High Pressure Utility Boiler B.E Question Paper : jaduniv.edu.in
Name of the University : Jadavpur University
Department : Power Engineering
Degree : B.E
Subject Name : High Pressure Utility Boiler
Year/Sem : IV/I
Website : jaduniv.edu.in
Document Type : Model Question Paper
Download Model/Sample Question Paper : https://www.pdfquestion.in/uploads/dspace.jdvu.ac.in/6156-High%20Pressure%20Utility%20Boiler.pdf
High Pressure Utility Boiler Question Paper :
Bachelor Of Power Engg. Examination, 2011 :
(4th Year, 1st Semester)
Time : Three hours
Full Marks : 100
Related : Jadavpur University Analysis of Electrical Machines M.E Question Paper : www.pdfquestion.in/6155.html
Answer any five questions. :
1. a) Why are supercritical units preferred for a high capacity steam power plant? 4
b) Explain the mode of fluid circulation for supercritical boiler at different load conditions. 4
c) Describe main features of a supercritical boiler. 6
d) Describe stort up and operating modes of a supercritical boiler. 6
2. a) Why does quality of drum water differs from feed water for a subcritical boiler? 4
b) Why is best quality of water is preferred for a supercritical units? 4
c) Describe different methods of internal treatment of boiler water. 8
d) What are the equipment used for infection of chemical in boiler water.
3. a) What are the selection criteria for boiler quality steels? 8
b) What materials are used for manufacture of superheater and reheater of a high capacity boiler? 4
c) Final super heates inlet header of diameter 220mm size is located in connection area of furnace. Operating presoure of heads is 170.0 Borg and temperature is 5000C. Calculate minimum safe thickness with following data.
i) Design code IBR
ii) Minimum specified tensite stress at room temperature is
490 N/mm2 0.2% proof stress
AT 5000C is 190 N/mm2
At 5500C is 168 N/mm2
Average stress to produce nufture in 100,000 hours at temperature
5300C 98 N/mm2
5400C 84 N/mm2
iii) Drill hole position is shown in SKETCH-1 Assume corrosion allowance 0.5 mm and tube manufacturing allowance ± 7.5%.
4. a) Write thermal balance equation for furnace section of a coal fired boiler. 4
b) Name and explain role of different heat release ratio used for design of furnace. 3
c) What is meant by fuel entry zone of boiler? What are its essential features and also explain design criteria of this ZONE? 3
d) Describe constructional features of different types of furnace walls.
5. a) Describe why and how different sections of economiser superheats and reheater banko are located in boiler. 10
b) How fluid side pressure drop is calculated? Explain. 4
c) 198 Tons of steam is flowing through a pipe per hour. Pressure and temperature of steam is 130.43 Berg and 5400C. Establish pipe size assuming fluid velocity of 50 m/sec. Also estimate pressure droft over a length 200m. Pipe will have 8 sends of 900degree angle and 2 volums at inlet and outlet ends. Assume friction fector 0.20 all coefficient of loss for per each bend is 0.28 and loss per value is 0.96. 6
6. a) Explain how different properties of ash affect design. Explain method of design of clean furnace with different types of coal. 10
b) Name the equipment that is selected on the basis of volatile motter of coal. Describe how low volatile coal can be bunt successfully in boiler . 5
c) How effect of atmospheric pollutent can be minimised?
7. Write a few lines on : 4×5
a) Circulating pump assioting natural circulation
b) Luminious and non luminious radiation
c) Heathy internal deposit of tube
d) Interactive chemistry Management system.
PE/T/414B High Pressure Utility BoilerSyllabus :
Types and features of High Pressure Boiler. Specification of a Power Station Boiler. Sub and Supercritical Pressure Large Boiler features, Comparison, Advantages and Disadvantages.Heat Loss and Efficiency calculation. Economizer, Superheater, Reheater Heat Transfer, Pressure Drop calculation. Boiler performance and problems of part load operation. Circulation, Natural, Forced, Assisted.
Furnace Design, Heat Input. Materials of Boiler Tubes, Drum, Header. Thickness calculation of Superheater, Drum, Headers. Water Chemistry of High Pressure Boiler. Effect of Coal & Ash Quality on Boiler design and performance. Internal and External deposits of Boiler. ID, FD, PA Fan specification & selection. Boiler Mountings. Boiler Insulation. Thermal expansion of Boiler. Boiler structure & supports.