Shell and tube heat exchanger
A
shell and tube heat exchanger
is a class of heat exchanger designs. It is the most common type of
heat exchanger in oil refineries and other large chemical processes,
and is suited for higher-pressure applications. As its name implies,
this type of heat exchanger consists of a shell (a large pressure
vessel) with a bundle of tubes inside it. One fluid runs through the
tubes, and another fluid flows over the tubes (through the shell) to
transfer heat between the two fluids. The set of tubes is called a
tube bundle, and may be composed of several types of tubes: plain,
longitudinally finned, etc.
Heat
is transferred from one fluid to the other through the tube walls,
either from tube side to shell side or vice versa. The fluids can be
either liquids or gases on either the shell or the tube side. In
order to transfer heat efficiently, a large heat transfer area should
be used, leading to the use of many tubes. In this way, waste heat
can be put to use. This is an efficient way to conserve energy.
Heat
exchangers with only one phase (liquid or gas) on each side can be
called one-phase or single-phase heat exchangers. Two-phase heat
exchangers can be used to heat a liquid to boil it into a gas
(vapor), sometimes called boilers, or cool a vapor to condense it
into a liquid (called condensers), with the phase change usually
occurring on the shell side. Boilers in steam engine locomotives are
typically large, usually cylindrically-shaped shell-and-tube heat
exchangers. In large power plants with steam-driven turbines,
shell-and-tube surface condensers are used to condense the exhaust
steam exiting the turbine into condensate water which is recycled
back to be turned into steam in the steam generator.
Different types of shell and tube heat exchangers and their applications
The
simple design of a shell and tube heat exchanger makes it an ideal
cooling solution for a wide variety of applications. One of the most
common applications is the cooling of hydraulic fluid and oil in
engines, transmissions and hydraulic power packs. With the right
choice of materials they can also be used to cool or heat other
mediums, such as swimming pool water or charge air. One of the big
advantages of using a shell and tube heat exchanger is that they are
often easy to service, particularly with models where a floating tube
bundle (where the tube plates are not welded to the outer shell) is
available.
TDW
Design feature:
|
-Application:
Especially
suited for cooling of lube oil and hydraulic oil in engines,
transmission. Also used in the plastic machinery industry.
BCF/ CCF
Design feature:
-Optional:
|
-Application:
Cooling,
heating and condensing of different media either by fluids or steam.
Typically used in process engineering as well as in mechanical and
plant engineering. Decades of proven reliability in cooling of lube
oil and hydraulic oil, in the tool, plastic and compressor industry.
SSCF
Design feature:
- The standardised and pre-engineered counterpart of the BCF line, but made of stainless steel 1.4571(V4A).
-Application:
Ideally
suited for the chemical, refining, pharmaceutical, and process
industries where aggressive fluids are to be heated or cooled.
CCFA
Design feature:
- Non-removable tube bundle, 1-pass design
- Very high compressive strength
- Best price performance ratio
-Application:
Especially
suited to cool air and gas, especially very high pressures. To be
used as intercooler or after cooler.
Univex-compact series
Design feature:
|
-Application:
Cooling
of: hydraulic oils and lube oils, converter oils, cutting oils,
cooling oils, hydraulic liquids, water/glycol. Low-cost coolants that
can be used are: service water and seawater.
References
- www.wikipedia.org
No comments:
Post a Comment