2 replies to this topic

[nybrla]

Greetings,

 

What is the best heat exchanger type to replace an antiquated box cooler, a system in which hot resid is cooled by flowing through coils that are submerged in an open tub of cooling water? To prevent hot resid from excessively cooling and plugging the coils, the water bath is maintained at an elevated temperature.

 

We use such a system to cool atmospheric and/or vacuum resids from above 500 deg F to about 200 deg F during emergency unit upsets or startup/shutdown conditions when hot resid must be sent directly to storage.

 

Air coolers vs. closed loop tempered water coolers (tempered water cooled with air coolers) are discussed. What are some of key advantages and disadvantages of each? Are there any other system we should consider? Required duty is very large at about 100 MMbtu/hr which would make any system very expensive.

 

I appreciate your valuable input. Thank you.

[Zauberberg]

Tempered system is what works well in reality. Water system is more robust and with much smaller footprint. Air systems are more vulnerable.

[gegio1960]

I agree with Dejan