Reverse osmosis membrane and pump integrated seawater desalination unit

Abstract

The invention provides a reverse osmosis membrane and pump integrated seawater desalination unit. The unit comprises a motor, reverse osmosis membrane groups, a high-pressure seawater pump and a freshwater collection pipeline, the high-pressure seawater pump comprises a pump shell, a main shaft, a supercharged scroll structure, a pressure-compensating scroll structure and en energy recovery scrollstructure, the supercharged scroll structure is configured to receive raw seawater and pressurize the raw seawater step by step under the driving of the main shaft in order to provide high-pressure seawater to the reverse osmosis membrane group, the pressure-compensating scroll structure is configured to compensate pressure for the reverse osmosis treated seawater and supply the seawater to a next-stage reverse osmosis membrane group, and the energy recovery scroll structure is configured to receive high-pressure concentrated brine from the reverse osmosis membrane groups, convert the pressure energy of the high-pressure concentrated brine into the kinetic energy of the main shaft and produce low-pressure concentrated brine. The unit has the advantages of integration of the functions of supercharging, reverse osmosis, pressure compensation and energy recovery, reduction of the energy consumption, compact structure, small occupied land area, high water production efficiency, few failure points, easiness in maintenance, and long service life of the reverse osmosis membrane groups.

Description

Technical field: [0001] The invention relates to the technical field of fluid mechanical engineering, in particular to a novel structure reverse osmosis membrane pump integrated seawater desalination unit. Background technique: [0002] At present, almost all seawater desalination processes in China use reverse osmosis membranes to work in series, and occasionally new reverse osmosis membrane integrated purification systems use reverse osmosis membranes to work in parallel. But no matter what kind of reverse osmosis purification equipment is used, it is necessary to configure a high-pressure pump at its inlet to provide the osmotic pressure demand of the reverse osmosis membrane in the reverse osmosis purification equipment. However, there are many disadvantages of reverse osmosis purification equipment with high pressure pumps as follows: [0003] The old-fashioned reverse osmosis membranes work in series and configure high-pressure pump technology: occupy a large area, an...

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Problems solved by technology

[0003] The old-fashioned reverse osmosis membranes work in series and configure high-pressure pump technology: occupy a large area, and the capital investment cost is high; the pressure inside the reverse osmosis membrane decreases step by step, the water output of the permeable membrane decreases step by step, and the separation efficiency is low; the utilization rate of the reverse osmosis membrane varies , and its service life varies; these reverse osmosis membranes are all embedded in the same protective tube, which is not conducive to monitoring and maintenance

[0004] The new reverse osmosis membrane integrated purification system is equipped with high-pressure pump technology: Although there are two sets of step-by-step booster impellers, the internal pressure of the system increases with the increase of the osmotic pressure required by the reverse osmosis membrane, and the water output of the reverse osmosis membrane remains almost the same, and the separation efficiency is high ; The utilization rate of the reverse osmosis membrane is almost equal, and its service life remains the same; the reverse osmosis membrane is independent, which is convenient for monitoring and maintenance, but it occupies a slightly larger space; the high-pressure pump and reverse osmosis membrane integrated purification system are equipped with motor drive , the difficulty of circuit wiring increases, and to a certain extent increases the difficulty of automatic control of the system; the existence of high-pressure pumps increases the number of hidden fault points; the drive motors of high-pressure pumps and reverse osmosis membrane integrated purification systems are independent of each other, which is not conducive to energy integration Utilization; the overall system is complicated, which is not conducive to overhaul and maintenance

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