[james jones]

Give me some more information. How you respond to a furnace trip depends on a lot of factors. How long is the furnace down? How long have you been in the coke drum? Did you lose flow into the coke drum? How cold did the coke drum outlet temperature get? All these things factor into the response to a furnace trip. You need to respond differently based on looking at all these factors. The main thing is to try to keep flow into the coke drum on a furnace trip. Upon a furnace trip our control system sweeps the passes with steam into the coke drum. This keeps the channels in the coke bed open. The next thing we would look at is how long has the drum been coking. If it is late in the cycle we would not reintroduce feed, but prepare the drum for decoking as normal. We would put the furnace into bypass, or swing feed into the sister drum if it is available, and then bring up the furnace. If it is in the early/middle of the coking cycle we would look at coke drum outlet temperature as a determining factor as to whether or not to reintroduce feed. A cold drum outlet temperature will create foaming issues with the reintroduction of feed. If we can get the furnace back up before the coke drum outlet temperature gets too cold then we would restart feed at a lower rate, (to extend the coking time) raise our furnace outlet temperatures and finish filling the drum.
Hope this helps,
Jimmy

[james jones]

‘he s’tuat’on you refer to ‘s a short run drum. there are several schools of thought on how to handle th’s s’tuat’on. ‘he key var’able ‘s how long you were ‘n the drum at cok’ng temperature pr’or to feed loss. We feel that ‘n s’x hours at cok’ng temperature (I go by a drum overhead temperature of 800*F as cok’ng temp.)that the drum at that po’nt can be quenched as normal. Less than 6 hours at cok’ng temp. ‘t becomes tr’cky. In all cases at the loss of feed try to get steam go’ng ‘nto the drum. If steam flow can be establ’shed then you have a couple of cho’ces. If you can put steam through your heater and you can put on some burners to super heat the steam to a temperature that w’ll cook the res’d ‘n the drum. If putt’ng the steam through the furnaces ‘s not an opt’on then extend your steam’ng of the drum for up to 24 hours, and extend your water quench.We would try to dra’n to the p’t, but ‘f o’l ‘s present we would dra’n to our coke condensate drum then rewater quench. If you can’t get steam ‘n the drum, then top water quench’ng may be your only opt’on. In any case get your techn’cal people ‘nvolved when deal’ng w’th a short run drum.

[james jones]

I apreciate the input we are gonna have auto shift cutting tools this will help.
 
Thanks

[james jones]

I appreciate the input. Its gonna be a challenge with our winch being disabbled on over tension.

[james jones]

I looked at the forum saw some good tips.
Thanks

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