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Presentation on theme: "Enhancing Capacity – Empowering Nation Presentation on
Supercritical Boilers 28 August 2012." — Presentation transcript:
Slide 1
Enhancing Capacity – Empowering Nation Presentation on Supercritical Boilers 28 August
2012
Slide 2
D ow nl oa d C od e
Enhancing Capacity – Empowering Nation Presentation on Supercritical Boilers 28 August 2012.
Publish Kieran Willson, Modified 11 months ago
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► Gas Fired Steam Boiler
► Water Tube Steam Boiler
► Boiler Plant Ef ficiency
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8/19/2019 ⚡Presentation _Enhancing Capacity – Empowering Nation Presentation on Supercritical Boilers 28 August 2012
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Enhancing Capacity – Empowering Nation Presentation on Supercritical Boilers 28 August 2012 Contents BHEL Steam
Generators Emerging Market Requirements Trends in Cycle parameters Supercritical Boilers Major Systems Startup
System Pressure part Arrangement Firing System High Temperature Materials Ultra Supercritical Boilers Advanced Ultra
Supercritical Boilers
Slide 3
Enhancing Capacity – Empowering Nation Presentation on Supercritical Boilers 28 August 2012 BHEL Utility Units - A
Summary 62 % Total Installed Capacity of India is Contributed by BHEL Utility Sets
Slide 4
Enhancing Capacity – Empowering Nation Presentation on Supercritical Boilers 28 August 2012
UnitContractedCommissioned VU 404645 VU 40 S15 VU 603819 MU33 VP2316 V2RV2R17 HRSG177121 AFBC7259
CFBC2810 Others28 Total447333 BHEL Industrial Units - A Summary
Slide 5
Enhancing Capacity – Empowering Nation Presentation on Supercritical Boilers 28 August 2012 BHEL is currently
adopting Advanced Steam Cycles to Improve the Environmental & Economic Performance of India’s Power Generation
Slide 6
Enhancing Capacity – Empowering Nation Presentation on Supercritical Boilers 28 August 2012 Reference List of
Supercritical Boilers NTPC / BARH 2 x 660MW APPDCL / Krishnapatnam 2 x 800 MW PPGCL / BARA 3 x 660 MW RPCL /
Yermaras 2 x 800 MW RPCL / Edlapur1 x 800 MW KPCL / Bellary 1 x 700 MW LPGCL/Lalithpur- BHL3 x 660 MW DB
Power / Singrauli2 x 660 MW NTPC / Mouda St. II 2 x 660 MW 18 Boilers Contracted
Slide 7
Enhancing Capacity – Empowering Nation Presentation on Supercritical Boilers 28 August 2012 Emerging Market
Requirements For Thermal Power Generation High Reliability & Availability Highest Plant efficiency Suitable for
differing modes of operation Suitable for varying fuel quality Minimum emission of Pollutants Lowest cost
Slide 8
Enhancing Capacity – Empowering Nation Presentation on Supercritical Boilers 28 August 2012 Higher Plant efficiency
for Conservation of fuel resources Reduction of Atmospheric Pollutants - CO 2, SO X & NO X
Slide 9
Enhancing Capacity – Empowering Nation Presentation on Supercritical Boilers 28 August 2012 Measures to improve
Plant Efficiency Cycle Parameters : Higher steam parameters with Once Thro’ Boilers Boiler side measures : Highest
Boiler Efficiency Minimum RH spray Minimum SH spray (if tapped off before feed heaters) Reduced auxiliary power
consumption
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Slide 10
Enhancing Capacity – Empowering Nation Presentation on Supercritical Boilers 28 August 2012 Increase of Plant Cycle
Efficiency due to Steam Parameters
Slide 11
Enhancing Capacity – Empowering Nation Presentation on Supercritical Boilers 28 August 2012 500 MW Steam
Generator Coal Consumption and Emissions
Slide 12
Enhancing Capacity – Empowering Nation Presentation on Supercritical Boilers 28 August 2012 Current Trends in
Steam Parameters 1980s: Pressure increased from 175-180 bar to 225 bar; Temperature mostly around 540 °C 1990 :
Pressures raised to 285 bar; Temperature raised to 565-580-600 °C 300 bar & 620 °C not unusual today 255 bar &
568/596 °C commonly used presently
Slide 13
Enhancing Capacity – Empowering Nation Presentation on Supercritical Boilers 28 August 2012 Coal will continue to
have maximum share towards installed capacity for electricity at least upto 2050 CLEAN COAL TECHNOLOGY –Minimise
CO 2 emissions and environmental impact –Extend life of coal reserves Approach: Develop technology for SC, USC &
Adv-USC power plants
Slide 14
14 #The improvements are with respect to the best units under construction in India Extension of coal reserves by
11% Competitive in electricity cost on deployment Efficiency and CO 2 Emission Plant type with power rating Steam
Pressure (kg/cm 2 ) Steam Temperature ( C) Efficiency (%) CO 2 Emissions (g/kW-hr) Sub Critical (500 MWe)
17054035900 # Super Critical 24756540830 Ultra Super Critical 25060042784 Advanced Ultra Super Critical
30070045740
Slide 15
Enhancing Capacity – Empowering Nation Presentation on Supercritical Boilers 28 August 2012 Trend in unit sizes &
Cycle parameters Unit Size SHO Pressure (kg/cm 2 (a)) SHO/RHO Temperature (Deg.C) Year of Introduction 60 / 70
MW965401965 110 / 120 MW139540/5401966 200 / 210 MW137 / 156540/5401972 250 MW156540/5401991 500 MW
179 540/540 540/568 1979 1985 660 MW256568/5962008 800 MW256568/596 2008
Slide 16
Enhancing Capacity – Empowering Nation Presentation on Supercritical Boilers 28 August 2012 Type of boilers Drum
type - for sub-critical parameters Once-through type - for sub/super Critical Parameters
Slide 17
Enhancing Capacity – Empowering Nation Presentation on Supercritical Boilers 28 August 2012 Drum type boiler
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Steam generation takes place in furnace water walls Fixed evaporation end point - the drum Steam -water
separation takes place in the drum Separated water mixed with incoming feed water
Slide 18
Enhancing Capacity – Empowering Nation Presentation on Supercritical Boilers 28 August 2012 Types of Circulation
Slide 19
Enhancing Capacity – Empowering Nation Presentation on Supercritical Boilers 28 August 2012 Drum type boiler
Natural Circulation Boiler Circulation thru water walls by thermo-siphon effect Controlled Circulation Boiler At
higher operating pressures just below critical pressure levels, thermo-siphon effect supplemented by pumps
Slide 20
Enhancing Capacity – Empowering Nation Presentation on Supercritical Boilers 28 August 2012 Natural
CirculationControlled Circulation
Slide 21
Enhancing Capacity – Empowering Nation Presentation on Supercritical Boilers 28 August 2012 Pressure range Sub
critical : Below 221 bar Super critical : 221 bar and above What is Super critical pressure ?
Slide 22
Enhancing Capacity – Empowering Nation Presentation on Supercritical Boilers 28 August 2012
Slide 23
Enhancing Capacity – Empowering Nation Presentation on Supercritical Boilers 28 August 2012 Supercritical Boilers
Supercritical pressure boiler has no drum and heat absorbing surface being, in effect, one continuous tube, in which
the water & steam generated in the furnace water walls passes through only once hence called ‘Once through
Supercritical pressure boilers’ The water in boiler is pressurized by Boiler Feed Pump, sensible heat is added in feed
heaters, economizer and furnace tubes, until water attains saturation temperature and flashes instantaneously to dry
saturated steam and super heating commences.
Slide 24
Enhancing Capacity – Empowering Nation Presentation on Supercritical Boilers 28 August 2012 The Concept The mass
flow rate thru’ all heat transfer circuits from Eco. inlet to SH outlet is kept same except at low loads wherein
recirculation is resorted to protect the water wall system
Slide 25
Enhancing Capacity – Empowering Nation Presentation on Supercritical Boilers 28 August 2012 Increased mass flow
through spiral waterwall tubing, or improved heat transfer through rifled vertical wall tubing. No fixed evaporator
end point No thick wall components Features Once Through Boiler Flow Diagram Evaporator Water separator
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Feedwater Economizer FW- Pump Live steam Superheater
Slide 26
Enhancing Capacity – Empowering Nation Presentation on Supercritical Boilers 28 August 2012 Supercritical Boilers-
Major Systems
Slide 27
Enhancing Capacity – Empowering Nation Presentation on Supercritical Boilers 28 August 2012 General Arrangement of
Steam Generator – Elevation
Slide 28
Enhancing Capacity – Empowering Nation Presentation on Supercritical Boilers 28 August 2012 General Arrangement of
Steam Generator – Plan
Slide 29
Enhancing Capacity – Empowering Nation Presentation on Supercritical Boilers 28 August 2012 Once through
Supercritical Boilers Major differences from Drum type boiler : Evaporator system Low load Recirculation system
Separator
Slide 30
Enhancing Capacity – Empowering Nation Presentation on Supercritical Boilers 28 August 2012 Circulation Systems
Drum TypeOnce-through
Slide 31
Enhancing Capacity – Empowering Nation Presentation on Supercritical Boilers 28 August 2012 Once -through
Operating Range
Slide 32
Enhancing Capacity – Empowering Nation Presentation on Supercritical Boilers 28 August 2012 Once -thru Boiler
Requirements : Stringent water quality Different control system compared to drum type Low load circulation system
Special design to support the spiral furnace wall weight High pressure drop in pressure parts Higher design pressure
for components from feed pump to separator
Slide 33
Enhancing Capacity – Empowering Nation Presentation on Supercritical Boilers 28 August 2012 Features of Once
Through Steam Generator To ensure adequate mass flow rates through water wall, spirally wound water wall tubes are
used. Start-up and low load system up to 30-40% BMCR required. Feed water quality requirements are very stringent.
Can be designed for both sub-critical and super-critical pressures. Ideally suited for sliding pressure operation due to
the absence of thick walled components.
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Slide 34
Enhancing Capacity – Empowering Nation Presentation on Supercritical Boilers 28 August 2012 Once -thru Boiler
Evaporator system : Formed by a number of parallel tubes Tubes spirally wound around the furnace to reduce number
of tubes and to increase the mass flow rate thru’ the tubes Small tube diameter Arrangement ensures high mass
velocity thru the tubes
Slide 35
Enhancing Capacity – Empowering Nation Presentation on Supercritical Boilers 28 August 2012 Reduced number of
tubes with pitch. Increased mass flow. Mass flow rate can be selected by number of tubes. Features Spiral Tube
Arrangement
Slide 36
Enhancing Capacity – Empowering Nation Presentation on Supercritical Boilers 28 August 2012 Once -thru Boiler -Furnace Wall
Slide 37
Enhancing Capacity – Empowering Nation Presentation on Supercritical Boilers 28 August 2012 Spiral Water wall
Tubing Lateral Heat Flux Profile
Slide 38
Enhancing Capacity – Empowering Nation Presentation on Supercritical Boilers 28 August 2012 Sliding Pressure
Supercritical Design Spiral Wall Windbox
Slide 39
Enhancing Capacity – Empowering Nation Presentation on Supercritical Boilers 28 August 2012 SPIRAL WALL SUPPORT
Support Fingers Spiral to Vertical Transition Area - Load Transfer Sliding Pressure Supercritical Design
Slide 40
Enhancing Capacity – Empowering Nation Presentation on Supercritical Boilers 28 August 2012 Furnace Wall Designs
Spiral Wall ConfigurationVertical Wall Configuration
Slide 41
Enhancing Capacity – Empowering Nation Presentation on Supercritical Boilers 28 August 2012 Supercritical Boiler with
Vertical wall Unit Mw e: 750 Max. Continuous Rating: 2522 t/h SH Outlet Press: 262 bar SH Outlet Temp: 568°C RH
Outlet Temp: 596 °C Fuel: Sub-bituminous
Slide 42
Enhancing Capacity – Empowering Nation Presentation on Supercritical Boilers 28 August 2012 SCREEN TUBES
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SMOOTH TUBING FRONT WALL RIFLED TUBING SMOOTH TUBING FROM THIS ELEVATION ALL WALLS SIDE WALL
RIFLED TUBING REAR WALL RIFLED TUBING ARCH RIFLED TUBING HANGER TUBES SMOOTH TUBING FRONT WALL
RIFLED TUBING SIDE WALL RIFLED TUBING Vertical Wall Sliding Pressure Supercritical Design
Slide 43
Enhancing Capacity – Empowering Nation Presentation on Supercritical Boilers 28 August 2012 Vertical Furnace Wall
Design Vertical tube furnace walls will provide all the operational benefits of the currently popular spiral design while
significantly reducing the cost and construction time for the furnace and providing some reduction in pressure drop.
Slide 44
Enhancing Capacity – Empowering Nation Presentation on Supercritical Boilers 28 August 2012 Vertical Wall Design -
Advantages The tubes are self supporting. Transition headers at spiral/vertical interface are avoided. Ash hopper
tubing geometry simplified Corners are easier to form Reduced pressure drop, auxiliary power
Slide 45
Enhancing Capacity – Empowering Nation Presentation on Supercritical Boilers 28 August 2012 Spiral Vs. Vertical Wall
Comparison Spiral Furnace System Applicable for all size units Benefits from averaging of lateral heat absorption
variation (each tube forms a part of each furnace wall) Simplified inlet header arrangement Large number of operating
units Use of smooth bore tubing throughout entire furnace wall system One material utilized throughout entire
waterwall system No individual tube orifices – Less maintenance & pluggage potential Vertical Furnace Wall System
Limited to larger capacity units. Less complicated windbox openings Traditional furnace water wall support system
Elimination of intermediate furnace wall transition header Less welding in the lower furnace wall system Easier to
identify and repair tubes leaks Lower water wall system pressure drop thereby reducing required feed pump power
Slide 46
Enhancing Capacity – Empowering Nation Presentation on Supercritical Boilers 28 August 2012 Vertical Wall Wind box
Straight Tubes Only a Few Bends at the Top and Bottom
Slide 47
Enhancing Capacity – Empowering Nation Presentation on Supercritical Boilers 28 August 2012 Supercritical Boilers-
Start-up and Low load recirculation Systems
Slide 48
Enhancing Capacity – Empowering Nation Presentation on Supercritical Boilers 28 August 2012 Low load system with
circulating pump
Slide 49
Enhancing Capacity – Empowering Nation Presentation on Supercritical Boilers 28 August 2012 Once -thru Boiler
Separator : Separates steam and water during the circulating mode operation Runs dry during once-thru flow mode
Smaller in size compared to drum in a drum type boiler
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Slide 50
Enhancing Capacity – Empowering Nation Presentation on Supercritical Boilers 28 August 2012 Start-up System
Slide 51
Enhancing Capacity – Empowering Nation Presentation on Supercritical Boilers 28 August 2012 Overview of FiringSystems Close-Coupled Overfire Air Close-Coupled Overfire Air CFS Air Nozzle Tips Flame Attachment Coal Nozzle Tip
Flame Attachment Coal Nozzle Tip NOx < 0.18 – 0.30 kg/Mkcal* Furnace Diagonal Furnace Diagonal Separated
Overfire Air HP Pulverizer with Dynamic Classifier HP Pulverizer with Dynamic Classifier *NOx at furnace outlet
Slide 52
Enhancing Capacity – Empowering Nation Presentation on Supercritical Boilers 28 August 2012 Wind Box arrangement
Slide 53
Enhancing Capacity – Empowering Nation Presentation on Supercritical Boilers 28 August 2012 Upper SOFA on Walls
Lower SOFA in Corners Tilt +/-30 o Yaw +/-20 o Plan View for SOFA arrangement
Slide 54
Enhancing Capacity – Empowering Nation Presentation on Supercritical Boilers 28 August 2012 Materials in 660 MW
(Typical)
Slide 55
Enhancing Capacity – Empowering Nation Presentation on Supercritical Boilers 28 August 2012 Pressure part 660 MW
OTSC (Supercritical) 500 MW (Sub-critical) DrumNot applicableSA 299 (Carbon Steel) Vertical SeparatorSA 335 P91Not
applicable Water WallsSA 213 T22SA 210 Gr C EconomiserSA 210 Gr CSa 210 Gr C SHT91, TP 347HT11/T22/T91/ TP
347H RH T12/T23/T91/TP347H/ Super 304H T22, T91, TP 347H Material Comparison
Slide 56
Enhancing Capacity – Empowering Nation Presentation on Supercritical Boilers 28 August 2012 Boiler Parameters
DescriptionUnit 660 MW (Supercritical) 500 MW (Sub critical) Boiler Parameters-BMCR SH steam flowt/h21201625 SHO
pressurekg/cm 2 (a)256179 SHO/RHO temp. oCoC568/596540/540 Feed water temp. oCoC294254
Slide 57
Enhancing Capacity – Empowering Nation Presentation on Supercritical Boilers 28 August 2012 Description
(Source/Type) UnitDesign CoalWorst CoalBest Coal Proximate Analysis Fixed Carbon%26.0023.0032.00 Volatile
matter%19.0018.0022.00 Moisture%15.0017.0012.00 Ash%40.0042.0034.00 Total%100 HHVkcal/kg330028004000Ultimate Analysis Carbon%31.3728.9340.08 Hydrogen%3.402.403.50 Sulphur%0.400.50.36 Nitrogen%1.51.451.78
Oxygen(difference)%7.757.268.03 Moisture%15.017.012.0 Ash%40.042.034.0 Carbonates +
Phosphorous%0.580.460.25 Hard Grove Index555060 Fuel Analysis - Coal
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Enhancing Capacity – Empowering Nation Presentation on Supercritical Boilers 28 August 2012 General Arrangement of
Steam Generator – Plan
Slide 59
Enhancing Capacity – Empowering Nation Presentation on Supercritical Boilers 28 August 2012 ULTRA SUPER
CRITICAL TECHNOLOGY & ADVANCED ULTRA SUPER CRITICAL TECHNOLOGY
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Enhancing Capacity – Empowering Nation Presentation on Supercritical Boilers 28 August 2012 The Basic Heat Cycle
Sub-critical units: Main steam pressure < 221. 1 bar Super-critical units: Main steam pressure > 221. 1 bar Ultra-
supercritical units: Higher steam pressure and temperature than supercritical units Japan: Main steam pressure >242
Bar, or Steam temperature >593 ℃ Demark: Main steam pressure >275 Bar China: Main steam pressure >270 Bar
USA (EPRI) : Main steam temperature>593 ℃
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Enhancing Capacity – Empowering Nation Presentation on Supercritical Boilers 28 August 2012 Supercritical Plant with
steam pressure exceeding 225 kg/cm 2 is said “Supercritical” Ultra Super-Critical Supercritical plant with main steam
temperature 600 C is said “Ultra Super-Critical” Advanced Ultra Super-Critical Supercritical plant with main steam
temperature 700 C is “Advanced Ultra Super-Critical STEAM PARAMETERS
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Enhancing Capacity – Empowering Nation Presentation on Supercritical Boilers 28 August 2012 Evolution of Steam
Power Stations Efficiency Worldwide
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Enhancing Capacity – Empowering Nation Presentation on Supercritical Boilers 28 August 2012
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64 ADVANCED USC TECHNOLOGY 28 August 2012 EUROPEAN PERSPECTIVE AND ADVANCEMENT FOR ADVANCED
USC Pulverised Fuel-importance in World Power Generation Background of Development Of USC Plant with Steam
Temperature around 600 0 C Immediate Possibility of going to 650 0 C & 700 0 C with Nickel Alloy Best Strategy for
reduction of CO 2 Emission
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Enhancing Capacity – Empowering Nation Presentation on Supercritical Boilers 28 August 2012
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66 ADVANCED USC TECHNOLOGY 28 August 2012 AD700 TECHNOLOGY USC steam parameters-700 0 C and 350 bar
This can be achieved only by using Nickel based alloys In July 2005 :COMTES 700 testing most important components
– started operation in power plant Scholven in Gelchen-kirchen Completed in 2009. During operation phase, valuable
operational experience and processing technical knowledge were gained Welding of thick walled materials must be
improved More test needed for improved welding techniques for 617 or Alloy 740 or Nimonic 263
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67 ADVANCED USC TECHNOLOGY 28 August 2012 Japanese programme 2007 & 2008 (finding out and stabilising the
structure parameters affecting creep strength and degradation for accurately estimating 1,00,000 hr creep strength)
New alloys Fundamental studies on creep strength degradation assessment needed to ensure long term safe use.(FS-
>650 0 C AS ->700 0 C Ni-> 750 0 C) FS->100 MPa @ 650 0 C beyond 30000 hrs without any type IV degradation AS-
>generated by means of inter metallic compound precipitation strength grain boundary, strongest creep. R&D
PROGRAM FOR A-USC MATERIAL DEVELOPMENT WITH CREEP STRENGTH/DEGRADATION ASSESMENT STUDIES
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68 ADVANCED USC TECHNOLOGY 28 August 2012 USC POWER PLANT DEVELOPMENT IN JAPAN
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69 ADVANCED USC TECHNOLOGY 28 August 2012 METI/NEDO MATERIAL R&D PROGRAM
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70 ADVANCED USC TECHNOLOGY 28 August 2012 China first established use with parameters 600 0 C/25 MPa in 2006
TP347FGH & Super304H GH984, Nimonic 80A Ni-Cr-Co Inconel 740 studied with Special Metal Corp. USA for
steam temperature of 700 0 C STRUCTURAL STABILITY STUDY ON USE POWER PLANT ADVANCE HEAT RESISTANCE
STEELS AND ALLOYS IN CHINA
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71 ADVANCED USC TECHNOLOGY 28 August 2012 A cost effective CO 2 emission reduction option Engineering design
study(EPRI) Cost and performance of USC with conventional coal power plants Slightly more expensive Cost of avoided
CO 2 emission was less than $25 per metric ton of CO 2 capture and storage ECONOMIC ANALYSIS (EPRI)
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72 ADVANCED USC TECHNOLOGY 28 August 2012 STEAM SIDE OXIDATION FIRE SIDE CORROSION CREEP STRENTH
MATERIAL SELECTION
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73 ADVANCED USC TECHNOLOGY 28 August 2012 GKM TEST RIG
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74 ADVANCED USC TECHNOLOGY 28 August 2012 GKM TEST RIG
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75 ADVANCED USC TECHNOLOGY 28 August 2012 Strengthening and degradation of long term creep properties and
the relevant microstructural evolution in advance high Cr-Ferritic steels and Austenitic steels at high temperature GKM
TEST RIG Investigation of the long term operation behaviour tubes and forgings made of alloys for future high nuclear
power plants Qualification of key materials for 700°C fossil fuel power plant Demonstration of material performance
with special consideration of oxidation and corrosion behaviour Creep damage development Early detection of damage
in new material in connection with advance calculation tools for components ADVANCES IN MATERIAL TECHNOLOGY
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76 ADVANCED USC TECHNOLOGY 28 August 2012 ADVANCE CONCEPT FOR MAINTANENCE AND REPAIR FOR
COMPONENTS MADE OF NEW MATERIALS SH Test Track Creep Test Track (upto 630 °C Austenite steel & upto 725 °C
Ni based alloys) Monitoring devices for evolution of ongoing damage ADVANCES IN MATERIAL TECHNOLOGY
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77 ADVANCED USC TECHNOLOGY 28 August 2012 BY SPECIAL METALS CORPORATION Developed for operating with
700°C steam temperature and higher pressure. EUROPEAN TARGET Stress rupture requirement of 1,00,000 Hrs
rupture life at 750°C and 100 MPa stress. Metal loss of less than 2 mm in 2,00,000 hrs of Superheater service.
DISADVANTAGE OF INCONEL ALLOY 740 Thick section fabrication posed weldability challenges. Grain boundary
microfissuring occurred in the heat affected zone (HAZ) of the base metal. OPTIMIZATION OF INCONEL ALLOY 740
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78 28 August 2012 Advanced USC Presentation BHEL Development, Design & Manufacture of Power Cycle Equipment,
System Engineering, Test Facility and Evaluation NTPC Detailed Project Report Project Management Operation and
Maintenance Testing of Real Life Components in an existing plant IGCAR Advanced Design Analysis Materials
Development Manufacturing Technology Testing and Evaluation 800 MWe Advanced Ultra Super Critical Power Plant
MoU&Synergy Robust Roadmap for Success of Mission
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Enhancing Capacity – Empowering Nation Presentation on Supercritical Boilers 28 August 2012 Gearing-up to introduce
Advanced Ultra supercritical boilers (AUSC) AUSC Boilers (300 ata, 700 C / 700 C) will be developed based on
OTSC technology Test Facility (400 bar, 700 Deg. C) installed and tests are on to collect critical design data BHEL is
one among the Five MNC’s to have this facility Member of the National Technology Mission program to install AUSC
plant by 2017 Advanced Ultra Super Critical Plants
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Enhancing Capacity – Empowering Nation Presentation on Supercritical Boilers 28 August 2012 SUMMARY OTSC plants
offer better cycle efficiency Proven technologies leading to lower GHG emissions and lesser fuel burnt BHEL has the
technology for offering 660/700/800 MW supercritical units
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