Process for the selective, non-catalytic reduction of the emissions from oil fired boiler plants

摘要

In this process for selective non-catalytic reduction of the pollutant emission from oil-fired boiler plants, chemical compounds affecting the combustion process are added to the liquid fuel or to the combustion air, including salts of organic acids, such as naphthenates, octoates and tallates, sulphonic acid salts, salts of saturated or unsaturated fatty acids, oleic acids, tall oil with metals from the group comprising K, Ba, Mg, Ca, Ce, Mn, Fe and rare earth metals, organometal compounds such as carbonyl compounds, mixed cyclopentadienyl-carbonyl compounds or aromatics complexes of the transition metals Fe or Mn in solutions miscible with the liquid fuel. To minimise the NOx values in the waste gas and the dust loading, coupled with economical chemicals consumption, a reducing agent is added to the firing chamber (burner chamber) via a boiler-dosing system, using a liquid or also gaseous carrier stream, as an aqueous solution of urea or also urea precursors such as ammonia or ammonium carbonate, which can also contain further constituents such as alkanols, alkanecarboxylic acids, alkanals or alkanones.