[Cracking Question Bank] There are mainly two ways by which coking occurs in the radiant section tubes of cracking furnaces
Thread Content
Fill-in-the-blank: There are mainly two ways by which coking occurs in the radiant section tubes of a cracking furnace, namely ( ) and ( ). They are the dehydrogenation of small molecular unsaturated hydrocarbons (formation of carbon) and the condensation of aromatics (coking). Correct answer: +5; Explanation: +10
Dehydrogenation of small molecular unsaturated hydrocarbons (carbon formation), aromatics condensation (coking)
The answer is completely correct. If it weren’t for the fact that my answer contained a ‘and’, while yours used a comma, I would have thought you could see the answer
Dehydrogenation of small molecular unsaturated hydrocarbons (carbon formation) Aromatic condensation (coking)
Dehydrogenation of small molecular unsaturated hydrocarbons (carbon formation), aromatics condensation (coking) – Influencing factors: raw material properties, pyrolysis temperature, residence time, hydrocarbon partial pressure.
Aromatic pathway and acetylene pathway. (1) The dehydrogenation to carbon reaction formed by high-temperature secondary reactions of the feed hydrocarbon during the cracking reaction ； (2) The high-temperature pyrolysis gas enters the quench boiler, where the high-boiling-point components condense on the cold tube walls; upon prolonged contact with the high-temperature pyrolysis gas, reactions such as dehydrogenation and condensation occur, resulting in coke deposits with an extremely low hydrogen content.
Dehydrogenation of small molecular unsaturated hydrocarbons (carbon formation) Aromatic condensation (coking)
Coking due to metal catalysis and coking during the polymerization of unsaturated olefins.
This post was last edited by TenPlusOneIsGreaterThanEleven on 2018-6-7 at 08:02. Are you referring to a cracking/wax production (coking) unit? Our company’s unit has also experienced coking issues before. Since I’m not in that position, I can only share what I’ve encountered: 1) it’s caused by poor water injection; 2) it’s due to a malfunction in the feed pump, resulting in a low feed rate and slow flow, which leads to the furnace burning out. I’m not sure about the other causes. I hope we’re talking about the same unit; please forgive me if I’m wrong