LN2 Electricity Power Consumption 1

[tarekzad]

I'm conducting a techno-economic feasibility study for producing LN2 - liquid nitrogen in the middle east region.


I was looking for any chemical, process, or electrical engineer who can help me by providing the rule of thumb of electricity consumption to produce N2 gas and N2 liquid at medium purity, as a Kwh/Nm3 or Kwh/Kg.


The process will be air separation using a cryogenic distillation process. and the daily production of LN2 and N2 will reach 30 Mt per day


Also, the Ln2 shall be kept refrigerated, so a rule of thumb for continuous circulation and refrigeration is needed.

 

[EdStainless]

There are cryogenic gas handbooks that cover liquefaction, seperation, purification, and storage. They give the power consumption values.
There are only a few people in the world that design these plants so you should be able to find one of them to talk to.

= = = = = = = = = = = = = = = = = = = =
P.E. Metallurgy, consulting work welcomed

 

[Caloooomi]

30 Mt / day = 1000 Nm3/hr?

Look up vendor sites for comparisons e.g.

http://www.uigi.com/uni3000.html

0.86 kWh/Nm3 there.

Cosmodyne, Linde Cryoplants are others.

 

[tarekzad]

Dear Caloooomi ,

The production output you stated is correct, however, I was searching for a more accurate electricity consumption rate, hence most of the references is always indicating the Compressor power rate for producing Nm3 of LIN or LN2

For the feasibility study, it is better to stand on the more accurate data to calculate the power/electricity consumption considering the Compressor, Expander, Cooling Towers, Pumps ....etc

since the Feasibility study is dealing with the cost, revenue, and profit, we need to see the real value of KWh need to produce that product ( LIN/LN2.

I would not say that the provided Citation ( UIGI ) is wrong, but it is not an accurate figure, however, we cant deny that compressor power is the biggest chunk of power consumption in any cryogenic process.


Thanks again for your support.

Tarek Barham
+971563188219
tarek@zadconsult.com