Method for optimizing flow distribution part two-stage type design spiral membrane element reverse osmosis seawater desalination system considering boron removal

Abstract

The invention discloses a method for optimizing a flow distribution part two-stage type spiral membrane element reverse osmosis seawater desalination system considering boron removal. According to the method, an accurate model of a reverse osmosis seawater desalination transfer mechanism considering boron removal is established in a strict mechanism mode. The flow distribution part two-stage design is introduced; by utilizing a characteristic that the yield and quality of producing water at the front end of a pressure container are higher than those of producing water at the back end of the pressure container, the producing water at the front end of the pressure container is directly conveyed to final producing water and the producing water at the back end enters a next stage to be treated again; and a flow adjustment valve is added, so that the ratio of outlet water at the two ends can be flexibly adjusted according to an actual condition. A superstructure model of the reverse osmosis system is established, the changes of saline water pressure, concentration and flow in an axial direction of the pressure container as well as the salinity rise caused by saline water mixing in a worker exchange are considered, operation condition constraints are added for ensuring the system to run safely, and a simultaneous solution technology is adopted for solving optimization systems. The method comprehensively considers the influences of various factors on the seawater desalination system to further reduce the water producing cost and energy consumption of seawater desalination and enable the producing water of the system to meet the boron content standard of boron in drinking water. Not only can the reverse osmosis system be designed but also operation parameters can be optimized in a system operation process, so that the method has very good application prospects.

Description

technical field [0001] The invention belongs to the field of seawater and brackish water treatment, and specifically relates to a reverse osmosis seawater desalination system by optimizing a coiled membrane element, so that the water production cost of the system can be minimized on the basis of ensuring the boron removal rate. Background technique [0002] Seawater desalination technology is one of the effective ways to solve the shortage of fresh water resources, and has become a reliable industrial technology after decades of development. At present, the most widely used methods in engineering can be divided into distillation and reverse osmosis. Reverse osmosis has gradually become the first choice for international seawater desalination projects due to its mature technology, wide application range, and continuous reduction in energy consumption. However, the boron removal effect of reverse osmosis membrane on seawater is not ideal, and the high boron content in the pro...

AI Technical Summary

Problems solved by technology

However, the existing studies on the optimization of reverse osmosis systems seldom consider the influence of boron removal on the optimal design of the system.

Due to the chemical balance of boron in seawater, which increases the complexity of its transfer process, the research on the system optimization of boron removal by reverse osmosis is still in its infancy

Although the effects of seawater temperature, pH value, and boron content requirements in the produced water on boron removal in reverse osmosis systems have been considered in some optimization studies, the boron removal in their models is expressed by a simple numerical fitting relationship, which does not guarantee its transfer model accuracy

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