Importance

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Abstract

In a process in which a furnace having multiple coils is utilized to heat a fluid stream, a comparison of a measured pressure of the fluid stream to a desired pressure is utilized to bias a temperature control system for the furnace which maintains the furnace outlet temperatures from the plurality of coils substantially equal so as to substantially maximize the transfer of heat to the fluid stream while maintaining a desired pressure for the fluid stream. If multiple furnaces are utilized, a bias term based on a comparison of the total flow through each furnace may be utilized to bias the temperature control system so as to maintain a desired split in the total flow between the plurality of furnaces.

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First Claim