Day 2 Session 5 - Jianxiong Mao CFB Boilers in China.pdf

8/18/2019 Day 2 Session 5 - Jianxiong Mao CFB Boilers in China.pdf

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CFB Boilers in ChinaCFB Boilers in China

JianxiongJianxiong MaoMao

Department of Thermal EngineeringDepartment of Thermal Engineering

Tsinghua University, Beijing, ChinaTsinghua University, Beijing, China

CLEANER COAL WORKSHOP AUGUST 19-21, 2008

HA LONG CITY, VIETNEM


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Advantages of CFB combustion Boiler Advantages of CFB combustion Boiler

• Clean coal combustion – Lower NO

X

emission

– Lower cost desulphurization during combustion

• Fuel flexibility

– Low grade coals, low volatile fuels: anthracite andpetroleum coke, coal mine mouth and coalwashery wastes, Biomass, municipal solid waste

• Lower Load rate• Ash can be used for cement

• Stability of operation


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Status of CFB Boilers in ChinaStatus of CFB Boilers in China

• Total number of CFB boilers in operationby the end of 2007 was 2637 units with

total installed capacity of about40,000MWe;

• Among the total 40,000MWe CFB boilers,

unit capacity between 100-200MWe wasover 100 units and unit capacity of300MWe was 8 units in operation;

• China has been the country with thelargest number and capacity of CFB

boilers in the world.


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Statistics of CFB Boilers in ChinaStatistics of CFB Boilers in China（20072007）

Capacity

t/h (MWe)

Number of Units of Total

(ordered, under construction

and in operation)

Number of units in

operation

25-50 1024 886

65-90 (25MWe) 1340 1159

100-130 (50MWe) 218 188

130-180 (75MWe) 86 69

200-280 (90MWe) 214 184

310-410 (100MWe) 55 46420-485 (135MWe) 184 96

500-700 (200MWe) 6 1

1000 (300MWe) 31 8

Total 3158 2637


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First 300MWe Anthracite CFB in BaimaFirst 300MWe Anthracite CFB in Baima

Power Plant in Sichuan ProvincePower Plant in Sichuan Province· Coal with volatile matter

content less than 10% is

defined as Anthracite;· Anthracite is diff icult to ignite,

stable and completecombustion by PC boiler, but

is a good fuel for CFB boilers;

· China is rich in anthracitereverse and production, it isused as steam coal for powergeneration. CFB is a excellentsolution for efficientanthracite combustion.


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Big Potential for Coal Mine andBig Potential for Coal Mine and

CoalCoal WasheryWashery Wastes Fired CFBWastes Fired CFB• Annual coal production in China has been

over 2500 mill ion tons in 2007, large amountof coal mine and coal washery wastes can beconverted into electricity through CFB powergeneration;

• Only in Shanxi Province, which is the largestcoal producer in China, 5,000-6,000MWe CFBpower plants burning coal mine and coalwashery wastes will be built during 2006-2010,which will consume 30-40 million tons of coalmine and coal washery wastes .


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Coal Mine and CoalCoal Mine and Coal WasheryWashery

Wastes Fired CFB Power PlantsWastes Fired CFB Power Plants· CFB boilers used for

coal mine and coalwashery wastes firedCFB power plants inoperation include

50MWe, 135MWe,150MWe and 300MWe,

· The largest 2 300MWe

coal nine waste CFBplant wil l be in operationin August 2008 in ShanxiProvince.


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44 150MWe Reheat CFB Burning Waste Anthracite150MWe Reheat CFB Burning Waste Anthracite

CamphaCampha

Thermal Power Plant in VietnamThermal Power Plant in Vietnam

Campha is the Largestongoing CFB Power Plant in

Vietnam· Location: Campha, Vietnam

· EPC Contractor : Harbin Power

Engineering (HPE) , China· Subcontractor to HPE Providing

Engineering Package and SiteService: Foster Wheeler

· Start-Up Year : 2009/2010· Capacity: 4 150MWe in 2 phases

· Fuel: 80% Waste anthracite and

20% anthracite washery slurry


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CamphaCampha Thermal Power Plant Under ConstructionThermal Power Plant Under Construction


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500 tons/day municipal solid waste (MSW)CFB

Power Plant Developed by Tsinghua University


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The Sources of CFB Boiler Technology in ChinaThe Sources of CFB Boiler Technology in China

• Local CFB Technologies developed by: – Tsinghua University

– Thermal Engineering Physics Institute

– Thermal Power Research Institute

• Imported Sub-critical CFB Technology from: – Foster Wheeler to:

• Dongfang Boiler Company:100MWe CFB• Wuxi Boiler Company:150-300MWe CFB

– EVT to:

• Harbin Boiler Company: 135MWe CFB

– CE to:• Shanghai Boiler Company: 135 MWe CFB

– Alstom to:

• Harbin/Dongfang/Shanghai Boiler companies: 300MWe CFB

• Redevelopment of imported CFB technologies


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200MWe CFB Boiler Jointly Developed by200MWe CFB Boiler Jointly Developed by

Tsinghua University and Harbin BoilerTsinghua University and Harbin Boiler Co.LtdCo.Ltd


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Concept Design of 300MWe CFB Boiler

Developed by Tsinghua UniversityFeatures of concept design

of 300MWe CFB boiler:·Suitable for burning Chinese coal(high ash and sulfur content and

low heating value);·Three(3) Cyclones without externalheat exchanger (EHE);

·Parallel back pass with damperreheat temperature control;

·Tubular air heater for less air

leakage.


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Introduced 200Introduced 200--300MWe CFB300MWe CFB

Technology from Foster Wheeler Technology from Foster Wheeler

FB190


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Introduced 200Introduced 200--300MWe CFB300MWe CFB

Technology fromTechnology from Alstom Alstom


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Why We Need Supercritical CFB ?Why We Need Supercritical CFB ?Performance Comparison Between Different Type of Thermal Power GPerformance Comparison Between Different Type of Thermal Power Generation Unitseneration Units

Types of units Sub-critical

2 600MWe

Supercritical

2 600MWe

Ultra-supercritical

2 1000MWe

Steam parameters 16.7MPa/

538/538oC

24.5MPa/

538/566oC

24.5MPa/

566/566oC

27.5MPa/

600/600oC

Heat rate of Steam

turbine(Kcal/kwh)

1877 1830 1780 1772

Net efficiency

(％

)

39 42.91 43.63 45.01

Coal consumption

(gce/kwh)

315 286 282 272.9

Reduction of coal

consumption

(gce/kwh)

Base 29 33 42


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600MWe Supercritical CFB in China600MWe Supercritical CFB in China

• Development program of 600MWe supercritical CFB

boiler in China is a sub-project of “ 863” Program (High

Technology Development Program in China funded byMOST ), which is jointly developed by Tsinghua and

Harbin Boiler Co. Ltd. Another two major boiler

companies- Dongfang and Shanghai are also to jointhis development.

• First 600MWe supercrit ical CFB util ity boiler burning

anthracite will be built at Baima Power Plant.Construction of this project will start by the end of

2008


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Development of 600MWe Supercritical CFB in ChinaDevelopment of 600MWe Supercritical CFB in China

• Concept design of 600MWe

supercritical CFB boiler has

been completed.• Considering low and even

heat flux and temperature in

CFB furnace, smooth tubecan be used instead of rifled

tube in furnace.

• A demonstration project of

600MWe supercritical CFB

power plant will be built in

2008 at Baima Power Plant.


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Arrangement of 600MWesupercritical CFB Arrangement of 600MWesupercritical CFB

Boiler ofBoiler of TsinghuaTsinghua’’ss DesignDesign


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Concept Design of 600MWe Supercritical CFB Boiler JointlyConcept Design of 600MWe Supercritical CFB Boiler Jointly

Developed by Tsinghua University and Harbin Boiler CompanyDeveloped by Tsinghua University and Harbin Boiler Company

• Design features:

• Pants leg furnace designbased on introduced

design from Alstom;• Combined ignit ion system

both under bed and abovebed;

• Vertical tube water wall;

• 6 cyclones with 6 externalheat exchangers (EHEs);

• Bottom ash drained fromboth two side walls

through rol ler type ashcooler;

• 4 regenerated air heaterswith 4 sectors


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Basic Design Performances ofBasic Design Performances of 600MWe600MWe

CFB Boiler Jointly Developed byCFB Boiler Jointly Developed by

Tsinghua University and Harbin Boiler CompanyTsinghua University and Harbin Boiler Company

1. BMCR = 1900t/h

2. SH steam pressure=25.4MPa3. SH steam temperature =571℃ 5℃

4. RH steam temperature = 569℃ 5℃

5. Boiler efficiency = 91.9％（LHV）6. Lowest boiler load without oil supply = 30％BMCR

7. SO2emissions < 400mg/Nm3

8. NOx emissions≤

200 mg/Nm3

9. Removed bottom ash temperature at the outlet of

ash cooler ≤150℃


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Roller Type Ash Cooler for 300/600 MWe

CFB Boilers Developed in China


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Roller Type Ash Cooler for

300/600 MWe CFB Boilers


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Concept Design of 600MWe Supercritical CFBConcept Design of 600MWe Supercritical CFB

Boiler Developed by Dong Fang Boiler CompanyBoiler Developed by Dong Fang Boiler Company

• Design features:• Pants leg furnace design based

on introduced design from Alstom;

• Coal feed through loop sealsystem;

• Combined ignition system bothunder bad and above bed;

• 6 cyclones with 6 external heatexchangers (EHEs);

• Bottom ash drained from bothtwo side walls through rollertype ash cooler;

• 4 regenerated air heaters with 4

sectors


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Concept Design of 600MWe Supercritical CFB Boiler Jointly DeveloConcept Design of 600MWe Supercrit ical CFB Boiler Jointly Developed byped by

Thermal Engineering Physics Institute and Shanghai Boiler CompThermal Engineering Physics Institute and Shanghai Boiler Companyany

• Design features:

• Single furnace design withoutpants leg;

• Vertical tube design withpartial ri fle tube ;

• Mass flow rate is 1400kg/m2

s• 6 cyclones with 6 external

heat exchangers (EHEs);

• Bottom ash drained from both

two side walls through rollertype ash cooler;


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ConclusionsConclusions

• CFB as a clean coal technology is very important forthe countries such as China where coal is the

dominant factor in energy structure;• China has been the country with the largest number

and capacity of CFB boilers;

• CFB has been a mature technology as utility boiler forpower generation with unique advantages vs PCboilers such as low emissions and fuel flexibility;

• CFB is specially suitable for burning anthracite, lowgrade coal, biomass and municipal solid waste forpower generation.


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Thank you

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Day 2 Session 5 - Jianxiong Mao CFB Boilers in China.pdf

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