Patent ID: 8016589
Filing Date: 2011-09-13
Classification: B01J,C07C,F23C,Y02E

Abstract:
1. A method of starting up a direct heating system comprising a fuel introduction zone, a combustion zone and a process zone that is in heat exchange relationship with said combustion zone, said method comprises: passing a hot oxidant fluid through said combustion zone for a warm-up time period sufficient to raise the temperature of said direct heating system to a first desired temperature; continuing to pass the hot oxidant fluid through the combustion zone: passing steam through said process zone for a second time period sufficient to adjust the temperature of said direct heating system to a second desired temperature; after said first desired temperature and said second desired temperature are reached, passing a fuel fluid comprising a fuel through said fuel introduction zone; and contacting the fuel fluid with the hot oxidant fluid; wherein the step of continuing to pass the hot oxidant fluid through the combustion zone comprises continuously passing the hot oxidant fluid from the step of passing a hot oxidant fluid through said combustion zone for a warm-up time period until the step of passing a fuel fluid comprising a fuel through said fuel introduction zone.