Air Pollution Control

Homework $5($Electrostatic Precipitators $-$ Chapter $5)$

Problem $1(50$pts$)$

You are designing a $99\%$ efficient ESP treating $7,500\frac{m^3}{m}in$ of gas. The particles have an effective

drift velocity of $10c\frac{m}{s}.$ Plates are available of $2m$ length and $2-12m$ in height. If the gas velocity

is the maximum allowable, the duct width minimum and the aspect ratio is $1$ :

a$)$ Which plate height is optimum? $(5$pts$)$ Explain briefly why your selected height is the optimum

one. $(5$pts$)$

b$)$ Calculate the corona power. $(20$pts$)$

Always check if your calculations are within the allowable range $($check point$).(4$pts$)$

Unit conversions: $2$ pts

Actual collection area: $5$ pts

All other variables and calculations: $8$ pts

Clear structure of the excel file: $1pt$

Problem $2(50$ pts$)$

An ESP must treat $500,000$ acfm with $98\mathrm{.}4\%$ efficiency. Assuming an effective drift velocity of

$0\mathrm{.}4f\frac{t}{sec},$ each plate is $20ft$ tall by $10ft$ long, and there are $4$ mechanical fields:

a$)$ Calculate the required collection area in $f{t}^2.(10$pts$)$

b$)$ Calculate the actual collection area in $f{t}^2.(10$pts$)$

c$)$ Calculate the total number of plates. $(10$pts$)$

d$)$ Calculate the corona power required for this configuration of the ESP. $(10$pts$)$

Always check if your calculations are within the allowable range $($check point$).(5$pts$)$

All other variables and calculations, and clear excel file: $5$ pts

Important note: this problem requires some calculations to be done differently from the excel

spreadsheets given. Make sure you understand how the estimations are done at each step. please provide formulas to input into excel sheet