INTRODUCTION
This program breaks the day into 1 minute slots and for
each minute the effect of steam out of the system and
make-up water into the
system is considered.
Water into the system contains dissolved solids and
chemicals necessary to combat the effects of dissolved oxygen
and hardness, alkalinity builder is added to keep the chemistry correct
which also adds to the dissolved solids level
and chemicals to protect for the condensate system.
Unless these chemicals are dosed in the right proportions and at the right point
in the system the boiler installation
will suffer scale and corrosion damage. Heat transfer efficiency will decrease
and the plant becomes costly to operate.
Too much scale will cause boiler failure
and too much dissolved oxygen causes pitting with eventual boiler failure.
Overdosing Oxygen Control can increases boiler water dissolved solids which
results in excess blowdown and water
and energy is wasted.
This program was originally written to evaluate
the effect of various dosing and water parameters applied to a steam boiler,
the point of the software being both training an estimation the cost
implications each variable.
The figures produced by its output can only be
considered to be relative but every attempt has been made in the software to
make the calculations as representative as possible. Certain parameters have not
been calculated and best estimations have
been used in places.
The program considers many aspects of boiler
operation, for example allowances have been made for varying the effects of
the dosing pump settings by allowing the capacity, stroke length, strokes per
minute and control methods to be configurable.
Likewise feedwater input, feed water heater sizes and steam heating rates are
also configurable.
The resulting temperature of the feedwater relates to the dissolved oxygen (in
open feed tanks) and so the quantity contribution
to dissolved solids are calculated and hence water wasted by overdosing and
excess blowdown.
Should any potential contributors to this program wish to contact the author then this should be done initially via Aquanet's agents
INITIAL LAUNCH
On initial launch of the program a screen appears with the conditions of use, at the top of the screen is a Menu item.
Persons familiar with the program and boiler
systems can press the "Accept" button and be taken to the main
boiler model screen.
If the user is new to the software they are advised to use the button "Assemble Boiler Installation and then run model"
This will take them to the the boiler model page which is initially blank with a button saying "Next"
Each time the button is pressed a section of the boiler installation is added, the next few pages describes the process
If the user is experienced with Steam boiler
operation then they may optionally press Run Model (Advanced) and they
will be presented with the model ready to configure to their own figures and run
a simulation.
Each aspect of the screen is described on the
following pages and assumes the user has opted for the
"Assemble Boiler Installation" Option
Copyright Aquanet International Ltd 2009