Heating medium system for intermittent polyester

The utility model relates to a temperature rising and falling heating medium system for intermittent polyester, which comprises a reaction kettle and a heating medium circulating pump, a reaction kettle coil pipe is arranged in an inner cavity of the reaction kettle, a reaction kettle jacket is arranged on the periphery of the reaction kettle, and a high-temperature heating medium supply pipe is connected with an inlet pipe of the heating medium circulating pump through a high-temperature heating medium feeding regulating valve. An outlet pipe of the heating medium circulating pump is connected with the reaction kettle coil and the reaction kettle jacket, and a heating medium outlet pipe of the reaction kettle is connected with the high-temperature heating medium return pipe through a heating medium switch valve, a heating medium regulating valve and a high-temperature heating medium return valve; the reaction kettle heating medium outlet pipe is also connected with a heating side inlet of a heating medium co