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 specializes in a distinct segment know-how, combustion of coal in an oxygen wealthy surroundings, that is one method of acquiring 'clean coal,' by way of making it more uncomplicated to trap carbon that's published within the combustion procedure. Toporov's ebook breaks floor on protecting the main basics of oxycoal applied sciences, that have no longer 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 presents the theoretical history of the method, the issues to be confronted, and the technical recommendations that have been accomplished in the course of those investigations.

  • Summarizes effects from investigations of oxyfuel applied sciences played at Aachen college, 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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Additional info for Combustion of Pulverised Coal in a Mixture of Oxygen and Recycled Flue Gas

Example text

In the case of carbon reaction with molecular oxygen, several authors [15,61,62] have suggested the existence of oxygen on the basal plane of aromatic structures. This oxygen is considered an additional oxygen source in the C− −O2 reaction. Theoretical calculations suggested that when oxygen is placed in the basal plane, the C− −C bond strength of the bridging atoms can be reduced by 30%. That means that the reactivity of carbonaceous material will also depend on the capability of trapping oxygen in the basal plane.

48] showed that relatively 30 Combustion of Pulverised Coal in a Mixture of Oxygen and Recycled Flue Gas little CO2 is formed in the boundary layers of small particles (less than 100 µm). Correspondingly, little thermal energy is transferred to the particle surface as a result of CO conversion in the boundary layer. Thus, for small particles, any CO2 formation must occur on the particle surface, not in the surrounding gas. 3 Effects of CO2 on coal devolatilisation and on particle ignition The presence of high concentrations of CO2 in the bulk gas could influence the coal pyrolysis process in two main ways [49]: • CO2 is a product of coal pyrolysis, which may affect the volatile composition and yield.

Therefore, the factors influencing the char reactivity and the char reaction rates are discussed in detail in the following sections bellow. Special emphasis is given to char gasification/combustion in CO2 atmosphere. 1 Factors influencing the reactivity of coal char Coal reactivity is affected by different variables that involve the coal properties that cannot be related only to coal physical structure or to process parameters. Coal reactivity decreases as coal rank increases. Miura et al. [60] found that the gasification reactivity data of chars prepared from 68 different coals by different authors, were very scattered for low-rank coals (carbon content less than 80 wt%), but the reactivity was higher than that obtained for higher-rank coals where the data were less scattered.

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