STEAM CONDENSER WITH TWO-PASS TUBE NEST LAYOUT

摘要

A compact two-pass steam condenser having at least one improved tube nest configuration, comprising, a steam inlet (19) through which steam is received; at least one tube nest (3,10) in two distinct bundles (3,10), the top and the bottom bundle (3,10) each comprising a plurality of cooling tube (1 ) for condensing the steam received through the steam inlet (19); and at least one non- condensable gas extracting tube (18) through wich non-condensable gas contained in the steam is extracted; a condensate outlet (16) through which condensate condensed by the cooling tubes (1 ) is discharged; and a vessel (17) surrounding the tube nest (3,10), characterized in that: * the cooling tubes (1 ), arranged in two distinct bundles (3,10), are separated by a pass-partition )9) to form converging flow passages for the steam; the top bundle (3) having vertical flow passages and the bottom bundle (10) horizontal flow passages. * the top bundle (3) receives steam directly from the inlet (19 and the bottom bundle (10), in case of a double section receives steam from the inlet (19) through a central zone (6), and through a passage between the vessel (17) and the at least one tube nest (3,10) in case of single section type of condenser. * 5 to 10 % of the cooling tubes (1 ) are arranged in a distinct zone (11 ) in the bottom bundle (10) to form air cooling zone for cooling the non-condensable gases froma main cooling unit.