Cyclone furnace as a way for mercury removal from lignite

Abstract

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.

Environment–Energy–Economy Analysis and Related Technical Transition Strategies for Spent Activated Carbon Regeneration in China

“…Thermal regeneration can be classified as rotary kiln, tunnel kiln, and cyclone furnace regeneration according to furnace types. Rotary kiln regeneration presents stable operation, high treatment capability, and a relatively low cost. , Cyclone furnace regeneration enables intensive feedstock mixing and offers a simple structure, high regeneration efficiency, and low investment cost. − A tunnel kiln is a periodic and continuously operating furnace with long service life and high yield but may consume high energy . Microwave regeneration presents advantages, including rapid and precise temperature control and time-saving, and could maintain a better pore structure of AC .…”