coal beneficiation for clean coal technology
DESCRIPTION
Coal Beneficiation for Clean Coal Technology. Dr Kalyan Sen Director Central Fuel Research Institute Dhanbad 828108. Figure: Particle Size distribution for Indian coals. PSD of Indian Non Coking Coals. Indian Coal as feed to TPS. Favourable qualities :. Huge reserve - PowerPoint PPT PresentationTRANSCRIPT
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%
backback
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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