Terms and Characteristics of Homogeneous Ignition of Coal-Water Particles Coated with a Water Film

S.V Syrodoy,K.A Bugaeva,R.I Taburchinov,N.Y Gutareva

doi:10.1051/epjconf/201611001058

Abstract

The problem of coal-water fuel ignition of particles in a high-temperature heating has been solved numericallyin the framework of a two-layer model of “coal-water”. The basic characteristics of the integrated ignition has been shown. The influence of the vaporization process of the water film on the ignition conditions has been shown.

Highlights

One of the most promising ways to reduce the environmental load of thermal power plants (TPP) coal power plants, both in Russia [1] and abroad [2] is the transition from the traditional ways of organizing combustion to the burning of coal in the various fuel compositions, for example - coal-water fuel (CWF)
According to the results of numerical modeling the basic temporal characteristics of processes of heat and ignition homogeneous preparation of coal-water fuel particles coated with a water film have been set up
It has been shown that an increase in the thickness of the water film has a negligible (0.1 to 2%) impact on the delay time of ignition

Summary

Introduction

One of the most promising ways to reduce the environmental load of thermal power plants (TPP) (reducing emissions of nitrogen oxides and sulfur) coal power plants, both in Russia [1] and abroad [2] is the transition from the traditional ways of organizing combustion (e.g., flaring [3] or layers [4]) to the burning of coal in the various fuel compositions, for example - coal-water fuel (CWF). Designed to date model ignition [2, 6,7,8] drops of WCF are based on the hypothesis of a uniform distribution in the amount of the basic elements of the system “water ― organic and mineral part of fuel” It has been established experimentally [9] in the process of spraying the fuel in the combustion chamber may be formed of water-coal particles, which are “pillars” [9] (homogeneous particle) carbon coated with a thin film of water. The purpose of our work ― mathematical modeling of ignition of coal-water fuel particles in a corresponding firing installations boiler as part of a two-layer structure of the “coal ― water” and the definition of the main characteristics and conditions of the ignition of such a particle WCF

Physical and Mathematical Statement

Conclusion