[Q&A Question 141] 2016.09.08
Thread Content
【Q&A Question 141】September 08, 2016: How to adjust low purity of recycled hydrogen? The answer key will be available after responding; scoring is based on answering the key points. 1. Exhaust hydrogen discharged from the top of the cold high-pressure section ； 2. Improve the purity of the hydrogen used for supplementation ； 3. Improve the desulfurization capacity of the circulating hydrogen desulfurization tower.
The purity of fresh hydrogen is the main factor affecting the purity of recycled hydrogen; for every 2% increase in the purity of fresh hydrogen, the purity of recycled hydrogen can increase by about 3.5%. The temperature of the cold high-pressure separator also has a significant impact on the purity of recycled hydrogen – for every 5°C decrease in this temperature, the purity of recycled hydrogen can increase by about 1%.
1. Reduce the reaction temperature； 2. Increase the amount of hydrogen waste emitted, while simultaneously increasing the supply of new hydrogen
Remove waste hydrogen to increase hydrogen purity!
Release an appropriate amount of recycled gas； If the high temperature of the cold fractionator results in an excessive amount of hydrocarbons in the gas composition, it is necessary to lower the temperature of the cold fractionator accordingly.
Increase the amount of lean amine solution injected, raise the waste hydrogen emission volume, improve the purity of fresh hydrogen, and optimize the raw materials
Adjustment: Exhaust hydrogen replacement； Increase the purity of the hydrogen supplement ； Improve desulfurization in the circulating hydrogen desulfurization tower.
First, emit waste hydrogen. Second, adding new hydrogen increases the hydrogen partial pressure, which in turn raises the system pressure. Third, if there is an excess of product quality, the reaction temperature can be appropriately reduced to decrease the consumption of fresh hydrogen in the recycle hydrogen stream.
Increase the amount of hydrogen waste discharged, improve the purity of the new hydrogen, and reduce the temperature of the high-pressure separation tank