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A multi-objective optimization method for reverse osmosis desalination system considering environmental impact

A multi-objective optimization and environmental impact technology, applied in chemical instruments and methods, osmosis/dialysis water/sewage treatment, seawater treatment, etc., can solve the problem of reverse osmosis deboronation of seawater that has not considered the cost of water production, energy consumption and environmental impact Desalination system multi-objective optimization method and other issues

Pending Publication Date: 2019-01-15
HEBEI UNIV OF TECH
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Problems solved by technology

However, there is no multi-objective optimization method for reverse osmosis deboration seawater desalination system considering water production cost, energy consumption and environmental impact.

Method used

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  • A multi-objective optimization method for reverse osmosis desalination system considering environmental impact
  • A multi-objective optimization method for reverse osmosis desalination system considering environmental impact
  • A multi-objective optimization method for reverse osmosis desalination system considering environmental impact

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Embodiment Construction

[0149] The present invention will be further described below in conjunction with accompanying drawing:

[0150] The present invention comprises the following steps:

[0151] 1. A multi-objective optimization method for reverse osmosis deboration seawater desalination system considering environmental impact, is characterized in that the method comprises the following steps:

[0152] Step 1: Established process model of reverse osmosis deboration seawater desalination with roll-type membrane elements;

[0153] According to the mechanism of the reverse osmosis process, the differential equation is used to describe the changes of salinity, boron concentration, pressure, flow, etc. in the pressure vessel along its axial direction, and the differential equation of the finite difference method is discretized to obtain the following equation:

[0154]

[0155]

[0156] σ=0.997-4.98×10 -5 T (3)

[0157]

[0158] σ TB，l = α 0，l σ boric +α 1，l σ borate (5)

[0159] pK ...

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Abstract

The invention discloses a multi-objective optimization method of reverse osmosis deboronization seawater desalination system considering environmental influence, based on the precise model of desalination mechanism and the superstructure model of reverse osmosis system, considering the changes of pressure, concentration and flow of brine along the axial direction of pressure vessel, and the increase of salinity caused by the mixing of brine in power exchanger, the constraint of operation conditions is added to ensure the safe operation of the system, and the multi-objective optimization problem with the cost of water production, energy consumption and environmental impact (carbon dioxide emission) as the objective function is obtained. Constraint algorithm is used to solve the problem, andthe optimal solution of different objective function weights is obtained by fuzzy sorting method. A system optimization scheme obtain by the invention can effectively reduce the cost of seawater desalination, the energy consumption and the emission of greenhouse gas carbon dioxide, so that the water produce by the system meets the standard of boron content in drinking water, has important significance for energy conservation and emission reduction, and has a very good application prospect.

Description

technical field [0001] The invention belongs to the field of seawater and brackish water treatment, and in particular relates to obtaining a non-inferior solution by performing multi-objective optimization on a reverse osmosis seawater desalination system with a coiled membrane element, while considering water production costs, energy consumption and environmental impact, in order to ensure boron removal Based on the screening rate, the optimization scheme with the highest comprehensive membership degree is obtained. Background technique [0002] Reverse osmosis seawater desalination has gradually become one of the mainstream technologies for international seawater desalination projects due to its mature technology, wide application range, and low energy consumption. The boron content in natural seawater is about 4-6mg / L, and at the usual pH value (7.9-8.2), it is mainly H 3 BO 3 Boronic acid exists in molecular form. The boron removal effect of reverse osmosis membranes ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06F17/50C02F1/44
CPCC02F1/441C02F2103/08G06F30/23Y02A20/131
Inventor 杜亚威刘燕张少峰
Owner HEBEI UNIV OF TECH
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