CFB Boilers in ChinaCFB Boilers in China

JianxiongJianxiong MaoMaoDepartment of Thermal EngineeringDepartment of Thermal EngineeringTsinghua University, Beijing, ChinaTsinghua University, Beijing, China

CLEANER COAL WORKSHOPAUGUST 19-21, 2008

HA LONG CITY, VIETNEM

Advantages of CFB combustion BoilerAdvantages of CFB combustion Boiler

Clean coal combustion Lower NOX emission Lower cost desulphurization during combustion

Fuel flexibility Low grade coals, low volatile fuels: anthracite and

petroleum coke, coal mine mouth and coal washery wastes, Biomass, municipal solid waste

Lower Load rate Ash can be used for cement Stability of operation

Status of CFB Boilers in ChinaStatus of CFB Boilers in China Total number of CFB boilers in operation

by the end of 2007 was 2637 units with total installed capacity of about 40,000MWe;

Among the total 40,000MWe CFB boilers, unit capacity between 100-200MWe was over 100 units and unit capacity of 300MWe was 8 units in operation;

China has been the country with the largest number and capacity of CFB boilers in the world.

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 88665-90 (25MWe) 1340 1159100-130 (50MWe) 218 188130-180 (75MWe) 86 69200-280 (90MWe) 214 184310-410 (100MWe) 55 46420-485 (135MWe) 184 96500-700 (200MWe) 6 11000 (300MWe) 31 8Total 3158 2637

First 300MWe Anthracite CFB in Baima First 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 difficult to ignite, stable and complete combustion by PC boiler, but is a good fuel for CFB boilers;

China is rich in anthracite reverse and production, it is used as steam coal for power generation. CFB is a excellent solution for efficient anthracite combustion.

Big Potential for Coal Mine and Big Potential for Coal Mine and Coal Coal WasheryWashery Wastes Fired CFBWastes Fired CFB

Annual coal production in China has been over 2500 million tons in 2007, large amount of coal mine and coal washery wastes can be converted into electricity through CFB power generation;

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

Coal Mine and Coal Coal Mine and Coal WasheryWashery Wastes Fired CFB Power PlantsWastes Fired CFB Power Plants

CFB boilers used for coal mine and coal washery wastes fired CFB power plants in operation include 50MWe, 135MWe, 150MWe and 300MWe,

The largest 2300MWe coal nine waste CFB plant will be in operation in August 2008 in Shanxi Province.

44150MWe Reheat CFB Burning Waste Anthracite150MWe Reheat CFB Burning Waste Anthracite CamphaCampha Thermal Power Plant in VietnamThermal Power Plant in Vietnam

Campha is the Largest ongoing CFB Power Plant in Vietnam

Location: Campha, Vietnam EPC Contractor: Harbin Power

Engineering (HPE) , China Subcontractor to HPE Providing

Engineering Package and Site Service: Foster Wheeler

Start-Up Year: 2009/2010 Capacity: 4150MWe in 2 phases Fuel: 80% Waste anthracite and

20% anthracite washery slurry

CamphaCampha Thermal Power Plant Under ConstructionThermal Power Plant Under Construction

500 tons/day municipal solid waste (MSW)CFB

Power Plant Developed by Tsinghua University

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

200MWe CFB Boiler Jointly Developed by 200MWe CFB Boiler Jointly Developed by Tsinghua University and Harbin Boiler Tsinghua University and Harbin Boiler Co.LtdCo.Ltd

Concept Design of 300MWe CFB Boiler Developed by Tsinghua University

Features 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 external heat exchanger (EHE); Parallel back pass with damper reheat temperature control; Tubular air heater for less air leakage.

Introduced 200Introduced 200--300MWe CFB 300MWe CFB Technology from Foster WheelerTechnology from Foster Wheeler

FB190

Introduced 200Introduced 200--300MWe CFB 300MWe CFB Technology from Technology from AlstomAlstom

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-critical2600MWe

Supercritical 2600MWe

Ultra-supercritical 21000MWe

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

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 by MOST ), which is jointly developed by Tsinghua and Harbin Boiler Co. Ltd. Another two major boiler companies- Dongfang and Shanghai are also to join this development.

First 600MWe supercritical CFB utility boiler burning anthracite will be built at Baima Power Plant. Construction of this project will start by the end of 2008

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 tube can 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.

Arrangement of 600MWesupercritical CFB Arrangement of 600MWesupercritical CFB Boiler of Boiler of TsinghuaTsinghuass DesignDesign

Concept Design of 600MWe Supercritical CFB Boiler Jointly Concept 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 design

based on introduced design from Alstom;

Combined ignition system both under bed and above bed;

Vertical tube water wall; 6 cyclones with 6 external

heat exchangers (EHEs); Bottom ash drained from

both two side walls through roller type ash cooler;

4 regenerated air heaters with 4 sectors

Basic Design Performances of Basic Design Performances of 600MWe 600MWe CFB Boiler Jointly Developed by CFB 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 =57154. RH steam temperature = 56955. Boiler efficiency = 91.9LHV6. Lowest boiler load without oil supply = 30BMCR 7. SO2 emissions < 400mg/Nm38. NOx emissions

200 mg/Nm3

9. Removed bottom ash temperature at the outlet of ash cooler 150

Roller Type Ash Cooler for 300/600 MWeCFB Boilers Developed in China

Roller Type Ash Cooler for 300/600 MWe CFB Boilers

Concept Design of 600MWe Supercritical CFB Concept 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 seal system;

Combined ignition system both under bad and above bed;

6 cyclones with 6 external heat exchangers (EHEs);

Bottom ash drained from both two side walls through roller type ash cooler;

4 regenerated air heaters with 4 sectors

Concept Design of 600MWe Supercritical CFB Boiler Jointly DeveloConcept Design of 600MWe Supercritical CFB Boiler Jointly Developed by ped by Thermal Engineering Physics Institute and Shanghai Boiler CompThermal Engineering Physics Institute and Shanghai Boiler Companyany

Design features: Single furnace design without

pants leg; Vertical tube design with

partial rifle tube ; Mass flow rate is 1400kg/m2s 6 cyclones with 6 external

heat exchangers (EHEs); Bottom ash drained from both

two side walls through roller type ash cooler;

ConclusionsConclusions CFB as a clean coal technology is very important for

the 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 for power generation with unique advantages vs PC boilers such as low emissions and fuel flexibility;

CFB is specially suitable for burning anthracite, low grade coal, biomass and municipal solid waste for power generation.

Thank you

CFB Boilers in ChinaAdvantages of CFB combustion BoilerStatus of CFB Boilers in ChinaStatistics of CFB Boilers in China2007First 300MWe Anthracite CFB in Baima Power Plant in Sichuan ProvinceBig Potential for Coal Mine and Coal Washery Wastes Fired CFB Coal Mine and Coal Washery Wastes Fired CFB Power Plants4150MWe Reheat CFB Burning Waste AnthraciteCampha Thermal Power Plant in VietnamCampha Thermal Power Plant Under ConstructionSlide Number 10The Sources of CFB Boiler Technology in China 200MWe CFB Boiler Jointly Developed by Tsinghua University and Harbin Boiler Co.Ltd Slide Number 13Introduced 200-300MWe CFB Technology from Foster WheelerIntroduced 200-300MWe CFB Technology from AlstomWhy We Need Supercritical CFB ?Performance Comparison Between Different Type of Thermal Power Generation Units600MWe Supercritical CFB in ChinaDevelopment of 600MWe Supercritical CFB in ChinaArrangement of 600MWesupercritical CFB Boiler of Tsinghuas DesignConcept Design of 600MWe Supercritical CFB Boiler Jointly Developed by Tsinghua University and Harbin Boiler CompanyBasic Design Performances of 600MWe CFB Boiler Jointly Developed by Tsinghua University and Harbin Boiler CompanySlide Number 22Roller Type Ash Cooler for 300/600 MWe CFB BoilersConcept Design of 600MWe Supercritical CFB Boiler Developed by Dong Fang Boiler CompanyConcept Design of 600MWe Supercritical CFB Boiler Jointly Developed by Thermal Engineering Physics Institute and Shanghai Boiler CompanyConclusionsSlide Number 27