Analysis of energy and water conservation in hydrogen production by alkaline electrolysis of water
WANG Zhengyang
CHEN Xiaolei
LIN Xiang
CHENG Feng
Abstract：Taking the alkaline electrolytic water hydrogen production system with a hydrogen production capacity of 1 000 m3/h as the research object,according to the process characteristics of alkaline electrolytic water hydrogen production,the energy balance and material balance of the system are analyzed,and then energy-saving and water-saving measures are proposed.The results show that when the hydrogen production is 1 000 m3/h,the electrolytic voltage of the small chamber is 1.9 V,the operating pressure is 1.6 MPa,the working temperature is(85±5)℃,the purity of hydrogen at the outlet of the electrolytic cell is≥99.8%,the purity of oxygen is≥98.5%,the thermal efficiency is 77.89%,and the corresponding theoretical electrolytic water consumption is 804 kg.The actual water consumption is 845 to 880 kg.Reducing the electrolytic voltage of the small chamber and the utilization of low-temperature waste heat are effective means to improve thermal efficiency.The water consumption can be reduced by lowering the exhaust temperature at the outlet and recovering the discharged separated wastewater.
Keywords：hydrogen production by electrolyzing wateralkaline electrolytic cellenergy balancematerial balanceenergy-saving and consumption reduction
Publication Date：2025-06-25
Online Publishing Date：2025-09-01(First online date of this platform, not the publication date of the document)
Pages：4( 55-58 )