聚酯装置的乙二醇采用全回用设计。在真空系统中，回用乙二醇中经常夹带低聚

The ethylene glycol of the polyester plant adopts a full-recycling design. In the vacuum system, oligomers are often entrained in the recycled glycol. Although there is a filtration system, the small particles of oligomers entrained in the recycled glycol will stick to the inner wall of the glycol pipeline after long-term operation. In order to increase the pipeline resistance, it is necessary to increase the lift of the glycol delivery pump as a last resort. Now the project has adopted the thermal cleaning of the glycol circulation system as a standard configuration, and the oligomers on the glycol circulation pipeline can be cleaned online regularly without stopping. Therefore, the glycol in the polyester device can be used. The head of the circulating pump is greatly reduced. At present, large-flow, high-lift centrifugal pumps are still used for supporting glycol circulating pumps in the project, which causes a certain amount of waste of electrical energy. If the vacuum circulating glycol circulating pump is optimized and selected, it is expected that the motor power of the circulating pump can be saved by about 25kW.

Ethylene glycol in polyester devices is fully reused. In the vacuum system, the reuse of ethylene glycol is often clamped with oligomer, although there is a filtration system, but after long-term operation, the return of glycol in the clip of small particles of oligopolymer will adhere to the inner wall of the glycol pipeline, so that the pipeline resistance increases, it is imperative to improve the lead of the glycol delivery pump. Now the project has been the heat cleaning of glycol circulation system as a standard configuration, can regularly clean the ethylene glycol cycle line in the absence of parking, low polymer, therefore, can make the polyester device in the ethylene glycol circulation pump head greatly reduced. At present, the project supporting glycol cycle pump is still using high flow, high head centrifugal pump, resulting in a certain waste of electrical energy. If the vacuum cycle glycol cycle pump is optimized, it is expected that the circulating pump motor power can save about 25kW.

Ethylene glycol in polyester plant is designed to be fully recycled. In the vacuum system, oligomers are often carried in the recycled ethylene glycol. Although there is a filtration system, the small particle oligomers carried in the recycled ethylene glycol will adhere to the inner wall of the ethylene glycol transmission pipeline after long-term operation, which will increase the resistance of the pipeline, so it is necessary to increase the head of the ethylene glycol transmission pump. Now the thermal cleaning of ethylene glycol circulation system has been taken as the standard configuration in the project, and the oligomer on the ethylene glycol circulation pipeline can be cleaned on-line regularly without shutdown. Therefore, the head of ethylene glycol circulation pump in the polyester plant can be greatly reduced. At present, the large flow and high lift centrifugal pump is still used in the project, resulting in a certain waste of electric energy. If the vacuum circulating glycol circulating pump is optimized, it is expected that the motor power of the circulating pump can be saved about 25kW.<br>