Abstract:

The fluid catalytic cracking unit(FCCU)in oil refinery often suffered the production interruption accidents in case of running out of control of static blade adjustable actuator for axial-blower, and the actuator locking problem with the higher probability can cause the state of dangerous failure, which pose a serious threat to the unit operation and production process. The low reliability for running of main blower and poor safety level of production process mainly suffered the special valve and its electro-hydraulic control systems problems such as plugging, floating, jamming and poor intellectualization. Based on the principle of reliability design and fault bionics self-recovery, one smart electro-hydraulic control system which characterized with the functions such as self-diagnosis and self-recovery is developed and a multiple therapy targets fault self-recovery regulation method for electro-hydraulic control system is proposed. The method overcomes the defects of traditional electro-hydraulic control system which heavily depends on artificial fault diagnosis and repairment. Based on DCS/SIS platform, an fault self-recovery regulation system of the electro-hydraulic control system on main blower static blade adjustable actuator is developed and the smart electro-hydraulic control system with fault self-recovery function is applied in the main blower static blade adjustable actuator, and the result shows that the function of fault self-recovery for special valve position locking or running of control comes true and the reliability of axial-blower is dramatically promoted.

Key words: electro-hydraulic control, fault self-recovery regulation, reliability, static blade adjustable actuator