Abstract
To meet the increasing volume of waste to be treated via
energy recovery, high SRF-energy-share fuel is being
fired in conventional waste-to-energy facilities. In this
work, corrosion related risk during firing of 70 e-%
share (target fuel) is studied and compared against the
base case fuel containing 50 e-% share. Cl and S
concentration is highest in the target fuel as a direct
result of increasing the proportion of SRF in the fuel
mixture. Br, Zn and Pb showed the same trend. Meanwhile,
the concentration of Na, K, Al and Si are highly
dependent on the type of the SRF fired. The corrosion
risk of the base and target fuels are analyzed using the
composition of the fine aerosol fraction and deposit
samples measured near the vicinity of the superheater.
Surprisingly aerosols for the target fuel are less risky
- having less Cl and more S, than that of the base fuel.
The effects of sulfur based additives - elemental sulfur
and sulfate injection, and fuel substitution on the risk
of superheater corrosion are likewise analyzed. All these
strategies can reduce the concentration of Cl in the
aerosols, however it is concluded that sulfate injection
is considered as a robust strategy for mitigating alkali
chloride formation. Sulfate injection is able to reduce
Cl in the aerosols and deposits regardless of the quality
of the fuel mixture. Robust strategies are important in
ensuring the boiler performance during high SRF-energy
share firing. An attempt of linking the quality of the
deposits and the properties of the flue gas and aerosols
around the superheater using partial least squares
regression is also presented.
Original language | English |
---|---|
Pages (from-to) | 25-36 |
Journal | Fuel |
Volume | 155 |
DOIs | |
Publication status | Published - 2015 |
MoE publication type | A1 Journal article-refereed |
Keywords
- alkali chloride mitigation
- corrosion
- SRF
- waste-to-energy