離網(wǎng)型風(fēng)光互補(bǔ)膜法海水淡化系統(tǒng)的優(yōu)化設(shè)計(jì)
[Abstract]:In recent years, countries around the world have accelerated the development of coastal islands in order to make use of marine resources. Because most of the islands developed are far from the mainland and lack of municipal electricity and fresh water supply, most of them now use ships to transport fresh water or desalination by diesel engine to obtain fresh water, which not only increases development costs but also pollutes the island's environment. With the increasing maturity of wind and solar power generation technologies, the use of renewable energy to provide green power for desalination equipment can solve the freshwater supply problem of remote islands. At present, many research institutions at home and abroad are studying the combination of wind energy, solar energy and seawater desalination in order to obtain the double benefits of green power and fresh water supply. Due to the large fluctuation of wind and solar power generation, the electricity generated by wind and solar energy is usually stored in the storage battery, and then the battery is used to supply electricity to the membrane desalination plant. Because of the large power of membrane desalination unit, it is necessary to configure large capacity battery pack, which not only increases the cost of system investment, but also produces a large amount of power loss during the charge and discharge process of large capacity battery pack. It leads to the low efficiency of off-grid wind-wind complementary membrane desalination system. This paper introduces the structural characteristics and main technical parameters of horizontal wind turbine and vertical wind turbine, as well as the design essentials of solar photovoltaic power station, which provides the basis for the design of the power supply module of off-grid wind-wind complementary membrane seawater desalination system. The technological process of membrane seawater desalination is described, and the technical parameters of the key components of membrane seawater desalination device are analyzed, which lays a foundation for the design of membrane seawater desalination unit. According to the seawater water quality, wind and solar energy resources in Xiamen area, the pretreatment module, high pressure pump, reverse osmosis membrane module and post-treatment module of 1t membrane desalination unit are designed. The energy consumption of 1 t membrane desalination unit is analyzed, and the capacity of solar photovoltaic module and wind power module is designed. A power buffer balance controller is developed, which can monitor the power of the generator in real time and allocate the charge and discharge of the small capacity battery, and solve the problem of the power fluctuation of the wind and wind complementary power supply module through the wind and wind complementary power generation and the small capacity battery power supply. To ensure the steady operation of the membrane desalination unit at constant power. The test platform of 1 t wind-wind complementary membrane seawater desalination system was set up to test the performance of power generation unit, power buffer balance controller and desalination device under different climatic conditions. The experimental results show that the balance controller can effectively solve the power fluctuation of wind-wind complementary generation, ensure the safe and stable operation of membrane desalination device under various climatic conditions, and reduce the number of charge and discharge of small-capacity battery. Because of the frequent climate change, the operating time of the system can not be fixed, and the operation of the system is complicated through the manual monitoring system, and the energy consumption of the system is much higher than that of the high-pressure concentrated seawater desalinated by membrane method without the energy recovery of the high-pressure concentrated seawater. In view of the complicated situation of manual manipulation exposed during the experiment, according to the technological process of membrane seawater desalination, the automatic transformation of the test platform of the seawater desalination system was carried out, and the automatic operation of the system was realized. In view of the large energy consumption of the fresh water produced by the system, the energy recovery calculation of the high pressure concentrated seawater discharged is carried out. It is proposed that the energy recovery device be added to the medium-sized wind-wind complementary desalination system to effectively reduce the unit energy consumption of the fresh water production.
【學(xué)位授予單位】:集美大學(xué)
【學(xué)位級(jí)別】:碩士
【學(xué)位授予年份】:2016
【分類號(hào)】:P747
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