Reverse osmosis seawater desalination system with two-stage residual pressure recovery and seawater desalination treatment method based on same

Abstract

The invention discloses a reverse osmosis seawater desalination system with two-stage residual pressure recovery, and a seawater desalination treatment method based on the same. The reverse osmosis seawater desalination system comprises a seawater supply pump, a high-pressure pump, two sets of pressure energy exchangers and a membrane component; seawater is boosted by the seawater supply pump to be inputted into the system; high-pressure strong brine transfers pressure energy to a stream of low-pressure seawater in a pressure energy exchanger A, and the seawater transfers the pressure energy to another stream of low-pressure seawater in a pressure energy exchanger B after being boosted. The invention provides the novel reverse osmosis seawater desalination system with two-stage residual pressure recovery, and has the advantages that the pressure energy of the high-pressure strong brine is subjected to two-stage residual pressure recovery through two sets of pressure energy recovery devices, the use of a boost pump is reduced, the water recovery rate of the reverse osmosis seawater desalination system can be flexibly regulated, and the system is compact in structure, flexible to operate, efficient and energy saving.

Description

technical field [0001] The invention belongs to the technical field of seawater desalination, and relates to a two-stage residual pressure recovery reverse osmosis seawater desalination system and a seawater desalination treatment method based thereon. Background technique [0002] The reverse osmosis seawater desalination technology uses a high-pressure pump to pressurize the seawater to reach the required operating pressure, and then passes the pressurized seawater into the reverse osmosis membrane module for osmotic separation, and the desalinated water passing through the reverse osmosis membrane Become product water, but the high-pressure concentrated brine that has not passed through the reverse osmosis membrane is discharged from the system. [0003] Improving the process of reverse osmosis system is an important way to optimize the performance of reverse osmosis desalination system. Specifically, Chinese patent (CN203402976U) discloses a recirculating reverse osmosi...

AI Technical Summary

Problems solved by technology

However, the former does not adopt the residual pressure recovery technology, and the energy utilization rate of the system is still not high; the latter system is more complicated, including booster pumps and other devices, which increases the equipment investment cost and the occupied area of ​​the site

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