The PLC control system ,electrical heated circuit and work preciple of improved electrical heated air-dryer are introduced. The practice showed that the improved system is more effective and reliable.

• 介绍了改进的电加热气体干燥装置的工作原理、PLC控制系统和主辅电加热回路的构成，应用实践表明改造后的系统工作可靠性明显提高。