Recognizing the economic importance of blow heat recovery, A. H. Lundberg, Inc., has
been custom designing direct contact condensers for many years. As an integral part of
heat recovery, four different condensers have been developed.
Each direct contact unit is capable of condensing vapors flashed during the blow of either
batch or continuous digesters. All apply the cascading water principle to insure adequate
transfer units. The most efficient design raises the temperature of the cooling water as
high as possible while condensing all the condensibles.
The A. H. Lundberg, Inc. Co-Current Direct Contact Condenser is the basic unit for use
as a primary condenser for installation on a hot water accumulator tank. The blow steam
and water flows are co-current. The condensibles, noncondensibles and condensing
water all exit from the bottom of the condenser.
The A. H. Lundberg, Inc. Counter-Current Direct Contact Condenser or Vapor Precooler
is normally used as a secondary condenser in blow heat recovery systems. Flow is
counter-current and the noncondensibles are released from the top of the condenser.
Internals permitting retention of padding steam between blows in batch digester blow heat
systems can be added.
The A. H. Lundberg, Inc. Two Stage Direct Contact Condenser has been developed for
systems in which only one unit can be accommodated. This condenser combines
features of the Standard Condenser and the Counter-Current Condenser. The second
stage furnishes final condensing of any steam vapor that passes the primary stage while
further cooling noncondensible vapors. Noncondensible vapors are then removed from
the top of the condenser.
These units are designed for the customer's needs and are sized for the individual system
capacity and requirements.
Materials of construction are dependent upon the application.
Primary Condenser (Co-Current Type)
Secondary Condenser (Counter-Current)
Direct Contact 2 Stage Condenser
SH-1053-A