Andrei Dr. Bologa

Electrostatic charging of aerosol as a mechanism of gas cleaning from submicron particles

A process which includes condensational growing of submicron particle, their electrostatic charging and collection was shown to be effective in the removal of submicron particules from gas streams. The new designed CAROLA apparatus for gas cleaning from submicron particles, which has a low energy consumption for particles charging and a low pressure drop was tested. The CAROLA unit achieves high removal efficiencies for wood combustion aerosol, with a mean diameter of 66 nm.

Collection of Fine Particles by Novel Wet Electrostatic Precipitator

A novel wet electrostatic precipitator is designed for control of fine aerosol from humid effluent gases. It operates on the principle of unipolar particle charging in a DC corona discharge in a high velocity (> 20 m/s) ionizing stage and aerosol precipitation in the low velocity (< 3 m/s) collection stage under the field of particle own space charge. The high gas velocity in the ionizing section diminishes the corona suppression at high particle number concentrations of H2SO4 and HCl aerosol.

Fine particle generation, evolution and control by small biomass combustion

Purpose – The aim of the paper is to present the results of investigations of fine particle generation by small biomass combustion and the possibility of reducing the emissions by electrostatic precipitation.Design/methodology/approach – The grains, wood‐logs, wood‐, mixed‐ and straw‐pellets were combusted in two stoves and two boilers. The set‐ups were operated according to DIN‐4702. Particle number concentration in the gas flow was measured by Scanning Mobility Particle Sizer and particle mass concentration was measured according to the Guidelines VDI‐2066 upstream and downstream a novel space charge electrostatic precipitator (ESP). The ESP consists of an ioniser and a grounded brush inside of a tube form grounded collector electrode.Findings – The ESP ensures stable operation at gas temperatures up to 350°C. The use of sharp‐points high voltage electrode ensures effective particle charging at high particle number concentrations. The combustion of wood‐pellets is characterized by lower particle mass co...

Application of space-charge electrostatic precipitator for collection of oil mist from pyrolysis gases

A novel electrostatic precipitator CAROLAreg is developed for collection of fine oil mists. It operates on the principle of unipolar particle charging in the corona discharge and particle precipitation under the field of space charge. The pilot precipitator was tested at different gas temperatures. It is shown that the increase of gas temperature changes the characteristics of the corona discharge and particle size distribution, especially for droplets sub-micron droplets. The CAROLAreg precipitator was used for collection of oil mist from pyrolysis gases at the HALOCLEANreg plant. The flow rate of biomass in the HALOCLEANreg plant was 15-30 kg/h. The particle mass concentration in the raw gas was over 100 g/Nm3. The operation voltage of the precipitator was 10-12 kV and corona current up to 0,1 mA. Single stage electrostatic precipitator ensured mass collection efficiency 97-99,5% for pyrolysis oil mist.