Positive-flow expansion single-tower nitrogen production process
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What is the positive-flow expansion single-tower nitrogen production process?
It’s pure nitrogen air separation – it only produces gaseous nitrogen and liquid nitrogen. The expansion refrigeration process involves forward-flow air expansion for cooling; it is widely used in the glass, electronics, and photovoltaic industries~~
Positive-flow single-tower nitrogen production refers to a process in which the cooling capacity is provided by air expanded in a positive flow direction, and this expanded air is fed into the lower part of the distillation tower to assist in the distillation process; the recovery rate is around 60%, but the outlet pressure is below 0.35 MPa.
Thank you all for your guidance! Since positive flow expansion is mentioned, is there then reverse flow expansion for reduction? Is there a big difference if so?
It should be called reverse flow expansion; oxygen-enriched vapor evaporating at the top of the main cooler is used to drive the expander for expansion cooling, and after exchanging heat with the air entering the tower, it enters the molecular sieve as a heating gas. There are four or five types of single-tower nitrogen production processes
What is referred to on the 5th floor could be called polluted nitrogen; it just has a relatively high oxygen content, around 33%. In other words, the expander pressurizes and expands the contaminated nitrogen, releasing the cold energy through a plate heat exchanger; this process is similar to that used in LNG