| 摘要 |
<p>A heat recovery apparatus for boilers, or the like, comprising a heat recovery housing with combustion gas inlet (26) in the bottom, and a combustion gas outlet (22) in the top. A plurality of interconnected water conduit tubes (38) pass circuitously through the housing. A tube roof (46) is arranged above the tubes (38). A plurality of pivotal bypass dampers (28) when in a closed position define a generally flat by-pass structure angled to the horizontal and extending between a side wall to the tube roof in order to divert the flow of combustion gases from the inlet towards the water conduit tubes. A condensate drain (34) is positioned in the bottom of the housing and underneath the tubes. A plurality of pivotal exit dampers (50) when in a closed position define a generally horizontal flat exit structure extending from the opposite side wall to the tube roof and can open to allow the flow of combustion gases from the tubes to the outlet. The dampers are operated to allow alternatingly heat exchange at the water tubes and draining of condensate.</p> |
