Vermeidung von flüssigen, aggressiven, natriumhaltigen Kondensaten in Elektrofiltern hinter Glasschmelzwannen

• Prevention of liquid, aggressive, sodium containing condensates in electrostatic filters behind glass-melters

Neumann, Amelie; Conradt, Reinhard (Thesis advisor)

Aachen : Publikationsserver der RWTH Aachen University (2013)
Dissertation / PhD Thesis

Aachen, Techn. Hochsch., Diss., 2012

Abstract

The removal of noxious and air pollutant substances from exhaust gases has become a routine procedure in the glass industry. Nevertheless, process control is still based on empirical data and on the experience of the plant operators. In the past, the occasional and unexpected occurrence of aggressive fluxes in the electrostatic precipitator (e-filters) has troubled several operators. This is unsatisfactory since the occurrence could not be attributed in a clear way to any unfavourable boundary conditions. This thesis presents investigations on the thermodynamic and kinetic conditions in Na2O-H2O-SO2-CO2-N2-containing flue gases below 500°C. Investigations are particularly focused on the formation of liquid and solid sodium pyrosulphates and sodium bisulphates. Special attention is paid to mechanisms of their occurrence and avoidance inside flue gas filters. It is shown that the formation is strongly dependent on the oxygen- and water vapour partial pressure of the system. The measurements will show that many different liquid mixed phases are formed within this system at low water vapour pressures. These phases can be avoided by raising the saturated vapour pressures above 199 mbar.

Institutions

• Division of Materials Science and Engineering [520000]
• Chair of Glass and Glass-ceramic [524210]