Preliminary study of hot air generator: a measure of gas emissions and temperatures

Abstract

Combustion tests were conducted with peanut shells and biochar briquettes of peanut shells to examine emissions gas and air temperature at the outlet of a heat exchanger, in an indirect hot air generator. Gas emissions were monitored using the RASI700Bio analyzer. Temperatures were recorded using Arduino data acquisition. For peanut shells five (05) kilograms were burned in the combustion chamber with an open door and closed door. Average emissions of CO and NOx were 1585.59 and 66.34 mg/m3, respectively for combustion with an open door. For combustion with a closed door, average emissions of CO were 12625.93 mg / m3 and those of NOx were 139.91 mg/m3. Air temperatures at the outlet of the heat exchanger were 98.25 and 122.25° C, respectively for combustion with an open door and closed door. For the biochar briquettes, five kilograms were also burned in the combustion chamber with an open door and closed door. Average emissions of CO and NOI were 1762.74 and 40.21 mg/m3, respectively for combustion with an open door. For combustion with a closed door, average emissions of CO were 1915.66 mg/m3 and for those of NOx, we obtained 62.02 mg/m3. Air temperatures at the outlet of the heat exchanger were 78.25 and 89.25°C, respectively for combustion with an open door and closed door. Combustion of the biochar briquettes produced higher CO and lower NOx emissions in the open door, compared to those of peanut shells. In closed-door, combustion of the biochar briquettes produced lower CO and lower NOx emissions, compared to those of peanut shells.