This paper introduces the design concept of double closed-loop ratio control system as well as the design and the application about acetylene with hydrochloride in chloroethylene synthesis unit.

• 介绍了双闭环比值控制系统的设计思路以及在氯乙烯合成装置中乙炔和氯化氢比值控制系统的设计和应用,以及在设计比值控制系统时所应注意的有关事项。