What are the conditions that can lead to an explosion in the reverse regeneration system of a catalytic unit, and how can these be avoided through design and operation?
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What are the causes of explosions in the reverse regeneration system of catalytic units, and how can they be avoided through design and operation?
The two mutual intrusions were one of the main reasons for the explosion; there must be robust safeguards in the design regarding parameters such as storage capacity and pressure differences between the two areas
Modern catalytic cracking units are quite advanced; they will activate as soon as the interlock conditions are triggered. It depends on the interlock logic of the unit’s design and the behavior of its equipment.
Explosions in these two devices usually occur due to excessive pressure in the settler, causing loss of control. Nowadays, automatic control systems are quite advanced, and interlocks based on the pressure difference between the two devices are used
An explosion occurs when there is a loss of control in terms of space and time; three elements are essential: combustible material, an oxidizing agent, and a source of ignition. If the reaction proceeds uncontrollably, it will result in burning and the emission of black smoke； However, if the recycled air enters the reaction zone, the high concentration of combustible gases in the reaction system can explode when it comes into contact with oxygen. In terms of design, it is necessary to install safety valves to release pressure in a timely manner; additionally, the SIS system should be configured with self-protection functions. During operation, it is essential to monitor the instruments regularly to ensure that the differential pressure between the two devices remains normal and that the material feeding via the inclined tube proceeds smoothly