The six boilers of the power plant of Indonesia Bintan Alumina Co., Ltd. were put into operation from March 2021 to July 2023. After the boilers were put into operation, it was found that the exhaust gas temperature was generally high. After continuous long-term operation, the exhaust gas temperature was close to 180°C, which directly affected the safe and stable operation of the desulfurization system, and also reduced the boiler efficiency, resulting in an increase in production costs and reducing the economic efficiency of the park production line.

Because the boiler has been operating at a low load, the flue gas velocity of the economizer will also decrease synchronously. In addition, the actual coal quality deviates greatly from the designed coal quality, and the fly ash from coal gasification has been mixed. Although the temperature is temporarily controllable, it has remained high.

In response to the problem of high boiler exhaust temperature, the boiler workshop contacted the West China Boiler Design Institute from October 2022 to the end of May 2023 to re-calculate the thermal power and analyze the reasons, and simultaneously coordinated the pulverizing system equipment manufacturer and air preheater manufacturer for comprehensive verification and analysis. Finally, with the approval of the company's leaders, the plan of installing a steam soot blower on the boiler economizer was adopted for testing, and the drawings were issued at the end of May to start calculating the engineering quantity and submitting the equipment material procurement plan and installation unit quotation inquiry. On November 15, 2023, the project of installing 8 steam soot blowing systems on the economizer of boiler #2 was completed and started. The exhaust temperature of the full-load test dropped from 175-190℃ (the desulfurization system was not fully put into operation before August 6, 2024) to about 145-155℃. The energy-saving effect after the transformation was very successful.