It is reported that the high-density polyethylene (HDPE) equipment extrusion granulator of Jilin Petrochemical Ethylene Plant has been running for 98 days for the first time, setting a long-term operation record of similar equipment in China.
  The unit adopts the twin-screw extrusion granulator of Germany Kebeilong Company. The continuous operation period of this unit is generally 25 to 30 days.
  In order to extend the continuous operation cycle of the unit, Jilin Petrochemical Ethylene Plant set up a research team to renovate the original hydraulic oil station and add one accumulator to the four accumulators of the original hydraulic oil station to realize the online switching of the unit screen changer. In the 98 days of continuous operation, the unit screen changer realizes two online switching.
  The research team also modified the hot oil pump coupling section of the extrusion granulation unit. They changed the original claw-type elastic block to a diaphragm coupling type, and transformed the bearing housing near the coupling side into a type that can be externally greased. The modification of the coupling extends the service life of the hot oil pump and avoids the unit shutdown.
  In addition, the company developed its own human-machine interface project to change the original alarm to read data directly from the human-machine interface. The new alarm function ensures data integrity and accuracy, and can be randomly added to the alarm according to actual needs. In the case of abnormal conditions of the unit, it is possible to monitor the condition, determine the cause of the stop at the first time, and effectively reduce the incidence of the fault, which provides a strong guarantee for the safe and stable long-term operation of the device.
  After the renovation since October 2018 and related supporting maintenance management, from November 21, 2018 to February 26 this year, the continuous stable running time of the extrusion granulator has increased by more than three times. 
(R-11)