De-Nox Kits - Incineration Filtration Systems
The Addfield De-NOx systems involves the use of Urea – a common, widely available harmless fertiliser to neutralise nitrogen oxides (NOx) formation. NOx is widely problematic in coal plants and diesel vehicles and similarly more commonly found in high capacity diesel incineration plants.
Urea granules are dissolved in water and the resulting solution is injected directly into a separate chamber, post secondary after chamber combustion. The optimum flue gas temperature for injection is a 950°C, if the system operates at lower temperature or operates efficiency NOx emissions can actually increase. As such this chamber is temperature controlled and must remain in the window between 980°C and 830°C with a gas retention time not lower than 0.5 seconds.
This NOx removal process is known as selective not-catalytic reduction (SNCR). The process of nitrogen oxides removal using urea as a reagent in an aqueous solution (water and urea) injected into hot flue gases creates the post-combustion reactions:
NH2CONH2 + 2 NO + ½ O2 → 2 N2 + CO2 + 2 H2O
This system is an extremely cost effective way of controlling NOx with 1T of urea is typically costing between $220-$300USD (£140-£200) allowing for 620 hours of operation (Machine dependant).