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2. [Thermal oxidiser] A thermal oxidizer removes 99.99% of the VOC (formaldehyde, CH2O) contained in an incoming waste gas stream (contaminated air). The temperature and pressure of the inlet waste gas is 15 °C and 1atm, respectively. a) Knowing that concentration of formaldehyde in the air stream leaving the oxidiser is 1 µg/m³, calculate the formaldehyde concentration (in ppmv) in the inlet air stream. For simplicity, assume that the incoming air stream behaves ideally. [Ans: 7.873 ppm.] b) Knowing that the this efficiency can be achieved within 20 seconds of reaction time, evaluate the range of heights of the thermal oxidiser tower if the surface velocity of the air stream flowing through it varies between 1 to 20 m/s. [Ans: 20 - 400 m] c) If the height of the oxidiser tower to be built is 100 m and the exhaust flow rate is 150 m³/s, what will be the diameter of the tower? [Ans: = 6.18 m]

2. [Thermal oxidiser] A thermal oxidizer removes 99.99% of the VOC (formaldehyde, CH2O) contained in an incoming waste gas stream (contaminated air). The temperature and pressure of the inlet waste gas is 15 °C and 1atm, respectively. a) Knowing that concentration of formaldehyde in the air stream leaving the oxidiser is 1 µg/m³, calculate the formaldehyde concentration (in ppmv) in the inlet air stream. For simplicity, assume that the incoming air stream behaves ideally. [Ans: 7.873 ppm.] b) Knowing that the this efficiency can be achieved within 20 seconds of reaction time, evaluate the range of heights of the thermal oxidiser tower if the surface velocity of the air stream flowing through it varies between 1 to 20 m/s. [Ans: 20 - 400 m] c) If the height of the oxidiser tower to be built is 100 m and the exhaust flow rate is 150 m³/s, what will be the diameter of the tower? [Ans: = 6.18 m]

Introduction to Chemical Engineering Thermodynamics
Introduction to Chemical Engineering Thermodynamics
8th Edition
ISBN:9781259696527
Author:J.M. Smith Termodinamica en ingenieria quimica, Hendrick C Van Ness, Michael Abbott, Mark Swihart
Publisher:J.M. Smith Termodinamica en ingenieria quimica, Hendrick C Van Ness, Michael Abbott, Mark Swihart
Chapter1: Introduction
Section: Chapter Questions
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2. [Thermal oxidiser] A thermal oxidizer removes 99.99% of the VOC (formaldehyde, CH₂O) contained in an incoming waste gas stream (contaminated air). The temperature and pressure of the inlet waste gas is 15 °C and 1atm, respectively. a) Knowing that concentration of formaldehyde in the air stream leaving the oxidiser is 1 µg/m³, calculate the formaldehyde concentration (in ppmv) in the inlet air stream. For simplicity, assume that the incoming air stream behaves ideally. [Ans: 7.873 ppm.] b) Knowing that the this efficiency can be achieved within 20 seconds of reaction time, evaluate the range of heights of the thermal oxidiser tower if the surface velocity of the air stream flowing through it varies between 1 to 20 m/s. [Ans: 20-400 m] c) If the height of the oxidiser tower to be built is 100 m and the exhaust flow rate is 150 m³/s, what will be the diameter of the tower? [Ans: 6.18 m]
Transcribed Image Text:2. [Thermal oxidiser] A thermal oxidizer removes 99.99% of the VOC (formaldehyde, CH₂O) contained in an incoming waste gas stream (contaminated air). The temperature and pressure of the inlet waste gas is 15 °C and 1atm, respectively. a) Knowing that concentration of formaldehyde in the air stream leaving the oxidiser is 1 µg/m³, calculate the formaldehyde concentration (in ppmv) in the inlet air stream. For simplicity, assume that the incoming air stream behaves ideally. [Ans: 7.873 ppm.] b) Knowing that the this efficiency can be achieved within 20 seconds of reaction time, evaluate the range of heights of the thermal oxidiser tower if the surface velocity of the air stream flowing through it varies between 1 to 20 m/s. [Ans: 20-400 m] c) If the height of the oxidiser tower to be built is 100 m and the exhaust flow rate is 150 m³/s, what will be the diameter of the tower? [Ans: 6.18 m]
The height and diameter of a thermal oxidiser tower, Z and D respectively, are determined by: Z = U. Tr D = 4 Qexhaust πυ Where: u = superficial velocity through the tower T₁= reaction time needed for adequate conversion Qexhaust = exhaust volumetric flow rate (outlet of oxidiser)
Transcribed Image Text:The height and diameter of a thermal oxidiser tower, Z and D respectively, are determined by: Z = U. Tr D = 4 Qexhaust πυ Where: u = superficial velocity through the tower T₁= reaction time needed for adequate conversion Qexhaust = exhaust volumetric flow rate (outlet of oxidiser)
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