Transcript Slide 1

Devdeep Bose
DGM ( Commng & Testing)
• INTRODUCTION TO SUPER CRITICAL
UNI -
POINTS OF DISCUSSION

SUB CRITICAL & SUPER CRITICAL BOILER

SIPAT BOILER DESIGN

SIPAT TURBINE DESIGN

DESIGN PARAMETERS

COMMISSIONING
 PRE COMMISSIONING PROBLEMS
 POST COMMISSIONING PROBLEM
COMPARISION OF 660 MW Vs 500 MW BOILER
Description
unit
660
T/HR
2225
1625
KG/CM2
256
179
0C
540
540
T/HR
1742
1397.4
0C
303.7
338.5
RH STEAM TEMP OUTLET
0C
568
540
RH STEAM PRESS INLET
KG/CM2
51.17
46.1
FEED WATER TEMP
0C
291.4
255.2
S/H STEAM FLOW
SH
STEAM PR
SH STEAM TEMP
RH STEAM FLOW
RH STEAM TEMP
INLET
500
Tonnage Comparison
Description
660 MW
500 MW
Structural Steel Erection
7383
9200
Boiler Proper & Accessories (Pre. Parts)
7080
5300
Refractory, Insulation & Cladding
1410
2000
Power Cycle Piping
3032
2200
54
76
Coal Firing System
3573
2000
Draft System
5275
5200
62
200
Miscellaneous System
130
280
Electrical & Instrumentation
282
380
28281
26836
Soot Blowing System
Fuel oil system
TOTAL
Material Comparison
Description
660 MW
500 MW
Structural Steel
Alloy Steel
Carbon Steel
Water wall
T22
Carbon Steel
SH Coil
T23, T91
T11, T22
RH Coil
T91,Super 304 H
T22, T91,T11
LTSH
T12
T11
Economizer
SA106-C
Carbon Steel
Welding Joints (Pressure Parts)
42,000 Nos
24,000 Nos
Structural Comparison
Slno
660 MW
1
STRUCTURALS
500 MW
a
b.
Remarks
Entire structural is bolting typeentire structure is bolted. Holes
are drilled on the columns and
gusset plates, and supplied with
matching plates.
Structural is
assembled at site
with welding
Advantages (660MW) of
Bolting structure:
oFast in erection.
oClean environment
oNo Welding network required
oSafety at site
oPainting finish is good
o( No Weld surface)
No Welding work involved in
assembly/ Erection , except
Walkway rail post welding
Assembly is carried
out with Welding
Can be dismantled if required
( For Maintenance purpose)
Material supply is tier wise
including staircases, railing,
gratings etc.
Material is supplied
as per the erection
sequence.
Erection completion tier wise,
including gratings, platforms ,
staircases etc.
c
COST COMPARISON
1 Cost of SG Package
1970.73 Cr
1020.54 Cr with ESP
2 Cost of ESP
183.54Cr
3 Total cost of Boiler + ESP
2154.27 Cr
1020.54 Cr
4 Cost of Boiler per MW with ESP
1.09 Cr
1.02 Cr
5 Cost of TG for entire stage
1204.72 Cr
634.31 Cr
6 TG cost per MW
0.6Cr
0.63 Cr
BOILER SPECIFICATION
Description
unit
S/H STEAM FLOW
T/HR
2225
KG/CM2
256
0C
540
T/HR
1742
0C
303.7
RH STEAM TEMP OUTLET
0C
568
RH STEAM PRESS INLET
KG/CM2
51.17
FEED WATER TEMP
0C
291.4
SH
STEAM PR
SH STEAM TEMP
RH STEAM FLOW
RH STEAM TEMP
INLET
= Boiler Efficiency
Quoted Turbine Heat Rate
100% TMCR
86.27%
100% Load 1904 Kcal / KWH
80% TMCR
86.60%
80% Load
1924 Kcal / KWH
60% TMCR
86.68%
60% Load
1973 Kcal / KWH
50% TMCR
86.91%
50% Load
2065 Kcal / KWH
Net Plant Heat Rate = NTRH
= 2207 KCal / KWHR ( at 100% TMCR)
80% TMCR
60% TMCR
50% TMCR
= 2222 Kcal / KWHR
= 2276 Kcal / KWHR
= 2376 Kcal / KWHR
Plant Efficiency at 100% TMCR = 38.96%
80% TMCR = 38.7 %
60% TMCR = 37.78%
50% TMCR = 36.19%

Supplier
: M/s DOOSAN

Erection By
: M/s L&T
UNDERSTANDING SUPER CRITICAL TECHNOLOGY

When Water is heated at constant pressure above the critical pressure, its
temperature will never be constant

No distinction between the Liquid and Gas, the mass density of the two
phases remain same

No Stage where the water exist as two phases and require separation : No
Drum

The actual location of the transition from liquid to steam in a once through
super critical boiler is free to move with different condition : Sliding Pressure
Operation

For changing boiler loads and pressure, the process is able to optimize the
amount of liquid and gas regions for effective heat transfer.
SUPER CRITICAL
BOILER CYCLE WITH SH, RH & Regeneration
1 3
568’C
540’C
TEMP
600
500
Steam flow
:2225 T/Hr
Steam temp
: 540 ‘c
Steam Pres
: 256 kg/cm2
RH pre
: 51.6 Kg/cm2
RH Temp
: 568’c
Feed water Temp
: 291’c
2
400
300
200
100
5
4
0
ENTROPY
540°C, 255 Ksc
568°C, 47
Ksc
492°C, 260 Ksc
457°C, 49 Ksc
FUR ROOF
I/L HDR
ECO HGR
O/L HDR
HRH LINE
MS LINE
411°C,
277Ksc
411°C,
275 Ksc
SEPARATOR
G
LPT
C
O
N
D
E
N
S
E
R
LPT
FINAL SH
FINAL
RH
DIV PANELS SH
LTRH
PLATEN
SH
VERTICAL WW
ECO
JUNCTION
HDR
305°C, 49 Ksc
S
T
O
R
A
G
E
T
A
N
K
IPT
HPT
ECONOMISER
ECO I/L
FEED WATER
BWRP
290°C, 302 KSC
FUR LOWER HDR
FRS
Steam
Partial Steam Generation
Steam
Complete or Once-through
Generation
Water
Heat Input
Heat Input
Water
Water
Boiling process in Tubular Geometries
SIPAT SUPER CRITICAL BOILER

BOILER DESIGN PARAMETER

DRUM LESS BOILER : START-UP SYSTEM

TYPE OF TUBE
 Vertical
 Spiral

SPIRAL WATER WALL TUBING
 Advantage
 Disadvantage over Vertical water wall
Vertical Tube Furnace
 To provide sufficient flow per tube, constant pressure furnaces
employ vertically oriented tubes.
 Tubes are appropriately sized and arranged in multiple passes in
the lower furnace where the burners are located and the heat input
is high.
 By passing the flow twice through the lower furnace periphery
(two passes), the mass flow per tube can be kept high enough to
ensure sufficient cooling.
 In addition, the fluid is mixed between passes to reduce the upset
fluid temperature.
Spiral Tube Furnace
 The spiral design, on the other hand, utilizes fewer tubes to obtain
the desired flow per tube by wrapping them around the furnace to
create the enclosure.
 This also has the benefit of passing all tubes through all heat
zones to maintain a nearly even fluid temperature at the outlet of
the lower portion of the furnace.
 Because the tubes are “wrapped” around the furnace to form the
enclosure, fabrication and erection are considerably more
complicated and costly.
SPIRAL WATER WALL
ADVANTAGE
 Benefits from averaging of heat absorption variation : Less tube leakages
 Simplified inlet header arrangement
 Use of smooth bore tubing
 No individual tube orifice
 Reduced Number of evaporator wall tubes & Ensures minimum water flow
 Minimizes Peak Tube Metal Temperature
 Minimizes Tube to Tube Metal Temperature difference
DISADVANTAGE
 Complex wind-box opening
 Complex water wall support system
 tube leakage identification : a tough task
 More the water wall pressure drop : increases Boiler Feed Pump Power
 Adherence of Ash on the shelf of tube fin
BOILER OPERATING PARAMETER
FD FAN
2 No’S ( AXIAL )
11 kv / 1950 KW
228 mmwc
1732 T / Hr
PA FAN
2 No’s ( AXIAL)
11 KV / 3920 KW
884 mmwc
947 T / Hr
ID FAN
2 No’s ( AXIAL)
11 KV / 5820 KW
TOTAL AIR
2535 T / Hr
SH OUT LET PRESSURE / TEMPERATURE /
FLOW
256 Ksc / 540 C
2225 T / Hr
RH OUTLET PRESSURE/ TEMPERATURE /
FLOW
46 Ksc / 568 C
1742 T / Hr
SEPARATOR OUT LET PRESSURE/
TEMPERATURE
277 Ksc / 412 C
ECONOMISER INLET
304 Ksc / 270 C
MILL OPERATION
7 / 10
COAL REQUIREMENT
471 T / Hr
SH / RH SPRAY
89 / 0.0 T / Hr
BOILER EFFICIENCY
87 %
3020 T / Hr
Coal Analysis
Unit
Design
Coal
Worst
Coal
Best
Coal
Young Hung
#1,2(800MW)
Tangjin
#5,6(500MW)
kcal/kg
3,300
3,000
3,750
6,020
6,080
Total Moisture
%
12.0
15.0
11.0
10.0
10.0
Proximate Volatile Matter
Analysis Fixed Carbon
%
21.0
20.0
24.0
23.20
26.53
%
24.0
20.0
29.0
52.89
49.26
%
43.0
45.0
36.0
13.92
14.21
Fuel Ratio (FC/VM)
-
1.14
1.00
1.21
2.28
1.86
Combustibility Index
-
2,067
2,353
2,476
2,781
3,492
Carbon
%
39.53
31.35
40.24
63.03
62.15
Hydrogen
%
2.43
2.30
2.68
3.60
3.87
Nitrogen
%
0.69
0.60
0.83
1.53
1.29
Oxygen
%
6.64
5.35
8.65
7.20
7.80
Sulfur
%
0.45
0.40
0.60
0.72
0.68
Ash
%
43.00
45.00
36.00
13.92
14.21
Moisture
%
12.00
15.00
11.00
10.00
10.00
HGI
50
47
52
45
48
-
Hi–Vol. ‘C’
Bituminous
Hi–Vol. ‘C’
Bituminous
Hi–Vol. ‘C’
Bituminous
Midium Vol.
Bituminous
Hi–Vol. ‘C’
Bituminous
Parameter
High Heating Value
Ash
Ultimate
Analysis
Grindability
ASTM Coal Classification
1.
High erosion
potential for
pulverizer and
backpass tube is
expected due to
high ash content.
2. Combustibility
Index is relatively
low but
combustion
characteristic is
good owing to
high volatile
content.
Ash Analysis
Unit
Design
Coal
Worst
Coal
Best
Coal
SiO2
%
61.85
62.40
61.20
57.40
57.40
Al2O3
%
27.36
27.31
27.32
29.20
29.20
Fe2O3
%
5.18
4.96
5.40
4.40
4.40
CaO
%
1.47
1.42
1.52
2.70
2.70
MgO
%
1.00
1.03
0.97
0.90
0.90
Na2O
%
0.08
0.08
0.08
0.30
0.30
K2O
%
0.63
0.32
1.22
0.70
0.70
TiO2
%
1.84
1.88
1.80
1.30
1.30
P2O5
%
0.54
0.55
0.44
-
-
SO3
%
0.05
0.05
0.05
-
-
Others
%
-
-
-
3.10
3.10
Initial Deformation
o
C
1150
1100
1250
1200
1200
Softening
o
C
-
-
-
Hemispheric
o
C
1400
1280
1400
Flow
o
C
1400
1280
1400
Ash Content
kg/Gcal
130.3
150.0
96.0
23.12
23.37
Basic / Acid
B/A
0.09
0.09
0.10
1.63
1.63
Parameter
Ash
Analysis
Ash Fusion
Temp. (oC)
(Reducing
Atmos.)
Young Hung
Tangjin
#1,2(800MW) #5,6(500MW)
1.
Lower
slagging
potential is
expected due
to low ash
fusion temp.
and low basic
/ acid ratio.
2. Lower fouling
potential is
expected due
to low Na2O
and CaO
content.
BOILER LOAD CONDITION
Constant Pressure Control

Above 90% TMCR The MS Pressure remains constant at rated pressure

The Load is controlled by throttling the steam flow

Below 30% TMCR the MS Pressure remains constant at minimum
Pressure
Sliding Pressure Control
 Boiler Operate at Sliding pressure between 30% and 90% TMCR
 The Steam Pressure And Flow rate is controlled by the load directly
CONSTANT PRESSURE Vs VARIABLE PRESSURE BOILER CHARACTERSTIC
Boiler Load %
20
40
Efficiency Change %
+1
0
-1
-2
-3
-4
Variable Pressure
60
80
100
Benefits Of Sliding Pressure Operation ( S.P.O)

Able to maintain constant first stage turbine temperature

Reducing the thermal stresses on the component : Low Maintenance & Higher
Availability

No additional pressure loss between boiler and turbine.

low Boiler Pr. at low loads.
WHY NOT S.P.O. IN NATURAL/CONTROL CIRCULATION BOILERS
 Circulation Problem : instabilities in circulation system due to steam formation in
down comers.
 Drum Level Control : water surface in drum disturbed.
 Drum : (most critical thick walled component) under highest thermal stresses

LMZ (LENINGRADSKY METALLICHESKY ZAVOD)
 K STANDS FOR KLAPAN LTD.,BULGARIA WHICH SUPPLIES
TURBINE,NOZZLES,DIAPHRAGMS, SEALS,BLADES ETC.
1.TG DECK IS VIS SUPPORTED AND HAS 26 CONCRETE COLUMNS
(T1 – T26).
2.TG HALL IS CONSTITUTED OF 3 MAINS ROWS OF COLUMNS – A,B ,C
ROW AND TWO BAYS – AB BAY AND BC BAY. THE WIDTH OF AB BAY IS
36m AND BC BAY IS 12m
3.CONDENSER TUBE BANKS (CW PATH) HAS AN INCLINATION OF 40.
4.THERE ARE TWO MAIN EOT CRANES FOR TG HALL.EACH EOT
CRANE IS HAVING A CAPACITY OF 200t FOR MAIN HOIST AND 20t FOR
AUXILIARY HOIST. 35.5m IS THE MAXIMUM VERTCAL DISTANCE A
HOIST CAN TRAVEL.TANDEM OPERATION OF TWO EOT CRANES ARE
ALLOWED.
IP Turbine
LP Turbine
Ext.
No
Source Of Extraction
Destination Equipments
1
13th stage of HPT
HPH-8
2
CRH
HPH-7
3
3rd stage of IPT
HPH-6 *
3
3rd stage of IPT
TDBFP
4
6th stage of IPT
DEAERATOR
5
8th stage of IPT
LPH-4
6
11th stage of IPT
LPH-3
7
2nd stage of LPT
LPH-2
8
4th stage of LPT
LPH-1
Condenser
•
•
•
Design
Design CW Flow
Vacuum
•
•
No. of passes
Total no. of tubes
•
•
•
Tube material
Rated TTD
DT of CW
LMZ
64000 m3/hr
77 mm Hg (abs) at 33 0C
89 mm Hg (abs) at 36 0C
1
22.225 (OD)x0.71 (t) - 29920
22.225 (OD)x1.00 (t) - 2080
ASTM A-249 TP 304
3.40C
100C
Condensate Extraction Pump
•
•
•
•
•
•
•
•
Design flow rate
Discharge pressure
Shut off head
Pump speed
Power input
No. of stages
Type of first stage impeller
Depth
238.75 Kg/s
32.15 Ksc
395
m
1480 rpm
972.3 KW
6
double entry
7.43 m
MDBFP
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
Pump flow
Suction temp
BP Suction pr.
BFP Suction pr. 21.01
BFP Discharge pr.
BFP Discharge temp.
BP Discharge pr.
Shut off head
BFP Speed
BP Speed
Normal R/C flow220
HC Rated O/P Speed
Outer casing type
No. of stages
BFP warm up flow
769.950
186.2
14.05
ata
335.78
187.9
22.01
4830
6275
1490
TPH
6505
barrel
7
15
TPH
0C
ata
ata
0C
ata
m
rpm
rpm
rpm
TPH
TDBFP
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
Pump flow
Suction temp
BP Suction pr.
BFP Suction pr.
BFP Discharge pr.
BFP Discharge temp.
BP Discharge pr.
Shut off head
BFP Speed
BP Speed
Normal R/C flow
HC Rated O/P Speed
Outer casing type
No. of stages
BFP warm up flow
1283.14
186.2
14.10
28.24
335.83
187.8
29.06
4580
4678
2098
365
6505
barrel
7
20
TPH
0C
ata
ata
ata
0C
ata
m
rpm
rpm
TPH
rpm
TPH
Drip Pump
•
•
•
•
•
•
•
•
Design flow rate
Discharge pressure
Shut off head
Pump speed
Power input
No. of stages
Type of first stage impeller
Depth
324.509 TPH
43
ata
306.7
m
1486
rpm
310.1
KW
5
centrifugal, single entry
1090
mm
RATED CONDITIONS
•
•
LOAD
BEFORE HP STOP VALVE
•
•
•
•
660MW
:
:
:
247KSC
5370C
2023.75T/HR
:
:
48KSC
298.710C
:
:
43.2KSC
5650C
1681.12T/HR.
0.105KSC (abs.)
64000M3/HR
286.350C
47.5 – 51.5 Hz
AFTER HPC
•
•
•
STEAM PRESSURE
STEAM TEMPERATURE
STEAM FLOW
:
STEAM PRESSURE
STEAM PRESSURE
BEFORE IP STOP VALVE
•
•
STEAM PRESSURE
STEAM TEMPERATURE
•
•
•
STEAM FLOW TO REHEATER
DESIGN CONDENSER PRESSURE
COOLING WATER FLOW
:
:
:
•
FINAL FEED WATER TEMP.
:
•
FREQUENCY RANGE
:
STEAM TURBINE
•
•
•
•
•
•
Generator rated speed
Generator manufacturer
No. of bleedings
Length of the turbine
No. of stages
 HPT
 IPT
 LPT-1
 LPT-2
 Total
Turbine Governing system
 Mode of Governing
 Type
 Control fluid





Normal Operating Pr.
Capacity
Fluid pump motor rating
Filter material
Mesh size
3000
Electrosila
8
36.362
rpm
m
17
11x2
5x2
5x2
59
Nozzle
E/H
Firequel-L make
Supresta-USA
50 Ksc
600 lpm
200 KW
Ultipor
25 µ
Turbine Protections
Turbine protection system consists of Two Independent channels,
each operating the corresponding solenoid (220V DC) to trip the
Turbine in case of actuation of remote protection
Hydraulic Protection: Apart from the Electrical Trip, Turbine is
equipped with the following Hydraulic Protections:
1. Local Manual Trip (1V2)
2. Over speed Trip #1 at 110% of rated speed
3. Over speed Trip #2 at 111% of rated speed
4. Governing oil pressure < 20 Ksc
Contd..
5.Axial shift Very High (2V3) [-1.7mm, +1.2mm]
6.Turbine bearing vibration : Very High (2V10 including X & Y
directions)* >11.2mm/sec (Td=2 sec)
7.Lube oil tank level very Low (2V3)* Td=3sec (Arming with two
stop valves open)
8.Lub oil pressure Very Low (2V3) < 0.3 Ksc; Td =3 sec (Arming
with two stop valves open)
9.Condenser pressure Very High (2V3) > - 0.7ksc
(Arming with condenser press < 0.15 ksc Abs)
Contd
10.M.S. temp Very Low (2V3) < 470 deg C (arming > 512 deg
C)*
11.M.S. temp Very High (2V3) > 565 deg C*
12.HRH temp Very Low (2V3) < 500deg C (arming > 535 deg
C)*
13.HRH temp Very High (2V3) > 593deg C*
14.HPT outlet temperature Very High (2V4) > 420 deg C
Contd…
15.Gen seal oil level of any seal oil tank Very Low (2V3)* < 0
mm;Td=15 sec (Arming with any two stop valves open)
16.All Generator seal oil pumps OFF (3V3)* Td: 9 sec (Arming
with any two stop valves open)
17.Generator Stator winding flow Very Low (2v3) < 17.3 m3/hr; Td
=120 sec (Arming with any two stop valves open)
18.Generator hot gas coolers flow Very LOW (2V3)* : <180m3/hr;
Td=300sec(Arming with any two stop valves open)
19.Generator cooler hot gas temp. Very High(2V4) > 85 deg (Td =
300sec
Contd
20.MFT operated: (2V3)
21.Deareator level Very High (2V3) > 3400 mm*
22.HP heater level protection operated (2V3)*
23.Generator Electrical protection operated (2V3)
25.Turbine over speed protection operated (114%)
26.Turbine Controller failure protection operated (2V3)
OF SIPAT SUPER CRITICAL UNIT
1ST UNIT SYNCHRONIZED AT
1ST UNIT FULL LOAD ACHIEVED AT
: 18.02.2011
:
2nd UNIT SYNCHRONIZED AT
2ND UNIT FULL LOAD ACHIEVED AT
: 03.12.2012
: 24.12.2012
PRE – COMMISSIONING ACTIVITIES

CHEMICAL CLEANING OF BOILER :
REQUIRED FOR
Maintaining steam quality at the turbine inlet.
Minimizing corrosion of the metal surface of boiler.

DETERGENT FLUSHING OF PRE-BOILER SYSTEM
To remove dirt ,oil ,grease etc., from Condensate ,Feed water, Drip and Extraction steam lines of HP and LP
heaters prior to putting these systems in regular service. This is to ensure flow of clean condensate and feed
water to the boiler.

STEAM BLOWING OF POWER CYCLE PIPING :
The purpose of steam line blowing is to remove pipe slag, weld bead deposits and other foreign material from
the main and reheat steam systems prior to turbine operation. The cleaning is accomplished by subjecting the
piping systems to heating, blowing steam and cooling cycles in sufficient number and duration until clean steam is
obtained.

SAFETY VALVE FLOATING
PRE – COMMISSIONING CHECKS

All commissioning procedure should be finalized.

P&I Drawings should be finalized and available with site engineer

Different systems check list should be finalized with all concerned agencies

All Field quality checks should be completed.

P&I Checks should be finalized.

Start – Up procedure should be finalized
COMMISSIONING SEQUENCE OF TG SIDE
1.Commissioning of stator water cooling system for HV testing
before generator rotor insertion.
a) Stator water pump trial run.
b) Flushing of the system bypassing winding.
c) Flushing of the system through the winding.
2.Commissioning of MCW,ACW and DMCW system.
a) Trial run of pumps.
b) Flushing of the system.
3.Detergent Flushing of pre boiler system (Feed water ,condensate
,HPH and LPH drip system)
a) Cold water flushing until turbidity comes below 5NTU.
b) Hot water flushing (600C) with 2 hrs circulation of each circuit.
c) Raising water temperature to 600C and addition of Detergent
d) (Coronil 100%)
e) Circulation through each circuit for 2 hrs.
f) Hot draining of the system
g) DM water rinsing of each circuit until conductivity comes below
5µs/cm and oil content BDL.
h) Passivation with ammonia and hydrogen peroxide solution at a
temperature of 400C.
i) Draining of the system.
4. Lube oil flushing of MDBFP lube oil system.
5.Trial run of MDBFP.
6.Lube oil and seal oil flushing of main TG.
7.CF system flushing.
8.Condenser flood test.
9.Trial run of CEPs
10.Commissioning of generator gas system.
11.Generator ATT.
12.Calibration of HPCVs and IPCVs
13.Putting turbine on barring.
14.Vacuum pumps trial run.
15.Commissioning of seal steam system.
16.Commissioning of HP and LPBP system.
17. Vacuum pulling.
18.Lube oil flushing of TDBFP.
19.Steam blowing of TDBFP steam line.
20.Commissioning of TDBFP.
MS Line HT
CRH Line HT
HRH Line HT
MS Line Welding
Completion ( 30 Pen)
CRH Line Welding
Completion ( 12 Pen)
HRH Line Welding
Completion (34 Pen)
MS Line Hanger Erection
Cold Setting
CRH Line hangers Cold
Setting
HRH Line Hangers Cold
Setting
MS Line Insulation
CRH Line Insulation
HRH Line Insulation
STATOR COOLING WATER
FUR DRAFT SYSTEM
SEC AIR SYSTEM
TG ON BARRING
BRP TRIAL RUN
TG LUBE OIL / GEN SEAL
OIL SYSTEM
POWER CYCLE PIPING STEAM BLOWING
FURNACE READINESS
FUEL OIL SYSTEM
READINESS
CHEMICAL CLEANING OF
BOILER
AUX PRDS READINESS
UNIT SYNCHRONIZTION
CONDENSER VACCUM
SYSTEM
COMPRESSED AIR
SYSTEM READINESS
MDBFP Trial
CEP Trial
CW SYSTEM READINESS
TG SEAL STEAM SYSTEM
GATES, DAMPERS /
VALVES
TG :
TG CONTROL FLUID SYS
SG : (13 / 190 )
MFT CHECKING
DDCMIS
FSSS READINESS
TG GOV SYSTEM
GEN GAS SYSTEM
Discussion
Questions Please
Enlighten Us
Evaporator – heat absorption
Reduced number of evaporator wall tubes.
 Ensures minimum water wall flow.
SPIRAL WALL ARRAMGEMENT AT BURNER BLOCK AREA :
Support System for Evaporator Wall
• Spiral wall
 Horizontal and vertical buck stay with tension strip
• Vertical wall  Horizontal buck stay