Importance

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Abstract

A heater for heating turbine exhaust gas (TEG) flowing in a downstream direction through a duct formed by sets of opposing side walls is described. A flame shield has first and second plates which extend symmetrically with respect to a horizontal center line substantially across the duct, diverge in the downstream direction, and terminate in plate edges which are spaced from proximate duct side walls. Each plate defines spaced-apart, first and second slits which communicate an upstream side of the plate with a downstream side thereof. The slits are spaced from the center line and from the plate edges. A heating gas supply pipe extends parallel to the center line across the duct and has a plurality of spaced-apart orifices that face in a downstream direction and are in flow communication with the downstream side of the plate. All orifices are arranged to discharge heating gas jets parallel to the downstream direction, and a baffle extends from respective proximate duct walls towards the center line and terminates in baffle edges which are parallel to, spaced from and in substantial alignment with the plate edges. Heating gas injected into a space of the duct downstream of the flame shield ignites and forms first and second recirculation zones which are spaced from each other in the downstream direction to thereby prolong a residence time of heating gas in the combustion zone sufficiently to substantially completely convert all CO into CO.sub.2 before the CO.sub.2 leaves the combustion zone.

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First Claim