科研之友
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摘要
Vacuum-tube thermal collectors are used to collect heat radiated by the sun. This heat is then used to drive the forced evaporation of concentrated seawater (saltwater) released by reverse osmosis and the extraction of NaCl. This paper reports heat consumption during evaporation. About 78.90% of seawater has to be evaporated in advance through insolation to initiate forced evaporation. This step is conducted to precipitate the NaCl because only CaSO4 center dot 2H(2)O are initially precipitated. Every ton of NaCl produced needs 9260.51 MJ energy and the output of NaCl can increase linearly with an increase in the evaporation ratio. An increase in the evaporating temperature will result in more energy consumption and reduction in the efficiency of the heat utilization. The added heat consumption is mainly used to heat the concentrated seawater. The selected temperature of forced evaporation is 55 degrees C and the water discharge of the vacuum-tube collectors is about 235 m(3)/h. This study proved that salt production from the seawater by utilizing solar assisted forced evaporation is technically feasible.
- 出版日期2015-8
- 单位山西大学
