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Operation optimization method of shunting part two-stage spiral-wound membrane element reverse osmosis seawater desalination system

An optimization method, reverse osmosis technology, applied in chemical instruments and methods, osmosis/dialysis water/sewage treatment, seawater treatment, etc., can solve the problem of not considering the impact of the secondary design of the shunt part, etc.

Active Publication Date: 2021-04-02
HEBEI UNIV OF TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the existing research has not considered the impact of the secondary design of the shunt part and the on / off mode on the system operation

Method used

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  • Operation optimization method of shunting part two-stage spiral-wound membrane element reverse osmosis seawater desalination system
  • Operation optimization method of shunting part two-stage spiral-wound membrane element reverse osmosis seawater desalination system
  • Operation optimization method of shunting part two-stage spiral-wound membrane element reverse osmosis seawater desalination system

Examples

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example 1

[0200] Example 1, 100 and 30 pressure vessels are used for the primary and secondary reverse osmosis respectively, and 8 membrane elements are placed in each pressure vessel, and the salinity of the feed seawater is 35kg / m 3 , the temperature is 20℃, the water supply plan of product water 1 and product water 2 is attached image 3 As shown, in this case, the optimization problem is solved, and the traditional optimization, the secondary part of the shunt part, the second level of the shunt part and the on / off mode (shunt+on / off) scheme are optimized respectively. The results are shown in Table 4 and attached Figure 4 to attach Figure 11 shown.

[0201] Table 4 Optimization results of constant seawater temperature and product water demand change

[0202] traditional optimization split part secondary Shunt+On / Off System average feed flow rate [m 3 / h]

806.3 801.9 716.8 Total energy consumption of the system [kW] 2214.3 2111.9 1955.5

...

example 2

[0205]Example 2, 100 and 30 pressure vessels are used for the primary and secondary reverse osmosis respectively, and 8 membrane elements are placed in each pressure vessel, and the salinity of the feed seawater is 35kg / m 3 , the water supply plan changes of feed seawater temperature, product water 1 and product water 2 are shown in the attached image 3 As shown, in this case, the optimization problem is solved, and the traditional optimization, the secondary part of the shunt part, the second level of the shunt part, and the on / off mode (shunt+on / off) scheme are optimized respectively. The results are shown in Table 5 and attached Figure 12 to attach Figure 16 shown.

[0206] Table 5 Optimization results of changes in seawater temperature and product water demand

[0207] traditional optimization split part secondary Shunt+On / Off System average feed flow rate [m 3 / h]

786.7 777.6 705.3 Total energy consumption of the system [kW] 2140.3 ...

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Abstract

The invention discloses an operation optimization method of a shunting part two-stage spiral-wound membrane element reverse osmosis seawater desalination system. A mathematic model of a reverse osmosis transfer mechanism and a mathematic model of a shunting part secondary reverse osmosis system comprising a water storage tank are established by adopting a strict mechanism mode, and changes of saline water pressure, concentration and flow along the axial direction of a pressure container and salinity rise caused by saline water mixing in a power exchanger are considered; the change of the waterlevel and salinity in the water storage tank along with time is considered, operation condition constraints are added to ensure safe operation of the system, and an operation optimization problem issolved by taking system energy consumption and water taking as target functions and adopting a simultaneous equation technology; a water production shunt proportion and an on / off mode are adjusted, the optimized operation scheme considering the water production demand change and the water inlet temperature change is obtained, the energy consumption of the seawater desalination system is further reduced, a theoretical basis and a technical reference can be provided for pilot plant test and industrial application, and the method has a good application prospect.

Description

technical field [0001] The invention belongs to the field of seawater and brackish water treatment, and in particular relates to reducing energy consumption in the operation process by optimizing the operation of a reverse osmosis seawater desalination system with a secondary roll-type membrane element in the diversion part. 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. Reverse osmosis, also known as reverse osmosis, is a membrane separation operation that uses pressure difference as the driving force to separate the solvent from the solution. Apply pressure to the feed liquid on one side of the membrane. When the pressure exceeds its osmotic pressure, the solvent will permeate against the direction of natural permeation. Thus, the permeated solvent is obtained on the ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F1/44G06F30/23C02F103/08
CPCC02F1/441C02F1/008G06F30/23C02F2103/08Y02A20/131
Inventor 杜亚威邓会宁刘燕张少峰
Owner HEBEI UNIV OF TECH