Hotspot Seal Pot Detection of PLTU Teluk Sirih

Abstract

Hotspots are the primary factor causing instability in the sealpots of CFB-type power plants. This occurs due to cracks in the refractory, material bed accumulation, or material entrapment within the refractory. The presence of hotspots has a negative impact on boiler performance and increases the load.

According to API 936 standards, temperatures above 200°C can lead to hotspots, which cannot be prevented at that temperature. To avoid hotspots, it is necessary to replace the refractory with appropriate new materials and ensure proper installation to prevent thermal leaks.

Out of the 44 measurement points conducted in Unit 1 on the two sealpots of the boiler, only 6 points were found to be in normal condition, while the remaining 5 points experienced hotspots. This condition is highly dangerous as the temperature exceeds 200°C, and the abnormal conditions at those points need to be addressed promptly.