Mollo M.S., Kolesnikov A.V., Makgato S.S., 2023, Effect of Isokinetic Sampling on Combustion Airflow and Heat Energy Produced in 600 Mw Coal-Fired Boiler, Chemical Engineering Transactions, 99, 229-234.
The focus of this research is to study the effect of isokinetic sampling of the secondary airflow on the energy input to the fuel-fired boiler. The relocation of the secondary airflow test ports from horizontal to vertical transverse sampling was implemented after the observation that the airflow in the duct was not constant. Additionally, the methods are used to ensure that the airflow particle inlet velocity to the sampling nozzle is the same as the duct velocity. The pressure was measured using the S-type pitot tube on four boiler levels at the full load capacity of the boiler. At 100% fuel-fired boiler capacity, the energy equation accurately projected the kinetics of pressure drop. It was established that the decrease in pressure results in increased airflow. The continuity principle supports the claim that these outcomes are due to the secondary air's increased velocity as it passes through the constricted duct area, which causes a decrease in pressure. These findings improve our understanding of how isokinetic sampling affects combustion airflow and heat energy, which can guide its future application in coal-fired boilers.
