【Q&A Question 030】2017.01.30
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This post was last edited by 955559 on 2017-7-21 at 12:36. [Q&A Question No. 030] What are the hazards of the feed temperature to the high-pressure separator being above 45 degrees on 2017.01.30? The reference answers will be visible after responding; points are awarded by identifying the key points. (Unless otherwise specified, all questions and answers are based on hydrogenation units.) 1. The solubility of hydrogen in oil products increases with rising temperature within a certain range; therefore, when the feed temperature to the high-pressure separator is above 45 degrees Celsius, more hydrogen dissolves in the oil, resulting in increased losses due to hydrogen dissolution. 2. The light components in the oil also volatilize into the circulating hydrogen due to high temperatures; upon cooling, this can result in liquid carrying over into the circulating hydrogen, causing foam to form in the desulfurization tower and threatening the stable operation of the circulating hydrogen compressor. New Normal Cup – Voting for the Top 10 Members of HaiChuan in 2016 is now underway; choose the member you care about the most (please cast your valuable vote for those from the Petrochemical Division). http://bbs.hcbbs.com/thread-1667649-1-1.html Summary post of Q&A sessions from 2017 (updates available now). http://bbs.hcbbs.com/thread-1657793-1-1.html Summary post of daily questions from 2017 (updates available now). http://bbs.hcbbs.com/thread-1657794-1-1.html Summary post of Q&A sessions from 2016 (all updates completed). http://bbs.hcbbs.com/thread-1597792-1-1.html Third round of selection for outstanding management members at HaiChuan. http://bbs.hcbbs.com/thread-1655902-1-1.html “Creative Ideas for Energy Saving” campaign in the Petrochemical Division. http://bbs.hcbbs.com/thread-1666758-1-1.html Xiaomi phones are up for grabs. Summary post collecting chemical industry technical materials from the “Petrochemical Section”. http://bbs.hcbbs.com/thread-1654603-1-1.html Many prizes await you (Source: HaiChuan Chemical Forum)
Since the solubility of hydrogen in oil increases with rising temperature within a certain range, when the feed temperature to the high-pressure separator is above 45°C, more hydrogen dissolves in the oil, resulting in increased hydrogen dissolution losses. At the same time, the light components in the oil also volatilize into the circulating hydrogen due to high temperatures; upon cooling, this can result in liquid carrying over into the circulating hydrogen, causing foam formation in the desulfurization tower and threatening the stable operation of the circulating hydrogen compressor.
Since the solubility of hydrogen in oil increases with rising temperature within a certain range, when the feed temperature of the high-pressure compressor is above 45°C, more hydrogen dissolves in the oil, resulting in increased hydrogen dissolution losses. At the same time, the light components in the oil also evaporate into the circulating hydrogen due to high temperatures; upon cooling, this can result in liquid carrying over into the circulating hydrogen, causing foam to form in the desulfurization tower and thereby compromising the steady operation of the circulating hydrogen compressor.
Circulating hydrogen contains liquid, posing a risk of cylinder collision in the circulating hydrogen compressor； Causes loss of dissolved hydrogen
High temperatures can cause liquid to be carried in the circulating hydrogen, reducing its purity and thereby affecting the hydrogen partial pressure
The function of high-pressure separation is to separate oil, water, and gas; if the inlet temperature is above 45 degrees, some of the separated light oil will enter the gas stream and be carried away along with the recycled hydrogen.
The solubility of hydrogen in oils increases within a certain range as the temperature rises; therefore, when the temperature is above 45 degrees, more hydrogen dissolves in the oils, resulting in an increased loss of dissolved hydrogen； At the same time, the light components in the oil also evaporate into the circulating hydrogen due to high temperatures; upon cooling, this can result in liquid carried in the circulating hydrogen, which in turn causes foaming in the desulfurization tower for the circulating hydrogen, threatening the stable operation of the circulating hydrogen compressor
An increase in the amount of hydrogen dissolved in the oil leads to greater hydrogen loss.
Light hydrocarbons precipitate, and the circulating hydrogen contains a large amount of liquid; if the liquid level in the liquid separation tank at the inlet of the circulating hydrogen is too high, this liquid will also enter the circulating hydrogen compressor
The high temperature of the circulating hydrogen, combined with high linear velocity, along with oil presence, poses risks to the operation of the circulator