Ignition of an organic water–coal fuel droplet floating in a heated-air flow

T. R. Valiullin, P. A. Strizhak, S. A. Shevyrev, A. R. Bogomolov

Research output: Contribution to journalArticle

2 Citations (Scopus)

Abstract

Ignition of an organic water–coal fuel (CWSP) droplet floating in a heated-air flow has been studied experimentally. Rank B2 brown-coal particles with a size of 100 μm, used crankcase Total oil, water, and a plasticizer were used as the main CWSP components. A dedicated quartz-glass chamber has been designed with inlet and outlet elements made as truncated cones connected via a cylindrical ring. The cones were used to shape an oxidizer flow with a temperature of 500–830 K and a flow velocity of 0.5–5.0 m/s. A technique that uses a coordinate-positioning gear, a nichrome thread, and a cutter element has been developed for discharging CWSP droplets into the working zone of the chamber. Droplets with an initial size of 0.4 to 2.0 mm were used. Conditions have been determined for a droplet to float in the oxidizer flow long enough for the sustainable droplet burning to be initiated. Typical stages and integral ignition characteristics have been established. The integral parameters (ignition-delay times) of the examined processes have been compared to the results of experiments with CWSP droplets suspended on the junction of a quick-response thermocouple. It has been shown that floating fuel droplets ignite much quicker than the ones that sit still on the thermocouple due to rotation of an CWSP droplet in the oxidizer flow, more uniform heating of the droplet, and lack of heat drainage towards the droplet center. High-speed video recording of the peculiarities of floatation of a burning fuel droplet makes it possible to complement the existing models of water–coal fuel burning. The results can be used for a more substantiated modeling of furnace CWSP burning with the ANSYS, Fluent, and Sigma-Flow software packages.

Original languageEnglish
Pages (from-to)53-60
Number of pages8
JournalThermal Engineering
Volume64
Issue number1
DOIs
Publication statusPublished - 1 Jan 2017

Fingerprint

Ignition
Air
Thermocouples
Cones
Crankcases
Video recording
Plasticizers
Lignite
Software packages
Flow velocity
Drainage
Gears
Quartz
Time delay
Furnaces
Heating
Glass

Keywords

  • droplet
  • floatation
  • ignition
  • ignition-delay time
  • organic water–coal fuel
  • particle
  • slurry

ASJC Scopus subject areas

  • Nuclear Energy and Engineering
  • Energy Engineering and Power Technology

Cite this

Ignition of an organic water–coal fuel droplet floating in a heated-air flow. / Valiullin, T. R.; Strizhak, P. A.; Shevyrev, S. A.; Bogomolov, A. R.

In: Thermal Engineering, Vol. 64, No. 1, 01.01.2017, p. 53-60.

Research output: Contribution to journalArticle

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