Optimization Of Adsorption/Desorption Seawater Desalination System

At present,the shortage and uneven distribution of freshwater resources have become an important problem to be solved urgently.As an important technology to solve the shortage of freshwater resources fundamentally,seawater desalination technology has been developed rapidly.Adsorptive desalination technology,which can utilize renewable energy such as solar energy,geothermal energy or industrial waste heat,has become a new direction for the development of desalination technology.The problems existing in the original experimental device and the experimental operation scheme was optimized and reformed.It was optimized by optimizing steam pipeline,increasing heat transfer area of falling film evaporator and improving operation scheme.An experimental study on the setting of basic operating conditions and different off-design conditions was carried out.At the same time,four indexes of water yield per unit time,the regenerative efficiency,SDWP(Specific Daily Water Production)and PR(Performance Ratio)of the system under different operating conditions were analyzed.In addition,freshwater produced by this equipment is tested and compared with standard.Under the basic working conditions,the water yield of the optimized experimental device reaches 7.66 kg/h,which is 34.4% higher than 5.7 kg/h of the original experimental device,and the performance parameter SDWP is 6.29 tons of water/(ton of silica gel per day),which is 34.1% higher than that of the original experimental device at 4.69 tons of water/(ton of silica gel per day).The PR is 0.76,which is 8.6% higher than that of the original experimental device,and the effect of heat recovery is 79.4% higher than that before the modification.With the increase of hot water temperature,hot water flow,cooling water flow,seawater flow and seawater temperature,the water yield and SDWP in unit time of the system increase gradually.The PR increases with the increase of cooling water flow rate,seawater flow rate and seawater temperature,and decreases with the increase of hot water temperature and flow rate.The effect of heat recovery ? decreases gradually with the increase of hot water temperature.In addition,besides the content of volatile phenols in freshwater produced by the detection system exceeded the standard,all other main detection indicators met the requirements of "Sanitary Standard for Domestic Drinking Water"(GB 5749-2006).