuring unit 14 measures the concentration of polysaccharides contained in the treated water of the pre-treatment device 10; and controls The unit 20 calculates the operation amount of the pretreatment device 10 based on the polysaccharide concentration information 18 which is the measured value of the pretreated water polysaccharide concentration measured by the pretreated water...

Embodiment 2

[0055] Figure 4 It is a figure which shows the flow in Example 2 of the control apparatus of the seawater desalination system of this invention.

[0056] As shown in this figure, in the control device of the seawater desalination system in Embodiment 2, its structure is the same as figure 1 as well as figure 2 The illustrated embodiment 1 is substantially the same, but in the pretreatment device 10 in the embodiment 2, the treatment of injecting a coagulant, that is, coagulation treatment, or coagulation precipitation treatment is included. In addition, in Example 2, in addition to the configuration of Example 1, a solid particle injection device 26 for injecting solid particles into seawater 1 before injecting a coagulant is provided. As solid particles, powdered activated carbon, zeolite powder, alumina powder, and magnetic particles can also be expected to adsorb polysaccharides on their surfaces, so they are effective.

[0057] The solid particle injection device 26 h...

Embodiment 3

[0083] Figure 5 It is a figure which shows the flow in Example 3 of the control apparatus of the seawater desalination system of this invention.

[0084] As shown in this figure, in the control device of the seawater desalination system in Embodiment 3, its structure is the same as figure 1 as well as figure 2 Example 1 shown is substantially the same, but as one of the pretreatment devices 10 in Example 3, any one of sand filtration treatment, multimedia filtration treatment, and pressurized floating separation treatment is used.

[0085] The pretreatment water 16 flowing out from the pretreatment device 10 flows into the semipermeable membrane treatment device 12, and the concentration of polysaccharides contained therein is measured by the pretreatment water polysaccharide concentration measurement unit 14, and the turbidity is measured by the turbidity measurement device 30 simultaneously. The degree is provided to the control unit 20 as turbidity information 32 . To ...

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Abstract

The present invention realizes a seawater desalination system which controls preprocessing in a way of reducing dirt of a semipermeable membrane according to the amount of dirt component contained in seawater or salt water, so as to stably obtain fresh water with a low operating cost. In order to solve the above problem, the seawater desalination system of the present invention is characterized by comprising: a semipermeable membrane processing device used for performing desalination for the seawater or salt water by using the semipermeable membrane; a preprocessing device which is configured at a section more front than the semipermeable membrane processing device and used for performing preprocessing for the seawater or salt water supplied to the semipermeable membrane processing device; a preprocessing water polysaccharide measuring unit used for measuring the concentration of polysaccharides contained in the processed water which has been processed by the preprocessing device; and a control unit used for calculating operating quantity of the preprocessing device according to a preprocessing water polysaccharide concentration measured value measured by the preprocessing water polysaccharide measuring unit and a target signal provided in advance, so as to output a control signal to the preprocessing device.

Description

technical field [0001] The present invention relates to a control device and a control method for a seawater desalination system, and in particular to a control device and a control method for a seawater desalination system suitable for use in a seawater desalination system using a semipermeable membrane in order to obtain fresh water from seawater or salt water . Background technique [0002] In recent years, in seawater desalination systems using semipermeable membranes, especially reverse osmosis membranes, it has been reported that membrane fouling (insoluble components contained in raw water, polymer solutes, colloids, tiny solids, etc. And the phenomenon of reducing the permeated flux) is an example of a big problem. [0003] Various pretreatments such as coagulation treatment, coagulation sedimentation treatment, sand filtration treatment, multi-media filtration treatment, pressurized flotation separation treatment, precision membrane filtration treatment, and ultra-...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D61/10C02F1/44G05D11/02
CPCY02A20/131Y02A20/144
Inventor 阴山晃治隅仓岬馆隆广田所秀之荒戸利昭
Owner HITACHI LTD