Ignition of droplets of coal–water–oil mixtures based on coke and semicoke

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Abstract

To permit expansion of the resource base and utilize industrial waste, coal–water–oil fuels may be prepared on the basis of coke and semicoke, as well as common petroleum derivatives (fuel oil and spent compressor, turbine, and transformer oils). The minimal oxidant temperature corresponding to stable ignition of coal–water–oil slurries is established. Typical variation in fuel temperature in the course of reaction is determined, as well as the delay time of ignition and the total combustion time for individual droplets of such fuel suspensions. For droplets of initial size 0.5–1.5 mm, the influence of the various factors (droplet size, oxidant temperature, and concentration of the components) on the threshold (minimum) temperature and inertia of ignition is studied. It is shown that stable ignition of coke and semicoke in such fuel is possible at moderate oxidant temperatures: 700–1000 K.

Original languageEnglish
Pages (from-to)28-36
Number of pages9
JournalCoke and Chemistry
Volume60
Issue number1
DOIs
Publication statusPublished - 1 Jan 2017

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Keywords

  • coal–water–oil slurries
  • coke
  • fuel ignition
  • fuel suspensions
  • ignition delay
  • semicoke
  • spent oil

ASJC Scopus subject areas

  • Environmental Chemistry
  • Fuel Technology
  • Process Chemistry and Technology

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