STEAM BOILER

1. LAXMI INSTTUTE OF TECHNOLOGY , SARIGAM
Element of Mechanical Engineering
Department of Mechanical Engineering

2. INTRODUCTION TO
STEAM BOILERS

3. •Introduction
•Type of boilers
•Mountings of Boiler
•Accessories of a boiler
Boiler

4. What is a Boiler?
• It’s a Closed Vessel to Produce
Steam from Water and Hot Flue Gas
by Combustion of Fuel at Desired
Pressure and Temperature.
• Vessel that heats water to become
hot water or steam
• At atmospheric pressure water
volume increases 1,600 times
• Hot water or steam used to transfer
heat to a process
Introduction

5. Type of Boilers
1. Fire Tube Boiler
• Relatively small steam
capacities (12,000
kg/hour)
• Low to medium steam
pressures (18 kg/cm2)
• Operates with oil, gas
or solid fuels

6. • Used for high steam
demand and pressure
requirements
• Capacity range of 4,500
– 120,000 kg/hour
• Combustion efficiency
enhanced by induced
draft provisions
• Lower tolerance for
water quality and needs
water treatment plan6
Type of Boilers
2. Water Tube Boiler

7. Fire Tube Boiler Water Tube Boiler

8. Advantage and Disadvantage of Water
Tube Boiler Over the Fire Tube Boiler
Advantage:
1. Large heating area of furnace.
2. Fuel is completely burnt.
3. A good and fast circulation of
water.
4. Steam can be raised more
quickly.
5. Maximum amount of heat
transfer.
6. Less floor space.
Disadvantage:
1. Overheating and bursting of
tubes.

9. Comparison Between Fire Tube and
Water Tube Boiler
Sr.
No.
Particulars Fire Tube Boiler Water Tube Boiler
1 Position of water
& hot gases
Hot gases inside the tube
& water outside the tube
Water inside the tube &
hot gases outside the
tube
2 Operating pressure Limited to 25 bar can exceed 125 bar
3 Rate of
steam
generation
Lower Higher
4 Suitability Not suitable for large
power
plant
Suitable for large power
plant
5 Floor
spac
e requirement
More Less
7 Use For producing
process
steam
For producing steam
for power generation as
well as process heating

10. Basic Parts of Boiler
1. Cylindrical shell
2. Grate
3. Furnace (Fire box)
4. Fire hole
5. Ash pit (Ash pan)
6. Smoke chamber (Smoke box)
7. Man hole
8. Hand hole
9. Mud box
10.Steam collecting pipe (Anti-priming
pipe )

11. Main Types of Boiler
• Cochran Boiler
• Lancashire Boiler
• Back And Will-Cox Boiler

13. STEAM STOP VALVE
HIGH STEAM LOW WATER
SAFETY VALVE
SAFETY
VALVEPRESSURE
GAUGE
WATER
GAUGE
MAIN SHELL
SIDE
FLUE
FIRE HOLE
FIRE
GRATE
BLOW
OFF COCK
BOTTOM
FLUE
-
TUBES
LANCASHIER BOILER
-

14. PRESSURE
GAUGE
WATER
GAUGE
SAFETY
VALVE
NON RETURN VALVE
MAN HOLE
DOW N COMER
WATER TUBES
FIRE GRATE---
!BABCOCK WILCOX BOILER