1. A steam boiler or generator is a closed vessel, usually made of steel, that transfers heat from fuel combustion to water to generate steam.
2. Steam can be used for engines, industrial processes like in mills and breweries, or producing hot water for heating.
3. There are many types of boilers classified by features like whether tubes contain water or fire/gases, furnace position, axis, number of tubes, circulation method, and heat source.
The boiler system comprises a feed-water system, steam system, and fuel system. The feed-water system supplies treated water to the boiler and regulate it automatically to meet the steam demand. Various valves and controls are provided to access for maintenance and monitoring.
Steam boilers, types of boilers, accessories and mountings of boilers, description of various types of boilers, description of all accessories and mountings of boiler, Fire tube and Water tube boiler, Low pressure and high pressure boilers,
once through boiler, examples, and important features of HP boilers, Mountings and accessories. Layout of a modern HP boiler. Equivalent evaporation of boilers. Boiler performance. Boiler efficiency
The boiler system comprises a feed-water system, steam system, and fuel system. The feed-water system supplies treated water to the boiler and regulate it automatically to meet the steam demand. Various valves and controls are provided to access for maintenance and monitoring.
Steam boilers, types of boilers, accessories and mountings of boilers, description of various types of boilers, description of all accessories and mountings of boiler, Fire tube and Water tube boiler, Low pressure and high pressure boilers,
once through boiler, examples, and important features of HP boilers, Mountings and accessories. Layout of a modern HP boiler. Equivalent evaporation of boilers. Boiler performance. Boiler efficiency
Try to explain about the steam generator (boiler), it has three parts. Part 1 cover the types, part 2 about its parts & auxiliaries & accessories and part 3 about performance.
Steam boiler is a closed vessel in which heat produced by the combustion of fuel is utilized to generate steam from water, at desired temperature and pressure
A boiler or steam generator is a device used to create steam by applying heat energy to water. Although the definitions are somewhat flexible, it can be said that older steam generators were commonly termed boilers and worked at low to medium pressure.
Presentation on LANCASHIRE BIOLER BY SHAKEEL AHMED.pptxbaghbana bajoi
what is Lancashire boiler?
Lancashire boiler is a horizontal drum axis, natural circulation, natural draft, two-tubular, low pressure, stationary, fire tube boiler with furnace located internally. Its main purpose is to create steam and then this steam is used to drive steam turbines for power generation. It has high thermal efficiency and it is about 80 to 90 percent. It is mostly used in locomotive engines and marines etc
=> The Lancashire Boiler works on the principle of Heat Exchanger. A Heat Exchanger is a device that is used for the transfer of heat between two or more fluids.
=> At first, water is fed uniformly to the boiler shell using the feed pump.
Before entering into the boiler, the water is preheated using the economizer which gets heat from the flue gases. This economizer increases the efficiency of the boiler.
After that, solid fuel is entered from the fire door and burnt on the grate which is present at the starting if each fire tube.
As the solid fuel is burnt, flue gases start traveling in the fire tube.
There is a small brick arc which stops ashes and burnt coal to enter into the fire tube.
As the flue gases pass through the fire tubes, these fire tubes start getting heated and the heat is transferred to the water which is surrounding the fire tube
As the heat is transferred to the water, the water starts to get converting into steam and the steam generated is transferred to the required place using the stop valve.
=> Before reaching the stop valve the steam crosses the superheater which superheats the steam before delivering it to the required place.
After passing through the firetube, the flue gases go to the bottom channel which is created in the brickwork and then the flue gases pass through the side channel.
As the flue gases pass through the channels in the brickwork, these flue gases come in contact with the boiler shell and the boiler shell gets heated and this heat is transferred to the water inside the boiler shell and the efficiency of boiler is increased.
channel and transfer heat to the superheater before passing through the chimney.
The flue gases after passing through side channels transfer the heat to the superheater and then escapes to the environment through the chimney.
=>what is Damper in boiler?
A damper, which is used to control the draft inside a boiler. ... When hot air from the boiler rises up the stack, it must be replaced by cooler air surrounding the boiler. This cooler air will push the warmer air up the stack, causing flow.
//Accessories of Lancashire boiler//
=> Economizer:
An economizer is a mechanical device that is used as a heat exchanger in the steam power plant.
It is used to pre-heat the fluid or water by taking the residual heat from the combustion products( flue gases).
It is installed to increase the efficiency of the boiler.
Try to explain about the steam generator (boiler), it has three parts. Part 1 cover the types, part 2 about its parts & auxiliaries & accessories and part 3 about performance.
Steam boiler is a closed vessel in which heat produced by the combustion of fuel is utilized to generate steam from water, at desired temperature and pressure
A boiler or steam generator is a device used to create steam by applying heat energy to water. Although the definitions are somewhat flexible, it can be said that older steam generators were commonly termed boilers and worked at low to medium pressure.
Presentation on LANCASHIRE BIOLER BY SHAKEEL AHMED.pptxbaghbana bajoi
what is Lancashire boiler?
Lancashire boiler is a horizontal drum axis, natural circulation, natural draft, two-tubular, low pressure, stationary, fire tube boiler with furnace located internally. Its main purpose is to create steam and then this steam is used to drive steam turbines for power generation. It has high thermal efficiency and it is about 80 to 90 percent. It is mostly used in locomotive engines and marines etc
=> The Lancashire Boiler works on the principle of Heat Exchanger. A Heat Exchanger is a device that is used for the transfer of heat between two or more fluids.
=> At first, water is fed uniformly to the boiler shell using the feed pump.
Before entering into the boiler, the water is preheated using the economizer which gets heat from the flue gases. This economizer increases the efficiency of the boiler.
After that, solid fuel is entered from the fire door and burnt on the grate which is present at the starting if each fire tube.
As the solid fuel is burnt, flue gases start traveling in the fire tube.
There is a small brick arc which stops ashes and burnt coal to enter into the fire tube.
As the flue gases pass through the fire tubes, these fire tubes start getting heated and the heat is transferred to the water which is surrounding the fire tube
As the heat is transferred to the water, the water starts to get converting into steam and the steam generated is transferred to the required place using the stop valve.
=> Before reaching the stop valve the steam crosses the superheater which superheats the steam before delivering it to the required place.
After passing through the firetube, the flue gases go to the bottom channel which is created in the brickwork and then the flue gases pass through the side channel.
As the flue gases pass through the channels in the brickwork, these flue gases come in contact with the boiler shell and the boiler shell gets heated and this heat is transferred to the water inside the boiler shell and the efficiency of boiler is increased.
channel and transfer heat to the superheater before passing through the chimney.
The flue gases after passing through side channels transfer the heat to the superheater and then escapes to the environment through the chimney.
=>what is Damper in boiler?
A damper, which is used to control the draft inside a boiler. ... When hot air from the boiler rises up the stack, it must be replaced by cooler air surrounding the boiler. This cooler air will push the warmer air up the stack, causing flow.
//Accessories of Lancashire boiler//
=> Economizer:
An economizer is a mechanical device that is used as a heat exchanger in the steam power plant.
It is used to pre-heat the fluid or water by taking the residual heat from the combustion products( flue gases).
It is installed to increase the efficiency of the boiler.
Hello,
I am trying to explain about Steam Generator (Boiler) in this session, due to length of said presentation, I am deciding to divide it in three parts.
Part 1 cover the “Introduction & Types of Steam Generator”
Part 2 cover about the “Parts of Steam Generator and Its Accessories & Auxiliaries” and
Part 3 cover the “Efficiency & Performance”
This is the Steam Generator (Boiler) Part 3 cover the “Design, Efficiency, Performance & Protection”.
earlier Part 1 cover the “Introduction & Types of Steam Generator”
Part 2 cover about the “Parts of Steam Generator and Its Accessories & Auxiliaries
This material provides the basic of design, operation and maintenance so that you can use this as guide line to operation, to inspect your boiler. Hope this will be benefit you.
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2. INTRODUCTION
STEAM GENERATOR OR BOILER
A steam generator or boiler is
usually a closed vessel made of steel. Its
function is to transfer the heat produced by
the combustion of fuel to water and
ultimately to generate steam.
3. The steam generated may be supplied :
1.To an external combustion engine, i.e., steam engine
and steam turbines
2.At low pressures for industrial process work in cotton
mills, sugar factories , breweries etc., and
3.For producing hot water, which can be used for
heating installations at much lower pressures
5. CLASSIFICATION OF STEAM BOILERS
Though there are many classifications of steam boilers, yet
the following are important.
1.ACCORDING TO THE CONTENTS IN THE TUBE:
a)fire tube or smoke tube boiler
b)water tube boiler.
6. ACCORGING TO POSITION OF FURNACE:
Internally fired boilers
Externally fired boilers
ACCORDING TO AXIS OF FURNACE:
Vertical boilers
Horizontal boilers
ACCORDING TO NUMBER OF TUBES:
Single tube boilers
Multi tube boilers
7. ACCORDING TO METHOD OF CIRCULATION OF
WATER:
• Natural circulation boilers
• Forced circulation boilers
ACCORDING TO THE USE
• Stationary boilers
• Mobile boilers
ACCORDING TO SOURCE OF HEAT
8. WATER TUBE STEAM BOILER:
the water is contained inside the tubes(called
water tubes)which are surrounded by flames
and hot gases from outside.
Ex: Babcock and Wilcox boiler, stirling boiler, la
- Mont boiler, yarrow boiler and loeffler boiler
9. FIRE TUBE BOILER
In fire tube steam boilers, the flames and
hot gases produced by the combustion of
fuel pass through the tubes(called multi
tubes) which are surrounded by water.
The heat is conducted through the walls
of the tube from the hot gases through the
surrounding water.
Ex: Cochran boiler, Lancashire boiler,
Cornish boiler,
10. WORKING OF AN COCHRAN
BOILER
Considered to be one of the most efficient
type multi tubular boilers.
Consists of external cylindrical shell and
fire box. The shell and fire box both are
hemispherical.
The fire box and combustion chamber is
connected through a short pipe.
The flue gases from the combustion chamber
flow to the smoke box through a
11. WORKING OF AN COCHRAN
BOILER
number of smoke tubes.
The gases from the smoke box pass to the
atmosphere through a chimney
The external diameter of pipe is 62.5mm and
are 165in number.
Manhole is provided for cleaning.
14. The boiler consists of a long cylindrical
external shell (1) built of steel plates in sections
riveted together.
It has two large internal flue tubes (2).
A fire grate (3) is also called furnace is
provided at one end of the flue tubes on which
solid fuel is burnt.
At the end of the fire grate there is a brick arch
(5) to deflect the flue gases upwards.
The hot flue gases leaving internal flue tubes
passes through the bottom tube(6).
15. These flue gases move to the front of the
boiler where they divide and flow into side
tube (7).
The flue gases then enter the main flue
(9) which leads them to chimney.
The damper (8) is fitted at one side flues
to control the draught and thus regulate the
rate of generation of steam.
A spring loaded safety valve (10) and
stop valve (11) are mounted.
16. A high steam and low water safety valve (12) is
also provided.
A perforated feed pipe (14) controlled by a feed
valve is used for feeding water uniformly.
An antipriming pipe (15) is provided to separate
out water as far as possible.
A blow-off cock (16) removes mud that settles at
the bottom of the boiler by forcing out some of the
water.
17. CORNISH BOILER
It is a similar type of Lancashire boiler in
all respects, except there is only one flue
tube in Cornish boiler instead of two in
Lancashire boiler.
The diameter of Cornish boiler is generally
1m to 2m and its length various from 5m to
7.5m.
The diameter of flue tube may be 0.6 times
that of shell.
18. CORNISH BOILER
The capacity and working
pressure of a Cornish boiler is
low as compared to Lancashire
boiler.
