海水淡化自增壓式能量回收裝置的性能研究及放大化設(shè)計.pdf

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3、月 日 簽字日期：年 月 日 ABSTRACT Energy Recovery Device (ERD) can reduce the specific energy consumption and cost of permeate，which is the key equipment of membrane desalination system. Positive displacement (P

4、D) ERD is the main body of popularization and application. Based on the Fluid-Switcher Energy Recovery Device (FS-ERD), this paper introduces a self-boost energy recovery device (SB-ERD). The pressure-differential hydrau

5、lic cylinder has replaced the original hydraulic cylinder, which reduces the cost of equipment investment and simplifies the system process. A self-boost energy recovery device (SB-ERD) is firstly introduced, and the str

6、ucture characteristics and working principle of the SB-ERD are introduced in detail. Then apply it to a nanofiltration seawater desalination system. The performance of ERD and energy-saving contribution are tested and ev

7、aluated in the nanofiltration seawater desalination system. The coupling of SB-ERD and nanofiltration desalination unit is studied under the pressure of 1MPa, 1.5MPa and 2MPa. The results indicate that the step-up ratio

8、is 1.19, the maximum pressure fluctuation of high pressure brine is 0.06MPa, the energy recovery efficiency reached up to 92.3％ under the operating pressure of 1.00MPa. The step-up ratio is 1.19, the maximum pressure flu

9、ctuation of high pressure brine is 0.17MPa, the energy recovery efficiency reached up to 96.5％ under the operating pressure of 1.5MPa. The step-up ratio is 1.20, the maximum pressure fluctuation of high pressure brine is

10、 0.24MPa, the energy recovery efficiency reached up to 98.7％ under the operating pressure of 1.00MPa. Comparative analysis of the energy consumption of the nanofiltration desalination system with SB-ERD and with FS-ERD i

11、s studied under the pressure of 1MPa, 1.5MPa and 2MPa. The SB-ERD keeps good energy-saving contribution. The reductions of energy consumption are 0.062kW, 0.088kW and 0.081kW respectively. The nanofiltration desalination

12、 system coupled with SB-ERD not only reduces the cost of equipment investment and simplifies the system process, but reduces the energy consumption of the system in a way. To study the flexibility of the SB-ERD coupled i