Method for using energy of acetic acid device

The invention relates to a method for using energy of an acetic acid device. Through the method, the problems that reaction heat is not recycled and the energy is unreasonably used in the prior art can be mainly solved. According to the technical scheme well solving the problems, the reaction heat is recycled through external recycle stocks of a reactor; the recycled reaction heat generates low-pressure saturated steam; the generated low-pressure saturated steam leads to a refrigeration unit to prepare refrigerated water; the prepared and refrigerated water serves as cooling mediums of a top heat exchanger of a carbonyl synthesis unit reactor, a top heat exchanger of a light component tower of a refined separation unit and an absorbent heat exchanger of a tail gas recovery tower of a tail gas recovery unit. The method for using energy of the acetic acid device can be applicable to industrial production of acetic acid synthesis through methyl alcohol carbonylation.