Air cooled vacuum steam condenser with flow-equalized mini-bundles.

摘要

A single-row, two-pass steam condensing bundle (12) used for condensing steam in air-cooled vacuum steam condensers in power plant applications and the like is divided into a plurality of identically built mini-bundle sets (A-F). Each mini-bundle set has one centrally located 2nd-pass tube (14) with symmetrically placed 1st-pass tubes (13) positioned on either side of it. The steam leaving each 1st-pass tube (13) is controlled by a flow equalizing device (15) installed at the end of the tubes. The flow of the noncondensible gas mixture (32) leaving each 2nd-pass tube (14) is controlled by an individual orifice (17) in the gas piping system. The larger the number of mini-bundle sets incorporated into the bundle, the greater its counterflow freeze protection feature.