172-65207MA-08 (SR-3/SR-8) 8 Oct 2020
System Principle
Because the SR-3/SR-8 steam condensing heat exchanger does not have any valve
parts on the Waste Steam Recovery side, it does not create any back-pressure on
upstream equipment.
For this reason, it can be directly connected to and used with feed water tanks and
other vessels that do not meet pressure vessel regulations in most locations. Consult
TLV for details.
Concerning the construction of the unit, there is a condensate outlet in the base of
the heat exchanger. This allows a water seal to be maintained which directly
prevents steam leakage. Thus, with a similar construction to closed type heat
exchangers, it can ensure an equivalent level of high efficiency heat exchange.
Operation flow of Steam Condensing Heat Exchanger SR-3/SR-8 (hereafter, SR)
①Waste steam flows into the SR from
equipment connected to the steam inlet.
②Waste steam which has flowed into the
SR (shell side) transfers heat to cold
water inside the heat transfer coil.
③Upon transferring heat the waste
steam condenses and drips down to
collect in the base of the SR.
Furthermore, since condensing steam
inside an airtight space produces a fall
in pressure, the inside of the SR is
maintained at atmospheric pressure or
a very slight vacuum (-0.5 kPaG
(-7 psi)) which ensures a smooth influx
of waste steam.
④Condensate accumulated in the base
of the tank seals the outlet, and it
becomes similar in structure to a
pseudo closed type heat exchanger
⑤Furthermore, after waste steam
transfers heat away and becomes
condensate, it overflows and is
discharged to the outside
⑥If the cold water flow rate decreases, or else the ability of the cold water to
absorb heat is surpassed causing an influx of waste steam; even if waste steam
accumulates inside the SR and the pressure begins to rise; the instant that the
pressure rises above 0.5 kPaG (7 psi) (a water seal with 50 mm (2 in) of head
pressure) the water seal will be broken and waste steam will be discharged to
the atmosphere through the exhaust outlet.
(pressure will not accumulate inside the unit)
Exhaust
Outlet
Hot Water
Outlet
Heat Transfer Coil
(Stainless)
Cold Water
Inlet
Condensate Outlet
Waste
Steam
Inlet
