4. [Scrubber]. A coal-fired combustion system produces flue gas that contains particulate matter. To reduce the amount of particles, the flue gas is treated in a scrubber. The measurement of the mass and size of the particles at the inlet and outlet of the scrubber yielded the size distribution data given in the following table: Particle diameter [um] (size interval: dtower → dupper) 0.1 → 0.25 0.25 → 0.5 0.5 → 1.0 1.0→2.0 2.0 → 5.0 5.0 → 10 10 →30 Formulas for question 4: Particle mass at scrubber inlet [mg] 623 55.4 31.4 33.2 123 394 775 1055 - 30→ 50 4.3 The mass of particles in each size interval was measured on a basis of 1 m³. a) What is the overall efficiency of the scrubber? [Ans: noverall 96.7 %] b) Calculate the collection efficiency (na,i) of the scrubber and the particle geometric average diameter (dpi) for each size interval. Create a graph showing the variation of na,i with dp,i. (PTO) • particle geometric average diameter. dp,i = efficiency: nd,i (%) = Particle mass at scrubber outlet [mg] c) Calculate the mass-average diameter of the particles (dp) entering and leaving the scrubber. [Ans: dp inlet = 18.7 μm; dp outlet = 3.9 µm] 21.7 32.3 12.6 8.9 7.1 7.7 6.6 dupper dlower [m¡ (in) - m¡ (out)]. m¡ (in) m₁ = mass of particles in size range i, entering or leaving the scrubber x 100, with: Σ(mi-dpi) mass-average diameter of the particles: dp with: M M = total mass of particles entering or leaving the scrubber 1
4. [Scrubber]. A coal-fired combustion system produces flue gas that contains particulate matter. To reduce the amount of particles, the flue gas is treated in a scrubber. The measurement of the mass and size of the particles at the inlet and outlet of the scrubber yielded the size distribution data given in the following table: Particle diameter [um] (size interval: dtower → dupper) 0.1 → 0.25 0.25 → 0.5 0.5 → 1.0 1.0→2.0 2.0 → 5.0 5.0 → 10 10 →30 Formulas for question 4: Particle mass at scrubber inlet [mg] 623 55.4 31.4 33.2 123 394 775 1055 - 30→ 50 4.3 The mass of particles in each size interval was measured on a basis of 1 m³. a) What is the overall efficiency of the scrubber? [Ans: noverall 96.7 %] b) Calculate the collection efficiency (na,i) of the scrubber and the particle geometric average diameter (dpi) for each size interval. Create a graph showing the variation of na,i with dp,i. (PTO) • particle geometric average diameter. dp,i = efficiency: nd,i (%) = Particle mass at scrubber outlet [mg] c) Calculate the mass-average diameter of the particles (dp) entering and leaving the scrubber. [Ans: dp inlet = 18.7 μm; dp outlet = 3.9 µm] 21.7 32.3 12.6 8.9 7.1 7.7 6.6 dupper dlower [m¡ (in) - m¡ (out)]. m¡ (in) m₁ = mass of particles in size range i, entering or leaving the scrubber x 100, with: Σ(mi-dpi) mass-average diameter of the particles: dp with: M M = total mass of particles entering or leaving the scrubber 1
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
Problem 1.1P
Related questions
Question
![4. [Scrubber]. A coal-fired combustion system produces flue gas that contains particulate matter. To
reduce the amount of particles, the flue gas is treated in a scrubber. The measurement of the
mass and size of the particles at the inlet and outlet of the scrubber yielded the size distribution
data given in the following table:
Particle diameter [um]
(size interval: dlower → dupper)
0.10.25
0.25 → 0.5
0.5 → 1.0
1.0→2.0
2.05.0
Formulas for question 4:
.
Particle mass at
scrubber inlet [mg]
623
55.4
12.6
8.9
7.1
5.0 10
7.7
10 →30
6.6
30→ 50
4.3
The mass of particles in each size interval was measured on a basis of 1 m²³.
31.4
33.2
123
a) What is the overall efficiency of the scrubber?
[Ans: noverall 96.7 %]
b) Calculate the collection efficiency (na,i) of the scrubber and the particle geometric average
diameter (dpi) for each size interval. Create a graph showing the variation of na,i with dp,i.
(PTO)
efficiency: nd,i (%) =
-
394
775
1055
c) Calculate the mass-average diameter of the particles (dp) entering and leaving the
scrubber.
[Ans: dp inlet 18.7 μm; dp outlet = 3.9 μm]
Particle mass at
scrubber outlet [mg]
particle geometric average diameter. dp,i = √d₂
21.7
32.3
√dupper dlower
[m¡ (in) - m¡ (out)]
m¡ (in)
m₁ = mass of particles in size range i, entering or leaving the scrubber
x 100, with:
Σ(mi'dp,i)
=
mass-average diameter of the particles: dp
with:
M
M = total mass of particles entering or leaving the scrubber
1](/v2/_next/image?url=https%3A%2F%2Fcontent.bartleby.com%2Fqna-images%2Fquestion%2Fde55ad6b-27eb-44c5-bca1-afdb32f2dfc7%2Fc48fc17c-f352-4f2e-8e06-d9282b654a5e%2F2hm3mrk_processed.png&w=3840&q=75)
Transcribed Image Text:4. [Scrubber]. A coal-fired combustion system produces flue gas that contains particulate matter. To
reduce the amount of particles, the flue gas is treated in a scrubber. The measurement of the
mass and size of the particles at the inlet and outlet of the scrubber yielded the size distribution
data given in the following table:
Particle diameter [um]
(size interval: dlower → dupper)
0.10.25
0.25 → 0.5
0.5 → 1.0
1.0→2.0
2.05.0
Formulas for question 4:
.
Particle mass at
scrubber inlet [mg]
623
55.4
12.6
8.9
7.1
5.0 10
7.7
10 →30
6.6
30→ 50
4.3
The mass of particles in each size interval was measured on a basis of 1 m²³.
31.4
33.2
123
a) What is the overall efficiency of the scrubber?
[Ans: noverall 96.7 %]
b) Calculate the collection efficiency (na,i) of the scrubber and the particle geometric average
diameter (dpi) for each size interval. Create a graph showing the variation of na,i with dp,i.
(PTO)
efficiency: nd,i (%) =
-
394
775
1055
c) Calculate the mass-average diameter of the particles (dp) entering and leaving the
scrubber.
[Ans: dp inlet 18.7 μm; dp outlet = 3.9 μm]
Particle mass at
scrubber outlet [mg]
particle geometric average diameter. dp,i = √d₂
21.7
32.3
√dupper dlower
[m¡ (in) - m¡ (out)]
m¡ (in)
m₁ = mass of particles in size range i, entering or leaving the scrubber
x 100, with:
Σ(mi'dp,i)
=
mass-average diameter of the particles: dp
with:
M
M = total mass of particles entering or leaving the scrubber
1
Expert Solution
This question has been solved!
Explore an expertly crafted, step-by-step solution for a thorough understanding of key concepts.
Step 1: Determine a)Overall efficiency b)collection efficiency and particle geometric dia c)mass average dia
VIEWStep 2: Calculate overall efficiency of the scrubber.
VIEWStep 3: Calculate collection efficiency and geometric average diameter for every interval and plot graph.
VIEWStep 4: Calculate mass average diameter of the particles.
VIEWSolution
VIEW
Step by step
Solved in 5 steps with 25 images
Recommended textbooks for you
Introduction to Chemical Engineering Thermodynami…
Chemical Engineering
ISBN:
9781259696527
Author:
J.M. Smith Termodinamica en ingenieria quimica, Hendrick C Van Ness, Michael Abbott, Mark Swihart
Publisher:
McGraw-Hill Education
Elementary Principles of Chemical Processes, Bind…
Chemical Engineering
ISBN:
9781118431221
Author:
Richard M. Felder, Ronald W. Rousseau, Lisa G. Bullard
Publisher:
WILEY
Elements of Chemical Reaction Engineering (5th Ed…
Chemical Engineering
ISBN:
9780133887518
Author:
H. Scott Fogler
Publisher:
Prentice Hall
Introduction to Chemical Engineering Thermodynami…
Chemical Engineering
ISBN:
9781259696527
Author:
J.M. Smith Termodinamica en ingenieria quimica, Hendrick C Van Ness, Michael Abbott, Mark Swihart
Publisher:
McGraw-Hill Education
Elementary Principles of Chemical Processes, Bind…
Chemical Engineering
ISBN:
9781118431221
Author:
Richard M. Felder, Ronald W. Rousseau, Lisa G. Bullard
Publisher:
WILEY
Elements of Chemical Reaction Engineering (5th Ed…
Chemical Engineering
ISBN:
9780133887518
Author:
H. Scott Fogler
Publisher:
Prentice Hall
Industrial Plastics: Theory and Applications
Chemical Engineering
ISBN:
9781285061238
Author:
Lokensgard, Erik
Publisher:
Delmar Cengage Learning
Unit Operations of Chemical Engineering
Chemical Engineering
ISBN:
9780072848236
Author:
Warren McCabe, Julian C. Smith, Peter Harriott
Publisher:
McGraw-Hill Companies, The