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[rajbhar_s]

What are the steps and sequence of turndown and shutdown of an Ammonia Plant?

 

Broadly, as I believe, a planned shutdown starts with reducing load on Ammonia Refrigeration Section and then shutting the Purge Gas Recovery. Then, slowly fuel has to be cut-off (here, Methane is used with Gas Turbine), followed with Feed and Steam.

 

I would like to know about process considerations and detailed turndown steps with other Unit Ops involved. There could lots of parallel activities which can be done simultaneously - so a summary in the form of flowchart / schedule will be very helpful in understanding 

 

Any assistance in this regard will be useful.

 

Thanks,

 

Sanjay R