Patent ID: 9163829
Filing Date: 2015-10-20
Classification: F23C,F28D

Abstract:
1. A moving bed heat exchanger, comprising: a vessel including an upper portion having a hot ash feed opening, a lower portion having a floor including a discharge opening therein, and an intermediate portion disposed between said upper portion and said lower portion, said vessel being configured so as to thereby direct a gravity flow from said upper portion through said intermediate portion to said floor of said lower portion of said vessel of hot ash particles received in said vessel via said feed opening and to effect the collection of said hot ash particles on said floor of said lower portion of said vessel; a plurality of tubes disposed only in said intermediate portion of said vessel and configured so as to thereby direct a flow of working fluid in a direction substantially orthogonal to the direction of the directed gravity flow of said hot ash particles through said intermediate portion of said vessel, such that heat from said hot ash particles is transferred to said working fluid to thereby cool said hot ash particles as the gravity flow of said hot ash particles is directed to said lower portion of said vessel; a discharge pipe extending through the discharge opening into the lower portion of the vessel; a hood arranged as a low pressure ash control valve including a labyrinth chamber formed at said floor; an air inlet is configured to inject air into the hood for driving collected cooled hot ash particles through an inlet opening of the discharge pipe and said discharge opening of said vessel by creating a pressure condition in the hood that is lower relative to a pressure formed by a static head of the collected cooled ash; and the floor is configured to collect hot ash particles only in the lower portion of the vessel.