ISSN 0010-5082, Combustion, Explosion, and Shock Waves, 2018, Vol. 54, No. 3, pp. 376–384.
Pleiades Publishing, Ltd., 2018.
Original Russian Text
K.Yu. Vershinina, S.Yu. Lyrshchikov, P.A. Strizhak.
Ignition of Fuel Slurries Based on Waste Products
of Coal Processing and Oil Reﬁning
K. Yu. Vershinina
, S. Yu. Lyrshchikov
, and P. A. Strizhak
Published in Fizika Goreniya i Vzryva, Vol. 54, No. 3, pp. 137–146, May–June, 2018.
Original article submitted September 1, 2017.
Abstract: Results of an experimental study of conditions and characteristics of ignition of fuel
slurries prepared on the basis of typical waste products of coal washing and oil reﬁning are reported.
The main attention is paid to analyzing the diﬀerences in the characteristics and conditions of
ignition of organic coal–water slurries prepared on the basis of coal washing waste products (non-
baking, coking, low-caking, fat, gas, and ﬂame coals are considered). The ignition delay time
and the minimum (threshold) temperature of ignition of the examined slurries are estimated.
Conclusions on the inﬂuence of the properties and concentrations of the slurry components on the
combustion initiation characteristics are formulated.
Keywords: organic coal–water slurry, coal washing waste products, waste oil, ignition, ignition
In accordance with expert predictions [1–4], coal
is expected to keep its leading position in the world-
wide energy balance for the next decades. As reported
by the International Energy Agency [1, 2], almost 41%
of energy all over the world were produced in 2013 by
means of coal burning. This value increased to 46% in
Unfortunately, the processes of coal production,
processing, and utilization in industry exert a signiﬁ-
cant adverse eﬀect on the environment. In particular,
a large amount of wastes is formed during coal washing
(10–15% of the run-of-mine coal volume). Such wastes
are annually formed in an amount of hundreds of mil-
lion tons and are kept in dumps and storage facilities,
leading to environment contamination [1–3]. Ejection
of carbon dioxide, sulphur and nitrogen oxides, and ash
volatiles formed during coal dust burning may be the
reason for elevated disease rates in large cities [5–8]. In
regions of coal extraction and burning, soil and water
can become contaminated by heavy metals . Emis-
Tomsk Polytechnical University, Tomsk, 634050 Russia;
sions of coal power stations are responsible for acid
rains , etc. As coal burning induces changes in the
biosphere, which aﬀect human health, the search for
methods reducing the anthropogenic action of coal pro-
cessing and burning is of particular interest.
One method that allows fairly large-scale and eﬃ-
cient utilization of industrial combustible wastes (e.g.,
coal washing wastes, non-demanded petroleum prod-
ucts, and used turbine, motor, transformer, and other
oils), as well as low-grade coals is burning of these mate-
rials as components of composite liquid fuels. Depend-
ing on the composition, such fuels are called in publi-
cations as coal–water slurry (CWS) [11–13] and coal–
water slurry containing petrochemicals (CWSP) [14,
15]. The development of CWS and CWSP technolo-
gies favors not only safe utilization of wastes and ex-
tension of the raw fuel base, but also reduction of emis-
sions of harmful heavy oxides (as compared to the tradi-
tional high-temperature burning of coal dust). Previous
investigations [16–20] illustrate environmentally bene-
ﬁcial advantages of slurry burning, which are mainly
caused by burning temperature reduction and by the
water vapor capability of absorbing sulphur and nitro-
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