The impact of cavitation-activated water on combustion dynamics and environmental characteristics of coal-water slurry fuel

Abstract

Among the new coal technologies the burning of low-grade coal in the form of coal-water slurry fuel (CWSF) is of a great interest. The basis of CWSF is a highly concentrated coal-water slurry consisting of finely ground coal, water or other liquid and plasticizing agents. The development of CWSF technology is highly relevant for solving global problems of resource conservation and ecology. The study is dedicated to CWSF properties with respect to Kansk-Achinsk coal and water. This paper presents the results of the influence of CWSF’s preliminary cavitation water treatment on the combustion dynamics of fuel, (including the features of the combustion temperature trends, delayed ignition time and time of complete combustion) and on its environmental characteristics. A rotary-type hydrodynamic oscillator at high angular velocity (10000 rpm) was used in supercavitation mode. It is shown that the technology of cavitation water treatment leads to a change in the dynamics of CWSF’s combustion and to an additional decrease in NOx emissions by 1.6 times, CO2 by 1.3 times.

Современное Состояние Использования Кавитационных Технологий (Краткий Обзор)

“…Среди новых угольных технологий большой интерес представляет сжигание низкосортного угля в виде водоугольного шламового топлива. В статье [33] представлены результаты влияния предварительной кавитационной обработки воды в составе водоугольного топлива на динамику сгорания топлива и на его экологические характеристики. В режиме суперкавитации использовался гидродинамический осциллятор роторного типа.…”

Application of Cavitation in Oil Processing: An Overview of Mechanisms and Results of Treatment

“…To prepare coal–water fuels, which are a suspension of coal in water, it is common to use hydrodynamic cavitation; this affects the basic properties of liquid fuel (the size of particles of the disperse phase of the slurry, thermal–physical, rheological, and sedimentation properties) and provides for intense mass transfer and turbulent stirring. In ref , cavitation treatment of the coal–water slurry and its components was shown to reduce harmful emissions during its combustion. Time-stable coal–water mixtures produced by cavitation are attributed to a sophisticated mechanism of interaction of coal particles, modifying additives and humic acids, which are also a part of coal and the variation of pH of the disperse medium.…”