Patent ID: 9429075
Filing Date: 2016-08-30
CPC Classification: F02C,F05D

Claim Text:
1. A method of operating a fuel heating system, the fuel heating system including an exhaust flow circuit configured to heat a fuel flow circuit having at least one inlet damper, at least one outlet damper, and at least one recirculation damper, the method comprising: performing pre-ignition diagnostic checks on a plurality of components of the fuel heating system, wherein, during the performing of the pre-ignition diagnostic checks, the at least one inlet damper and the at least one outlet damper are each in a closed position; purging the fuel heating system of an accumulation of unburned hydrocarbons; operating the fuel heating system in a normal operating condition; and operating the fuel heating system in a cool down condition, wherein, during the operating of the fuel heating system in the cool down condition, the at least one inlet damper is in the closed position, wherein the at least one inlet damper controls an amount of exhaust air that enters the exhaust flow circuit via a supply path, the at least one outlet damper controls an amount of exhaust air that exits the exhaust flow circuit via an outlet path, and the at least one recirculation damper controls an amount of exhaust air that is recirculated in the exhaust flow circuit from the outlet path to the supply path via a recirculation path.