Treatment of process accidents
Thread Content
For hydrogenation units, if an external inspection reveals heavy black smoke coming from the chimney, how should it be dealt with?
If black smoke is observed coming from the chimney, insufficient combustion in the heating furnace is considered. It is assumed that, first, there is an insufficient oxygen level in the furnace (due to a faulty blower or overly small opening of the primary and secondary air valves), which leads to incomplete combustion; second, a fault in the fuel gas control valve results in too much fuel gas entering the furnace； In addition, it is also possible for the gas system to contain a large amount of oil; if there is a lot of black smoke, we would naturally think that the furnace tubes might have burned through.
This is a discussion to see if anyone has other insights, as well as the subsequent handling process
First, inform the operator on-site to identify the cause of the problem through the system and adjust the process parameters.
Communicate promptly with the operators on-site to determine the cause; if the furnace tube is perforated, cut off the fuel and feed, and introduce fire-fighting steam into the furnace chamber.
Negative pressure fluctuations, decreased oxygen level; observe the fire through the viewing hole
From a safety perspective, do not approach the furnace when it is not possible to determine exactly what the problem is, as a flash explosion could occur； Moreover, at this time the furnace is in an unstable state, including terms such as negative pressure and oxygen content. As for how to determine whether the furnace tube has burned through, over time the furnace temperature rises rapidly while the reactor pressure drops; one can use the process of elimination
First, check whether the oxygen level in the furnace is sufficient. Second, check whether the fuel gas contains liquid. If neither of the above issues exists, it is possible that a cracked furnace tube is causing the furnace to emit black smoke.