Fire case - Latent heat for multicomponent system
Fire case - Latent heat for multicomponent system
(OP)
Hello,
Im currently sizins RVs for fire case. Last but not least thing that is missing is the latent heat of vaporization.
Unfortunately i have a multicomponent systems: acid gas condensates (H20, H2S at 9wt% max, NH3 at 12 wt% max), lean MDEA with 30wt% water, rich MDEA at max 0.6 mol% namely.
1/ Generally what is the most rigorous methodology to determinate the latent heat of vaporization for multicomponent systems?
2/ How can i simplify this specific problem?
Im currently sizins RVs for fire case. Last but not least thing that is missing is the latent heat of vaporization.
Unfortunately i have a multicomponent systems: acid gas condensates (H20, H2S at 9wt% max, NH3 at 12 wt% max), lean MDEA with 30wt% water, rich MDEA at max 0.6 mol% namely.
1/ Generally what is the most rigorous methodology to determinate the latent heat of vaporization for multicomponent systems?
2/ How can i simplify this specific problem?
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RE: Fire case - Latent heat for multicomponent system
"We don't believe things because they are true, things are true because we believe them."
"Small people talk about others, average people talk about things, smart people talk about ideas and legends never talk."
RE: Fire case - Latent heat for multicomponent system
RE: Fire case - Latent heat for multicomponent system
"We don't believe things because they are true, things are true because we believe them."
"Small people talk about others, average people talk about things, smart people talk about ideas and legends never talk."
RE: Fire case - Latent heat for multicomponent system
1. Choose the component with the lowest Hvap.
2. Run a flash calculation. Flash a small amount (1%) and determine the Hvap of that fraction.
3. Someone a while back suggested calculating the RV area for each component independently, and use the most conservative area.
4. At close to the critical point (i.e. Hvap approaches zero, use 50 Btu/lb.
Good luck.
RE: Fire case - Latent heat for multicomponent system
The more you learn, the less you are certain of.
RE: Fire case - Latent heat for multicomponent system
One of the difficult issue here is using a correct thermodynamic model to predict correctly the mixtures properties.
If you have found a "good" thermodynamic model then you adopt the princinple suggested in "Determine Latent Heat for Multi-Component and Relieving Area Using Rigorous Method in HYSYS" to size the PSV.
Point to highlight "the maximum relieving area for PSV may not occur at the beginning of flashing although majority fluid are".
JoeWong
Chemical & Process Technology
RE: Fire case - Latent heat for multicomponent system
The more you learn, the less you are certain of.