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

By Dobrin Toporov

Combustion of Pulverised Coal in a mix of Oxygen and Recycled Flue Gas specializes in a distinct segment expertise, combustion of coal in an oxygen wealthy surroundings, that is one method of acquiring 'clean coal,' via making it more straightforward to seize carbon that's published within the combustion approach. Toporov's publication breaks floor on masking the foremost basics of oxycoal applied sciences, that have no longer but been coated 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 history of the method, the issues to be confronted, and the technical ideas that have been accomplished in the course of those investigations.

  • Summarizes effects from investigations of oxyfuel applied sciences played at Aachen collage, Germany
  • Provides theoretical heritage, 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

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Other critical issues that require intensive R&D before applying the oxycoal technology include these: • In terms of recirculation of flue gas: The determination of the “place of extraction” is a function of the type of RFG, namely, cold and dry, cold and wet, or hot and wet RFG • In terms of corrosion: Material choice, controlled flame temperatures, and excess oxygen ratio • In terms of combustion stability: Fame temperature, flame shape, PF and oxygen concentrations, partial loads, flame stability, the volume of the RFG, and the place of FG extraction • In terms of startup and shutdown conditions: Burner design and burner settings • In terms of thermal efficiency: Heat transfer inside the furnace and in the convective part • In terms of ASU and CO2 compression: Oxygen quality, FG composition, emissions, etc.

The metaplast that vaporises, referred to as tar, is a mixture of aromatic compounds with average molecular weights in the range of 350 whose chemical structure closely resembles that of the parent coal [36]. The tar is the primary source of soot, which dominates radiative heat transfer in the volatile flame region. Side chains and the broken bridge material are released as light gas in the form of light hydrocarbons and oxides. As coal pores melt and fuse, the subsequent formation of bubbles (filled with light gases and tar vapour) results in swelling.

Heating rate effects can be explained by the competition between tar formation (bridge breaking), tar destruction (cross-linking), and tar evolution (mass transfer), all of which depend differently on temperature. Particle size effects become small at diameters below 200 µm and are usually ignored in pulverised coal applications. Devolatilisation behaviour is largely dependent on coal type [39]. Low-rank coals (lignites and subbituminous coals) release a relatively large amount of light gases and less tar.

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