Download GTU (Gujarat Technological University) BE/BTech (Bachelor of Engineering / Bachelor of Technology) 2019 Winter 8th Sem New 2181307 Design Of Air Pollution Control Equipments Previous Question Paper
Seat No.: ________ Enrolment No.___________
GUJARAT TECHNOLOGICAL UNIVERSITY
BE - SEMESTER ? VIII (New) EXAMINATION ? WINTER 2019
Subject Code: 2181307 Date: 29/11/2019
Subject Name: Design of Air Pollution Control Equipments
Time: 02:30 PM TO 05:00 PM Total Marks: 70
Instructions:
1. Attempt all questions.
2. Make suitable assumptions wherever necessary.
3. Figures to the right indicate full marks.
MARKS
Q.1 (a) Enlist the selection criteria of Air pollution control equipments and
highlight the importance of particle size distribution and process
selection.
03
(b) To determine the efficiency of pre dust collector and dust collected at
the bottom of hopper for the following data: Gas volume is 1, 00,000
m
3
/hr, temperature is 120
0
C, inlet dust concentration is 80 gm/Nm
3
,
outlet emission allowed = 100 mg/Nm
3
.
04
(c) Write a short note on cyclonic scrubber with neat sketch and how it is
differ from venturi scrubber?
07
Q.2 (a) Define following terms with design equations:
(a)Number of effective turns (b) cut size diameter (c) saltation velocity
03
(b) A cyclone has an inlet width of 0.2 m and shortest length 0.5 m,
operates at five effective turns. The gas temperature is 345K and gas
flow rate is 5 m
3
/sec. Also the average particle size is 10 ?m with
particle density 1.2 g/m
3
. The viscosity of air at 345K is 0.0745kg/m-
h. The gas density is 1.2 kg/m
3
Calculate the cut size diameter.
04
(c) Design a bag filter for a flow of 4.5 m
3
/sec. Assume A/c ratio is
0.017m/sec. Assume standard bag diameter and height.
07
OR
(c) Calculate dimensions of venturi scrubber for a collection of talc dust
with following data:
Q= 29000 m
3
/hr
Throat velocity = 60 m/sec
Assume suitable data.
07
Q.3 (a) To find out efficiency of cyclone for a dust concentration of 115 gm/
m
3
when the same cyclone has an efficiency of 90% with dust
concentration of 30 gm/ m
3
.
03
(b) A bag house filter having 10 compartments 300 bags per each
compartment and each bag having 8 m dia and 20 m in length with a
gas flow rate is 10 lakhs m
3
/min. calculate A/c ratio. Assume that 2
compartments are out of service when calculating A/C ratio.
04
(c) A conventional type cyclone has 1 m dia flow is 200 m
3
/min and
particle density is 2000 kg/m
3
. Determine
(a) Find out the collection efficiency for following particle size
distribution.
(b) Find out number of effective turns
(c) Find out inlet velocity.
Particle Size, ?m Mass fraction, mi
0-2 1.0%
07
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1
Seat No.: ________ Enrolment No.___________
GUJARAT TECHNOLOGICAL UNIVERSITY
BE - SEMESTER ? VIII (New) EXAMINATION ? WINTER 2019
Subject Code: 2181307 Date: 29/11/2019
Subject Name: Design of Air Pollution Control Equipments
Time: 02:30 PM TO 05:00 PM Total Marks: 70
Instructions:
1. Attempt all questions.
2. Make suitable assumptions wherever necessary.
3. Figures to the right indicate full marks.
MARKS
Q.1 (a) Enlist the selection criteria of Air pollution control equipments and
highlight the importance of particle size distribution and process
selection.
03
(b) To determine the efficiency of pre dust collector and dust collected at
the bottom of hopper for the following data: Gas volume is 1, 00,000
m
3
/hr, temperature is 120
0
C, inlet dust concentration is 80 gm/Nm
3
,
outlet emission allowed = 100 mg/Nm
3
.
04
(c) Write a short note on cyclonic scrubber with neat sketch and how it is
differ from venturi scrubber?
07
Q.2 (a) Define following terms with design equations:
(a)Number of effective turns (b) cut size diameter (c) saltation velocity
03
(b) A cyclone has an inlet width of 0.2 m and shortest length 0.5 m,
operates at five effective turns. The gas temperature is 345K and gas
flow rate is 5 m
3
/sec. Also the average particle size is 10 ?m with
particle density 1.2 g/m
3
. The viscosity of air at 345K is 0.0745kg/m-
h. The gas density is 1.2 kg/m
3
Calculate the cut size diameter.
04
(c) Design a bag filter for a flow of 4.5 m
3
/sec. Assume A/c ratio is
0.017m/sec. Assume standard bag diameter and height.
07
OR
(c) Calculate dimensions of venturi scrubber for a collection of talc dust
with following data:
Q= 29000 m
3
/hr
Throat velocity = 60 m/sec
Assume suitable data.
07
Q.3 (a) To find out efficiency of cyclone for a dust concentration of 115 gm/
m
3
when the same cyclone has an efficiency of 90% with dust
concentration of 30 gm/ m
3
.
03
(b) A bag house filter having 10 compartments 300 bags per each
compartment and each bag having 8 m dia and 20 m in length with a
gas flow rate is 10 lakhs m
3
/min. calculate A/c ratio. Assume that 2
compartments are out of service when calculating A/C ratio.
04
(c) A conventional type cyclone has 1 m dia flow is 200 m
3
/min and
particle density is 2000 kg/m
3
. Determine
(a) Find out the collection efficiency for following particle size
distribution.
(b) Find out number of effective turns
(c) Find out inlet velocity.
Particle Size, ?m Mass fraction, mi
0-2 1.0%
07
2
2-4 9.0%
4-6 10.0%
6-10 30.0%
OR
Q.3 (a) To find out the height of hopper for cement kiln applications have top
face dimensions 6m x 6m, width of opening for rotary air lock valve is
0.35m and valley angle is 60
0
.
03
(b) Calculate the inertial impaction parameter for particles of 4.5?m and
specific gravity of 1.1 in air stream at ambient condition (viscosity =
1.19 x 10
-5
kg/m.sec) the aerosol is flowing past a 256 5?m diameter
spherical collector at a relative velocity of 95 m/sec. the liquid to gas
ratio is 1.5 L/m
3
.
04
(c) A bag house to be constructed to control emissions from a grain
elevator. The filter bags to be used measure 0.3m in dia and 6 m in
length. The system is used to control 21 m
3
/sec of air flow. The A/c
ratio is 0.0152m/sec.
Determine:
(a) No. of Bags
(b) No. of bags in each compartment
(c) Find out filtration time if tc = 2.5 min and tr = 9 min.
07
Q.4 (a) Dust has particles with migration velocity of 0.25 m/sec. for a total air
flow of 65 m
3
/sec, what must be number of collecting plates each
having area of 50 m
2
. Assume collection efficiency to be 95 %.
03
(b) An electrostatic precipitator with a specific collection area 0.9 m
2
/m
3
/min is found to have an actual overall collection efficiency of 98%.
If the value of A/Q increases to 1.312 m
2
/m
3
/min. estimate the
anticipated collection efficiency on the basis of deustch and hazen
equation. The n value is 4.
04
(c) Enlist and explain the operation & maintenance issues of Electrostatic
precipitator.
07
OR
Q.4 (a) For a fixed drift velocity and volumetric flow rate what percentage
change in electrode collection area is required, to increase the
collection efficiency from 90-95%.
03
(b) You have requested to calculate the collection efficiency of an ESP
containing 3 ducts with plates of a given size, assuming a uniform
distribution of particles. Also find the collection efficiency if one duct
is fed 50 % and other is 25%.
Q= 114 m
3
/min, w= 0.12 m/sec, size of plates 3.7 m long and 3.7 depth,
plate to plate spacing is 305 mm.
04
(c) Enlist and explain the operation & maintenance issues of venturi
scrubber.
07
Q.5 (a) Enlist and explain the sources of dust generation. 03
(b) Give the difference between ID fan and FD fan 04
(c) Differentiate between Adsorption and Absorption. 07
OR
Q.5 (a) Define following terms:
(a) Absolute pressure (b) Gauge Pressure (c) Static Pressure
03
(b) Enlist the various types of hoods and explain any one with neat sketch. 04
(c) Write a short note on Absorption tower with neat sketch. 07
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This post was last modified on 20 February 2020