【Q&A Question 054】February 23, 2017
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This post was last edited by 955559 on 2017-7-21 22:01. [Q&A Question No. 054] 2017.02.23: What causes overheating in the reactor bed? 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.) ) The reasons for overheating of the reactor bed include: failure in the temperature control at the outlet of the recycled hydrogen heater ； Weight of crude oil ； Specific gravity ； Feed pump failure ； Gouging caused by local bed blockage ； Large fluctuations in the amount of cold hydrogen and the shutdown of the circulating hydrogen compressor, etc. Petrochemical Area—“Creative Ideas for Energy Saving” event: http://bbs.hcbbs.com/thread-1666758-1-1.html The New Normal Cup—voting for the top 10 members of HaiChuan in 2016 is now underway; vote for the member you care about the most (please cast your valuable vote for the members in the Petrochemical Area). http://bbs.hcbbs.com/thread-1667649-1-1.html Summary post of Q&A questions for 2017 (updates available now). http://bbs.hcbbs.com/thread-1657793-1-1.html Summary post of daily questions for 2017 (updates available now). http://bbs.hcbbs.com/thread-1657794-1-1.html Summary post of Q&A questions from 2016 (updates completed). http://bbs.hcbbs.com/thread-1597792-1-1.html Third round of selection for outstanding management members of HaiChuan. http://bbs.hcbbs.com/thread-1655902-1-1.html Petrochemical Area—“Creative Ideas for Energy Saving” event: 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 are waiting for you (Source: HaiChuan Chemical Forum)
1. The amount of cold hydrogen is too low； 2: Excessively high furnace exit temperature ； 3: Poor properties of the oil ； 4. Excessive temperature rise during adjustment ； 5. During production adjustments, the principle of increasing volume first before raising temperature, and reducing volume first before lowering temperature was not followed
1. The feed pump has failed； 2. Failure of temperature control at the outlet of the cyclic hydrogen heater ； 3. Channeling caused by local blockage in the bed layer ； 4. Shutdown of the hydrogen circulation pump, etc.
The reasons for overheating of the reactor bed include: failure in the temperature control at the outlet of the recycle hydrogen heater； Weight of crude oil ； Specific gravity ； Feed pump failure ； Gouging caused by local bed blockage ； Large fluctuations in the amount of cold hydrogen and the shutdown of the circulating hydrogen compressor, etc.
1. Low hydrogen circulation rate. 2. Low water flow in the tube bank. 3. Low feed rate of raw materials. 4. Failure in the regulation of pressure in the high-pressure drum.
During startup, the rapid rise in temperature occurs due to poor catalyst sulfidation and passivation after feed is introduced. During normal operation, the temperature increases as a result of inadequate control over the raw materials or in the event of accidents
During startup, the rapid rise in temperature occurs due to poor catalyst sulfidation and passivation after feed is introduced. During normal operation, the temperature increases as a result of inadequate control over the raw materials or in the event of accidents
1. Collapse of the catalyst bed 2. Formation of a layer on top of the catalyst bed 3. Severe scaling on the upper distribution plate 4. Serious damage to the bed support structure
1. Collapse of the catalyst bed 2. Formation of a layer on top of the catalyst bed 3. Severe scaling on the upper distribution plate 4. Serious damage to the bed support structure
Failure in temperature control at the outlet of the cyclic hydrogen heater; heavy crude oil； Specific gravity ； Feed pump failure ； Gouging caused by local bed blockage ； Large fluctuations in the amount of cold hydrogen and the shutdown of the circulating hydrogen compressor, etc.
High inlet temperature, high reaction depth, low space velocity, changes in the properties of the feed oil, failure to introduce cooling hydrogen in a timely manner, low amount of recycled hydrogen, instrument failures, and lack of proper monitoring of the instruments!