Post on 10-Jan-2016
description
Coal Beneficiation for Clean Coal Coal Beneficiation for Clean Coal
TechnologyTechnology
Dr Kalyan SenDr Kalyan SenDirector Director
Central Fuel Research InstituteCentral Fuel Research Institute
Dhanbad 828108Dhanbad 828108
Figure: Particle Size distribution for Indian coalsPSD of Indian Non Coking CoalsPSD of Indian Non Coking Coals
Figure 6a : Variation of GCV of noncoking coals
0
1000
2000
3000
4000
5000
6000
7000
0 10 20 30 40 50 60 70
Ash (60% RH)
GC
V (
Kc
al/k
g)
WCL
SECL
SCCL
MCL
NCL
CCL
Figure : Variation of VM of noncoking coal
15
17
19
21
23
25
27
29
31
33
35
0 10 20 30 40 50 60 70
Ash (60% RH)
VM
WCL
SECL
SCCL
MCL
NCL
CCL
Indian Coal as feed to TPSIndian Coal as feed to TPS
Favourable qualities: Huge reserve
Low S content ( <0.6%)
High AFT (>1100oC) Low Iron content Low Chlorine content Low toxic trace elements Reactive inertinites backback
Characteristic Ash vs RD
0.0
20.0
40.0
60.0
80.0
1.2 1.4 1.6 1.8 2 2.2RD
AS
Hnclcclmclw clLinear (w cl)Linear (ccl)Linear (ncl)Linear (mcl)
VM vs. RD
0.0
10.0
20.0
30.0
40.0
1.2 1.4 1.6 1.8 2 2.2
RD
VM
NCLCCLMCLWCLLinear (CCL)
FC vs. RD
0.010.020.030.0
40.050.060.0
1.2 1.4 1.6 1.8 2 2.2RD
FCNCLCCLMCLWCLLinear (CCL)Linear (NCL)Linear (MCL)Linear (WCL)
GCV vs. RD
0
2000
4000
6000
8000
1.2 1.4 1.6 1.8 2 2.2
RD
kca
l/kg
NCLCCLMCLWCLLinear (MCL)Linear (NCL)Linear (WCL)Linear (CCL)
DSC/TG of Density Fractions
0
510
15
10 20 30 40 50 60
ash%
Rmax
., %
/min
Maximum Rate Vs Ch. Ash
385
390
395
400
405
410
415
420
10 20 30 40 50 60
ash%
DT
G p
eak
, o
C
DTG Peak Temperature Vs Ch. Ash
Figure: Liberation characteristics of LVC & non-coking coal
0
10
20
30
40
50
60
70
80
90
100
0 5 10 15 20 25 30 35 40
Cum. Ash%
Cu
m. W
t%
X 100mm
X 38mm
X10mm
WB3 X75mm
WB3 X13mm
LVC coal of Western JhariaJig Cleans
Non-coking coal of SECL
Figure 4b:Range of cut density (d50) for power grade cleans from Indian noncoking coals
0
10
20
30
40
50
60
70
80
90
1.30 1.40 1.50 1.60 1.70 1.80 1.90 2.00
Relative Density
Fra
c. A
sh
%
50-55%
R & MR & M
National Programme
STRATEGY FOR ACHIEVING STRATEGY FOR ACHIEVING COAL BASED POWER TARGETCOAL BASED POWER TARGET
Improved Improved Coal QualityCoal Quality
• Mine planning • Assessment• Cleaning• Blending
Advance Advance TechnologyTechnology Larger Units CCT
Technology Routes for beneficiationTechnology Routes for beneficiation
Level Scheme Methodology Ash%reducn
Cleans (%)
M % over ROM coal
I Dry benefin. Separation of stone/shale based on differential breakage potentiality
3-4 >90 Nil
II Crushing, screening & coarse coal cleaning
Coarse coal (13/30mm) washed & mixed with untreated fines; dewatering screens.
<10 70-90 2-3%
III Crushing, screening and total cleaning
Coarser fraction washed at optimum efficiency levels: fine coal by Spiral: dewatering
>10 <60 3-4%
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Achievable yield of washed coal by different level of beneficiation
24 25 26 27 28 29 30 31 32 33 34 35 36 37
Ash, %
60
65
70
75
80
85
90
95
100Yield of Cleans,%
Level III (H
M)
Level
III (
JIG) Lev
el I
I (JI
G)Level I
I (HM)
Rotary
Bre
aker
Raw coal ash 37.0%
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