Conditions and characteristics of droplets breakup for industrial waste-derived fuel suspensions ignited in high-temperature air

D. O. Glushkov, D. V. Feoktistov, G. V. Kuznetsov, K. A. Batishcheva, T. Kudelova, K. K. Paushkina

Research output: Contribution to journalArticle

Abstract

This research is focused on the ignition and combustion mechanisms and characteristics of single droplets of seven different composite liquid fuels, based on wet coal processing waste (fine coal + 50 wt% of water) with 40 wt% of vegetable oils (castor, rapeseed) and used petroleum-based oils (lubricants – motor, compressor, and turbine oils; working fluid – hydraulic oil; insulating fluid – transformer oil). The combustion of waste-derived fuel suspensions is initiated by introducing single droplets into heated motionless air with a temperature of 700–1,000 °C. Threshold conditions (component composition, concentration of combustible liquid, and temperature) were detected, for which micro-explosions during the induction period resulted in the full breakup of droplets, combustion of products (vapors and fine particles) and their subsequent rapid burnout. A high-speed video recording system is used to establish consistent patterns of physical and chemical processes, as well as ignition and combustion characteristics (ignition delay times, burnout time, velocity of breakup products, and size of their burnout area) for a group of fuels under the conditions of droplet breakup. A hypothesis about how the composition of the component affects the breakup of droplets during ignition was formulated based on the results of analyzing the properties (initial boiling point and evaporation rates of oils, their surface tension and surface free energy, as well as wettability of dry coal processing waste) of separate fuel components.

Original languageEnglish
Article number116915
JournalFuel
Volume265
DOIs
Publication statusPublished - 1 Apr 2020

Keywords

  • Breakup
  • Combustion enhancement
  • Fuel composition
  • Fuel droplets
  • Micro-explosion
  • Waste

ASJC Scopus subject areas

  • Chemical Engineering(all)
  • Fuel Technology
  • Energy Engineering and Power Technology
  • Organic Chemistry

Fingerprint Dive into the research topics of 'Conditions and characteristics of droplets breakup for industrial waste-derived fuel suspensions ignited in high-temperature air'. Together they form a unique fingerprint.

  • Cite this