Is it necessary to keep the permanent light in the heating furnace on during shutdown? ?
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Assuming a shutdown of about 2 weeks, is it necessary to keep the eternal light on for an extended period? For the light oil products with a density of around 0.7 that we process, will the perpetual flame suffer from coking if it remains lit for a long time? If it stops and the temperature rises rapidly during restart, could this affect the furnace lining and cause it to crack? This post was last edited by yfq4308 on 2009-2-19 17:09.]
I personally think it is necessary, as the constant-lit lamp serves to monitor the intake air conditions in order to ensure safety.
It is called an everlasting lamp precisely because it is meant to remain unextinguished, and besides, the downtime is not long.
According to what the poster described, the eternal light can definitely be turned off； But it’s another matter if lower-level managers consider that their immediate superiors might suddenly have some idea that is difficult to deal with, and thus resort to this tactic.
When the furnace is in operation, it can go out for various reasons; if fuel continues to flow into the burner, an explosion in the furnace chamber can occur. I have encountered such accidents, and they are extremely dangerous. The function of the perpetual light is to prevent the main burner from going out while the furnace is in operation, and to ignite it when fuel continues to flow in, thereby avoiding explosions in the furnace chamber. Therefore, if the furnace is shut down, the eternal flame must be extinguished; when restarting the furnace, simply follow the procedures.
An ever-burning lamp is a safety measure, and it generally needs to be kept lit!
I mean, if the continuous lighting is turned off and operations are suspended for a short period of time (2 weeks to 4 weeks), will the furnace lining get damp? And if that moisture isn’t removed, could there be problems with the furnace tubes due to dry burning?
The long-lasting lamp generates very little heat, and that temperature has little impact on the material of the furnace tubes. It is important to ensure that the cleaning process during shutdown is thorough, so that no oil remains inside and causes dry burning. However, an eternal flame is a very important safety measure to prevent the accumulation of combustible gases in the furnace. It’s better not to keep doing it unless it’s absolutely necessary. It’s fine to shut it down for a long time. If it is to be shut down, blind flanges must be installed on the fuel pipelines before and after the furnace to ensure proper isolation, along with adequate ventilation.
No, the temperature of the constant-flame lamp is too low to cause coking, whether there is no medium inside the furnace tube or if light oil is used as the medium.
The permanent light needs to be turned off, but in the case of hydrogenation unit furnace tubes, it is possible to avoid turning off the permanent light in order to prevent corrosion by polysulfuric acid. Otherwise, turn off the engine. The lining protection is too humid; steam is used to purge the furnace at startup.
It’s just a safety measure, that’s all
In the production of everlasting lamps, they must not be extinguished, for safety reasons. It can remain lit during manual shutdown, allowing for rapid resumption of production. But if it lasts for up to 2 weeks, it should still be stopped. Although it’s lit, nothing is affected (the calorific value is very low), but it’s still a waste. Moreover, when operations are halted, there are many tasks to handle; if there’s a leak and it comes into contact with an open flame, or if a lamp that’s supposed to stay lit goes out, safety accidents can occur.
Based on the information provided by the poster, the continuous lighting should be turned off. However, to avoid carrying out any technical adjustments and for the sake of convenience, some people keep it on; once it is turned off again and operations resume, the heating curve can be determined based on the specific circumstances, in order to prevent cracking of the furnace lining
Actually, with such a long period of shutdown, it’s better for the eternal flame to be extinguished. When operations resume, it’s sufficient to light it again and raise the temperature gradually as required. As I recall, an eternal flame refers to one that remains lit while the heating furnace is in operation, not one that stays lit 24/7 throughout the year. Keeping a lamp lit when the equipment is shut down is nothing but a waste, isn’t it? Of course, if operations can be resumed in a short period of time, that’s still best (within 24–48 hours). This is merely my personal opinion; please feel free to offer your criticism and suggestions. This post was last edited by Liu Jingguo on 2009-2-25 at 08:24.]
When work stops, the ever-burning lamp must be turned off. Perform steam purging when restarting, and raise the temperature as specified.
There’s no need to keep it running for a long time. If you’re worried about problems, handle the gas line by installing a blind flange. As for your opinion, it’s unnecessary worry