2 replies to this topic

[Light]

We know that the linde cycle is widely used for the liquefaction of gases like nitrogen and oxygen. This cycle utilises a throttle valve to achieve the liquefaction of the gas by joule-thompson expansion. However, throttling is an irreversible process and such processes are not energy efficient. On the other hand, the claude cycle utilises a turdo-expander in which isentropic expansion takes place which results in the cooling and subsequent liquefaction. This provides additional work for the system and is much more energy efficient than the throttling process. 

 My question is that why is the linde cycle still used widely in the industry inspite of the obvious advantages of the claude process?

  I am new to this topic, so if I have written something inappropriate please pardon my lack of knowledge.

Edited by samkha, 13 December 2013 - 12:53 AM.

[Art Montemayor]

Please read past threads on air liquefaction in our Forums.  You can access these threads by using our SEARCH engine and the key words air liquefaction.

 

There is no clear definition between the Linde and Claude “cycles”.  It depends in what area of the process you are referring to.  The main difference between both is only in the manner that you obtain the cryogenic cold and subsequent liquefaction.  A Claude expansion engine still requires a certain amount of by-passed high pressure air to go through an expansion valve for free adiabatic expansion.  It also employs a double column for air separation.  You are correct in presuming that the Claude expansion engine with its isentropic feature is to be preferred for gas liquefactions.  The reason for this is because of the obvious energy savings and efficiency.  But all is not perfection.  An adiabatic, isenthalpic expansion is still required for vernier adjustments and control of the process.

 

[Light]

Thanks a lot sir!