Abstract

Volatile matter values for solid fuels are used to assess their burning rates and, thus, provide a basis for the buying and selling of these fuels. The major factors that affect volatile matter yields are the type of fuel, moisture contents, and the heating rates used in the tests. This paper reports the results of experiments designed to improve the reliability and application of test methods for the determination of volatile matter in various solid fuels. The macro thermogravimetric analysis studies described herein include the rapid drying of analysis samples of coal and the effect on volatile matter yields, the heating of various chars at high temperatures to reach a state of constancy, the measuring of decomposition moisture, an “elusive” constituent in coal, and the cocombustion of coals and other solid fuels. The presence of residual moisture and decomposition moisture in the coal during the volatile matter tests increases the measured volatile matter yields even though the residual moisture has been factored out. The rates of heating solid fuels during volatile matter tests affect the volatile matter yields because of the presence of different types of moisture in the fuel that are released at different temperatures. The heating rates used in volatile matter tests affect the type of compounds released and the total volatile matter yields of coals and biofuels. The experiments reported in this paper were instrumental in the decision of ASTM Committee D05 on Coal and Coke to recently revise the classic volatile matter standard test method D3175 to change the temperature for drying sparking coals from 600°C to 107°C. The role volatile matter plays in the combustion of fuel blends is discussed in this article.

References

1.
Standard Terminology of Coal and Coke
, ASTM D121-15 (
West Conshohocken, PA
:
ASTM International
, approved September 1,
2015
), https://doi.org/10.1520/D0121-15
2.
Riley
J. T.
, “
Proximate Analysis
,” in
Routine Coal and Coke Analysis: Collection, Interpretation, and Use of Analytical Data
, 2nd ed. (
West Conshohocken, PA
:
ASTM International
,
2014
),
29
47
, https://doi.org/10.1520/MNL57-2ND-EB
3.
Standard Classification of Coals by Rank
, ASTM D388-19a (
West Conshohocken, PA
:
ASTM International
, approved Nov. 1,
2019
), https://doi.org/10.1520/D0388-19A
4.
Standard Test Method for Volatile Matter in the Analysis Sample of Coal and Coke
, ASTM D3175-20 (
West Conshohocken, PA
:
ASTM International
, approved February 1,
2020
), https://doi.org/10.1520/D3175-20
5.
Appendix X1: Chronology of Changes to ASTM D05 Procedure for Volatile Matter
,” in
Standard Test Method for Volatile Matter in the Analysis Sample of Coal and Coke
, ASTM D3175-20 (
West Conshohocken, PA
:
ASTM International
, approved February 1,
2020
), https://doi.org/10.1520/D3175-20
6.
Standard Test Methods for Proximate Analysis of Coal and Coke by Macro Thermogravimetric Analysis
, ASTM D7582-15 (
West Conshohocken, PA
:
ASTM International
, approved May 15,
2015
), https://doi.org/10.1520/D7582-15
7.
Standard Test Method for Volatile Matter in the Analysis of Particulate Wood Fuels
, ASTM E872-82(2019) (
West Conshohocken, PA
:
ASTM International
, approved April 1,
2019
), https://doi.org/10.1520/E0872-82R19
8.
Solid Fuels – Determination of Moisture, Volatile Matter, and Ash with the Automatic Analyzer
, PN-G-04560:1998 (Warsaw, Poland:
Polish Committee for Standardization
,
1998
).
9.
Hard Coal and Coke—Determination of Volatile Matter
, ISO 562:2010 (Geneva, Switzerland:
International Organization for Standardization
,
2010
).
10.
Brown Coals and Lignites—Determination of the Volatile Matter in the Analysis Sample—Part 1: Two-Furnace Method
, ISO 5071-1:2013 (Geneva, Switzerland:
International Organization for Standardization
,
2013
).
11.
Riley
J. T.
,
Yanes
E. G.
,
Marsh
M.
,
Lawrenz
D.
, and
Eichenbaum
L.
, “
Coal and Coke Volatile Matter Determination and Reconciliation of Differences in Yields Determined by Two ASTM Methods,
Journal of Testing and Evaluation
38
, no. 
4
(July
2010
):
458
466
, https://doi.org/10.1520/JTE102746
12.
Marsh
M.
and
Riley
J. T.
, “
Moisture and Heating Rate Effects on Volatile Matter Yields for Coals,
Journal of Testing and Evaluation
47
, no. 
1
(
2019
):
384
401
, https://doi.org/10.1520/JTE20170407
13.
Riley
J. T.
,
Marsh
M.
, and
Darling
A.
, “
Decomposition Moisture–the Hidden Reactive Constituent in Coal
,”
Journal of Testing and Evaluation
49
, no. 
5
(September/October
2021
):
3234
3246
, https://doi.org/10.1520/JTE20200224
14.
Huang
H.
,
Wang
K.
,
Klein
M. T.
, and
Calkins
W. H.
, “
Determination of Coal Rank by Thermogravimetric Analysis
,”
American Chemical Society Division of Energy and Fuels Preprints
40
, no. 
3
(
1995
):
465
469
.
15.
Huang
H.
,
Wang
K.
,
Wang
S.
,
Klein
M. T.
, and
Calkins
W. H.
, “
Applications of Thermogravimetric Analysis in the Study of Fossil Fuels
,”
American Chemical Society Division of Energy and Fuels Preprints
41
, no. 
1
(
1996
):
1
7
.
16.
Riley
J. T.
,
Gilleland
S. R.
,
Forsythe
R. F.
,
Graham
H. D.
, and
Hayes
F. J.
, “
Nonadditive Analytical Values for Coal Blends
” (paper presentation,
Seventh International Coal Testing Conference
, Charleston, WV, March 21,
1989
).
17.
Standard Practice for Preparing Coal Samples for Analysis
, ASTM D2013/D2013M-20 (
West Conshohocken, PA
:
ASTM International
, approved February 1,
2020
), https://doi.org/10.1520/D2013_D2013M-20
18.
Standard Practice for Collection and Preparation of Coke Samples for Laboratory Analysis
, ASTM D346/D346M-11(2019)e1 (
West Conshohocken, PA
:
ASTM International
, approved August 1,
2019
), https://doi.org/10.1520/D0346_D0346M-11R19E01
19.
Standard Practice for Preparation of Biomass for Compositional Analysis
, ASTM E1757-19 (
West Conshohocken, PA
:
ASTM International
, approved April 1,
2019
), https://doi.org/10.1520/E1757-19
20.
Del Campo
B.
,
Brewer
C. E.
,
Brown
R. J.
, and
Johnson
P.
, “
Characterization of Biochar through Proximate Analysis
” (paper presentation,
Third Biochar Conference
, Edinburgh, UK, May 25,
2011
).
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