EXPERIMENTAL STUDY ON THE EFFECT OF ADDITIVE COMPOSITION ON SLAGGING BEHAVIOR IN A TANGENTIAL BOILER AT COAL POWER PLANT TANJUNG JATI B UNIT 3

• Main Author: Reza Maulana Fasya, Teuku
• Format: Theses
• Language: Indonesia
• Online Access: https://digilib.itb.ac.id/gdl/view/87149
• Institution: Institut Teknologi Bandung

PLTU Tanjung Jati B Unit 3 with a tangential firing boiler, currently consumes coal with a calorific value below its design specification (5618 kcal/kg compared to the specified 5900 kcal/kg). This condition leads to rapid and massive slagging formation, resulting in operational losses of 707,711 MWh in 2023, with financial losses reaching Rp840 billion as reported in the pareto loss analysis. This study aims to mitigate slagging issues by evaluating the effectiveness of additive injection. Two types of additives were tested: Additive A (MgO 42.42%, CaO 51.94%) and Additive B (MgO 95.26%). Additives were injected twice daily for two hours, with a dosage of 200 kg per injection. Parameters analysed included boiler operational performance and bottom ash characteristics through Scanning Electron Microscopy (SEM) and X-ray Diffraction (XRD). These tests aimed to identify changes in bottom ash structure and improvements in melting temperature. The results showed that additive injection positively impacted boiler operational parameters and reduced slagging potential. SEM analysis revealed changes in the ash structure, forming larger particles with higher melting temperature and lower adhesion properties. XRD analysis demonstrated a significant increase in melting temperature, from 1705°C to 1716°C with Additive A and to 1817°C with Additive B. Overall, Additive B provided superior performance in reducing slagging potential in the tangential boiler of Unit 3.