초록 ▼

Apparatus for recirculating combustion exhaust gases to the burner region of a Stirling cycle hot-gas engine to lower combustion temperature and reduct NOx formation includes a first wall separating the exhaust gas stream from the inlet air stream, a second wall separating the exhaust gas stream fro

Apparatus for recirculating combustion exhaust gases to the burner region of a Stirling cycle hot-gas engine to lower combustion temperature and reduct NOx formation includes a first wall separating the exhaust gas stream from the inlet air stream, a second wall separating the exhaust gas stream from the burner region, and low flow resistance ejectors formed in the first and second walls for admitting the inlet air to the burner region and for entraining and mixing with the inlet air portion of the exhaust gas stream. In a preferred embodiment the ejectors are arranged around the periphery of a cylindrical burner region and oriented to admit the air/exhaust gas mixture tangentially to promote mixing. In another preferred embodiment a single annular ejector surrounds and feeds the air/exhaust gas mixture to a cylindrical burner region. The annular ejector includes an annular plate with radially-directed flow passages to provide an even distribution of the air/exhaust gas mixture to the burner region.

대표청구항 ▼

Apparatus for recirculating a portion of the exhaust gases from an exhaust gas stream resulting from the combustion of an inlet fuel stream and an inlet air stream in a burner region, the apparatus comprising: (a) wall means for separating the inlet air stream from the burner region and the exhaust

Apparatus for recirculating a portion of the exhaust gases from an exhaust gas stream resulting from the combustion of an inlet fuel stream and an inlet air stream in a burner region, the apparatus comprising: (a) wall means for separating the inlet air stream from the burner region and the exhaust gas stream; (b) heat exchanger means associated with said wall means for extracting heat values from the exhaust gas stream to cool all the exhaust gases, said heat exchanger means also enclosing in part the burner region; and (c) ejector means formed in said wall means for admitting the inlet air stream into the burner region and for entraining and mixing a portion of the cooled exhaust gases from the cooled exhaust gas stream in the air being admitted, and air/cooled exhaust gas mixture being formed immediately prior to being admitted to the burner region, the recirculated exhaust gases providing lower combustion temperatures and reduced NOx formation in the burner region.