
P a g e 5 0 • D R I - S T E E M D e s i g n G u i d e
D R I - S T E E M D e s i g n G u i d e • P a g e 5 1
Figure 50-1:
Steam injection principle of operation
Steam injection principle of operation
1. Boiler steam with entrained water enters the humidifier and
flows through a chamber surrounding the inner dispersion tube,
jacketing it with steam to eliminate condensation and dripping.
2. The steam with entrained water slows from entering the larger
space of the separator and from hitting the perimeter deflector
plate, and then begins to spin and separate.
3. The separated steam rises through the slots of the multi-baffle
plate to the upper region of the separator and enters the internal
drying tube that excludes any remaining moisture particles,
allowing only dry steam to leave the separator.
4. Separated condensate drains from the separator to the
steam trap.
5. The steam valve controls the amount of steam allowed into the
preheated dispersion tube. The steam valve is typically controlled
in one of three ways:
• By a humidistat connected to the steam valve
• By another signal, such as a building management system
• By one of DRI-STEEM’s controllers, such as VAPOR-LOGIC3.
6. Steam is discharged uniformly through the tubelets into the
airstream. Any condensate formed while passing through the
steam valve is re-evaporated in the inner tube because of heat
supplied by the outer steam jacket.
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