boileroverview is all about boiler functioning

1
BOILER
Brief Introduction
Rajneesh Vachaspati

2
BOILER
In General, A boiler is a closed pressure vessel strongly constructed
of steel or iron where water is converted to steam by application of
heat.
According Indian Boilers Act, 1923, -
“Boiler" means a pressure vessel in which steam is generated for use
external to itself by application of heat which is wholly or partly
under pressure when steam is shut off but does not include a
pressure vessel,-
(i) with capacity less than 25 litres (such capacity being measured
from the feed check valve to the main steam stop valve);
(ii) with less than one kilogram per centimetre square design gauge
pressure and working gauge pressure; or
(iii) in which water is heated below one hundred degrees centi-grade;

3
Usage of Boiler
• In Power Sectors
 In Independent Power Plant(IPP) &
Captive Power Plant(CPP).
• In Process Plants
 In Oil Refineries, Paper Industry, Sugar
Industry, Chemical Industry, Rice mill,
Steel Industry etc.

4
Criteria Types
Content of Tube Fire Tube Boiler, Water Tube Boiler
Type of firing Solid, Liquid & Gas Fired
Type of Circulation Natural Circulation, Natural Assisted
or Controlled Circulation, Forced
Circulation
Steam Pressure Sub Critical Boiler, Super Critical
Boiler
Draught Natural Draught, Mechanized
Draught(Forced, Induced, Balanced)
Classification of Boiler

Content of Tubes
Fire Tube Water Tube
In fire tube boiler hot flue
gas will be moved inside
the tubes & water outside
the tube.
In fire tube boiler mode
of firing is generally
internally fired.
In fire tube boiler
operating pressure limited
to 25 kg/cm²
In water tube boiler
water will be moved
inside the tube & hot
flue gases outside the
tubes.
Mode of firing is
externally fired.
Operating pressure
can exceed 125 kg/cm²
or more
5

FIRE TUBE
BOILER
WATER
TUBE
BOILER
6

Monnet Power Company Ltd 7
Type of Firing
AFBC CFBC PC Fired WHRB
Atmospheric
Fluidized Bed
Combustion
Bed Material Used
– Crushed
Refractory( + 0.8
mm to -2.8 mm)
Velocity – 3-5
m/sec
Coal – F-Grade,
Washery Reject
Combustion Eff-
80-85%
Circulating
Fluidized Bed
Combustion
Bed Material Used -
Crushed Refractory (
+ 0.8 mm to -2.8 mm)
 Velocity – 7-8 m/s.
Coal – F-Grade,
Washery Reject
 Combustion Eff.-
95 %
Waste Heat
Recovery
Boiler
Waste Heat
from Flue Gas
of Other
process used
in boiler for
Steam
generation
Pulverized
Coal Fired
Boiler.
Coal : F
Grade(3000-
3500 Kcal/Kg)
Size is 65µto
80µ.
No Bed is
Required
Combustion
Eff : 99 %
Solid Liquid Gas

AFBC CFBC
WHRB PC Fired

9
Type of Circulation
Natural
Circulation
Forced
Circulation
Assisted/Controlled
Circulation
Density
Difference is the
driving force.
Limited to boiler
with drum
operating
pressure around
175 kg/cm2(g).
Mechanical
pumps are used
to over come the
frictional losses
Operating
pressure is above
224.6 kg/cm2(g)
Beyond 175 kg/cm2(g)
pressure in a re circulation
system, circulation through
the evaporator is to be
assisted with mechanical
pumps to overcome
frictional losses in the
tubes. A pump called boiler
circulation pump will be
placed in the down comer
between the Drum & water
wall ring header to do this
function is called
controlled circulation.

10
Drum Drum
ECO
SH
ECO
SH
Furnace
Wall
Furnace
Wall
Distribution
Header
Distribution
Header
CC
Pump
Natural
Circulation
Forced Circulation
Assisted
Circulation
BCP
SH
Economiser
WW
Separator
Water
from
Feed
Station

11
Steam Pressure
Sub Critical Boiler Super Critical Boiler
Boilers Operating below the
Critical Pressure(224.6
kg/cm2(g)).
These are recirculation type or
once through .
Steam Drum is required to
separate water & steam.
Boilers Operating above Critical
Pressure (224.6 kg/cm2(g)) &
Critical Temp (374 0
C)
These are only Once Through
Type.
Drum is not required as cycle
medium is a single phase fluid
having homogenous property.

12
DRAUGHT
Natural Draught Mechanized Draught
The draught
required for the flow
of air & gas inside
the boiler is created
by chimney alone
Forced
Balance
d
Induced
Here Fans are
used to draw air
from atmosphere
& push into the
furnace.
The entire boiler
will be kept
above
atmospheric
pressure
Fans installed at
the outlet of
boiler, evacuate
the gases from
furnace. So a
negative Pr. Is
developed in
furnace & air from
atmosphere
enters the furnace
Both Forced
& Induced
draught fans
are used to
derive the
benefits of
both
systems.

13
Boiler Mountings
• Safety Valves
• Feed Check Valves
• Pressure Gauge
• Drum Water Level gauge
• Blow Down Valve
• Main Stop Valve…etc
Boiler Mounting are basically used for
safe operation of Boiler.

14
Description of Boiler Mountings
• Safety Valve : The Function of a safety valve is to blow off steam when the
pressure in the boiler exceeds the working pressure.
• Feed Check Valve : A feed check valve is used to control the supply of feed
water to boiler & also to act as a non-return valve.
• Pressure Gauge : Pressure gauge indicates the pressure of steam in a boiler.
• Drum Water Level Gauge : The Function of water gauge glass is to indicate the water
level in the Drum.
• Blow Down Valve : Blow down Valves are designed for continuous use to control the
concentration of dissolved solids in boiler water.
• Main Stop Valve : Function of a steam stop valve is to stop or allow the flow of steam
from the boiler to Main Steam line.

Specification of Boiler
(Monnet Power Company Ltd)
 Maker : Bharat Heavy Electricals Ltd
 Boiler Maker No : 0675,0676
 Type : Controlled Circulation, Sub Critical, Two Pass, Single Reheat,
Balance draught, Tangential PC Fired.
 Boiler Rating : 51793 m2
 Boiler Drum Design Pressure : 210 kg/cm2(g)
 Boiler Hydrotest Pressure : 315 kg/cm2(g) ,(For RH-78 kg/cm2(g) )
 Boiler Drum Design Temp : 369 O
C
 Steam flow at SHO: 1700TPH
 Steam pressure at SHO: 192.2 kg/cm2(g)
 Steam temperature at SHO: 540O
C
 Reheat Steam flow: 1468.1TPH
 Steam pressure at RHI: 52.4 kg/cm2(g)
 Steam temperature at RHI: 337O
C
 Steam pressure at RHO: 52.4 kg/cm2(g)
 Steam temperature at RHO: 540O
C
 Boiler Efficiency: 86 %
15
Monnet Power Company Ltd

Boiler Pressure parts
The Following parts generally comes under this
category –
• Drum
 Economiser
 Water Walls
 Radiant Roof Tubes
 Steam Cooled Walls
 LTSH Coil
 Div Panelette SH
 Platen SH
 Rehaeter Coil Assy.
16

Water Circuit
ECO
Feed
Pipe
ECO I/L
Header
ECO Coil
ECO O/L
Header
ECO
Link
DRUM
Down
Comer
Bottom
Ring
Header
Water
Wall
Tubes
Water
Wall
Outlet
Headers
Feed
Water
Station
19

20
BOILER DRUM
 In a Sub-Critical re-circulation boiler, the
drum plays an important role. In the erection
of a Power Boiler, the lifting of the Boiler
Drum is the first mile stone activity.
 The Functions of Drum are
 Separation of saturated steam from the steam-
water mixture produced by evaporating tubes.
 Mixing feed water from economiser and water
separated from steam-water mixture, and re-
circulate through the evaporating tubes
 Carrying out blow down for reduction of boiler
water dissolved solid concentration.
 Treatment of Boiler Water by chemicals

21
TECHNICAL DATA OF DRUM
Design Pressure 210 kg/cm2(g)
Operating Pressure 197 kg/cm2(g)
Water Holding Capacity 60 m3
Design Temperature 369 0
C
No of Cyclone Separator 92(46X2)
No of Secondary Drier 124
OD of Drum 1778 mm
Thickness
(Straight Portion/Dished Portion)
155 mm
Weight of Drum without Internals 214.7 MT

22
Feed
Nozzle
DC
Nozzle
Safety
Valve
Stub
Riser
Stub
SH
Conn
Pipe
Stubs
1
2
Taping No Details Qty(In Nos)
1 DWLG & EWLI 15 (Both Side)
2 Test Tapings 4
3 Air Vent 2
4 Chemical Feed Nozzle 1
5 DWLG & EWLI 15 (Both Side)
6 CBD 1
3
4
5
6
Monnet
Power
Company
Ltd

23
The main components of Boiler Drum:
 Turbo separator
 Screen Dryer
 Baffle Plate
 Anti Vertex Spider
STAGES OF STEAM & WATER SEPARATION :
 Separation takes place in the concentric cylinder of Turbo separator.
 The second stage of separation takes place in the corrugated sheets
connected to the top of the Turbo separator.
 The third and final stage of separation takes place in Screen Driers.
 The Anti Vertex spider is provided at the inlet of Down comer to avoid
whirl formation in DC.

Turbo
Separato
r(2X46)
Separating
Chamber
Feed Header
Drier Assembly(62X2)
Feed Nozzle
DC Nozzle
24
Drum Internals of MPCL
Boiler

TURBO SEPERATOR
25

Economiser System
O Application of economisers is to capture the heat from
flue gas and transfer it to the feed water. This raises the
temperature of the boiler feed water, lowering the
needed energy input, in turn increases efficiency.
O Total System Consists of ECO feed line, Eco I/L Header,
ECO Coil Assy, ECO O/L Hdr, ECO Link to Drum.
TECHNICAL DATA
No of Banks 3 Banks( 92 Sets)
Total Heating Surface of ECO
System
20,000 Sq. Mtr
Total Water Holding Capacity 150 m3
26

Description Size
(DiaXThick)
(In mm)
Design Temp( 0
C) Design Pressure
(kg/cm2(g))
ECO Feed Pipe 457.2X50 283 219.7
ECO Inlet
Header
508X65 283 215
ECO Coil 38.1X4.5 336 215
ECO Outlet
Header
406.4X60 353 210.8
ECO Link to
Drum
368X40
323.9X36
357 210.8
27

ECONOMISER COIL
28

Water Wall System
O The water walls are tube panels through which the
water for steam generation will be circulated. In Water
Wall only heat is added to evaporate the feed water to
steam.
O It also forms the major part of furnace enclosure.
TECHNICAL DATA
Design Temp & Pr. at WW Inlet
Hdr
3680
C & 212 kg/cm2(g)
Design Temp & Pr. at WW Outlet
Hdr
3680
C & 209 kg/cm2(g)
Total Heating Surface of WW Tubes 7000 Sq.Mtr
Water Holding Capacity of
Circulating System
170 m3
29

Description Size
(DiaXThck)
(In mm)
Design Temp( 0
C) Design Pressure
(kg/cm2(g))
Down Comer 368X36 368 212
Bottom Ring
Header
914X85 368 212
WW Tubes 51X5.6/6.0/7.1
63.5X7.1
396 214
Front, Hanger Tube &
Screen Tube O/L
Header
273X40 368 209
Side WW O/L
Header
273X50 368 209
Riser Pipes 159X18 368 209
30

WW
Panel
s
Div
SH
Pane
l
Platen
SH
31

CC PUMP
Boiler water circulating pump is used in
high capacity boiler (Super critical or Sub
critical), It assists the circulation of water, to
overcome the friction losses in Boiler.
Make : Torishima
Type : Single Suction-Double
discharge
No of Pumps : Three
Design pressure : 210 kg/cm2(g)
Hydr0 test pressure : 315 kg/cm2(g)
Design Temperature : 366 o
C
Motor Rating : 350 KW
Full Load Speed : 1450 rpm
Suction Pressure : 197kg/cm2(g)
Quantity Pumped : 48453 l/min(2850 tph)
Wt. of Motor : 7300 kg
Wt. of Pump casing : 5200 kg
32

Superheated Steam Circuit
LTSH
I/L Hdr
LTSH
Coil
SH DESH
Link
Div SH
I/L Hdr
LTSH
O/L Hdr
SH Div
Panelette
Assy
Div SH
O/L Hdr
SH Div
Panel O/L
Links
SH Vertical
Platen I/L
Hdr
SH Vertical
Platen Assy
SH Platen
O/L Hdr
MS Line
HP
Turbine
MS Line 36

Super Heater System
O Superheater is a component of a boiler that superheats steam i.e.
heats steam above its saturation temperature. Superheated steam
contains more thermal energy and increases the overall efficiency
of the cycle.
O There are 3 stages of Super Heaters – LTSH, Divisional Panelette SH
& Platen Super Heater.
TECHNICAL DATA
No of Sets LTSH-62 Sets, Divisional SH- 24 Sets,
Platen SH – 25 Sets
Total Heating Surface LTSH -10,100 m2
, Div SH -2025 m2
,
Platen SH – 2200 m2
Total Water Holding Capacity of SH
system
130 m3
37

Superheater System
Description Size
(DiaXThick)
(In mm)
Design Temp( 0
C) Design Pressure
(kg/cm2(g))
LTSH I/L Hdr 323.9X50 395 205.8
LTSH Horizontal
Assy.
47.63X5.6 445 205.8
LTSH Terminal Tube
Assy
47.63X5.6 464 205.8
LTSH O/L Hdr 457.2x65 435 204.2
SH DESH Link 508x60
558x60
440
426
204.0
SH Div I/L Hdr 406.4X60 419 202.8
Contd.. 38

Description Size
(DiaXThick)
(In mm)
Design Temp( 0
C) Design Pressure
(kg/cm2(g))
SH Div. Panelette
Assy
44.5X5
44.5X7.1
483/
522
202.8
Div. SH O/L Hdr 406.4X70 487 198.9
SH Div Panel O/L
Link
508X60 487 198.6
SH Vertical Platen
I/L Hdr
406.4X60 487 197.4
SH Vertical Platen
Assy
63.5X6.3/12
51X6.3/11
476/533
476/551
197.4
SH Platen O/L Hdr 508X110 540 192.2
39

LTSH COIL

Div SH Panel

Reheater Circuit
RH I/L
Hdr
RH Coil
Assy
RH O/L Hdr (R)
From
HP
Turbin
e
Exhaus
t
CRH
Line
HRH
Line
IP
Turbine
RH O/L Hdr (F)
43

Reheater System
O Reheater is a boiler component in which heat is added
to intermediate-pressure steam, which has lost some of
its energy in expansion through the high-pressure
turbine.
O Reheater System comprises of : RH Inlet Header, RH
Front Platen Coil Assy, RH Rear Spaced Assy, RH Outlet
Header
TECHNICAL DATA
No of RH Coil Assy 74 Sets (Both Front & Rear)
Total Heating Surface of RH Coils 7628 Sq. Mtr
Total Water Holding Capacity of RH 105 m3
Design Temp. & Pr. at RH Inlet Hdr 361 0
C ,52.4 kg/cm2(g)
Design Temp. & Pr. at RH Outlet Hdr 540 0
C,52.4 kg/cm2(g)
Size of RH front Coil Assy 63.5 mm Dia X 4 mm Thck
54 mm Dia X 4.5 mm Thck
Size of RH Rear Coil Assy 54 mm Dia X 4.5 mm Thck
44

RH Coil Assy

WATER
SATURATED STEAM
SUPER HEATED STEAM
REHEATED STEAM
M.S
H.
R.
H
C.R.H
FROM F.C.S
CC
Pump
Div SH
Platen
SH
RH
Coil
Assy
ECO Coil
Boiler
Drum
DC
Bottom Ring Header
Furnace Wall
LTSH

Air Flow path
PA Fan FD Fan FD Fan PA Fan
Pri.
Sid
e
Sec
Side
APH
SCAPH SCAPH
Wind Box
Hot PA
to Mill
Hot PA
to Mill
Cold
PA
to
Mill
Cold
PA
to
Mill
Scanne
r Air
fan
Flue
Gas
Sec.
Sid
e
Pri.
Side
Flue
Gas
APH
47

Forced Draught Fan
• These fans supply air necessary for fuel combustion for
proper burning of the specific fuel. These are generally axial
type.
• The FD fans supply secondary & over fire air, which is
preheated in secondary sector APH.
• Over fire air can be admitted to the furnace through the
upper levels of furnace wind box nozzle to assist in
reducing the amount of NOx formed in furnace.
• Control of airflow to WB is effected by FD fan blade pitch
control & distribution of secondary air to WB compartments
is controlled by secondary air damper.
• Steam Coil Air Pre Heater(SCAPH) are provided in the by
pass ducts before each APH to prevent corrosion of cold end
of APH normally at start up & low load operation.
48

Forced Draught Fan
Blades
Suction
Chamber
Diffuser
49

 These fans supply the air needed to dry & transport coal from coal
mills to the furnace. These fans are generally axial type of fan.
• To achieve the required temperature at mill inlets(For Proper
Drying of Coal) , part of air(Tempering air) by passes the APH & is
mixed with hot air coming out of APH.
 The PA Fan blade pitch is modulated to maintain a pre determined
pressure in pulveriser hot air bus duct.
 Mill Air flow is maintained by adjusting the hot air regulating
damper while the mill outlet temp is maintained by adjusting the
cold air regulator damper. Venturi is provided in the mill inlet
duct to measure the individual mill air flow.
Primary air fan
51

Primary Air Fan
Suction
Chamber
Diffuser Assy.
52

1st
Stage
Blade
2nd
Stage
Blade
Primary Air Fan
53

Technical specification of Fans
Description Unit PA Fan FD Fan
Make N.A. BHEL BHEL
Type N.A. PAF 19/10.6-2 FAF 23/12.5-1
Motor Rating KW 3600 1200
Capacity M3
/Hr 105 215
Speed rpm 1490 990
Pressure mmwc 1290 410
Temp of Medium
Handled
0
C 50 50
Bearing
Lubrication
N.A. Oil
Lubrication(ISO
VG68)
Oil
Lubrication(ISO
VG68)
54

Air Pre Heater
 The purpose of APH is to recover heat from the
boiler flue gas & heat air before another process
and so as to increase the thermal efficiency.
Ljungstrom (Regenerative) Air Pre Heater:
 The basic component of Ljungstrom APH is a
continuously rotating cylinder, called rotor, that is
packed with thousands of square feet of specially
formed sheets of heat transfer surface.
 As the Rotor revolves, waste heat is absorbed from
the hot flue gas passing through one half of the
structure. The heat transfer cycle is continuous as the
surface are alternatively exposed to the outgoing gas
& incoming air stream.
55

Technical Data
Description Value
Type Regenerative, Trisector
No per Boiler Two
Rotor Diameter 6789 mm
Arrangement Vertical
Heating Surface Area 84200 M2
Main Drive 18.5 KW,1500 rpm
Aux. Drive Air Motor with gear box & muffler, Air
consumption 8 Nm3
/min at pressure 6.33
kg/cm2(g)
57

Soot blowers
 As the flue gas moves over the heat transfer
areas of boiler, the ash deposits on the heating
surfaces. This is known as soot deposit. Soot
Blowers are installed to blow away these soot
deposits to facilitate smooth heat transfer.
 There are two types of Soot Blowers-Wall
Blowers & Long Retractable Soot Blowers.
 Wall Blowers are used to blow off soots deposited
in water walls in furnace
 LRSB are used in Super Heaters, Economiser &
Reheater Zone.
58

LRSB
59
WALL
BLOWER

60
WALL BLOWER

Technical Data
Description Unit Wall Blower LRSB
No per Boiler No. 88+16(Future) 40+18(Future)
Travel mm 305 9700
Blowing Pressure kg/cm2(g) 11 12.5/10.5
Blowing Steam Temp 0
C 383 383
Speed of Travel mpm 6.1 1.55
Speed of Rotary rpm 0.7 5.87
Blowing Rate per group Kg/min 89 152/93/79
Blowing time per group Min 1.4 12.04
Operating time per cycle Min 66 75.12/325.52/100.16
Steam Consumption per cycle Kg 5500 47708
Steam Consumption
/Cycle/Blower
Kg 62.5 1192
Total Steam Consumption per Day Kg 159624
Blowing Steam Temp & Pr. 383 0
C & 30 kg/cm2
Cycles per Day No 3 3 61

LDO & HFO Circuit
Tanker 1
12KL
Tanker 2
12KL
Tanker 3
12KL
Tanker 4
12KL
Tanker 5
12KL
Tanker 6
12KL
HFO
Tank #1
3000 m3
HFO
Tank #2
3000 m3
LDO
Tank#1
1000
m3
LDO
Tank#2
1000
m3
LDO
Pumps
HFO
Pumps
Unloadin
g Pump
House
LDO Unloading Header
HFO Unloading Header
LDO Discharge Line
HFO Discharge Line
Steam Line to Tanks
Contd.
.
PRS
14 kg/cm2(g)
250 0
C
4.5 kg/cm2(g)
232 0
C
Condensate Line to Flash Tank
62
LDO
cap.-50m3
/hr &
Pr.- 2 Kg/cm2
HFO
cap.-50m3
/hr &
Pr.- 5 Kg/cm2

LDO & HFO Circuit
LDO
Tank
HFO
Tank
LDO Pump
Set(Both
Units)
HFO
Pump
Set(Unit I)
HFO
Pump
Set(Unit
II)
HFO
Heater-1
HFO
Heater-2
HFO
Drain
System
Boiler I
Boiler
II
Condensate Line to
Nearest Trench
Aux.
Steam
2X1000 m3
2X3000 m3
14
kg/cm2(g)
210 0
C
2x100 %
1x100 %
63
Forwarding Pump House
Steam
Tracin
g Line
Steam
Tracin
g Line

Technical specification of hfo & Ldo
Description Unit LDO HFO
Standard N.A. IS 1460-1974 IS-1593/1971/Gr HV/Oil
Flash Point 0
C 66 66
Pumping Temp. 0
C 35 55
Firing Temp. 0
C 35 120
Viscosity cst 2 to 20 @Firing
Temp.
180 at 55 0
C
Total Sulphur N.A. 1.8 % by weight 4.5 % by weight
GCV Kcal/kg 10720 10270
Sp. Gravity at 15
0
C
N.A. 0.85-0.87 0.85-0.95
64

Technical specification of HFO & LDO Forwarding Pumps
Description Unit LDO Pump HFO Pump
Make N.A. Alekton Alekton
No of Pump per Blr No 01(Common for
Both Unit)
01
Model No. N.A. DH 330-770-3 DH 600-1400-3
SJ
Capacity at max cst lpm 281(14.3 tph) 879(50.1 tph)
Speed rpm 2920 1450
Suction Pressure kg/cm2(g) -0.5 -0.5
Delivery Pressure kg/cm2(g) 25 30
Motor rating KW 18.5 75
Motor Make N.A. Crompton Greaves Crompton Greaves
Bearing Lubrication N.A. Grease IS 719
Gr.3
Grease IS 719
Gr.3 65

TT burners assy.
COAL
OIL+AIR
COAL
AIR
COAL
OIL+AIR
COAL
AIR
COAL
OIL+AIR
COAL
AIR
COAL
OIL+AIR
COAL
END
AIR
END
AIR
AA
A
AB
B
BC
C
CD
D
DE
E
EF
F
FG
G
GH
H
HH
OVER FIRE AIR
LOWER
OVER FIRE AIR
UPPER HFO OIL BURNERS
Service Ignition of Pulverised Fuel, Stabilization of
Coal Flame at lower loads etc.
Capacity Maximum 30 % MCR
No of Oil Guns 16(4 per elevation)
Locations Aux air nozzles AB,CD,EF & GH
HFO flow per Gun 2420 kg/hr(Max), 950 kg/hr(Min)
HFO Pressure 10.5 kg/cm2(g)(Max), 4.0 kg/cm2(g)(Min)
Atm. Steam Flow/Gun 250 kg/Hr
At. Steam Pr. 5.25 kg/cm2(g)
LDO OIL BURNERS
Service Initial startup & warm-up.
Capacity Maximum 7.5 % MCR
No of Oil Guns 4(In One Elevation)
Locations Aux air nozzle AB
LDO flow per Gun 2420 kg/hr(Max), 950 kg/hr(Min)
LDO Pressure 10.0 kg/cm2(g)(Max), 3.5 kg/cm2(g)(Min)
Atm. air Flow/Gun 241 kg/ Hr
At. air Pr. 5.25 kg/cm2(g)
66

Coal Circuit
Coal
Bunker
Pulveriser
To
four
corner
s of
Boiler
Coal
From
CHP
Feeder
67

Combustio
n Chamber Div SH
Platen
SH
RH
Coil
LTSH
Coil
Economiser
APH
APH
ESP
Pass A
ESP
Pass B
ESP
Pass C
ESP
Pass D
ID
Fan
ID
Fan
C
H
I
M
N
E
Y
Flue gas path
1404
0
C
1150
0
C
1040
0
C
904 0
C 7100
C
541 0
C
1270
C
3340
C
3340
C
127 0
C
68

APH
C
H
I
M
N
E
Y
Flue Gas Path
ESP
-5 mmwc
-19 mmwc
-33 mmwc
-79
mmwc
-213
mmwc
-270
mmwc
+32
mmwc
69

• Electrostatic Precipitator : An electrostatic
precipitator (ESP) is a highly efficient filtration
device that removes fine particles, like dust and
smoke, from a flowing gas using the force of an
induced electrostatic charge minimally impeding
the flow of gases through the unit.
No of pass per boiler : 4
Gas flow at inlet : 566.7 Nm3
/s
Temp. at inlet : 127 0
C
Dust concentration at inlet : 86.8 gm/Nm3
(Worst
Coal), 70.69 gm/Nm3
(Design Coal)
Dust concentration at outlet : 50 mg/Nm3
(Worst Coal)
Efficiency : 99.942 %
70

 Induced Draught Fan : ID Fans evacuate combustion
products from the boiler furnace by creating
sufficient negative pressure to establish a slight
suction in furnace.
Make : BHEL
No per Boiler : Two
Model No. - NDZV 47 SIDOR
Fan Regulation : Inlet damper & VFD
Temp. of Medium : 150 0
C
Motor Rating : 3800 KW
Flow : 565 m3
/Hr
Draught at Inlet : -270 mmwc
Draught at Outlet : 32 mmwc
Bearing Lubrication : Oil Lubrication(ISO VG68)
71

Suction
Chambe
r
Discharge
Chamber
Impelle
r
Motor
Rear
Side
Bearing
Front
Side
Bearing
INDUCED DRAUGHT FAN
72

Thanks
73

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