Refinery vacuum units include a deentrainment, or wash zone, for removal of heavy material from desired products. Wash zone reliability problems often shut vacuum units down, causing significant losses. The review of wash zone operations cover;
Operating objectives
Fractionating versus deentraining wash zones
Wash zone terminology
Operating configurations
Hot-wash versus cold-wash
Wash oil distributors
Conventional configurations
Spray chambers
Multiple stage wash systems
Recycle wash systems
Wash zone modeling and reliability
Elements of case studies from multiple units are included to illustrate key points.
