Steam-water separation is one of
critical process in the steam boiler system especially in steam drum. Steam is
usually installed in steam generators and high pressure boilers. The principal
purpose is to allow for separation of saturated steam out of the mixture of
steam-water and then goes to superheater for next process. The saturated steam
is released via several outlet nozzles for special utilization or even further
more heating.
In addition for place steam-water
separation, steam drum also assists for following below:
- Offer
restricted water storage to support quick adjustments in boiler load.
- Eliminate
element of water (solids content) via blowdown to manage the chemistry of
boiler water.
- Cleanse
the steam to eliminate impurities and left over moisture.
- Combine
the control of chemicals water treatment and also corrosion.
- Combine the saturated water staying right after steam-water separation with feedwater.
Even so, the principal purpose of
the steam drum is to allow the efficient performance of steam-water separation.
This particular can be obtained by supplying a huge steam-water surface area to
perform separation through natural gravity or also by way of owning adequate
area for mechanical equipment to perform steam-water separation.
Steam-water separation should be
performed efficiently because it is important in almost all steam boiler uses
so that they can:
- Avoid
the solids broken down in the steam are carried over directly into superheater in
which destroying deposits may possibly be made.
- Reduce
steam is carried under inside water which departing the steam drum in
which left over steam could decrease the performance of hydraulic head
pump.
- Avoid water droplet is carried over straight into reheater, superheater and steam turbine in which thermal destruction could happen.
Boiler water may perhaps consist
of impurities, especially in solution. Impurities occur from inside make-up
water, leakage in the condensate process and chemicals treatment. Moreover
small quantities of the solids inside steam (under 0.5 ppm) could harm
reheater, superheater and steam turbine generator.
Due to the fact the solids
solubility is commonly some requirements of specifications inside steam not as
much as inside water, little quantity of water droplet which is carried over
(in excess of 0.26% simply by weight) might effect in substantially enhanced
unwanted deposition and also the carry-over of solids into reheater,
superheater and steam turbine generator. The deposits can lead to steam turbine
deterioration in addition to increases temperature of superheater tube, so it
can be over heat.
The methods of steam-water separation process can be performed by natural Gravity Driven Separation, Baffle
Assisted Separation, and Mechanical Primary Separation. There are some factors of steam-water separation that influence efficiency of its process both design factors and operating factors.
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