Download Combustion of Pulverised Coal in a Mixture of Oxygen and by Dobrin Toporov PDF

By Dobrin Toporov

Combustion of Pulverised Coal in a mix of Oxygen and Recycled Flue Gas makes a speciality of a distinct segment expertise, combustion of coal in an oxygen wealthy atmosphere, that's one method of acquiring 'clean coal,' through making it more uncomplicated to catch carbon that's published within the combustion strategy. Toporov's publication breaks floor on masking the major basics of oxycoal applied sciences, that have now not but been lined during this depth.

Combustion of Pulverised Coal in a mix of Oxygen and Recycled Flue Gas summarizes the most effects from a pioneering paintings on experimental and numerical investigations of oxyfuel applied sciences. It offers the theoretical historical past of the method, the issues to be confronted, and the technical suggestions that have been completed in the course of those investigations.

  • Summarizes effects from investigations of oxyfuel applied sciences played at Aachen collage, Germany
  • Provides theoretical historical past, in addition to the first difficulties of those applied sciences and the way they are often solved

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Extra resources for Combustion of Pulverised Coal in a Mixture of Oxygen and Recycled Flue Gas

Sample text

This fluidity normally occurs in coals with 81–92 wt% carbon, but it depends on oxygen and hydrogen content in the coal as well as on the heating rate. Plastic properties become more pronounced at high heating rates, up to a point; if the heating rates become too high, coals cannot plasticise or fluidise, because crosslinking reaction temperatures are rapidly reached before the coal structure can relax and fluidise. Further, the metaplast either (1) vaporises and escapes the coal particle, or (2) crosslinks back into the macromolecular structure.

The variations in the species distribution of light gas as a function of rank are believed to be the result of variation in the composition of the aliphatic side chains. 2 Coal particles ignition Investigations of ignition mechanisms showed that the ignition of char particles typically occurs heterogeneously, whereas coal particles may ignite heterogeneously (caused by the coke-oxidation reaction), homogeneously (caused by volatile-matter oxidation in the gas phase), or by a combination of both mechanisms [43–45].

1 atm with the particle temperature varying from 1200 K to 2000 K. It was found that the char was attacked by oxygen both externally and internally, the contribution to weight loss from these two being of equal importance. The combustion rate was found to be directly proportional to the oxygen partial pressure (representing first-order reaction, n = 1), and the combustion rate coefficient, based on the external surface area, was independent of oxygen concentration and particle size. It was also found that CO, not CO2 , was the primary combustion product.

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