On the Effect of the Distances between Coal and Wood Particles during Their Joint Pyrolysis on Sulfur Oxides Formation

Stanislav Yankovsky,Albina Misyukova,Geniy Kuznetsov,Anton Tolokol’Nikov

doi:10.3390/en14248321

Abstract

The simultaneous pyrolysis of coal with wood was experimentally found to allow reducing concentrations of sulfur-containing substances in gases released. The objective of experimental studies is comparison of the sulphate of calcium and aluminum in the ash of coal-wood mixtures after pyrolysis of the latter in a dense “packing” of aggregate particles of these two fuels and at a few millimeters distance between particles. The 3B-grade lignite, T-grade bituminous coal and pinewood sawmill waste were chosen as feedstocks for pyrolysis experiments because they are widespread in Russia as well as many other countries. The elemental composition of all raw materials and pyrolysis residues was determined. The inorganic composition of obtained pyrolysis product in the solid phase was characterized by X-ray analysis. The content of aluminum and calcium sulfate in residue in case of simultaneous processing of coal with wood was found to be higher, compared to the processing of coal only (within the random errors of the experiment), than those established for such mixtures under conditions of dense “packing” of large masses (up to 15 g).

Highlights

The problems of energy security are becoming more and more urgent every year [1,2]and come to the fore in the development strategies of many countries of the world community [3]
Show that the share of electricity generated by coal-fired power plants in the total electricity balance has only increased over the past 20 years [15], despite numerous statements about the intensive growth of electricity generated by wind turbines and solar panels [16]
Increase in the proportion of the latter to 50% in the mixture of wood and T grade coal particles leads to formation of fine-grained, well-formed and less porous agglomerates in comparison with ash particles of coal mixtures of lignite coal and biomass under identical pyrolysis conditions

Summary

Introduction

The problems of energy security are becoming more and more urgent every year [1,2]and come to the fore in the development strategies of many countries (for example, India, China, the United States, Germany, etc.) of the world community [3]. Over the past three decades, attempts have been made to replace the traditional sources of electric energy (thermal and nuclear power plants) in most developed countries with non-traditional (or alternative) sources: solar [10], wind [11], and biomass [12,13]. Show that the share of electricity generated by coal-fired power plants in the total electricity balance has only increased over the past 20 years [15], despite numerous statements about the intensive growth of electricity generated by wind turbines and solar panels [16]. According to the forecasts of the International Energy Agency [17], coal-fired thermal power plants (TPPs) will generate electricity significantly more than any other energy enterprises until at least 2040

Methods

Results

Conclusion