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Welcome
OVER VIEW OF 2*800 MW SRI
DAMODARAM SANJEEVAIAH THERMAL
POWER STATION
contents
Location Nellore, Andhra
Pradesh
Status Under Construction
Construction cost 8432/- crores
Owner(s) APPDCL
Operator(s) APG...
Fuel
• Domestic washed coal & imported coal in 70:30 ratio with
27.5% Ash
• GCV(gross calorific value) of 4,800 kCal/kg sh...
Fuel
• Coal is mined from Kalinga ghat , Talcher Coalfield, Angul
district , Orissa
• shipped to krishnapatnam port by MGR...
stacker
Fuel
Pulverisation
 Fine powder of coal ,grinded by millers is fed into
furnace by hot air(primary air).
 Secondary air is fe...
MILLS
A Mill is a mechanical device for the grinding coal upto
desired fineness
There are 6 mills , located adjacent to fu...
Furnace
• Tangential firing-flame envelope rotates ensuring through
mixing within the furnace
• Heat energy is transferred...
Furnace
• Heat generating rates of 1.5x 106
kJ/m3
/hr can be
achieved
• Maximum amount of coal can be achieved with min
. ...
Ash handling plant
• Ash generated is about 30-40%of fuel consumption.
• Must be removed time to time
• due to hotness , d...
Bottom ash removal system
• Non combustible residue of combustion of furnace is
bottom ash
• Bottom ash falls from furnace...
Electrostatic precipitator
An ESP is a filtration device that removes fine
particles from a flowing gas using the force of...
Electrostatic precipitator
• Dirt particles are negatively charged
• They are attracted to the positively charged plates
a...
ESP
• collected in ESP hoppers
• We have 8X8 hoppers
Fly ash removal
system
Fly ash removal system
• Pneumatically send to silo and then to trucks
• Fly ash is used in
1.production of cement clinker...
Water treatment plant
• Through ion exchange process , RO and filtration by
resin beds water is demineralised
Water treatment plant
DEMINERALISED(DM) Water
parameter value
Conductivity <0.2 μS / Cm at 25 Deg.C
pH value 9 - 10 at 25 Deg.c
Total silica <0....
Sea water
PARAMETERS AS VALUE
pH - 7.6
Turbidity NTU 10
P-alk / M- alk as CaCO3 ppm 98
Ca hardness as CaCO3 ppm 1100
Mg ha...
Babcock and Wilcox boiler
• Boiler is a device for generating steam for power, processing
and heating purposes
• Supercrit...
Supercritical boiler
• steam turbine efficiency improves significantly compared to
the typical subcritical cycle.
• The lo...
Classification Supercritical boiler
UP
Universal Pressure (UP®
) boiler.
• The original B&W boiler for supercritical applications was the
Universal Pressure (UP®...
SWUP
Spiral Wound Universal Pressure
Boiler
• Designed for both base load and variable pressure load cycling
operation as well ...
Spiral Wound Universal Pressure
Boiler
SPECIFICATIONS
• Capacity, steam output:
From 2,000,000 lb/h (252 kg/s) to more tha...
Vertical Tube Universal Pressure
Boiler
• A once-through boiler, applied to systems with a capacity
of 400 MW or larger
SP...
BOILER
Main steam flow..........2600 T/hr
SH steam press..............255 kg/cm2 (g)
SH steam temp..............568° C
Fee...
BOILER
Fuel Design Range
GCV, kCal/kg 4800 4000-5000
Moisture, % 9.5 6.0-20.0
Ash, % 27.5 25.0-34.0
Volatile matter,% 28.5...
Boiler accessories
Economizer
Waste heat of the flue gases is utilized for heating the feed
water
Air Pre-heater
Transfers...
Boiler accessories
P.A.Fan (two per unit-50% capacity each)
designed for handling atmospheric air upto a
temperature of 50...
Boiler accessories
• SCR technology
1.Converts NOX into N2 and water .
2.Anhydrous/aqueous NH3 or urea is added to stream ...
SCR
• SCR incorporating Ammonia Injection Grid (AGI) and
IsoSwirl Mixing system
economizer
Steam Turbine
• Being a form of engine , requires in order to function a
suitable working fluid a source of high grade ene...
Steam Turbine
• Greater heat drop
• Absence of internal lubrication(no filters)
• Develops many times the power compared t...
Steam Turbine
• The cylinder(stator) contains fixed blades , vanes and
nozzles that direct steam into moving blades(rotor)...
Steam Turbine
• The rotor of large steam turbine consists of large ,
intermediate and low pressure sections.
• change in d...
Turbine name plate details
Output 800,000kW
Speed 3000rpm
HP STEAM PRESS. 24.2MPa(a)
HP STEAM TEMP 565 deg
Cooling tower(hyperbolic)
• Required when positive control of temperature is
required
• Rate of evaporation of water depen...
Cooling tower(hyperbolic)
• It is necessary to precool the hot water from condenser So
(Two-Ts ) Is high
• Vacuum at conde...
Cooling tower(hyperbolic)
• Height = Plan------circular
• Diameter= Profile---hyperbolic
• (inside)
Cooling tower(hyperbolic)
• Steel reinforced concrete structure
• Mostly hollow inside
• Bottom is 10m above air-intake
• ...
Active power – 604.35MW
Reactive power – 46.35MVAR
Generator kV : R-Y – 24.32kV
: Y-B – 24.32kV
: B-R – 24.23kV
Generator ...
FIELD PARAMETERS
• Field voltage : 288.33V
• Field current : 3452.6A
• Rotor temperature : 65.13’c
• POS 90R(AUTO) : 101.3...
Fig. 19 Switchyard
 Switchyard is a part of electrical generation, transmission and distribution
system.
 Switchyard gen...
Fig. 20 Circuit Breaker
 Circuit breaker: A circuit breaker is an automatically operated electrical
switch designed to pr...
Fig. 21 Lightning arrester
 Insulators: The insulators provide necessary insulation between line
conductors and supports ...
Fig. 22 Voltage transformer
 Voltage transformer: These are necessary for isolating the protection,
control and measureme...
Fig. 23 Current transformer
 Current transformer: To feed the current circuits in protection systems
employing secondary ...
Thank you
by
HARSHA.S
OVERVIEW OF SUPERCRITICAL THERMAL POWERPLANT , DPSTS
OVERVIEW OF SUPERCRITICAL THERMAL POWERPLANT , DPSTS
OVERVIEW OF SUPERCRITICAL THERMAL POWERPLANT , DPSTS
OVERVIEW OF SUPERCRITICAL THERMAL POWERPLANT , DPSTS
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OVERVIEW OF SUPERCRITICAL THERMAL POWERPLANT , DPSTS

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overview of supercritical thermal power plant

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OVERVIEW OF SUPERCRITICAL THERMAL POWERPLANT , DPSTS

  1. 1. Welcome
  2. 2. OVER VIEW OF 2*800 MW SRI DAMODARAM SANJEEVAIAH THERMAL POWER STATION
  3. 3. contents
  4. 4. Location Nellore, Andhra Pradesh Status Under Construction Construction cost 8432/- crores Owner(s) APPDCL Operator(s) APGENCO Primary fuel Coal-fired Units operational 1*800 MW Name plate capacity 1600 MW
  5. 5. Fuel • Domestic washed coal & imported coal in 70:30 ratio with 27.5% Ash • GCV(gross calorific value) of 4,800 kCal/kg shall be used as a fuel during normal operation • LDO(light diesel oil) as well as HFO(heavy fuel oil) shall be used as a startup as well as support fuel
  6. 6. Fuel • Coal is mined from Kalinga ghat , Talcher Coalfield, Angul district , Orissa • shipped to krishnapatnam port by MGR trains and Coal barges and loaded to conveyer belt by stacker
  7. 7. stacker Fuel
  8. 8. Pulverisation  Fine powder of coal ,grinded by millers is fed into furnace by hot air(primary air).  Secondary air is fed into furnace to complete combustion.  Amount of primary air depends on load(>3%)  High thermal efficiency  Better control over load fluctuations  Free from clinker and slagging troubles
  9. 9. MILLS A Mill is a mechanical device for the grinding coal upto desired fineness There are 6 mills , located adjacent to furnace at ‘0’ M level
  10. 10. Furnace • Tangential firing-flame envelope rotates ensuring through mixing within the furnace • Heat energy is transferred through radiation (80%) and convection(20%).
  11. 11. Furnace • Heat generating rates of 1.5x 106 kJ/m3 /hr can be achieved • Maximum amount of coal can be achieved with min . space and time • Through tip(vertical arc) temperature can be varied upto 1000 c • So constant superheat temperature can be maintained
  12. 12. Ash handling plant • Ash generated is about 30-40%of fuel consumption. • Must be removed time to time • due to hotness , difficult to handle
  13. 13. Bottom ash removal system • Non combustible residue of combustion of furnace is bottom ash • Bottom ash falls from furnace to ash sluice trench and discarded to ash pond after mixing with water
  14. 14. Electrostatic precipitator An ESP is a filtration device that removes fine particles from a flowing gas using the force of an induce electrostatic charge minimally impeding the flow of gases through the unit.
  15. 15. Electrostatic precipitator • Dirt particles are negatively charged • They are attracted to the positively charged plates and stick there • From time to time, the collecting plates are shaken to empty away the soot (rapping mechanism)
  16. 16. ESP
  17. 17. • collected in ESP hoppers • We have 8X8 hoppers Fly ash removal system
  18. 18. Fly ash removal system • Pneumatically send to silo and then to trucks • Fly ash is used in 1.production of cement clinkers, concrete, ceilings 2.structural fills , agricultural purposes, floor etc
  19. 19. Water treatment plant • Through ion exchange process , RO and filtration by resin beds water is demineralised
  20. 20. Water treatment plant
  21. 21. DEMINERALISED(DM) Water parameter value Conductivity <0.2 μS / Cm at 25 Deg.C pH value 9 - 10 at 25 Deg.c Total silica <0.02 ppm as SiO2 Iron as Fe Not detectable as per ASTM methods Free CO2 ppm (as CO2 ) “ Total Hardness “
  22. 22. Sea water PARAMETERS AS VALUE pH - 7.6 Turbidity NTU 10 P-alk / M- alk as CaCO3 ppm 98 Ca hardness as CaCO3 ppm 1100 Mg hardness as CaCO3 ppm 5050 Chloride as Cl % 1.89 Silica SiO2 ppm 3.8
  23. 23. Babcock and Wilcox boiler • Boiler is a device for generating steam for power, processing and heating purposes • Supercritical boiler operates above critical point
  24. 24. Supercritical boiler • steam turbine efficiency improves significantly compared to the typical subcritical cycle. • The load change rate capability of the system is not restricted by the turbine • Steam temperature at the inlet and outlet of the reheater is nearly constant over a wide load range • The boiler feedwater pump power is significantly reduced at lower loads • Short startup times
  25. 25. Classification Supercritical boiler
  26. 26. UP
  27. 27. Universal Pressure (UP® ) boiler. • The original B&W boiler for supercritical applications was the Universal Pressure (UP® ) boiler. • These boilers, nine of which are in operation, are among the largest capacity fossil fuel boilers in the world. SPECIFICATIONS • Capacity, steam output: 700,000 lb/h (90 kg/s) • Pressure: Subcritical, usually 1800 to 2400 psi throttle pressure with 5% overpressure capability. • Superheater and reheater outlet temperatures: 538 to 566C • Fuel:Pulverized coal.
  28. 28. SWUP
  29. 29. Spiral Wound Universal Pressure Boiler • Designed for both base load and variable pressure load cycling operation as well as on-off cycling operation. • The unique feature of this boiler, compared to other boilers, is that the tubes in the furnace, from the lower furnace inlet headers to a location near the furnace arch, are wound around the furnace circumference rather than being vertical. • This design allows the fluid in the tubes to pass through the various heat flux zones around the furnace providing a more uniform outlet enthalpy.
  30. 30. Spiral Wound Universal Pressure Boiler SPECIFICATIONS • Capacity, steam output: From 2,000,000 lb/h (252 kg/s) to more than 10,000,000 lb/h (1260 kg/s). • Operating pressure: 3500 psi (24.1 MPa) throttle pressure with 5% overpressure; higher pressures available. • Superheater steam temperatures: As required, currently in the 595C range. • Fuel:Pulverized coal. ​
  31. 31. Vertical Tube Universal Pressure Boiler • A once-through boiler, applied to systems with a capacity of 400 MW or larger SPECIFICATIONS • Capacity, steam output: 252 kg/s to more than 1260 kg/s. • Operating pressure: 3500 psi throttle pressure with 5% overpressure; higher pressures available. • Superheater steam temperatures: currently in the 595C range. • Fuel:Pulverized coal. ​
  32. 32. BOILER Main steam flow..........2600 T/hr SH steam press..............255 kg/cm2 (g) SH steam temp..............568° C Feedwater temp............307° C RH steam flow...............2052 T/hr RH steam press.............57.8 kg/cm2 (g) RH steam temp..............596° C Height............................
  33. 33. BOILER Fuel Design Range GCV, kCal/kg 4800 4000-5000 Moisture, % 9.5 6.0-20.0 Ash, % 27.5 25.0-34.0 Volatile matter,% 28.5 20.0-33.0 Fixed carbon,% 34.5 24.0-40.0 HGI 50 5-55
  34. 34. Boiler accessories Economizer Waste heat of the flue gases is utilized for heating the feed water Air Pre-heater Transfers heat from flue gases to primary/secondary Air by means of rotating heating surface elements Super heater Increases the temperature of the steam above its saturation point
  35. 35. Boiler accessories P.A.Fan (two per unit-50% capacity each) designed for handling atmospheric air upto a temperature of 500 c F.D.Fan (two per unit-50% capacity each) designed for handling secondary air for the boiler I.D.Fan (two per unit-50% capacity each) 1. located between ESP and chimney. 2.used for sucking flue gas from furnace
  36. 36. Boiler accessories • SCR technology 1.Converts NOX into N2 and water . 2.Anhydrous/aqueous NH3 or urea is added to stream of ………flue gases and is adsorbed onto a catalyst 4NO + 4NH3+ O2 → 4N2 + 6H2O 3.They reduce NOx by 70-95%
  37. 37. SCR • SCR incorporating Ammonia Injection Grid (AGI) and IsoSwirl Mixing system economizer
  38. 38. Steam Turbine • Being a form of engine , requires in order to function a suitable working fluid a source of high grade energy and sink of low grade energy Low presure module of sft 100 alstom
  39. 39. Steam Turbine • Greater heat drop • Absence of internal lubrication(no filters) • Develops many times the power compared to reciprocating engines 3 stage turbine (tandem compounded)
  40. 40. Steam Turbine • The cylinder(stator) contains fixed blades , vanes and nozzles that direct steam into moving blades(rotor) • The rotor are completely enclosed in a alloy steel outer case (one capable of withstanding high pressures and temperatures).
  41. 41. Steam Turbine • The rotor of large steam turbine consists of large , intermediate and low pressure sections. • change in direction of motion gives rise to a change of momentum or force • this is driving force of the primemover Four Cylinder Turbines
  42. 42. Turbine name plate details Output 800,000kW Speed 3000rpm HP STEAM PRESS. 24.2MPa(a) HP STEAM TEMP 565 deg
  43. 43. Cooling tower(hyperbolic) • Required when positive control of temperature is required • Rate of evaporation of water depends on 1 amount of water surface area exposed 2 time of exposure and R .H of air 3 (inlet air WBT-water inlet temperature)
  44. 44. Cooling tower(hyperbolic) • It is necessary to precool the hot water from condenser So (Two-Ts ) Is high • Vacuum at condenser can be maintained • It comprises of 30% of budget • Due to large base , withstands hurricanes • No fanes are needed • Chimney shape creates it own draught
  45. 45. Cooling tower(hyperbolic) • Height = Plan------circular • Diameter= Profile---hyperbolic • (inside)
  46. 46. Cooling tower(hyperbolic) • Steel reinforced concrete structure • Mostly hollow inside • Bottom is 10m above air-intake • Force causing air to flow F=H(w0-wi)
  47. 47. Active power – 604.35MW Reactive power – 46.35MVAR Generator kV : R-Y – 24.32kV : Y-B – 24.32kV : B-R – 24.23kV Generator Amps : R-ph – 14.14kA : Y-ph – 14.33kA : B-ph – 14.61kA Frequency : 49.97Hz P.F : 1.00 GENERATOR PARAMETERS
  48. 48. FIELD PARAMETERS • Field voltage : 288.33V • Field current : 3452.6A • Rotor temperature : 65.13’c • POS 90R(AUTO) : 101.36% • POS 70E(MANUAL) : 147.89%
  49. 49. Fig. 19 Switchyard  Switchyard is a part of electrical generation, transmission and distribution system.  Switchyard generally have circuit breakers, CT’s ,PT’s, Bus bars, Transformers, Protection control equipments, Switches etc.,.
  50. 50. Fig. 20 Circuit Breaker  Circuit breaker: A circuit breaker is an automatically operated electrical switch designed to protect an electrical current from damage caused by overload or short circuit. The basic function of CB is to detect a fault condition and, by interrupting continuity to immediately discontinue electrical flow.
  51. 51. Fig. 21 Lightning arrester  Insulators: The insulators provide necessary insulation between line conductors and supports and thus prevent any leakage current from conductors to earth.  Lightning Arrester: It is a device used on electrical power systems and telecommunication systems to protect insulation and conductors of the system from the damaging effects of lightning.
  52. 52. Fig. 22 Voltage transformer  Voltage transformer: These are necessary for isolating the protection, control and measurement equipment from the high voltages of the power system. These are used to supply appropriate values of voltages to the equipment.
  53. 53. Fig. 23 Current transformer  Current transformer: To feed the current circuits in protection systems employing secondary relays current transformers are used.  Bus coupler: Two different bus sections of two different power transformers are connected by means of a bus coupler.  Relay: It gives a tripping signal in case of any irregularity or faults.
  54. 54. Thank you by HARSHA.S

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