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Materials from Interviews with Dry Cooling System Operators Turbine exhaust or bypass steam is supplied to the condensing elements through dual 96"0 exhaust steam duct and three(3) 75"0 distribution manifolds. Each 96"0 steam duct and the 96"0 riser distribution manifold includes a drain pot to remove any condensate developed in the ducting during start-up and normal operation. The finned tube elements are arranged in a triple-roof configuration. Each roof consists of four(4) ACC modules. Each module contains one(l) fan and ten(10) finned-tube bundles. The complete ACC unit consists of 120 (12 x 10) finned- tube bundles. Each finned-tube bundle consists of200, single pass, CS-HDG oval finned tubes. The tubes are arranged in three parallel rows between tube sheets/headers. The finned-tube bundles are arranged in two roofs and assembled on a 341-6" high steel support structure. The ACC is located on the roof of the turbine building. The turbine exhaust steam duct exits the turbine from dual side exhausts, is routed to the ACC riser manifold and divides into three(3) duct risers outside of the turbine building. The steam distribution manifolds at the apex of the tube bundles directs the steam to finned-tube bundles in the nine(9) condenser modules. The nine(9) condenser modules function as parallel flow condensers. The steam and condensate flow downward, in the same direction. The remaining steam flows from the bottom of the condenser modules to the three(3) reflux modules where it is condensed in a counter-flow mode. Counter- flow, or Reflux, condensation consists of upward flowing steam and downward flowing condensate. The counter-flow mechanism permits the warm steam to be in contact with the condensate, thus minimizing sub-cooling and the risk of freezing. Figure 1 on the following page illustrates the arrangement of the parallel flow and counter flow modules. Condensate from the ACC is collected in the 18"0 condensate collection headers and is gravity drained to the ACC condensate hotwell tank. Non-condensibles are removed from the ACC at the top of the reflux modules and are evacuated by the Steam Jet Air Ejector System (SJAE). The evacuation system consists of one single-stage hogging (start-up) ejector and 2 x 100% two- stage steam holding ( operating) ejectors. Motive steam is utilized to operate the SJAE system. Cooling air is delivered through the finned tube bundles by ultra-low noise, forced draft axial fans located at the base of the ACC bundle delta. The fans are driven by two-speed electric motors and parallel shaft gearboxes. C-5PDF Image | Comparison of Alternate Cooling Technologies for California Power Plants Economic, Environmental and Other Tradeoffs
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