The issue of liquid carried in the circulating hydrogen
Thread Content
Hydrocracking unit with a desulfurization system; the specific process is as follows: the recycled hydrogen produced by the cold high-pressure separator passes through a liquid removal tank before entering the desulfurization tower, then goes to the liquid separation tank at the inlet of the recycled hydrogen compressor, and finally enters the recycled hydrogen compressor! What causes the rise in the liquid level in the liquid separation tank at the inlet of the desulfurization tower? Reasons for analysis: 1. High temperature control in the cold high-pressure section; 2. Fluctuations in the liquid level of the cold high-pressure section; 3. Fluctuations in system pressure; 4. The properties of the feed oil becoming lighter; 5. Problems with the wire mesh demister; 6. Excessive impurities in the recycle hydrogen, resulting in reduced purity; 7. False readings of the liquid level. Are there any other reasons? I hope experts can provide some guidance!
Is the circulating hydrogen voltage line a voltage line for the desulfurization tower? The adjustment is to regulate the hydrogen sulfide content in the recycled hydrogen! What is the impact on the presence of liquid? Does it affect purity?
The analysis is very comprehensive; it is possible to lower the control temperature for cold high fractions, which will increase the liquid yield while also reducing foaming in the amine solution
What is a suitable temperature control for cold high scores? Below 45°C?
Generally, the temperature after cooling is kept around 45°C, right?
This post was last edited by luoli519 on 2017-2-21 at 22:38. I analyze it mainly from the professional perspective of efficient gas-liquid separation at the inlet of the recycle hydrogen compressor. The main reason for liquid entrainment in the recycled hydrogen is the issue with the separation tank at the inlet of the recycled hydrogen compressor. The poster mentioned that an increasing liquid level in the separator tank at the inlet of the recycle hydrogen compressor has two different effects. On one hand, an elevated liquid level in this separator tank reduces the space available for liquid droplets and foam to settle out of the gas phase, thereby shortening the distance over which these droplets can settle by gravity; this has a positive effect on the separation of such droplets ； On the other hand, as the liquid level in the separator tank at the inlet of the cyclohydrogen compressor rises, the distance between the liquid surface and the main flow channel decreases, which makes it easier for the liquid on the surface to be carried away by the fast-moving main airflow and dispersed back into it. This has a negative effect on the removal of liquid droplets from the airflow. These two contradictions interact with each other, which requires that the corresponding gas-liquid separation internals possess high operational flexibility, high separation efficiency, and high operational stability. Traditional screen-type demisters, fiber demisters, and filter element-type demisters belong to the category of barrier-type demisting separators, and they have significant technical shortcomings in terms of operational flexibility, separation efficiency, and operational stability; as a result, their performance is not ideal, with the exhaust gas from the separation tank containing a large amount of liquid. The feather-leaf high-efficiency gas-liquid demisting and mist separation device integrates kinetic energy and momentum conversion separation, centrifugal separation, coalescence separation, as well as liquid surface free energy capture separation to create a dynamic integrated separation demisting technology and associated components. It enables significant improvements in the operational flexibility, separation efficiency, and operational stability of traditional mesh demisters, fiber demisters, and filter-element-based demisters. It can address the issue of liquid contamination in circulating hydrogen right at the inlet separator of the circulating hydrogen compressor, thereby providing effective protection for the core equipment in that compressor. For more technical information on the feather-leaf type high-efficiency gas-liquid demisting separator, you can visit http://bbs.hcbbs.com/thread-1354813-1-1.html for further details.
Thank you, the explanation is very detailed! Got it!