Post on 24-Feb-2021
SPEAKER: SHRI S.K. GHOSH,
DY. CE, DSTPS, DVC, ANDAL
SOLAR & WIND CAPACITY (GW)
As on 31ST. August,
2020
Expected in
Year, 2021-22
Solar 36.49 100
Wind 37.70 60
Biomass 9.95 10
Small hydro 4.65 5
Total 88.79 175
INSTALLED CAPACITY
As on 30.08.2020 As on 31.03.2022 As on 31.03.2030
(GW) (%) (GW) (%) (GW) (%)
Thermal (Excluding Gas):
206.46 55.40 217.00 45.30 267.00 32.10
Hydro: 45.69 12.30 51.00 10.65 73.00 8.80
Gas: 24.96 6.70 26.00 5.43 25.00 3.00
Nuclear: 6.78 1.80 10.00 2.09 17.00 2.00
Renewable: 88.79 23.80 175.00 36.53 450.00 54.10
Total: 372.69 100.00 479.00 100.00 832.00 100.00
POWER POSITION IN WORLD
LEVEL
COAL FIRED POWER GENERATION ACCOUNTS FOR ABOUT 40% OF WORLD ELECTRICITY GENERATION The coal fired power generation is widely used in high energy consuming countries such as China, India & the USThe proportion of coal fired power generation is about 34% in Japan
PERCENTAGE OF EACH GENERATION RESOURCE
180
177
174
172
171
172
175
178
179
180
182
181
181
179
178
178
178
175
175
185
190
190 187
186
29 27 25 22
23
23
23
41
59
80
94
102
108.0
82
105
93
81
62
44
33 32 29
29
29
29
111
111
110
111
110
111
112
96
77
58
46 3
9
32.6
65
35
45
57
76
92
102
109
117
117
115
114
0
25
50
75
100
125
150
175
200
1 2 3 4 5 6 7 8 9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
GW
Hours
Total Load (2021-22) RES (S+W) BAU Coal BAU
PROJECTED DEMAND & GENERATION ON THE DAY 27TH JULY,2021
BAU – Business as usual
• Low PLF and flexible operation of thermal power plants
• Balancing capacity and steep ramping requirements
• Shortage of natural gas
• Low VM & High ash content in coal
• Implementation of new environmental norms
• Sustained supply of Coal for daily generation
• Ash disposal
• Pump storage
CHALLENGES – PRESENT AND EMERGING IN INDIAN POWER MARKET
ROAD MAP FOR FLEXIBLE
OPERATION
1. Hydro plants are especially suitable for quick supply of power. Pump storage,
existing and under construction, shall be used exclusively for meeting the
peak load or balancing the system.
2. Gas power plants have better start stop capability and need to contribute to
flexible generation as much as possible.
3. 210 MW & 500 MW units shall be operated at lower MTL than bigger size
units.
4. Among the fleet of (200 MW, 500/600 MW or 660/800 MW) thermal units, which
are efficient and have low ECR, should be given preference over other units in
terms of generation schedule.
ACTION PLAN TO MEETUP CHALLENGES
5. Test run/ study of thermal units for operation at low load shall beconducted as has been done for NTPC plants & presently beingundertaken for DVC, DSTPS & MPL, MAITHON.
6. Capex to be reimbursed on actual basis after examination,Regulatory intervention is required.
7. The skills of plant operators to enhance to meet up present
requirement .
ACTION PLAN TO MEETUP CHALLENGES
Merit economics for supporting flexibility
Scheduling in flexible regime with all India Merit Order Dispatch based on ECR
Categorization of units
SymbolCategor
y
Capacity
RangeCapacity
No. of
units
X Low flexible660 to 800
MW68160 98
Y Flexible490 to 600
MW70770 133
ZVery
Flexible
195 to 360
MW67640 285
TSOTwo shift
operation< 151 MW 10564 110
Total 217134 626
Scheduling Case Study
Factors considered for
selection of a thermal unit:
1. Unit heat rate
2. Load centre unit
3. Pit head unit
4. Old units
5. New units
6. Merit Order/ ECR
7. Super critical/ Sub-critical
8. Size of unit
• Boiler tubes, bends, water walls etc. - life consumption from fatigue, creep-fatigue, corrosion, expansion
• Turbine valves, casings, rotors – life consumption
• Achieving very low firing rates
• Other impacts
– air heater corrosion and leakage
– lower efficiency, incr. cost
– higher emissions
PLANT AREAS TO CONSIDER
Command Area of 24,235 sq. kms
State Districts Covered
West Bengal East & West Bardhaman, Hooghly, Howrah, Purulia & Bankura
Jharkhand Bokaro, Dhanbad, Hazaribagh, Chatra, Latehar, Koderma, Giridih, & Jamtara
DVC’s FUTURE INITIATIVES FOR
THE PUMP STORAGE & RE POWER
DVC INITIATIVES - LUGU PAHAR PUMP STORAGE PROJECT
Pumped Storage project at Lugu Pahar on Bokaro river in Jharkhand with maximum capacity of 1500 MW (6x250 MW)
Project considered by Expert Appraisal Committee (EAC) of MOEF & CC.
LOA for preparation of DPR by consultant is expected by November 2020.
Expected finalization of DPR by May 2022. Project completion by March 2028 (construction time - 60 months).
DVC PUMP STORAGE HYDRO
DVC’S INITIATIVES – RENEWABLE ENERGY
• Floating Solar Plant on reservoirs at Maithon, Panchet, Tilaiya & Konar having a total
capacity of 2000 MW under UMREPP & CPSU Schemes of MNRE, GOI:
JV proposal (between DVC & NTPC) is under process of approval of DVC Board.
Expected completion: Phase wise up to 2024.
Ground Solar plant of 50 MW capacity at DVC Panchet:
Through Developer Mode (DBOT-Design Built Operate Transfer).
Price Bid Opened on 24.09.20 and in process of approval from DVC Board for award.
Completion time : 1 year after signing of PPA.
INITIATIVE OF DVC, DSTPS ON
FLEXIBLE OPERATION &
EXPERIENCES
DSTPS HAVE EXPERIENCE TO RUN BOTH UNITS (2X500MW) SUCCESSFULLY AT 55% RATED
CAPACITY.
RAMP UP RATE 1.2% & RAMP DOWN RATE 0.6% ACHIEVED SUCCESSFULLY.
DURING MTL FOLLOWING ISSUES ARE PROMINENT:- SOMETIMES MAJOR PROBLEMS FACED CAUSING HINDRANCE TO LOW LOAD OPERATION I.E. POOR
FLAME INTENSITY & FURNACE INSTABILITY DUE TO POOR COAL QUALITY
LOW FURNACE TO WB DP
LOW APH O/L TEMPERATURE
2ND TDBFP RE-CIRCULATION VALVE OPENING
STALLING OF 2ND FD FAN
HIGH CONDENSER VACUUM DURING PEAK WINTER: INCREASING TREND OF TG VIBRATION
EXPERIENCEs OF DSTPS ON FLEXIBLE OPERATION (UPTO 55%)
WBDP, COND. VACUUM & FG TEMP AT APH O/L DURING LOW LOADUNIT # 1 UNIT # 2
Date 10.02.20 11.02.20 12.02.20 13.02.20 10.02.20 11.02.20 12.02.20 13.02.20
Load(MW) 290 285 280 310 295 290 292 320
WBDP(MMWC) 60 58 55 70 50 48 48 60
COND VACCUM (BACK PR.) (KG/CM2)
0.048 0.049 0.049 0.0537 0.048 0.049 0.049 0.054
APH O/L FG (DEG) 114/117 111/113 109/112 114/116 101/103 103/105 106/108 108/109
Other than winter at same load Vacuum and Flue Gas temp AT APH outlet maintain in the range of 0.07 to 0.08 kg/cm2 and 115-120 deg C respectively.
SOME CRITICAL OPERATIONAL PARAMETERS OF DSTPS UNITS
FW
W
AT 3
0
to 4
5
MTR E
L
RW
W 3
0
MTR E
L
LH
S
WATER
WALL 4
5
MTR E
L
Rear
WW
AT 3
0 t
o 4
5 M
TR E
L
Left
WW
AT
45 M
TR E
L
FW
W A
T 3
0 t
o 4
5 M
TR
EL
FRONT WATER WALL AT
30 TO 45 METRE
ELEVATION
LEFT WATER WALL AT
45 METRE ELEVATION
REAR WATER WALL AT
30 TO 45 METRE
ELEATION
IMPACTS OF CYCLIC LOAD OPERATION OF DSTPS UNIT#1
MIGHT BE THE IMPACT OF CYCLIC LOAD
OPERATION : DEMAND MORE FREQUENCY OF
INSPECTION THAN NORMAL: IMPACT ON
COST
RH
front
Panel
Ext.
WW
LH
SW
W
BOILER TUBE LEAKAGE – WATER WALL AT DSTPS UNITs
RHS FRONT PANEL
EXT WATER WALL
LHS WATER WALL
BOILER TUBE LEAKAGE –WATER WALL AT DSTPS UNITS
RHS WATER TUBE NO. 37
WALL 45 MTR EL.
SAMPLE OF FAILED TUBE
PREVETIVE ACTION:
TAKING MORE
CONCENTRATION ON
BOILER WATER CHEMISTRY
I.E. CPU OPERATION,
INCREASE IN BOILER BLOW
DOWN FREQUENCY
PITTING OF LP TURBINE FIXED BLADES OF DSTPS UNIT#1
• MIGHT BE THE IMPACT OF LOW LOAD OPERATION AT HIGH CONDENSER VACUUM
• DEMANDS REVIEW OF FREQUENCY OF INSPECTION / OH SCHEDULE
• IMACT ON CAPITAL COST
• PRESENTLY IGEF IS GIVING SUPPORT SERVICE FOR MINIMUM LOAD TRIAL OPERATION
(40% OF RATED CAPACITY) FOR DSTPS UNIT#1 (500MW).
• DUE TO PRESENT COVID-19 ISSUE SUPPORT SERVICES ARE BEING PROVIDED THROUGH
VCs.
• DSTPS SHARED OPERATIONAL DATA FROM DCS FOR ANALYSIS BY IGEF EXPERTS.
• IGEF SHARED THE PROJECT REPORT OF SUCCESSFUL TRIAL OPERATION AT 40% RATED
CAPACITY OF ONE OF THE 500 MW UNITs OF NTPC, DADRI.
LOW LOAD (40% MINIMUM) TRIAL OPERATION
SUPPORT SERVICE BY IGEF FOR DSTPS
• PRE-TEST DATA ASSESSMENT REPORT & TEST PROCEDURE FOR MIN LOAD / FAST LOAD
RAMPS SUBMITTED BY IGEF EXPERTS & BRIEFED IN THE VC WITH DSTPS OFFICIALS.
PRELIMINARY OBSERVATION & RECOMMENDATION:
LOW LOAD (40% MINIMUM) TRIAL OPERATION
SUPPORT SERVICE BY IGEF FOR DSTPS
REMOTE CONNECTIVITY OF UNIT DCS WITH SIEMENS SPPA T 3000
SYSTEM.
BOILER COMBUSTION OPTIMISATION : COAL FLOW MEASUREMENT IN
ONE COAL ELEVATION
USE OF MIDDLE RANKING COAL FOR FLAME STABILITY
TUNING OF IMPORTANT AUTO LOOPS LIKE BOILER DRUM LEVEL, S/H
STEAM TEMP CONTROL, FURNACE TO W.B. DP CONTROL ETC.
DSTPS SHALL ACHIEVE THE
MISSION SUCCESSFUL
IN ATTAINING
40% MINIMUM LOAD SHORTLY
UNDER THE GUIDANCE OF IGEF
Thank You