Download GTU B.Tech 2020 Winter 8th Sem 2181307 Design Of Air Pollution Control Equipments Question Paper

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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:

1. Attempt any FOUR questions out of EIGHT questions.

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2. Make suitable assumptions wherever necessary.
3. Figures to the right indicate full marks.

Q.1

1. (a) Enlist the various Physical and Chemical characteristic of dust, required to know before designing any dust Collector equipment. (3)
2. (b) List Down the various Auxiliary equipments used in air pollution control system with it purpose in brief. (4)

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3. (c) Enlist and explain the process parameters for selecting air pollution control equipment. (7)

Q.2

1. (a) Give the classification fan and State the application of fan in air pollution control system. (3)
2. (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)
3. (c) List down points that should be considered while design of HOODs? (7)

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Q.3

1. (a) Define the following terms for Fabric filter : (i) Filtering Velocity (ii) Filter drag (iii) Fabric slack (3)
2. (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)
3. (c) Design a bag filter for a flow of 5m³/sec. (7)

Q.4

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1. (a) Define the following terms: (i) Can velocity (ii) Saltation Velocity (iii) Pressure drop. (3)
2. (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

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   • Cyclone diameter = 3m
   • Cyclone inlet width = 0.75m
3. (c) Enlist and explain the various performance parameter of cyclone separator. (7)

Q.5

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1. (a) Define (a) Plate surface area (b) Drift velocity (c) Back corona (3)
2. (b) Explain the process of removing deposited dust from Electrostatic precipitator. (4)
3. (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

1. (a) Enlist the various parameters affecting the performance of venturi scrubber. (3)

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2. (b) Explain the various collection mechanisms in Particulate scrubber responsible for removal of pollutants. (4)
3. (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

Q.7

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1. (a) Make a list of adsorbents used and explain any one in brief. (3)
2. (b) Classify the Adsorption process and also give the difference between them. (4)
3. (c) Differentiate between Adsorption and Absorption process with example when used for the control of air pollution. (7)

Q.8

1. (a) Discuss about the fouling in Gas Absorption column. (3)

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2. (b) Enlist the factors that should be considered when choosing a solvent for Gas Absorption column. (4)
3. (c) Explain Packed Column as gas adsorption equipment with a neat diagram. (7)

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