Abstract
This study presents the concept of a cyclone furnace for coal dust combustion and gasification under conditions of oxy-fuel combustion. A two-chamber design of the cyclone furnace allows for the separation of the process of heating, drying and devolatilization of fuel from processes of its combustion and gasification of carbon residue. The choice of process parameters helps control fuel gasification. Supplying the driving gas with a specific composition (O2, CO2) to the chamber PC1 ensures the control of temperature and composition of combustible gases obtained through gasification. These gases can be used as a fuel for power boilers and, consequently, allow for utilization of the oxy-fuel combustion technology in new or existing power boilers.
Highlights
The burning of fossil fuels in many countries is the main source of electricity and heat
PC1) (Fig. 1) features nozzles that allow for implementation of the driving medium with oxidant (O2, CO2), whereas the upper part of the chamber PC2 contains inlets for coal dust through which the dust is supplied to a cyclone furnace pneumatically, using the stream of CO2
Conditions of coal dust gasification process, which are the subject of numerical modelling were as follows: flow of coal dust with mean grain size of 500 μm of 1∙10-3 kg/s supplied tangentially with two inlets located at the opposite sides of the chamber PC2 (Fig. 1) in the CO2 stream at the rate of 3 m/s
Summary
The burning of fossil fuels in many countries is the main source of electricity and heat. The processes of fossil fuel combustion in conventional boilers (stoker boilers, direct flow boilers, or fluidized bed boilers) are already wellrecognized and no further significant development of these technologies is expected. Due to their negative impact on the natural environment, the use of fossil fuels in the power industry (CO2, SOx, NOx, Hg, HCl and dust emission) will be reduced in the coming years. The recently rising costs of CO2 emission allowances will limit the development of energy based on burning fossil fuels. The gas produced during coal gasification can be used as a substrate for various chemical processes or as a fuel
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