ME 09 704-POWER PLANT ENGINEERING OCTOBER 2012 (2009 Admissions)

SUBJECT - POWER PLANT ENGINEERING

CODE -  09 704

SEMESTER - SEVENTH

BRANCH - ME

UNIVERSITY - CALICUT

YEAR - 2012

Part A

Answer all Questions

1.What is the difference between reheating and regeneration ?

2.What is the major function of economiser ?

3.Give examples for fire tube and water tube boilers.

4.What is Lime-soda process ?

5.What is meant by chain reaction ?

(5x2=10 marks)

Part B

Answer any four questions

6.What is regenerative feed water heating ? Explain with schematic diagram.

7.Define the efficiencies calculated in a steam power plant.

8.What are the measures taken to reduce pollution in a thermal power plant ?

9.What is meant by circulation in a boiler system ? Explain forced circulation system with a neat sketch^ What is circulation ratio ?

10.Explain what is Liquid Metal Fast Breeder Reactor (LMFBR).

11.What are the advantages of Circulation Fluidised Bed boilers (CFB) ?

(4x15=60 marks)

Part C

Answer all questions

12. In a combined power and process plant the boiler generates 21000 kg/hr of steam at a pressure of 17 bar and temperature 230°C. A part of the steam goes to a process heater which consumes 132.56 kW, the steam leaving the process heater 0.957 dry at 17 bar being throattled to 3.5 bar.. The remaining steam flows through a h.p. turbine which exhausts at a pressure of 3.5 bar. The exhaust steam mixes with the-process steam before entering the l.p. turbine, which develops 1337.5 kW. At the exhaust the pressure is 0.3 bar and the steam is 0.912 dry. Draw the line and T-S diagrams of the plant and determine (a) The steam quality at the exhaust of the h.p. turbine (b) the power developed by the h.p. turbine and (c) Isentropic efficiency of the hp. turbine.

Or

13. A factory requires 10 t/h of steam for process heating at 3 bar saturated and 1000 kW of power, for which a back pressure turbine of 70% internal efficiency is to be used. Find the steam condition required at inlet of the turbine. (Use Mollier chart).

14.Calculate the efficiency of a marine boiler operating under the following conditions: feed water at 50 bar and 120C is supplied to the boiler at the rate of 30 kb/s.Of this 25 kg/s leaves the superheater outlet at 40 bar and 450C and the remainder leaves the steam drum as dry saturated stem at 42 bar for auxiliary purposes.The fuel used is oil having a calorific value of 40414 MJ/m^3 and it is supplied at the rate of 7.2 m^3/h.

Or

15.Explain the functioning of any one fire tube boiler with clear sketch.

16.Explain varous losses in steam turbines.

Or

17.With the help of a neat sketch explain an Ash handling system.

18.A power plant of 210 MW installed capacity has the following particulars :

Capital Cost = Rs. 18000/kW installed.

Interest and depreciation = 12%

Annual load factor = 54%

Annual running charges = Rs.200x10^6

Energy consumed by power plant auxiliaries = 6%

Calculate :

(a) The cost of power generation/kWh.

(b) The reserve capacity

Or

19. How direct energy conversion is happened in MHD ? Give the sketch of the MHD generator

(4x10=40 marks) 

Download -