Chemical Dose Controller Design Program
This program will code for a general dose controller design and will incorporate the design into the Automated Design Tool. The doser design will be for a triple scale (three different orifices). See the CDC research team page for a more detailed explanation of this.
Unable to render embedded object: File (FinalDoser.jpg) not found.
Unable to render embedded object: File (DoserDraft.jpg) not found.
Design Process:
Expert Inputs:
HL.ChemDoserMin
User Inputs:
Q.Plant (HL.Plant)
Design Assumptions:
C.DoserScaleAlumMax
Code Calculations:
Constant head tank orifice size
Dosing tubes size to ensure orifice head loss is much greater than major loss in tubing
Equations:
Target Alum Concentration:
\large
$$
Q_
= {{Q_P \times C_T } \over {C_C }} $$
Where,
\large$$Q_
$$
= Flow Rate of Alum Solution
\large$$Q_
$$
= Plant Flow Rate
\large$$C_
$$
= Target Alum Concentration
\large$$C_
$$
= Alum Concentration in the Stock Tank
Orifice Equation:
\large $$ Q = K_
A_
\sqrt
$$
Where,
\large$$Q$$
= Flow Rate
\large$$h$$
= Head Loss
\large$$A_
$$
= Area of the Orifice
\large$$K_
$$
= Orifice Constant
Rearranging the orifice equation,
Orifice Head Loss:
$$
h_
= K_
{Q\ over A_{or
^2 } \over {2g}}
$$
Major Head Loss:
$$
h_
= f {L\over {D}}V^2} \over {2g
$$
Where,
\large$$f$$
= friction factor (dependent on Reynold's number)
\large$$D$$
= diameter
\large$$V$$
= velocity (Q/A)