AgroFossilFree - ELECTROSTATIC PRECIPITATORS FOR SMALL STRAW BOILERS

Allgemeine Beschreibung

Straw combustion generates a high concentration of particle emission. Particulate matter in ambient air is associated with health problems. Therefore, there is a need for a filter technology to clean the flue gas and achieve an effective reduction of dust emission from biomass boilers. The aim of this work has been to develop and optimize electrostatic precipitators for small biomass boilers. Focus has been on a filter connected to a 150 kW manually stoked batch straw boiler. In order to ensure low emissions, a high flexibility of the ESP is required, ie. an accurate regulated ratio between the heating time of the ESP and the boiler operation must be guaranteed inclusive operation at partial load and especially during start-up. Control automation as well as effective mechanical systems for removing dust deposits on discharge electrodes and plate collectors have been developed and tested. For a set-up with the 150 kW manual batch stoked straw boiler results show a filter efficiency of about 95 percent. The PM in the cleaned flue gas is 6-16 mg Nm-3. The technology will contribute to increase the use of biomass and help in reducing in overall CO2 emissions by substitution of fossil energy with renewable biomass.