Design and development of Slotted Stack‑Petal Pot (SSPP) chimney and its performance analysis over conventional chimney

Abstract

The conventional chimney structures commonly used in residences and industries are to uplift the hot flue gases from their heating sources to the outside atmosphere by the ‘Stack effect.’ In particular, industrial chimneys are constructed high in order to dilute the composition of flue gases from the discharge point to the point before reaching the ground. Due to the elevated height, these structures face some major issues like dynamic wind stresses, severe thermal fluctuations, occurrence of negative draft, etc. Despite several control measures available, these issues are yet to be resolved. In this study, a new Slotted Stack-Petal Pot chimney which works on ‘Bernoulli’s principle’ was designed, fabricated and analyzed for its performance over conventional chimney. The performance of lab-scale Slotted Stack-Petal Pot chimney on reduction in temperature and emission of CO, improvement in burning rate of fuel, settlement of PM and, dilution of exhaust gas was analyzed and compared with lab-scale conventional chimney. In addition, the distribution of temperature, and pressure and, the velocity profile for chimney prototypes were simulated using ANSYS (FLUENT) software. It is evident that this newly designed SSPP chimney reduces the flue gas temperature up to 90% and the emission of CO by 74%. It also enhances the burning rate of fuel by 50% and the settling rate of particles by 88% and effectively dilutes the different composition of exhaust gas in lab-scale fabricated models. Furthermore, it avoids the negative draft by equal distribution of pressure and uniform uplift of flue gas in chimney prototypes.