Discussion on PSA exhaust gas treatment
Thread Content
Dear friends: Why is it that the exhaust gas from PSA nitrogen production is discharged directly, and it is rarely used for oxygen production? Similarly, the exhaust gas from oxygen production is also discharged directly, and it is seldom used for nitrogen production.
It might be due to the complexity of the manufacturing process, or the economics don’t allow it~~
It mainly depends on the value of the concentrations of various components in your exhaust gases. If the concentration of useful components is low, the purification process becomes more complex, which increases production costs; moreover, if the utility of those components is low, it is usually better to discharge them directly in order to reduce production costs
Perhaps the cost of recycling is too high
Some only require nitrogen or oxygen, so there’s no need for recycling. Besides, if I don’t use it myself, what’s the point of recycling it? I can’t sell it anyway.
I work in this industry. It turns out that many people used to think the same way as you did, but in practice, the costs associated with recycling are higher than those of simply installing a nitrogen or oxygen generation device. Let’s take an example. It is well known that solar-powered lights are energy-efficient and inexpensive, but in reality the cost of a solar light is much higher than that of an ordinary electric light – by many times over.
The reason is quite simple; firstly, it’s definitely a matter of demand. Apart from specialized gas production, there is little need to produce nitrogen and oxygen simultaneously, and once produced they need to be stored. Secondly, the cost of recycling the equipment is higher than purchasing two separate units. At present, there is no product that can stably and repeatedly remove other impurities from oxygen/nitrogen; when using PSA, it is no different from the previous two methods, and the efficiency is even lower (as it is affected by the amount of air entering at the front end, it will definitely be lower than when air is introduced separately). At the same time, an additional set of control and storage systems is also required.