bhel supercritical

7/31/2019 BHEL supercritical

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May 24, 2012 1

LAYOUT ARRANGEMENT OFSUPER CRITICAL BOILER


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May 24, 2012 2

thermodynamic diagram forsupercritical plant


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The Water and Steam FlowDiagram


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Supercritical Boiler FlowChart


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Cycle of Supercritical PowerPlant


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ZR : Aux. Relief VV, WR : Water Relief VV

LL : Level Control VV, UG : Recirculation VV


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General Arrangement of Boiler Component


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May 24, 2012 11

Straight Tube Wall vs. Spiral Tube Wall

Spiral Wall Furnace - Impact on Tube Numbers vs.

Straight Wall

Unit Size 500 MW, Conventional Vertical Furnace Wall

Designs

Unit Size 500 MW, Spiral-Wound Furnace may be

Necessary(Fuel will be Final Determinant)

Basic Principle of Spiral Wall

furnace

Sliding Pressure SupercriticalDesign

Spiral Angle

Spiral Angle

Spiral Tube

PitchSpiral Angle

Vertical

Tube

Pitch

Spiral Angle

Spiral Tube

Pitch

Vertical

Tube

Pitch


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Design TypesDesign Types

NATURALSTEAM DRUM

FURNACE

WALLS

ECON.

CONTROLLEDTO SUPERHEATER

CIRC.PUMP

SEPARATOR

CIRC.

PUMP

ECON.

DISTRIB.

HEADER

ONCE THROUGH

Natural circulation - well suited for < 145 barcycles

Controlled circulation - optimum solution forreliable high-pressure subcritical operation

Once-through technology Suitable for sub and supercritical cycles Both spiral-wall and vertical-wall

arrangements available depending uponcapacity and fuel


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May 24, 2012 14

Advanced Sliding Pressure Supercritical Design

WATERW

ALLINLETPRESSURE

BOILER LOAD, % MCR

PRESSURE VS LOAD

SubcriticalPressure Regime

SupercriticalPressure Regime

WaterwallPressure

Turbine ThrottlePressure

0 20 40 60 80 100

Sliding Pressure Supercritical DesignSliding Pressure Supercritical Design


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May 24, 2012 15

Sliding Pressure SupercriticalSliding Pressure SupercriticalDesignDesign

Circulation and Start Up SystemsCirculation and Start Up Systems

Spiral Wall Boiler Design

Vertical Wall Boiler DesignDetails

Design Principles

Test Data

Start up Systems

Pumped and Drain Systems

Components

Performance and Advantages of Pumped Start upSystem


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May 24, 2012 16

Evaluation of Heat

Transfer at Tube

Inside Wall is Key to

Design of SPSC

Boilers

Evaluation of HeatTransfer at Tube

Inside Wall is Key to

Design of SPSC

Boilers

Factors Greatly

Affecting Heat

Transfer at Tube

Inside Wall:

Rifled Tubing

Mass Velocity

Factors GreatlyAffecting Heat

Transfer at Tube

Inside Wall:

Rifled Tubing

Mass Velocity

Determination of Furnace Wall Tube Metal Temperature

Vertical Wall SPSC BoilerVertical Wall SPSC Boiler


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May 24, 2012 17

Q u a l i t y

M i n i m u m S a f e t y M a r g i n

~ %1 1

N o r m a l C o n d i t i o n s

Elevation

S m o o t h T u b i n g

%1 1

Gen

era

ted

Qua

lity

Q u a l i t y

M i n i m u m S a f e t y M a r g

~ %1 1

Elevation

R i f l e d T u b i n g

%1 1

Generated

Quality

AllowableQuality

D N B

R e g i o n

Allow

able

Quality

D N B

R e g i o n

Controlled Circulation BoilerControlled Circulation Boiler


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Circulation and DNB AnalysisCirculation and DNB Analysis

Normal Conditions in a Once Through Boiler

100%SUPERHEAT

FURNACE WALL OUTLET

Normal Conditions in Subcritical Boiler


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May 24, 2012 19Q/A (Kw/m1)

Critical Q/A (Kw/m1)

Boiler Q/A (Kw/m1)

X= .11

X= .00

X= .00

X= .00

Subcritical Boiler

BoilerHeigh

t

. Margin111

X= Steam Quality Fraction

Top of Boiler


Safety Margin Of Subcritical Boiler

Q/A Critical

Q/A Boiler >1.25


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Conditions of Supercritical Once Through Boiler

Q/A (Kw/m1)

Critical Q/A (Kw/m1)

Boiler Q/A (Kw/m1)

X= .11

X= .11

X= .00

X= .00

X= .11

X= .11

X= .00

Subcritical Boiler

Once Through

Boiler

BoilerHeight

Superheat


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Midwall Temperature vs. Mass Velocity

Smooth Tube

Tfluid111oCP= . Mpa000

11

000

000

000000

000000

11000

000

111

111

111

111

111

111

111

111

111

111

1111 1111 1111 1111 1111 1111 1111 1111 1111 1111 1111

Mass Velocity (Kg/m1-sec)

Mid

wallTemperature(oC

)

111

111

111

Q/A (Kw/m )1

Spiral Boiler TechnologySpiral Boiler Technology

Mass Velocity studyMass Velocity study

41 mm O.D. x x 6.4 mwtSA 213 T22


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Midwall Temperature vs. Mass Velocit

Rifled Tube

Tfluid

C111

P= . Mpa000

11

000

000

00011

1111

000

11

111

000

000

000

000

111

000

000

000

111

111

1111 1111 1111 1111 1111 1111 1111 1111 1111 1111 1111

Mass Velocity (kg/m -sec1

M

idwallTemperature

111

111

111

Q/A (kw/m 1


Mass Velocity studyMass Velocity study

41 mm O.D. x x 6.4 mwtSA 213 T22


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May 24, 2012 23

HearAbsorption

in% 140

120

100

80

60

Left Side WallRear WallRight Side WallFront Wall

Left Side Wall

RearWall

Right Side Wall

FrontWall

100 % Load Spiral Waterwall

Central Fireball


Number of Turns StudyNumber of Turns Study


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100 % Load Spiral Waterwall

Fireball Shift to Corner

HearAbsorption

in% 140

120

100

80

60FW RSW RW LSW

Left Side WallRear WallRight Side WallFront Wall

Left Side Wall

RearWall

Right Side Wall

FrontWall


Number of Turns StudyNumber of Turns Study


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Start-up System with RecirculationStart-up System with Recirculation


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Start-up System with RecirculationStart-up System with Recirculation


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Simplified Drain Discharge SystemSimplified Drain Discharge System

SH

WW

ECO

HPH

HWL

to condenser

deaerator

WLBFP

flash

tank


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Supercritical Technology

Better PlantEfficiencies

Lower PlantOperating Costs

Lower Emission

Levels with LowerCoal Consumption

Supercritical Cycle Advantages

-10

-9

-8

-7

-6

-5-4

-3

-2

-1

0

1800 2400 3500 4500

1000/1000F

1000/1000/1000F

1100/1100/1100F

Double Reheat

Double Reheat

Single Reheat

Throttle Steam Pressure, psig

Effect of Steam Conditions on Heat Rate

RelativeNet

Heat

Rate,

%

S iti l T h l


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Supercritical TechnologyDesigns to meet every application

Two-pass design

Tower design

World leader ~ 100 supercritical units

Design options to meet fuel specificatioand customer preferences

Design options to meet fuel specificatioand customer preferences

Spiral

woundStraight

Wall


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Steam Power Plant Technology Trends

50s 60s 70s 80s 90s 00s 10s

10

8

6

4

2

0

Heat Rate

Heat Rate

2400/1005/1005

3500/1005/1050 (psi/F/F)

3600/1050/1085

4050/1075/1100

4050/1100/1150

4050/1160/1200

5450/1290/1325/1325

Technologymaturity

.

15

[%]

Advanced SteamConditions -higher

Temperatures/Pressures

Recent ContractsCO- 2004 China Waigaoqiao 2x900 MW, 4078/1006/1056CO- 2002 Germany Niederaussem 1000MW, 3976/1076/1112CO-2002 Korea Yunghung 2x800 MW,.3627/1056/1056CO-2001 Greece Florina 330 MW, 3572/1009/1008CO- 2000 Taiwan Mai Liao 2x600MW, 3844/1006/1056

SubcriticalMature Technology

SupercriticalMature Technology

Advanced Sliding Pressure


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Advanced Sliding PressureSupercritical Design

WATERWALLINLETPRESSURE

BOILER LOAD, % MCR

PRESSURE VS LOAD

SubcriticalPressure Regime

SupercriticalPressure Regime

WaterwallPressure

Turbine ThrottlePressure

0 20 40 60 80 100


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Spiral Waterwall Tubing

Lateral Heat Flux Profile

S i l W ll Slidi P


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Spiral Furnace

Windbox Panel

Spiral Wall Sliding PressureSupercritical Design


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THANK YOU

bhel supercritical

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