HDH System Performance Analysis And Humidifier Performance Experimental Study

Humidification and dehumidification(HDH)seawater desalination technology has the characteristics of flexible scale,small investment,suitable for decentralized fresh water demand and easy integration with low-grade energy,and has attracted widespread attention from researchers.In this paper,the humidification and dehumidification system for theoretical calculations is constructed.Based on the principles of energy conservation and mass conservation,a mathematical model of the humidification and dehumidification system is established.When the spray liquid flow is 0.058kg/s,the spray liquid flow rate,spray liquid temperature,air flow rate,cooling water flow and cooling water temperature on the water production and GOR was studied.When other conditions remain unchanged,as the temperature of the spray liquid increases,the system water production,electric heater power and GOR increase;The system water production first increases with the increase of the cooling water flow rate,and then tends to stable.The water output decreases with the increase of the cooling water temperature,and the GOR increases with the increase of the cooling water temperature.The orthogonal analysis method was used to sort the influence of different parameters on water production and GOR,and the best operating point corresponding to the system water production and GOR was found.The best operating point corresponding to the system water production is the spraying liquid flow rate 0.050kg/s,the spraying liquid temperature 80°C,the air flow rate 0.0148kg/s,the cooling water flow rate 0.05kg/s,and the cooling water temperature 20°C.The best operating point corresponding to GOR is spraying liquid flow rate 0.050kg/s,spraying liquid temperature 80°C,air flow rate 0.0180kg/s,cooling water flow rate 0.02kg/s and cooling water temperature 22°C.The spray flow rate has the greatest impact on water production and the spray temperature has the greatest impact on GOR.Building a humidifier performance test experimental platform,and studyding the spray liquid flow rate,spray liquid temperature,air flow rate,sieve plate aperture size,sieve plate with or without riser and the number of sieve plates on humid air temperature and evaporation.The results show that the temperature of the spray liquid and the flow rate of the spray liquid increase,the air temperature,moisture content and evaporation of the humidifier all increase.The air flow increases,when the air flow increase range is greater than the decrease of the moisture content,the evaporation capacity and the evaporation capacity of the air side increases.Vice versa,the evaporation capacity decreases.When the liquid flow rate is0.025kg/s,the humidifier outlet humid air temperature and the evaporation capacity are the highest with using a 3.0mm hole.Under other flow conditions,when the sieve plate with a hole diameter of 2.5mm and a hole spacing of 7.5mm is used,the outlet humid air temperature and the evaporation rate is the highest.The temperature of the outlet moist air without riser is higher than when there is a riser.The evaporation is also greater than when there is a riser.The humid air temperature at the outlet of the humidifier and the evaporation with double-layer orifice plate is higher than that of the single-layer orifice plate.