The Absorption Behavior Of SO₂ In Seawater Systems

As one of the most important areas of seawater utilization, seawater flue gasdesulfurization (SW FGD) has widely developing foreground. Researchers oversea shave studied the SW FGD deeply, but there has comparative less research on SW FGDand short of base data in China. Nowadays, there have been 3 power plants usedforeign SW FGD technology to get ride of SO2 in flue gas in the domain, but no SWFGD equipments of independence knowledge property right has been used in industryapplication.Recently, seawater desalination has developed rapidly in China, and produced lotsof concentrated seawater as outgrowth, which has limited ways to dispose of.Concentrated seawater will influence the entironment if it could not be disposedof properly. The way to utilizing concentrated seawater need to be developed.Thought of utilizing concentrated seawater to absorb SO2 in flue gas has beencreatively put forward in this paper during studying on the SW FGD mechanism. A SO2 absorption appraising system was constructed. The capability of seawater,concentrated seawater and underground brine along Laizhou Bay absorbing SO2 hasbeen measured, and draw to such conclusion as follows:(1) Solubility of SO2 in seawater reduces quickly with the temperature increasing;Solubility of SO2 in seawater reduces with dilute times increase; temperaturechange influence on solubility of SO2 is more prominently to diluted seawater.(2) Concentrated seawater has better capability of absorbing SO2 than seawater at30,50 and 80℃.(3) Underground brine along Laizhou Bay has better capability of absorping SO2than seawater at 30,50 and 80℃in 60 minutes. The solubility of SO2 droppedrapidly with absorbing time increase.(4) Concentrated seawater has the best capability of absorbing SO2 among seawater,concentrated seawater and underground brine along Laizhou Bay at 30,50 and80℃.Result shows that temperature, alkalinity and salinity of seawater system getdistinct influence on capability of absorbing SO2. This study provides theorysupport of utilizing concentrated seawater replace of seawater to industrydesulfurization., and the shortcomings of low SO2 capacity, high cost can beresolved partly. It is a new way for concentrated seawater utilization.