Low temperature combustion of organic coal-water fuel droplets containing petrochemicals while soaring in a combustion chamber model

Abstract

The paper examines the integral characteristics (minimum temperature, ignition delay times) of stable combustion initiation of organic coal-water fuel droplets (initial radius is 0.3-1.5 mm) in the oxidizer flow (the temperature and velocity varied in ranges 500-900 K, 0.5-3 m/s). The main components of organic coal-water fuel were: brown coal particles, filter-cakes obtained in coal processing, waste engine, and turbine oils. The different modes of soaring and ignition of organic coal-water fuel have been established. The conditions have been set under which it is possible to implement the sustainable soaring and ignition of organic coal-water fuel droplets. We have compared the ignition characteristics with those defined in the traditional approach (based on placing the droplets on a low-inertia thermocouple junction into the combustion chamber). The paper shows the scale of the influence of heat sink over the thermocouple junction on ignition inertia. An original technique for releasing organic coal-water fuel droplets to the combustion chamber was proposed and tested. The limitations of this technique and the prospects of experimental results for the optimization of energy equipment operation were also formulated.

Ignition of the Soaring Droplet Sets of Waste-Derived Coal-Water Slurry With Petrochemicals

“…The experimental setup and the used method are similar to described in [8]. Determination of the integral parameters of the single fuel droplets and droplet groups in soaring regime was done using special combustion chamber.…”

“…Unlike to experiments presented at [8] the introduction of three fuel droplets into the chamber (and their synchronized ejection) was done by specially developed device ( fig. 1).…”

“…The analysis of the video records of the soaring droplet combustion was done using special abilities of the Tema Automotive package allowing continuous tracking of the moving objects and checking of their brightness to determine the ignition delay times for each fuel droplet (τ d ) like it was done in [8]. …”

“…becomes an important factor determining the parameters of the ignition and combustion processes. As result, we offer the method allowing the investigation of ignition of fuel droplet sets as well as single droplets in case of its free soaring in the hot oxidant flow (air) inside the special combustion chamber [8]. The presented approach doesn't need any holders for fuel droplets and allows observations of the combustion process as it is inside industrial chambers.…”

Statistical Analysis of Consequences Caused by the Collisions of Soaring Drops of Organic Coal-Water Fuel

“…To determine the characteristics of ignition particles OCWF (or groups of particles) without the use of holders developed an experimental technique that provides its wool-oxidant environment using specialized combustion chambers [6]. For the aggregate, group, set or stream of droplets soaring to play a decisive role droplet collision processes (crushing, coagulation, decomposition).…”