Experimentally Study the Temperature Profile in the Plume Chimney above a Natural Draft Chimney Model

Abstract

The chimney holds a central position in the industry, as the efficiency of the stack directly impacts the industry's overall performance. The presence of a real plume at the chimney exit indicates that the chimney is in draft-free operation. This study uses the temperature profile to detect a plume at the chimney's exit. To conduct experiments, the project entails designing and fabricating models for three distinct model chimneys. We modify the models by adding a wire mesh screen to face areas of 0.56 m², 1.00 m², and 2.25 m². This protects the cold inflow at the top to ensure the cold-inflow-free operation of the chimney. K-type thermocouples, linked to a data logger and a computer, measure the temperatures at the exit points and above them. The experimental results show that a wire mesh screen covering the chimney has established an effective plume at the chimney exit. Theoretically, we calculate the maximum effective plume height as 0.27 m above the chimney face, which allows us to measure the temperature up to 0.27 m on the vertical axis (y-axis). Industries, where waste heat rejection from the system is an important task, can use this information to develop an effective natural draft chimney.