太阳能利用的多级闪蒸海水淡化装置热力过程计算
毕业论文关键词：多级闪蒸; 海水淡化; 太阳能; 传热
Abstract With the rapid development of economic society, the human demand for fresh water is greater and greater, and the water shortage problem becomes increasingly serious, which has been restricting the development of some national economy and the improvement of people's living standards. Because the seawater resources are rich and widely distributed, developing seawater desalination industry is an effective measure to solve the problem. Traditional technologies of desalination are mature, but energy consumption is large, and the production cost is high, so there are some problems in the promotion, especially in those energy shortage area. Multi-stage flash desalination device operation is stable and reliable, and water product is in good quality, but energy consumption is large, so solar heat utilization technology is applied to mul ti-stage flash desalination, which is practical significant. On the one hand, it can reduce the energy consumption and save production cost; On the other hand i t can reduce the pollution caused by the burning of fossil fuels. In this paper, theory analysis for based on solar energy using mul ti-stage flash desalination device has been carried out. According to the conservation of energy and mass, some basic process parameters have been worked out with the first law of thermodynamics and heat transfer theory, such as device running seawater flow, operating temperature and pressure of each stage, fresh water production, condensing tube heat transfer acreage and feed water in the outlet temperature of condenser pipe at each stage. Thus device heat demand is got. In this article，according to the intensity of solar radiation and the device heat demand, the type of solar collector is selected and determine quantity of the collector. Based on the thermodynamics parameters calculation of solar energy multi-stage flash desalination device, this paper provides reference for structural design or optimal design of the device in future. And the device could relieve the problem of fresh water shortage in coastal areas.
Keyword: multi-stage flash ; seawater desalination ; solar energy ; heat transfer.
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