DEVELOPMENT OF AN ELECTROSTATIC PRECIPITATOR FOR SMALL SCALE BIOMASS FURNACES

摘要

Electrostatic precipitators are reliable and able to reduce the concentrations of dust in flue gasrnsignificantly. In biomass-fired power plants electrostatic precipitators are state of the art, but for small scale furnacesrnESP-systems are a quite new technology. The challenge is to develop reliable ESP-systems for small and mediumrnscale furnaces. Fraunhofer engineers tested and optimized an ESP-system especially with regard to the fractions PMrn1.0 and PM 2.5. The goal was to develop a low cost ESP-system, which ensures compliance with emission limits.rnAttention was paid to ensure a good accessibility to make cleaning and maintenance as easy as possible. The ESPsystemrnwas designed to be easily combined with different types of furnaces and it is very independent from thernconditions at the installation location. This flexibility is needed to respond to the requirements that result from therndesign and performance of the different furnaces. To optimize flexibility and separation efficiency CFD simulationsrnwere carried out. Moreover a dimensioning tool based on the Deutsch-Equation for ESP systems and the optimizationrnof the fractional separation efficiency was developed and tested.