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Carbon monoxide and nitric oxide concentrations in flue gas during combustion of agricultural biomass in the residental boiler

Pałaszyńska Katarzyna, Juszczak Marek, Ostrowski Ryszard

Drewno : prace naukowe, doniesienia, komunikaty

2021

vol. 64, nr 207

125--144

Concentrations of carbon monoxide and nitric oxide (in mg/m3 and presented for 10% O2) in the flue gas from firing hay and palm kernel shell pellets, as well as a mixture of coffee husk pellets and wood pellets at the weight ratios of 70:30 and 30:70 in a rotary furnace with a 20 kW nominal heat output amounted to: 695.102; 3492.271; 2921.165; 18344.244; 5297.315, respectively, for the boiler operating with minimum heat output, and 568.192; 2400.341; 4065.275; 20696.380 and 2272.123, respectively, for the boiler operating at a heat output close to maximum. The value of carbon monoxide concentration was proportional to the amount of slag generated during the combustion process and the value of nitric oxide concentration was proportional to the nitrogen content in the fuel. Variation of parameters in time: temperature in the combustion chamber, carbon monoxide and nitric oxide concentrations, oxygen concentration and air excess ratio while firing wood and agricultural biomass pellets were indicated. Correlation between nitric oxide and carbon monoxide concentrations as well as carbon monoxide and nitric oxide concentration versus oxygen concentration and temperature in the combustion chamber were presented. Agricultural biomass pellets should be mixed with wood pellets to improve combustion process and reduce carbon monoxide and nitric oxide concentrations. Pollutant concentration measurements were performed in real-life conditions resembling the ones experienced by boiler end-users.

Carbon monoxide and nitric oxide concentrations in the flue gas during the combustion of agricultural biomass briquettes in a 25 kW log gasification boiler

Pałaszyńska Katarzyna, Juszczak Marek, Grobelny Tomasz, Andrzejczak Filip

Drewno : prace naukowe, doniesienia, komunikaty

2019

vol. 62, nr 204

99--114

A study was made of the two-stage combustion of agricultural biomass briquettes (rye straw, miscanthus, hay, corn stover) in a 25 kW wood log gasification boiler. The following correlations for selected fuel loads and biomass types were shown: fluctuation of temperature over time both in the gasification chamber and in the combustion zone, variation over time of carbon monoxide and nitric oxide concentrations, correlation between nitric oxide and carbon monoxide concentrations in the flue gas, and variation of carbon monoxide and nitric oxide concentrations versus oxygen concentration and temperature in the combustion zone. Two-stage combustion of agricultural biomass proved to be efficient, as slag was not generated. Relatively high carbon monoxide concentrations in the flue gas resulted from the lack of automated regulation of air supply to the gasification chamber and the combustion zone.