The impact of circulating hydrogen purity on the circulation rate of the circulator
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In a hydrogenation unit, why does the hydrogen purity decrease and the amount of circulating hydrogen increase when the speed of the circulating hydrogen compressor remains unchanged?； And the situation where hydrogen purity is high and the amount of recycled hydrogen is reduced.
The poster is referring to centrifugal compressors, right? The density of the medium in a centrifugal compressor is related to its discharge volume; as the purity of hydrogen increases, the relative density of the medium decreases, and consequently the discharge volume also decreases. In severe cases, the compressor may experience surge, which is detrimental to its stable operation. To address this issue, it is common to increase the temperature at the compressor inlet, thereby raising the density of the medium entering the compressor.
The density of hydrogen with low purity decreases accordingly, so the emission volume increases
This post was last edited by Amin Z6211 on 2012-10-9 at 21:54. For reciprocating compressors, the higher the purity of the circulating hydrogen, the better. As the purity of the circulating hydrogen decreases, vibration in the inlet and outlet pipelines of the unit increases, and in severe cases, this can damage the equipment and pipelines. For centrifugal compressors, I agree with the view expressed on the second floor: if the purity of the circulating hydrogen is too high, the discharge volume will decrease accordingly; in severe cases, the compressor may experience surge. This can be avoided by reducing the amount of hydrogen supplied, increasing the rotational speed, and opening the anti-surge control valve.