摘要 |
PROBLEM TO BE SOLVED: To develop an air preheater having substantially reduced and/or effectively minimized air leakage.SOLUTION: Disclosed herein is a heat exchanger for transferring heat between a first gas flow and a second gas flow. The heat exchanger comprises: at least two sectors, namely, a first sector that is operative to receive a combustion air stream, and a second sector that is opposed to the first sector and that is operative to receive either a reducer gas stream or an oxidizer gas stream; and a pressurized layer disposed between the first sector and the second sector. The pressurized layer is at a higher pressure than the combustion air stream, the reducer gas stream and the oxidizer gas stream. |