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.
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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:
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\large
$$
Q_
Unknown macro: {Alum}
= {{Q_P \times C_T } \over {C_C }} $$
Where,
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\large$$Q_
Unknown macro: {Alum}
$$
= Flow Rate of Alum Solution
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\large$$Q_
Unknown macro: {P}
$$
= Plant Flow Rate
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\large$$C_
Unknown macro: {T}
$$
= Target Alum Concentration
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\large$$C_
Unknown macro: {C}
$$
= Alum Concentration in the Stock Tank
Orifice Equation:
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\large $$ Q = K_
Unknown macro: {vc}
A_
Unknown macro: {or}
\sqrt
Unknown macro: {2gh}
$$
Where,
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\large$$Q$$
= Flow Rate
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\large$$h$$
= Head Loss
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\large$$A_
Unknown macro: {or}
$$
= Area of the Orifice
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\large$$K_
Unknown macro: {vc}
$$
= Orifice Constant
Rearranging the orifice equation,
Orifice Head Loss:
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$$
h_
Unknown macro: {1Orifice}
= K_
Unknown macro: {DoseOrifice}
{Q\ over A_{or^2 } \over {2g}}
$$
Major Head Loss:
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$$
h_
Unknown macro: {Lmajor}
= f {L\over {D}}V^2} \over {2g
$$
Where,
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\large$$f$$
= friction factor (dependent on Reynold's number)
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\large$$D$$
= diameter
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\large$$V$$
= velocity (Q/A)