INTERNALLY STIFFENED EXTENDED SERVICE HEAT RECOVERY STEAM GENERATOR APPARATUS

摘要

A heat recovery steam generator (''HRSG') includes a first casing having an interiot enclosing at least one duct for gas to flow therein along a gas flow axis. Each duct is defined by duct defining members that are spaced apart from each other and extend ink the interior of the first casing. A plurality of stiffening members are elongated along the gas flow axis. Each of the . stiffening members are positioned between two of the duct defining members. The stiffening members and.duct defining members have a substantially similar coefficient of thermal expansion.