| 摘要 |
<p>1. A mixing condenser for condensing steam by direct contact with a cooling liquid, said condenser comprising : - an enclosure (10), - at least one gas inlet (14) at the bottom of this enclosure for receiving a gaseous mixture (20) containing steam and an uncondensable gas, - at least one series of horizontal trays (11) disposed inside this enclosure and each presenting an elongated shape having the same length along the same horizontal direction and having their widths extending along the same transverse horizontal direction, each tray including a bottom perforeted by numerous holes (22), these trays following one another vertically from top to bottom from a first tray to a last tray with the gaps between consecutive trays being of substantially the same height over the entire height of the series, - at least one cooling liquid inlet (15) feeding said first tray so that the holes through the bottom of this tray allow a corresponding number of vertical jets to flow therethrough which together constitute a first shower which extends over the length of this tray, which is associated therewith, and which feeds the second tray, and so that the second tray similarly constitutes a second shower which is associated therewith and which feeds the third tray, and so on to a last shower, each shower (30) being associated with a tray belonging to the same rank, thereby condensing the steam by contact with the liquid in these showers, this liquid being heated by this contact and by mixing with the condensate, - at least one outlet fo heated liquid (32) at the bottom of said last shower, - and extractor means for extracting the uncondensable gases (16, 28) from the top of this enclosure, these means being placed in such a manner that the gaseous mixture arising via said steam inlet can only reach these extractor means by passing through said showers (30) along said transverse direction, - this condenser being characterized by the fact that it includes separator walls (SA, SB) dividing said series of trays with their associated showers into a plurality of portions (12, 13) which succeed one another vertically and in such a manner that said gaseous mixture (20) passes in parallel along the same transverse direction through the various showers (30) from the various trays (11) of the same portion, and that this mixture passes through successive ones of said portions in series from the bottom to the top, the number of trays in successive portions increasing form the first to the last portion in such a manner as to reduce the flow cross-section of this gaseous mixture as its flowrate decreases by virtue of the steam condensing, thereby maintaining a substantially optimal scavenging speed suitable for entraining the uncondensable gas and for promoting heat exchange, while giving the various showers substantially the same optimum height which optimizes heat exchange relative to water headloss.</p> |
