Emissions of Mercury and Cadmium when Co-Firing Municipal Sewage Sludge and/or Waste Pellets with Biomass in a CFB Boiler
Paper in proceedings, 2012

Mercury (Hg) and cadmium (Cd) are the two most toxic heavy metals listed among trace elements. Emission limit values for these exist when burning waste in European Union (EU)countries. These emission limits are also valid for the case of co-combustion of waste fractions with a clean biomass as wood chips originating from stem wood. This has been studied in the 12MWth boiler located at Chalmers University of Technology by means of co-combustion of municipal sewage sludge and/or sorted, crushed and pre-dried waste pellets from IcoPower in the Netherlands. As base fuel a clean biomass was used consisting of only stem wood in the form of wood chips. Emissions of Hg and Cd were measured in the stack. An evaluation was also made of the importance of a highly efficient textile bag filter for the prevention of these emissions. Due to higher concentrations of Hg and Cd in the waste fuel streams, higher loading of Hg and Cd into the boiler was attained. The distribution of Hg and Cd into the outgoing flue-gas and fly ash streams was also determined.

Sludge

Trace elements

Waste

Fluidized bed

Metal emissions

Author

Dongmei Zhao

Chalmers, Chemical and Biological Engineering, Environmental Inorganic Chemistry

Lars-Erik Åmand

Chalmers, Energy and Environment, Energy Technology

Johannes Öhlin

Chalmers, Energy and Environment

Jessica Malene Bohwalli

Chalmers, Energy and Environment

Rongrong Cai

Yanguo Zhang

Proceedings of the 21st International Conference on Fluidized Bed Combustion

Subject Categories

Inorganic Chemistry

Materials Engineering

Chemical Engineering

Driving Forces

Sustainable development

Areas of Advance

Energy

More information

Created

10/7/2017