8/12/2019 4- CFBC

1/21

Presentation on CFBC Technology

by

CETHAR VESSELS (P) LTD

8/12/2019 4- CFBC

2/21

COMPARISON WITH OTHER TECHNOLOGIES

PULVERIZED FIRING FLUIDIIZEDBED FIRING

VELOCITY 2-3 m/ sec 5 10 m/sec 1.5 3 m/sec 4.5-6.5 m/sec

FUEL FEED SIZE 37 mm X 0 200 microns 6 mm 12 mm X 0

FURNACE TEMP. 1150- 1450 C 1250- 1600 C 850- 950 C 850- 950 C

COMBUSTIONEFFICIENCY %

85-90 99 95-96 98-99

GAS

FUEL

AIR ASH

STROKER FIRING

(FIXED BED)

ASH

(ENTRAINED BED)

GAS

AIR

FUEL

ASH

FUEL & SORBENT

AIR

GAS

BFB

ASHAIR

FUEL & SORBENT

AIR

CFBGAS

8/12/2019 4- CFBC

3/21

Typical CFBC Boiler

Typical CFBC Boiler

8/12/2019 4- CFBC

4/21

Design Features of CVPLs CFBC Boiler

Gas tight Water cooled membrane wallconstruction for furnace

Lower Combustor with Refractory lining

Water cooled hot cyclone separator with insiderefractory lining

Entire recirculation loop i.e., Return leg, LoopSeal & Down Chute are made of membrane Panel

with refractory lining

Elimination of maintenance prone expansionjoints at the inlet of Cyclone, inlet & outlet ofLoop Seal

8/12/2019 4- CFBC

5/21

Design Features of CVPLs CFBC Boiler

The Convective heat transfer banks such as Superheater & Economizer are located in downstreamof Cyclone separator to avoid erosion

Wing wall heat transfer surface is provided in theupper furnace to balance the heat pick-up

between Evaporator and Super heater, if required

Specially designed non-mechanical Loop Seal

Non-mechanical flow control device for regulation

of bed ash removal

8/12/2019 4- CFBC

6/21

ADVANTAGES OF CFBC OVER AFBC Higher boiler efficiency

Higher combustion efficiency Compact arrangement Adaptability for high capacity utility boilers Suitable for firing low grade fuels Effective sulphur retention

Eco-friendly with low air pollution Less fuel feed points results in simple

arrangement Fuel flexibility Better Turndown ratio No Bed Coil and Bed Super heater Coil and hence

Less Maintenance and higher availability.

8/12/2019 4- CFBC

7/21

ADVANTAGES OF CFBC OVER PC FIRED

BOILER

High fuel flexibility

Accepts low grade fuel with high ash content

Accepts higher fuel size (up to 12 mm)

No milling plant and related maintenance

Effective Sulphur retention (up to 97%)withlimestone addition under optimum condition.

No FGD for Sulphur retention

Low Nox emission due to low furnace

temperature and staged combustion Oil firing is required only for start-up

8/12/2019 4- CFBC

8/21

SOx AND NOx CONTROL

Lower Sox emission due to Higher recirculation of sorbant Higher volume of fluidized bed Higher turbulence in the bed Finer sorbant particle Better interaction of sorbant with air /

sulphur

Lower Nox emission due to - Low furnace operating temperature

Staged combustion(Primary and Secondary air introduced in

combustor at different elevation)

8/12/2019 4- CFBC

9/21

Grid Nozzles

8/12/2019 4- CFBC

10/21

Refractory Lining Protects Furnace

Separator Tubes

Thin Studded RefractoryLining Provides:

Reduced WeightReduced Maintenance

Studs Stabilize RefractoryCooler Refractory Reduces Erosion

Rates

8/12/2019 4- CFBC

11/21

Furnace Tube Design Eliminates Erosion

8/12/2019 4- CFBC

12/21

Vertical Super Heater/ Evaporator Panels

Resist Erosion

8/12/2019 4- CFBC

13/21

8/12/2019 4- CFBC

14/21

% MCR LOAD vs SH STEAM TEMP.

440450

460

470

480

490

500

510

520

530

540

30 40 50 60 70 80 90 100

% MCR LOAD

SH

STEAMT

EM

P.DEG.

8/12/2019 4- CFBC

15/21

8/12/2019 4- CFBC

16/21

CFBC - can accommodate a wide Range of Fuel Properties

Range of Fuel Properties for CFBs

Moisture Up to 60 % ( Brown coal, Peat, Sludge)

Ash Up to 76 % ( Waste Anthracite )

Sulphur Up to 10 % ( Waste Bituminous Petroleumcoke )

Volatile Down to 1% ( CHAR )

HHV Down to 1400 Kcal/Kg ( CHAR )

8/12/2019 4- CFBC

17/21

CFBC - REFERENCE LIST

S.No CUSTOMER NAME CAPACITYKG/HR

PRESSUREKG/SQ.CM

STEAMTEMP.DEG.C

FUELS STATUS

01. SHRI RAMRUPAI BALAJISTEELS LTD, DURGAPUR,W.B.

170,000 86 515+/-5 Char(GCV-1700Kcal/Kg with 70%Ash) + BF Gas.

U.E

02. ORIENT CEMENT, DEVAPUR,ANDHRA PRADESH

114,000 88 520 +/- 5 Coal MiddlingDry cake + Rice Husk /Wood Chips.

U.E

03. ORIENT CEMENT, DEVAPUR,ANDHRA PRADESH

114,000 88 520 +/- 5 Coal MiddlingDry cake + Rice Husk /Wood Chips.

U.E

04. SAKTHI SUGARS LTD,TAMILNADU.

110,000 108 510 +/- 5 Bagasse + Coal +Distillery effluent.

U.E

05. ACC LIMITED, WADI 110,000 67 485+/-5 Coal Middling & Coal U.E

06. ACC LIMITED, WADI 110,000 67 485+/-5 Coal Middling & Coal U.E

07. BINANI CEMENT LTD,

SHIROHI, RAJASTHAN.

92,000 87 510+/-4 Barmer Lignite

Pet coke, Indian CoalImported Coal

U.E

U.EUNDER EXECUTION

8/12/2019 4- CFBC

18/21

CFBC - REFERENCE LIST

S.No CUSTOMER NAME CAPACITYKG/HR

PRESSUREKG/SQ.CM

STEAMTEMP.

DEG.C

FUELS STATUS

08. BINANI CEMENT LTD,SHIROHI, RAJASTHAN.

92,000 87 510+/-4 Barmer LignitePetcoke, Indian CoalImported Coal

U.E

09. SHREE CEMENTS LTD, BEWAR,RAJASTHAN.

85,000 88 520+/-5 PetcokeResidue (Fly ash fromAFBC)

U.E

10. SHRI RAMRUPAI BALAJISTEELS LTD, DURGAPUR,W.B.

85,000 86 515+/-5 Char(GCV-1700Kcal/Kg with 70%Ash) + BF Gas.

U.E

11. ACC LTD, BARGARH. 67,000 67 485+/-5 Coal Middling U.E

12. ACC LTD, BARGARH. 67,000 67 485+/-5 Coal Middling U.E

U.EUNDER EXECUTION

8/12/2019 4- CFBC

19/21

FUELS CONSIDERED FOR CETHARs CFBC

100 % Char (GCV =1750 Kcal/kg)

100% Petcoke (GCV=7850 Kcal/kg &

10% sulphur)

100% Washery rejects ( ash=70%)100% Lignite ( M=50% max)

100% Indian Coal

100% Imported Coal

8/12/2019 4- CFBC

20/21

OTHER FUELS (PARTIAL)

Bagasse

Fly ash residue from BFBC boilers

Distillery Effluent

Blast furnace gas

Wood chips

Paper Sludge

Rice Husk

8/12/2019 4- CFBC

21/21

Thank You