GTU B.Tech 2020 Winter Question Papers || Gujarat Technological University
GUJARAT TECHNOLOGICAL UNIVERSITY
BE- SEMESTER-VIII (NEW) EXAMINATION — WINTER 2020
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Subject Code:2181307 Date:28/01/2021
Subject Name:Design of Air Pollution Control Equipments
Time:02:00 PM TO 04:00 PM Total Marks: 56
Instructions:
- Attempt any FOUR questions out of EIGHT questions.
- Make suitable assumptions wherever necessary.
- Figures to the right indicate full marks.
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Q.1
- (a) Enlist the various Physical and Chemical characteristic of dust, required to know before designing any dust Collector equipment. (3)
- (b) List Down the various Auxiliary equipments used in air pollution control system with it purpose in brief. (4)
- (c) Enlist and explain the process parameters for selecting air pollution control equipment. (7)
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Q.2
- (a) Give the classification fan and State the application of fan in air pollution control system. (3)
- (b) The tests show that filtration of a dusty air stream containing 4.5 g of particulate matter per cubic meter of air. The air flow rate is 0.085 m³/min per square meter of filtering surface. If the exhaust volume rate is 28m³/min, calculate the number of bag required having 0.3m diameter by 6m long. (4)
- (c) List down points that should be considered while design of HOODs? (7)
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Q.3
- (a) Define the following terms for Fabric filter : (i) Filtering Velocity (ii) Filter drag (iii) Fabric slack (3)
- (b) A filter with 6100m² of surface area is used to clean 55 m³/s of air which has dust loading of 5g/m³. The values of R and K are 22000kg/m².s and 41000sec?¹ respectively. If it is desirable for the overall pressure drop not exceed 400 kg/m². Determine the maximum allowable cleaning period in hours. (4)
- (c) Design a bag filter for a flow of 5m³/sec. (7)
Q.4
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- (a) Define the following terms: (i) Can velocity (ii) Saltation Velocity (iii) Pressure drop. (3)
- (b) Calculate the cut size diameter of a cyclone. Necessary data are as below. (4)
- Gas viscosity :2 x 10?5 kg/ms
- Density gravity of the particle =2.9 g/cm³
- Inlet gas velocity to cyclone = 15m/s
- Effective numbers of turns within cyclone =5
- Cyclone diameter = 3m
- Cyclone inlet width = 0.75m
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- (c) Enlist and explain the various performance parameter of cyclone separator. (7)
Q.5
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- (a) Define (a) Plate surface area (b) Drift velocity (c) Back corona (3)
- (b) Explain the process of removing deposited dust from Electrostatic precipitator. (4)
- (c) An electrostatic precipitator is to be constructed to remove fly ash particles from stack gases at a flow rate of 10 m³/s. On the basis of laboratory tests, the drift velocity can be taken as w=3.0x 10?5 dp m/sec. Determine the plate area required to collect a 0.5 µm particle with (a) 90 % efficiency (b) 99 % efficiency (7)
Q.6
- (a) Enlist the various parameters affecting the performance of venturi scrubber. (3)
- (b) Explain the various collection mechanisms in Particulate scrubber responsible for removal of pollutants. (4)
- (c) Particulate matter laden gas is allowed to pass through a Venturi Scrubber. The liquid flow rate to the scrubber is 1.35 L/m³ of air and the relative velocity of gas to liquid is 91.5 m/s. The gas is air at standard temperature 298 K and particle density 1500 kg/m³ with a flow rate of 1.6m³ /s. Determine the efficiency of the scrubber of the composition of dust as given below. Also determine dimension of Venturi scrubber. (7)
Diameter Of particle (µm) 0.1 0.2 0.3 0.5 0.7 1 2 5 Mass fraction (mi) 0.03 0.05 0.08 0.1 0.12 0.15 0.2 0.27
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Q.7
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- (a) Make a list of adsorbents used and explain any one in brief. (3)
- (b) Classify the Adsorption process and also give the difference between them. (4)
- (c) Differentiate between Adsorption and Absorption process with example when used for the control of air pollution. (7)
Q.8
- (a) Discuss about the fouling in Gas Absorption column. (3)
- (b) Enlist the factors that should be considered when choosing a solvent for Gas Absorption column. (4)
- (c) Explain Packed Column as gas adsorption equipment with a neat diagram. (7)
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