Title:
Formation Mechanisms and Physical Properties of Particles from Wood Combustion for Design and Operation of Electrostatic Precipitators
Author(s):
Nussbaumer, T., Lauber, A.
Document(s):
Paper
Abstract:
The particles from biomass combustion are collected in a laboratory electrostatic precipitator (ESP). Three different combustion regimes are maintained by a modified pellet boiler, i.e., high temperature and sufficient oxygen, high temperature and local lack of oxygen, and low temperature. The resulting particles are classified as salts, soot, and condensable organic compounds (COC) based on the particle type expected from the theory of particle formation. The chemical and electrical properties are analysed and confirm the classification: While salts exhibit a low carbon content, soot and COC are high in carbon. Soot and COC can be distinguished by significantly different molar C/H-ratio being 6.44 for soot and 1.24 for COC. The electrical conductivity, which is a key parameter for the precipitation and dust layer built-up in the ESP, is measured at different temperatures and humidities. Significant differences in conductivity are found for salts, soot, and COC, and in addition, a strong influence of the humidity of the flue gas is observed. Salt is confirmed to be ideal for ESP, while soot reveals high conductivity leading to re-entrainment of agglomerated particles, and COC exhibit low conductivity leading to back-corona which can be limiting at low humidity. The presented particle properties can be applied as guideline for ESP design and operation.
Keywords:
aerosol, chemical composition, combustion, gas cleaning, particle emission
Topic:
Thermochemical conversion - Combustion for small scale applications
Subtopic:
Measurement and reduction of sintering, corrosion and particles emissions of small biomass combustion equipments
Event:
18th European Biomass Conference and Exhibition
Session:
OA11.3
Pages:
1219 - 1227
ISBN-13:
978-88-89407-56-1
ISBN-10:
88-89407-56-5
Paper DOI:
10.5071/18thEUBCE2010-OA11.3
Price:
FREE
