Download GTU BE/B.Tech 2018 Winter 7th Sem New 2173515 Design Of Air Pollution Control System And Air Quality Modeling Question Paper

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GUJARAT TECHNOLOGICAL UNIVERSITY
BE - SEMESTER-VII (NEW) EXAMINATION - WINTER 2018

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Subject Code: 2173515 Date: 29/11/2018
Subject Name: Design Of Air Pollution Control System And Air Quality Modeling
Time: 10:30 AM TO 01:00 PM Total Marks: 70

Instructions:

1. Attempt all questions.

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

MARKS

Q.1 (a) Write a note on hydrodesulphurization of coal. 03
(b) Explain Hybrid (Lagrangian/Eulerian) Models. 04

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(c) A furnace is burning at 12 tons of 2.5% Sulphur coal/hr with an emission rate of 151 g/s. The following exist: H=120m, u=2m/s, Y=0. It is one hour before sunrise, and the sky is clear. Find the downwind ground level SO2 concentration at X=500 m, Y=0 and Z=0.(use table 3.3) 07

Q.2 (a) Draw a neat figure of cyclone separator and explain it’s working. 03
(b) Derive an equation of stocks law for gravity settler. 04
(c) Explain all methods of NOx removal. 07
OR

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(c) Write a short note on air models. 07

Q.3 (a) Explain working and principle of Electrostatic Precipitator. 03
(b) Explain working of gravity settler with appropriate figure. 04
(c) The traffic density for a highway is~1200 vehicle/hr and average vehicle speed is 80 km/hr. The average vehicle speed is 80 km/hr. The average carbon monoxide ‘emission is 40g/s. Estimate the carbon monoxide concentration 250 m and 500 m downwind on highway if wind speed normal to highway will be 2 m/s.(use table 3.3) 07
OR

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Q.3 (a) Explain cleaning mechanism in bag filter. 03
(b) Explain the Gaussian model’s assumptions and limitations. 04
(c) Explain natural removal methods for sulphur from atmosphere. 07

Q.4 (a) Explain methods of SOx removal from crude oil extraction. 03
(b) Write a note on Alkalized Alumina process. 04

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(c) Write a short note on Sea board, Girbotal process and Clause process. 07
OR

Q.4 (a) Following abbreviations stands for: VOC,PPM, POP 03
(b) Explain Chemico process with proper flow sheet. 04
(c) A plant has a 60,000acfm gas stream containing a hazardous dust with an estimated drift velocity of 0.250ft/s. The minimum required efficiency is 99.80%. Assume that the Deutsch—Anderson (DA) equation applies. LT Associates has proposed (as a control device) a tubular-type precipitator with tubes 10 inch in diameter and 10ft height. How many tubes are needed? Approximate the volume occupied by the tubes. 07

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Q.5 (a) What is avalanche mechanism? 03
(b) Write a note on photochemical model. 04
(c) Explain all steps of graphical method of cyclone seperator. 07
OR

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Q.5 (a) Explain ventury scrubber. 03
(b) Write a note on catalytic processes for sulphur removal. 04
(c) Estimate the cut diameter and overall collection efficiency of a cyclone given the particle size distribution of dust from cement kiln. Particle size distribution and other pertinent data are given below. 07

Gas viscosity = 0.02 Cp;
Specific Gravity of the particle = 3.0;

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Inlet gas velocity of cyclone = 48 ft/sec;
Effective number of turns within cyclone =5 ;
Cyclone diameter = § ft ;Cyclone inlet width =2 ft.
o= 187.2 Ib/ft

Average 1 5 10 15 20 25 30 35 >40

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Partical
Size, dp
(um)
Wt 9 15 15 25 10 10 6 3 7
Percentage

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Standard efficiency curve for a cyclone separator

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Table-3.3

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