The influence of low high-temperature on the purity of circulating hydrogen
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What is the effect of low high-temperature on the purity of circulating hydrogen?
As the temperature rises, the amount of light components mixed in the recycled hydrogen increases, resulting in a decrease in purity； At the same time, increasing the frequency of liquid removal from the compressor inlet separator tank also increases the likelihood of waste hydrogen being released; here we control the temperature at 40–50°C.
Excessively high temperatures cause the recycled hydrogen to carry volatile components such as methane and ethane into the circulating gas stream, leading to their accumulation in the recycled hydrogen and a decrease in its purity. High temperatures can also result in liquid entrainment in the recycled hydrogen compressor; therefore, it is generally required that the temperature of the cooled hydrotreated gas be below 45°C.
When the high-temperature threshold is slightly increased, although it has little effect on the volume percentage concentration of the recycled hydrogen, the increase in the content of light hydrocarbon components such as methane and ethane leads to a significant rise in the molecular weight of the recycled hydrogen, which in turn has a noticeable impact on the compressor’s power consumption. If not taken into account, this can easily result in the compressor shutting down due to overload.
Excessively high cold high-pressure temperatures can lead to an increase in hydrocarbon components, more frequent liquid removal before the amine scrubber, a greater likelihood of oil contamination in the amine-rich liquid, reduced purity of the recycle hydrogen, and an increased volume of recycle hydrogen.
It may cause oil to enter the cyclohydrogen desulfurization tower, leading to liquid presence at the compressor inlet and posing a risk to the operation of the compressor