Abstract
A pilot-scale low-emission boiler system consisting of a bio-fuel boiler and a plasma-chemical hybrid NOx removal system is investigated. This system can achieve carbon neutrality because the bio-fuel boiler uses waste vegetable oil (WVO) as one of the fuels. The plasma-chemical hybrid NOx removal system has two processes: NO oxidation by ozone produced from plasma ozonizers and NO2 removal using a Na2SO3 chemical scrubber. Test demonstrations of the system were carried out for mixed oils (mixture of heavy oil and WVO). A stable combustion was achieved for the mixed oil (20%-50% WVO). The properties of flue gas-e.g., O2, CO2, and NOx -when firing mixed oils were nearly the same as those when firing heavy oil for an average flue gas flow rate of 1000 Nm3/h. The NOx concentrations at the boiler outlet were 90-95 ppm. Furthermore, during a 300-min continuous operation when firing 20% mixed oil, a NOx removal efficiency of more than 90% was confirmed. This is equivalent to less than 10 ppm at the scrubber outlet when the flue gas flow rate was 870 Nm3/h. In addition, CO2 reduction when heavy oil was replaced with WVO was estimated. The system comparison is described between the plasma-chemical hybrid NOx removal and the conventional NOx removal.
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