Question

QUESTION 1 (5) 1.1. Name the main different parts of a boiler. 1.2. Blow down can be done in two ways discuss the two ways and name the preferred method and state why? 1.3. A boiler supplies 6500 kg/h wet steam at a pressure equal to 1 MPa with a dryness fraction of 0.9 from supply water at 39.0°C while using 700 kg fuel with a calorific value of 32 MJ/kg. Calculate: 1.3.1. The thermal efficiency of the boiler (6) 1.3.2. The equivalent evaporation at 100°C (3) [Q1 = 18 marks)

Answer 1

Roilers Main laut Rennast ID SED Fan Heat anchangers Combustion chamber Fuel LowCES Blow down done in too ways Continuous blow down 1.2.1 Intermediate blow down. Continuous blow down = it is continuous Removing from the drum From Removing impunity Cilica). Nabour Heam drwm I liquid C.BoD taken at some Height of drum at which Liquid Just Convent in vobur C.B:D decrease de corense efficiency toksin Far Equipment dafety [twi bine bladabecause is Cain obmago turbines blode that's CBD C.B.D done. bottom incrouse, it is done when the concentration both dilica in it is not a continuous process it is dons in in [8 to R How's] Par 10-12 min. filica 9 TBD other imposity Removed any by

Date 5707491 3600 4263-19433 kr/st Now total by fuel Now far fuel mifuel = 7oong/route calasific value="z2m3 lng Bexigua fung Enengy Generated 32x70x700 Jo Fuel should be = Foung/ wawr Showr 22400000 kHows Now fan bailey efficiengy total Energy given to tam by boiler total energy consumed berom the fuel by w 1570749976 الأرز •70722.76 mg = 70.12%. RYO 0000

Date. to stremin Equivalent syaburation mais Asteam Gemena traben Howl X Meat subblica Heat Subblitd. Far, Steam Gerengation at too's fo 2.539 kalfing waten (Latent Heat = 256.9 Now Equivalt vabanation 8500 X 2416284 32569 Equivalent cughănation = 6959.7676 6959_7646 39 (107 seg for the

Date lunur given that Bailey outbut= 6500 kg Juower team at Preacuna 29 Boiler inbut= 30°c 396 Sika in = 650dighede vir 1500kg now 112 P2 / MPa x=.g for spliciency Have to 2780.71 By stam table. 781 by his hung Nou lat za kafung find out enthing of Beth jishe streams Sahlby el va bon thing or Liquid Cathry of water of water at 39c s 1 MPa = 164.244. [calculation at Boiler's output hunt1-hhL 2180.71X9 +0X781434 25021639 + 78.1434 2680.7824 total enthlly change of dystem. Now flutus TH म ΔΗ. total Energy generated by this 2880:2824-24 21&SINKI mah EM 1991 SA