Reliable and efficient, Olmi secondary and tertiary quench exchangers cool gaseous cracked effluent from the primary quench exchanger while generating saturated steam or heating-up boiler feed water. As a trusted equipment and service provider to the ethylene industry, Alfa Laval optimizes quench exchangers along with ancillary items, such as steam drums and piping, for continuous uptime and maximum ethylene productivity and yield.
Optimizing secondary and tertiary quench processes for ethylene production
Alfa Laval can supply complete quench systems constituted of primary, secondary, tertiary quench exchangers and steam drums. Alfa Laval Olmi secondary and tertiary quench exchangers (SQEs and TQEs) are mainly based on the same proven and reliable design concepts of Olmi S&T primary quench exchangers.
Superior technology, unmatched quality, durable materials and advanced welding enable these shell-and-tube heat exchangers to provide unequalled operational reliability. This contributes to improved energy recovery and steam generation as well as increased productivity and yield.
Versatile, thin and flexible tubesheet design
To handle process demands, Olmi secondary quench exchangers feature thin and flexible tubesheets for
low operating metal temperatures and flexibility. As a result, tubesheet is efficiently cooled and local thermal-mechanical stresses across tubesheet thickness are greatly reduced. Also thermal differential elongation stresses between hot tubes and cold shell are efficiently absorbed.
When required, an anti-erosion weld overlay in high-nichel alloy is used to protect the hot tubesheet. Tubesheets, flexible knuckles and tube joint hubs are made from single forging, which guarantees high quality. Tubes are welded to hot and cold tubesheets using internal bore welds and crevice-free welds, respectively.
Depending on operating conditions, a special layout for water distribution and steam collection may also be applied.
Depending on the operating conditions and dimensions, Olmi tertiary quench exchangers can be designed either with thin and flexible tubesheets like the secondary quenchers, or with thick standard tubesheets.
Differential thermal expansion between tubes and shell is dramatically reduced due to highly efficient cooling of hot parts and smart design adopted. The thin tubesheet is sufficiently flexible to eliminate possible problems with fatigue and cracks.
Olmi secondary and tertiary quench exchangers are available in a wide range of materials – from carbon and stainless steels to special alloys. To maximize your equipment service life and minimize maintenance requirements, Alfa Laval engineers can advise you on the most appropriate materials to use based on your specific operating conditions.