ALEXANDRIA, Va., Feb. 17 -- United States Patent no. 12,553,669, issued on Feb. 17, was assigned to Lummus Technology LLC (Houston).
"External combustion air preheat" was invented by Baozhong Zhao (Houston), Xueping Li (Houston) and Alejandro Carrillo (Houston).
According to the abstract* released by the U.S. Patent & Trademark Office: "Systems and processes for external combustion air preheating for providing preheated combustion air to a furnace. The furnace systems convective heating section includes multiple heating coils for waste heat recovery. The heating coils may be used for preheating a feed (feed preheat coils), heating a boiler feed water, superheating steam, or heating or superheating a feed stream prior to the feed being fed...