Influence of cavitation treatment on the properties of coal-water slurries with pyrogenetic liquid and characteristics of their atomization by a pneumatic nozzle-Reference-Cited by-同舟云学术

Influence of cavitation treatment on the properties of coal-water slurries with pyrogenetic liquid and characteristics of their atomization by a pneumatic nozzle

Published:2023-07-07 Issue:2 Volume:27 Page:297-309
ISSN:2782-6341
Container-title:iPolytech Journal
language:
Short-container-title:jour

Author:

Gvozdyakov D. V.¹,Zenkov A. V.¹,Maltsev L. I.²^ORCID,Podzharov Yu. S.²

Affiliation:

1. National Research Tomsk Polytechnic University

2. Federal State Budgetary Institution of Science named after S.S. Kutateladze Institute of Thermophysics of the Siberian Branch of the Russian Academy of Sciences

Abstract

Experimental studies were conducted to investigate the rheological properties and atomization characteristics of coal-water slurries sprayed by a pneumatic nozzle with addition of pyrogenetic liquid. The research object was coal-water slurries prepared on the basis of long-flame coal using a rotary hydrodynamic cavitation generator. The dynamic viscosity of samples was investigated using a Reotest-2 rotary viscometer. The droplet size of atomized slurries was determined by the interferometric particle imaging method. A pneumatic nozzle designed for spraying of coal-water slurry fuels was used. The calorific value of coal-water slurry compositions was estimated by a theoretical method using Mendeleev's equation for calculating the lower heating value of combustion of organic substances with a certain elemental composition. It was found that cavitation treatment of a two-component coal-water fuel for 90 s leads to a 48% decrease in its viscosity. It was shown that substitution of water with a similar amount of pyrogenic liquid (5 to 20%) leads to an increase in the viscosity of coal-water fuels. The cavitation treatment of such slurries reduces the viscosity of the respective three-component coal-water fuels by 27–45%. According to the results of static sedimentation studies, coal particles start to precipitate 24 h after the onset of cavitation treatment. The treatment of the slurries under consideration for 27 and 90 s in a rotary hydrodynamic cavitation generator was established to reduce the average droplet size in the jet after spraying with a pneumatic nozzle by 5.5% and 6.5%, respectively. The introduction of pyrogenetic liquid into the composition of coal-water fuels increases their calorific value by 6.9%. It can be concluded that the use of pyrogenetic liquid in the composition of coal-water slurry fuels followed by their treatment in a rotary hydrodynamic cavitation generator can solve the problem of low reactivity of coal-water slurries.

Publisher

Irkutsk National Research Technical University

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