Oxidation Blower for FGD system

1. Oxidation Blower for FGD System

2. MOEFCC - Notification on 7.12.15
Pollutants TPPs ( units) installed
before 31st December, 2003*
TPPs ( units) installed
after 1st January,2004
upto 31st December, 2016*
TPPs ( units) to be
installed from
1st January, 2017**
Particulate Matter
(PM)
100 mg/Nm3 50 mg/Nm3 30 mg/Nm3
Sulphur Dioxide
(SO2)
600 mg/Nm3 (Units < 500MW)
200 mg/Nm3 (Units >=
500MW)
600 mg/Nm3 (Units < 500MW)
200 mg/Nm3 (Units >=
500MW)
100 mg/Nm3
Oxides of Nitrogen
(NOx)
600 mg/Nm3 300 mg/Nm3 100 mg/Nm3
Mercury ( Hg) 0.03 mg/Nm3(for units having
capacity of 500MW)
0.03 mg/Nm3 0.03 mg/Nm3
*TPPs (units) shall meet the limits within two years from date of publication of this notification.
**Includes all the TPPs (units) which have been accorded environmental clearance and are under construction.

3. FGD
The Flue Gas Desulphurization (FGD) is a
process of removal of sulphur dioxide (SO2)
from the flue gas

4. Need for FGD
 Combustion of fuel having sulphur results in SO2
Emission
 95 – 96 % of sulphur is converted into SO2
 Sulphur content in Indian coal ranges from 0.4 to 0.5 %
and in imported coal it is more than 0.6 %.
 Coal with 0.5 % sulphur, generates SO2 of range 1200 –
1600 mg/Nm3
 SO2 emission results in Acid-rain, corrosion of buildings
& structures and affect human health

5. Types of FGD
 Wet Lime/Limestone FGD
 Seawater FGD
 Dry FGD ( SDA , CDS)

6. FGD Technology
 BHEL has signed a TCA with M/s MHPS for Wet FGD
technology in April 2013.

7. ID fan
Absorber
Booster Fan
Gas to Gas
Heater (GGH)
Stack

8. E ll i r n i n a t o r
O x i d a t i o n A i r B l aow e r
L i m e s t o n e
S i l o
V V e t B a l l
M i l l
a s s D a m p e r
S t a c k
S l u r r y R e c i rc u l a t i o n
P u m p s
A s h P o n d
P e
r i m a r y
H y c
d rO<
c y c l o n e
S e c o n d a r y
H y d r o c y c
l o n e
L i m e s t . o n e
S l u r r y
Stao r a g e T a n k L i m e s t . o n e
S Iu r r y
P u m p s
F i lt r a t e W
a t e r T a n k
Wet Limestone based FGD

9. Critical Equipment of FGD system
 Booster Fan
 Gas to Gas Heater (GGH)
 Slurry Recirculation pump
 Wet Ball Mill
 Gypsum de-watering system
 Oxidation Blower
 Mist eliminator
 Agitator

10. Why Oxidation Blower is required
 Oxidation process plays vital role in achieving desired
purity of gypsum
 Gypsum purity also depends on flue gas composition,
dust content, purity of limestone etc.
 For a given conditions, bowing sufficient oxidation air with
proper distribution helps in converting majority of sulphite
(SO3) into sulphate (SO4)

11. Oxidation Blower quantity
 Number of oxidation blowers depends on number of
Absorbers
 Each Absorber shall be provided with One working and
One standby blower

12. Oxidation Blower / Compressor
 Depending on the pressure ratio, Compressor / Blower
terminology will be used
 When used for low pressure applications - it is called
Blower
 When used for high pressure applications - it is called
compressor

13. Type Blowers used in FGD
 Single stage, integrally geared, single or dual vane
centrifugal type
 Positive displacement type with / without VFD. VFD is
required when flow control is required
 Multistage centrifugal compressor with / without VFD
 Reference is required for flow and head

14. Single stage, Integrally Geared Blower

15. Positive displacement Blower

16. BHEL make Oxidation Blower

17. Typical Blower Parameters
SUCTION PRESSURE, KG/CM2A Atmosphere
SUCTION TEMPERATURE, °C Ambient
FLOW, NM3/HR 5000 - 16500
MOLECULAR WEIGHT Air (28.97)
DISCHARGE PRESSURE, KG/CM2A 1.5 - 2
DISCHARGE TEMPERATURE, °C 130-150
MODELS BCL 502 / BCL 402

18. BHEL make Blower accepted for:
 Mahagenco – 1X660 MW Bhusawal
 TSGENCO – 1X800 MW Kothagudem
 TSGENCO – 4X270 MW Bhadradri
 TSGENCO – 5X800 MW Yadadri

19. Major items of Blower Package
 Suction filter and silencer
 Suction throttle valve
 Blower
 Discharge silencer
 Blow-off system
 Quenching system
 Lube Oil System
 Gear Box

20. Major items of Blower Package
 Acoustic enclosure
 Quenching System

21. Blower Driver - Motor
 Generally if the Motor rating is <= 200 kW, Motor is in
HPEP scope
 If the Motor rating is > 200 kW, Motor is in BHEL Bhopal
scope

22. Major components of Blower
 Casing
 End Covers
 Diaphragms
 Rotor and Impellers
 Journal Bearings
 Thrust Bearings
 Coupling

23. Blower Performance
 Guarantees for FGD system will be:
 SO2 removal efficiency
 Limestone consumption
 Auxiliary power consumption
 Blower power shall be verified during FGD package
performance test as part of auxiliary power consumption
 Blower testing at shop shall be as per approved quality
plan

24. Oxidation Blower

25. Conventional Compressor Package

26. Oxidation Blower Package

27. Oxidation Blower Package

28. Thank You