| 摘要 |
Products of combustion from a furnace (10) are cooled in three stages. The first stage takes place in a heat storage bed (21) which subsequently imparts heat to combustion air. The second stage takes place in a duct (26) by the injection of relatively cool air or water at (27) and the third stage takes place in a further heat store (20) which subsequently imparts heat to the combustion air. The duct (26) is readily removed for cleaning, to remove contaminants condensed therein. <IMAGE> |
