Quench tower/settler

- raw materials into the factory, after a ethylene pyrolysis furnace
- once the raw material is broken down into various hydrocarbons and hydrogen, they will immediately reassembled into a larger molecules
- in order to prevent these reactions occur, pyrolysis steam to pass the quench tower, the use of quenching oil or water for cooling.
- the largest water into hydrocarbons by the settler or nasty cold water separation drum (QWSD)

challenge

- the interface is out of control can lead to inefficient operation, rapid cooling tower will reduce ethylene production.
- with the increase of raw material, need more cooling fluid
- cracking of hydrocarbons in the sojourn time of settler must reduce as far as possible, in order to maintain its components and prevent the secondary reaction.
- quenching settler or QWSD from capture liquid hydrocarbon and water quench tower and form an interface in the QWSD, if you add too much etchant may form emulsion layer.
- the interface measurement for urgent cold water from a new cycle is very important to the tower, sedimentation value and hydrocarbons can't recycle, this will reduce the production efficiency, and can cause pollution of the equipment;This also applies to quench oil, and the interface between the tar and other heavy hydrocarbon measurement.
- if negative changes have taken place in the fluid composition in the quench tower, then from the raw material to produce ethylene would be reduced, thus reducing the efficiency and productivity.
- if you use water to quench, adjust the interface level also helps to use fewer etchant.