I have to determine a suitable setting for a proportional valve to add chemical to a tank and for a suitable time to mee
Posted: Sat May 21, 2022 3:57 pm
I have to determine a suitable setting for a proportional valve
to add chemical to a tank and for a suitable time to meet the
required concentration level.
It is assumed the concentration level remains constant even when
the tank is low. During a fill operation, chemical must be added to
maintain the chemical concentration when the tank gets full.
A refill process occurs when the tank gets down to 2500L and the
tank is full capacity at 7500L. The flow rate to be able to
refill the tank can vary between 50L/min and 100L/min.
The chemical concentration set point can vary between 60 and
80ppm.
During the filling process the chemical must be added, and this
can happen at any time during the refilling process. The chemical
is added via a proportional value which can vary from 0.25L/min to
0.5L/min. The addition of the chemical does not alter the tank
level by a measurable amount.
Need to determine a suitable setting for the value for a
suitable time to allow the chemical to reach it's set point value
during the tank refilling process.
I have attempted this by finding out the mass of the chemical at
2500L and again at 7500L while the level is 60ppm. I can identify
that 300grams must be added during the refilling process, however
I'm unsure how to approach the problem from the proportional value
setting required.
Please assist.
to add chemical to a tank and for a suitable time to meet the
required concentration level.
It is assumed the concentration level remains constant even when
the tank is low. During a fill operation, chemical must be added to
maintain the chemical concentration when the tank gets full.
A refill process occurs when the tank gets down to 2500L and the
tank is full capacity at 7500L. The flow rate to be able to
refill the tank can vary between 50L/min and 100L/min.
The chemical concentration set point can vary between 60 and
80ppm.
During the filling process the chemical must be added, and this
can happen at any time during the refilling process. The chemical
is added via a proportional value which can vary from 0.25L/min to
0.5L/min. The addition of the chemical does not alter the tank
level by a measurable amount.
Need to determine a suitable setting for the value for a
suitable time to allow the chemical to reach it's set point value
during the tank refilling process.
I have attempted this by finding out the mass of the chemical at
2500L and again at 7500L while the level is 60ppm. I can identify
that 300grams must be added during the refilling process, however
I'm unsure how to approach the problem from the proportional value
setting required.
Please assist.