GTU BE 2019 Summer Question Papers || Gujarat Technological University
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GUJARAT TECHNOLOGICAL UNIVERSITY
BE - SEMESTER-VIII(NEW) EXAMINATION - SUMMER 2019
Subject Code: 2181307 Date: 17/05/2019
Subject Name: Design of Air Pollution Control Equipments
Time: 10:30 AM TO 01:00 PM Total Marks: 70
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Instructions:
- Attempt all questions.
- Make suitable assumptions wherever necessary.
- Figures to the right indicate full marks.
| Q.1 Enlist basic selection criteria for design of air pollution control system. | 03 |
| (b) Highlights the importance of auxiliary equipment & name atleast three. | 04 |
| (c) Enlist various types of scrubbers & briefly explain any one type with neat sketch. | 07 |
| OR | |
| Q.2 Explain the significance of following terms : --- Content provided by FirstRanker.com --- 1. Saltation Velocity 2. Velocity Ratio 3. Cut size diameter | 03 |
| (b) Enlist & explain factors affecting performance of cyclone separator efficiency. | 04 |
| (c) A high efficiency cyclone with dia. of 1000 mm handles 2 m³/s of standard air carrying particles with density of 1600 kg/m³. Determine cut size dia. with gas density of 1.185 kg/m³. ( Assume µg = 1.84 x 10?5 kg/m.s ) | 07 |
| OR | |
| Q.3 Design a high efficiency cyclone of maximum particle collection efficiency for 45,000 m³/ hr of air stream at 150 ° C, considered to be flue gas releasing 650 g/s of dust. The dust mean dia. is 10µm & density of particle 1600 kg/m³. (Assume µs @ 100 ° C = 2.1 x 10?5 kg/m.s& assume suitable data) | 07 |
| (2) Define the following terms; 1. Capture Velocity 2. Minimum transport velocity3. Coefficient of Entry | 03 |
| (b) Write down the design procedure for determination of bag filter hopper bottom. | 04 |
| (c) A bag house having 10 compartments, 260 bags per compartment and each bag having a diameter of 200 mm & length is 5 m with a gas flow rate is 1,20,000 m³ / min. Calculate air — to/= cloth ratio. Assume that 2 compartment is out of service then determine percent change in A/C ratio. | 07 |
| OR | |
| Q.4 Define the following terms: 1. Air—to 03 | |
| (b) Enlist various operational & design parameters for design of bag filter. | 04 |
| (c) During a test on clean bag filter the filter drag due to dust at the end of the test period is 1000 N-min/m² and the resistance Rp of the dust built up on the cloth was found to be 30000 sec/m. The dust loading in the dirty air stream is 5g/m³. If the pressure drop increases by 10 mbar during the test, estimate the time of test period in hour. | 07 |
| Q.4 Explain the significant particulate matter removal mechanisms of venturi scrubber. | 03 |
| (b) An electrostatic precipitator with a specific collection area of 0.984 m² / m³/ min is found to have an actual overall collection efficiency of 97 %, if the specific collection area is increased to 1.312 m² / m³ min. Estimate the anticipated collection efficiency on the basis of (1) Deutsch equation (2) Hazen type equation with the value of n is equal to 4. | 04 |
| (c) A venturi scrubber is to be designed to collect particulate matter from an industrial operation. The liquid flow rate to the scrubber is 1.35 L/ m³ of air and the liquid is 91.5 m/s. The flue gas temperature is 298 K and the liquid viscosity is 1x10?³ kg/m.s. Estimate the efficiency of venturi scrubber for particle size of 10 µm. (µg=1.84 x 10?5 kg/m.s) | 07 |
| OR | |
| Q.5 Write down the equation for determination of convergent & divergent section length of venturi scrubber. | 03 |
| (b) For an Electrostatic precipitator of given geometry & operating conditions it is found that collection efficiency of 10 µm size particle is 99.8 % , on the basis of Dutch type equation , estimate collection efficiency for (1) 5 µm & (2) 0.2 µm particles. | 04 |
| (c) Write a short note on adsorption as a gaseous control equipment. | 07 |
| Q.5 Name various adsorbent for control of gaseous pollutants. | 03 |
| (b) Define adsorption & differentiate between physical & chemical adsorption. | 04 |
| (c) Enlist various types of hood along with its specific application & draw any one type of hood. | 07 |
| OR | |
| Name points to be considered while design of Duct system. | 03 |
| (b) Name various reactive & nonreactive absorbent used for control of gaseous pollutants. | 04 |
| (c) Write a short note on absorption as a gaseous control equipment. | 07 |
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