Study of primary air ratio, coal fineness and excess air to produce boiler efficiency, NPHR and optimal NOx emissions in pulverized coal boiler 200 MW

The combustion process in the boiler is expected to occur perfectly. This will affect the performance of the Net Plant Heat Rate (NPHR) and Boiler Efficiency. Currently, the performance of the Net Plant Heat Rate (NPHR) and Boiler Efficiency is still below the baseline target. The numerical simulation method uses CFD software to estimate the enthalpy value in the boiler nose area and economizer outlet. By knowing the e enthalpy value in the boiler nose area and economizer outlet, the boiler efficiency response and Net Plant Heat Rate (NPHR) can calculate. Then the three parameters will be optimized using ANOVA and Taguchi-Assignment of Weight. The optimization of these three factor parameters was then applied to the generating unit during the Performance Test in May 2022. The results obtained after the performance test were NPHR of 2826.59 kcal/kWh, boiler efficiency of 82.15% and NOx emissions of 269.30 mg/Nm3. After optimization, NPHR decreased by 2.66%, boiler efficiency increased by 1.97% and NOx emissions decreased by 24%.