Lecture 05_PPE_Unit 2: High Pressure Boilers

Program: Diploma in Mechanical Engineering (Semester: 5)
Course: Power Plant Engineering
Lecture 5
Unit 2: High Pressure Boilers
2.3 Construction and principle of working of :-
v) Velox Boiler
vi) Ramsin Boiler


Presented by : Prof. Rushikesh Sonar, Sandip Polytechnic, Nashik

1. Program:
Diploma
(Mechanical)
Class:
TY (ME)
Semester:
V
Course:
Power Plant Engineering
Code:
22566
Code:
22566
LECTURE 05: Unit: 2. High Pressure Boilers

2. 02
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Name of the Name of the Name of the Name of the Trainer : Prof. Rushikesh Deoram Sonar Trainer : Prof. Rushikesh Deoram Sonar Trainer : Prof. Rushikesh Deoram Sonar Trainer : Prof. Rushikesh Deoram Sonar
Years of Years of Years of Years of Experience : 10 Experience : 10 Experience : 10 Experience : 10
Domain Domain Domain Domain Expertise : Mechanical Engineering Expertise : Mechanical Engineering Expertise : Mechanical Engineering Expertise : Mechanical Engineering
Qualification: M.E. (Design Engineering) Qualification: M.E. (Design Engineering) Qualification: M.E. (Design Engineering) Qualification: M.E. (Design Engineering)
Contact Details: Contact Details: Contact Details: Contact Details:
[phone] [phone] [phone] [phone]
[email protected] [email protected] [email protected] [email protected]

3. 03
Unit II: High Pressure Boilers
TOPICS COVERED IN PREVIOUS LECTURE (04):-
2.32.32.3 2.3Construction and principle of working of :- 2. Benson Boiler, 3. Loeffler Boiler 4. Schmidt-Hartmann Boiler
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TOPICS TO BE COVERED IN THIS LECTURE (04):-
2.32.32.3 2.3Construction and principle of working of :-
5. Velox Boiler
6. Ramsin Boiler

4. 04
Unit II: High Pressure Boilers
2.3.5 : VELOX BOILER :
DIAGRAM & BASICS
Types of boiler: Forced circulation, High
Pressure boiler, Water tube boiler
Steam Generating Capacity:100 tones/hour Pressure: 84 bar Temp.: 540°C
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5. 05
Unit II: High Pressure Boilers
2.3.5 : VELOX BOILER :
DIAGRAM & COMPONENTS
Various part of boiler: Various part of boiler: Various part of boiler: Various part of boiler:
wEvaporator Drum
wFeed Pump
wGas Turbine
wAir Compressor
wSuper Heater
wCombustion Chamber
w
Fuel Tank
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w
Fuel Tank
wSteam Separator

6. 06
Unit II: High Pressure Boilers
2.3.5 : VELOX BOILER :
DIAGRAM & WORKING PRINCIPLE
When the velocityof the gas is
greaterthan the speed of
sound, its heat transfer rateis
also increases.
So more heat is transferred
from gas to water as compared
with the heat transfer at the subsonic speed.
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subsonic speed.

7. 07
Unit II: High Pressure Boilers
2.3.5 : VELOX BOILER :
CONSTRUCTION
In Velox boiler, pressurized combustion is used so axial flow compressor is used which is run by gas
turbine.
The combustion chamber and evaporating tubesare arranged in such a way that the hot products fr om
combustion chamber are directly passed to annulus of evaporating tubes.
Steam separator is arranged tangential to evaporating tubes. Hot flue gases are used for running
gas turbine
, for
economizer
and for
super heater
.
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Hot flue gases are used for running
gas turbine
, for
economizer
and for
super heater
.

8. 08
Unit II: High Pressure Boilers
2.3.5 : VELOX BOILER :
WORKING
The air is compressed by air compressor driven by gas a
turbine driven. This compressed air passes from the
combustion chamber, where more heat release by the
fuel which increase the velocity of the flue gases up to
sound velocity.
From the bottomof combustion chamber, this flue
gases pass from the fire tubes. These fire tubes
surrounded by the evaporator water tubes.
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The water from the economizer passes from the
evaporator tube force by a circulating pump. This
water passes 15 – 20 time from the evaporator tube at
very high speed.
Due to this high speed circulation, heat is transfer
from the gases to the water at very high rate.
The mixture of water and steam is formed which further
passes from the water and steam separator.

9. 09
Unit II: High Pressure Boilers
2.3.5 : VELOX BOILER :
WORKING
The steamfrom the steam separator passes
to the super heater and further for process
work.
The remaining waterin the steam separator
again passes from the evaporatortube.
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The flue gases from the fire tubes send to the
super heater tubes, where it increases the
steam temperature.
The gas from the super heater sends to the
turbine where it rotates the gas turbine and
then passes from the economizer.

10. 10
Unit II: High Pressure Boilers
2.3.5 : VELOX BOILER :
PATH OF FLOW
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11. 11
Unit II: High Pressure Boilers
2.3.5 : VELOX BOILER :
ADVANTAGES
This boiler has high heat transfer rate.
It has great flexibility.
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It is Compact in design.
It is easy to control. It is fully automatic.
It has great thermal efficiencyof about 90 – 95%

12. 12
Unit II: High Pressure Boilers
2.3.5 : VELOX BOILER :
DISADVANTAGES
It can only operate on liquid or gaseous fuels.
The sizeof the Velox boiler is limited, hence the capacityis low.
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13. 13
Unit II: High Pressure Boilers
2.3.6 : RAMSIN BOILER :
DIAGRAM & BASICS
Types of boiler: Forced circulation, High
Pressure boiler, Water tube boiler
Also called ‘Once through boiler’
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Pressure: 221 bar

14. 14
Unit II: High Pressure Boilers
2.3.6 : RAMSIN BOILER :
DIAGRAM & WORKING
It is a supercritical boiler. It is very similar to Benson boiler, except
that evaporator section spiral tube instead if straight tubes. Its
water circuit is shown in Figure.
The boiler consists of inclined evaporator coil arranged in spiral 40
such coils is paralleled around the furnace.
Water is forced into the economizer by a feed water pump where it is
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Water is forced into the economizer by a feed water pump where it is heated and then it enters in spiral evaporator tube where water
flashes to steam.
Steam generated in evaporator, flows into headers and then
convection super heater.
The superheated steam is utilized for power generation.

15. 16
Unit II: High Pressure Boilers
2.3.6 : RAMSIN BOILER :
ADVANTAGES
This boiler has high heat transfer rate.
It has high thermal efficiency.
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Corrosion and erosionproblem are minimized.
It is adaptable to load fluctuations.

16. 16
Unit II: High Pressure Boilers
2.3.6 : RAMSIN BOILER :
DISADVANTAGES
It iscostlydue to increased requirement forsteelfor heat transfer surface, pump and
feed water piping.
Generation of steam using forcedcirculation, high and supercritical pressure.
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17. 17
Unit II: High Pressure Boilers
In this lesson, We have learned In this lesson, We have learned In this lesson, We have learned In this lesson, We have learned
2.2.5 Construction, Working, Adv. & Disadv. of Velox Boiler 2.2.6
Construction, Working, Adv. & Disadv. of
Ramsin Boiler
SUMMARY
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2.2.6
Construction, Working, Adv. & Disadv. of
Ramsin Boiler

18. 18
Unit II: High Pressure Boilers
Our Next Video Lecture Topic
2.5 COMPARISON OF VARIOUS TYPES OF HIGH PRESSURE BOILERS 2.4 FLUIDIZED BED COMBUSTION (FBC) BOILERS
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2.5 COMPARISON OF VARIOUS TYPES OF HIGH PRESSURE BOILERS