Heat exchange unit

摘要

A heat exchange unit (214) arranged to be used to recover energy from exhaust gas, the heat exchange unit (214) comprising a gas inlet duct (222) to which a heat exchange duct (216) is connected, wherein a heat exchange array (752, 754) of a heat exchange system is situated within the heat exchange duct (216) surrounding a maintenance duct and wherein the maintenance duct (226) is arranged to allow access for inspection and/or maintenance of at least part of the heat exchange system.

主权项

1. A heat exchange unit adapted to be connectable to a gas turbine and arranged to recover energy from exhaust gas of a gas turbine to which the unit is attached, the heat exchange unit comprising:
an inlet duct which in use is in fluid connection with the gas turbine; and a heat exchange duct connected to the inlet duct,wherein the inlet duct and heat exchange duct have substantially perpendicular longitudinal axes so as in use gas is delivered to the heat exchange duct in a direction substantially perpendicular to the longitudinal axis of the heat exchange duct, wherein the inlet duct is arranged to introduce gas tangentially to the interior of the heat exchange duct, andwherein the heat exchange duct comprises:
a velocity dissipation chamber; and a heat exchange chamber arranged around a central duct which is one of a maintenance duct and a bypass duct, wherein exhaust gas is delivered via the inlet duct to a portion of the interior perimeter region of the velocity dissipation chamber where high speed circulating gas currents dissipate their kinetic energy in a controlled manner before moving through the heat exchange duct and over a helical heat exchange array situated within the heat exchange chamber of the heat exchange duct.