Optimasi Efisiensi Boiler, NPHR dan Emisi NOx Pada Pulverized Coal Boiler 200 MW

Wasisto, Handoyo Widhy (2022) Optimasi Efisiensi Boiler, NPHR dan Emisi NOx Pada Pulverized Coal Boiler 200 MW. Masters thesis, Institut Teknologi Sepuluh Nopember.

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Abstract

Untuk mendukung program peningkatan kinerja pembangkit, khususnya dibidang efisiensi pembangkit, dilakukan kegiatan monitoring performance peralatan-peralatan utama pembangkit. Salah satu peralatan utama yang dimonitoring performancenya adalah boiler. Proses pembakaran di dalam boiler diharapkan terjadi dengan sempurna. Performance boiler yang optimal dapat dicapai dengan memaksimalkan proses pembakaran di dalam boiler. Hal ini akan mempengaruhi performance Net Plant Heat Rate (NPHR), Boiler Efisiensi dan emisi NOx. Saat ini performance Net Plant Heat Rate (NPHR) dan Boiler Efisiensi masih dibawah target baseline first year inspection. Metode simulasi numerik menggunakan software CFD (Computational Fluid Dynamic) untuk mengestimasi nilai Enthalpy pada area nose boiler dan outlet economizer. Dengan mengetahui nilai Enthalpy pada area nose boiler dan outlet economizer, respon boiler efisiensi dan Net Plant Heat Rate (NPHR) dapat dihitung. Primary Air Ratio, Coal Fineness dan Excess Air merupakan parameter yang akan dilakukan optimasi. Ketiga parameter tersebut akan dioptimasi menggunakan ANOVA dan Taguchi-Assignment of Weight. Nilai prediksi respon adalah 325,833 dan masuk kedalam selang kepercayaan 325,8194 ≤ μconfirmation ≤ 325,9364 sehingga nilai prediksi respon optimal masuk dalam interval selang kepercayaan. Oleh karena itu dapat disimpulkan bahwa rancangan telah memenuhi persyaratan dalam eksperimen Taguchi. Nilai optimal ketiga parameter tersebut kemudian diterapkan di Unit Pembangkit saat melakukan performance test sebagai validasi. Hasil yang diperoleh setelah dilakukan performance test pada bulan Mei 2022 adalah NPHR sebesar 2826.59 kcal/kWh, efisiensi boiler sebesar 82.15% dan Emisi NOx sebesar 269,30 mg/Nm3. Setelah dilakukan optimasi pada Primary Air Ratio di 1:2,45, Coal Fineness 60% serta Excess Air 15%, NPHR mengalami penurunan 2,66%, efisiensi boiler mengalami kenaikan sebesar 1,97% dan emisi NOx turun sebesar 24%.
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To support the improvement program of power plant performance, expecially in the power plant efficiency, performance of the main power plant equipment monitoring is carried out. One of the main equipment whose performance is monitored is the boiler. The combustion process in the boiler is expected to occur perfectly. Optimal boiler performance can be achieved by maximizing the combustion process in the boiler. This will affect the performance of Net Plant Heat Rate (NPHR), Boiler Efficiency and NOx emissions. Currently, the performance of the Net Plant Heat Rate (NPHR) and Boiler Efficiency is still below the baseline of first year inspection target. The numerical simulation method uses CFD Computational Fluid Dynamic) software to estimate the Enthalpy value in the boiler nose area and economizer outlet. By knowing the Enthalpy value in the boiler nose area and economizer outlet, the boiler response efficiency and Net Plant Heat Rate (NPHR) can be calculated. Primary Air Ratio, Coal Fineness and Excess Air are parameters that will be optimized. These three parameters will be optimized using ANOVA and Taguchi-Assignment of Weight. The predicted response value is 325,833 and it is between the confidence interval of 325,8194 ≤ μconfirmation ≤ 325,9364 so that the optimal response prediction value is included in the interval. Therefore, it can be concluded that the design has met the equirements of the Taguchi experiment. The optimal values for these three parameters are then applied to the Generating Unit when performing a performance test as validation. The results obtained after the performance test in May 2022 were NPHR of 2826,59 kcal/kWh, boiler efficiency of 82,15% and NOx emissions of 269,30 mg/Nm3. After optimizing the Primary Air Ratio at 1:2,45, Coal Fineness 60% and Excess Air 15%, NPHR decreased by 2,66%, boiler efficiency increased by 1,97% and NOx emissions decreased by 24%.

Item Type:	Thesis (Masters)
Additional Information:	RTM 621.183 Was o-1 2022
Uncontrolled Keywords:	Boiler Efisiensi, NPHR, NOx, Taguchi, Assignment of Weight Boiler Efficiency
Subjects:	T Technology > TJ Mechanical engineering and machinery > TJ263.5 Boilers (general)
Divisions:	Faculty of Industrial Technology and Systems Engineering (INDSYS) > Mechanical Engineering > 21101-(S2) Master Thesis
Depositing User:	Mr. Marsudiyana -
Date Deposited:	12 Feb 2025 06:24
Last Modified:	12 Feb 2025 06:24
URI:	http://repository.its.ac.id/id/eprint/118689

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