Experimental study on the performance of multi-stage reverse electrodialysis based on LiCl-NH4Cl aqueous solution
Compared with single-stage reverse electrodialysis,multi-stage reverse electrodialysis(MSRED)has more advantages in the output power of reverse electrodialysis heat engine,because it can convert more salinity gradient energy into electricity.In order to further improve the output power of MSRED,the total net output power of the device when used as the MSRED working solution was compared between the previously developed LiCl-NH4Cl aqueous solution(mass molar ratio of 2:8)and the traditional NaCl aqueous solution.The parameters include current density,initial molality concentration of feed solution and the flow velocity of feed solution.The results show that MSRED with LiCl-NH4Cl aqueous solution can achieve higher current output,and the total net output power of MSRED can be increased by up to 28.6％compared with that of NaCl aqueous solution with the same mass molar concentration.In addition,no matter how the relevant operating parameters change,the MSRED using LiCl-NH4Cl aqueous solution can obtain higher total net output power than that of NaCl aqueous solution with the same mass molar concentration.At the same time,the number of stacks employed in the system is smaller,which can save equipment costs and reduce the volume of the device.
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