Modelling of the process of coal dust combustion in a cyclone furnace

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.

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Gasification of Coal Dust in a Cyclone Furnace in an O2/H2O Atmosphere

Energies ◽

10.3390/en13092253 ◽

2020 ◽

Vol 13 (9) ◽

pp. 2253 ◽

Cited By ~ 1

Author(s):

Robert Zarzycki ◽

Justyna Jędras ◽

Rafał Kobyłecki

Keyword(s):

Coal Dust ◽

Combustion Process ◽

Calorific Value ◽

Process Conditions ◽

Cyclone Furnace

This paper presents the results of the modeling of coal dust gasification using oxygen and steam in a cyclone furnace. The combustion process leads to the release of gas composed mainly of CO and H2. The composition of this gas can be controlled through changes in the content of O2 and H2O in the gasifying agent. It is possible for the process conditions adopted in the study to obtain the CO content at the level of 50% with the content of the gasifying agent O2/H2O of 50/50. In the case of the composition of the gasifying agent O2/H2O of 80/20, the H2 content was 50%. The maximal calorific value of the gas was obtained for O2/H2O 50/50 (11.2 MJ/kg).

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Cyclone furnace as a way for mercury removal from lignite

MATEC Web of Conferences ◽

10.1051/matecconf/201824005037 ◽

2018 ◽

Vol 240 ◽

pp. 05037 ◽

Cited By ~ 1

Author(s):

Robert Zarzycki ◽

Michał Wichliński

Keyword(s):

Heat Treatment ◽

Numerical Modelling ◽

Power Plants ◽

Coal Dust ◽

Mercury Removal ◽

Hard Coal ◽

Heating Fuel ◽

Cyclone Furnace ◽

Methods Of Operation ◽

Fuel Stream

The power plants will have to meet the requirements regarding permissible Hg emission levels by 2021. A particularly unfavourable situation is observed for front of lignite, which contains more mercury than hard coal, and in addition its combustion also causes more CO2 emissions. The paper presents the proposal to use the cyclone furnace in the process of heat treatment for the process of the release of mercury from lignites. The structure and methods of operation of the cyclone furnace were presented. The paper also discusses the methodology of the process of numerical modelling of combustion and gasification of coal dust. The results showed that changing a fuel stream fed to the cyclone furnace allows for controlling the temperature and degree of fuel devolatilization. This leads to heating of the fuel to the desired temperature due to the expected level of mercury removal from the fuel. This is very important especially in the case of fuels containing significant amounts of moisture, such as lignite. The experiments performed in the study confirmed the results of numerical calculations for heating fuel and showed the possibility of over 90% removal of mercury from the fuel. The results confirmed the laboratory workplace rotary kiln.

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