Studi Numerik Pengaruh Co-firing Biomassa pada Elevasi D, E, atau F Terhadap Distribusi Temperatur Flue Gas dan Emisi untuk Pulverized Coal Boiler

Bangun, Laura Joanna Agintha (2024) Studi Numerik Pengaruh Co-firing Biomassa pada Elevasi D, E, atau F Terhadap Distribusi Temperatur Flue Gas dan Emisi untuk Pulverized Coal Boiler. Other thesis, Institut Teknologi Sepuluh Nopember.

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Abstract

Pembangkit Listrik Tenaga Uap (PLTU) menghadapi isu pemusnahan karena penggunaan Batubara dengan coal rank rendah sebagai bahan bakar, yang menyebabkan emisi gas buang tinggi. Biomassa, dengan kandungan volatile matter tinggi dan sulfur rendah menghasilkan emisi gas buang lebih rendah saat terjadi pembakaran. Oleh karena itu, penelitian ini menganalisis penaruh pencampuran Batubara dengan biomassa sawdust serta mengoptimalkan elevasi injeksi co-firing pada Pulverized Coal Boiler. Tugas akhir ini menggunakan software Gambit 2.4.6 dan Ansys Fluent untuk simulasi co-firing pada PC boiler, dengan variasi co-firing sawdust sebesar 5% dan 17% (by energy) pada elevasi burner D, E, dan F. Simulasi ini menghasilkan distribusi temperatur flue gas pada z-center, FEGT, elevasi burner, serta hasil emisi gas di outlet economizer. Hasil penelitian ini menunjukkan peningkatan elevasi injeksi biomassa menurunkan temperatur pembakaran, dengan penurunan 2,26°C pada 5% co-firing dan 3,15°C pada 17% co-firing di area FEGT. Penurunan temperatur disebabkan oleh jarak pembakaran yang semakin menurun akibat peninggian elevasi injeksi. Peningkatan persentase biomassa menurunkan temperatur FEGT sebesar 9°C untuk variasi 5% co-firing dan 6°C untuk variasi 17% co-firing. Hal ini disebabkan karena jumlah partikel yang mengalami delay combustion meningkat. Peningkatan elevasi pengumpanan injeksi biomassa dan persentase biomassa menurunkan gas CO2, SO2, dan NOx sedangkan CO mengalami peningkatan. Penurunan gas Gas CO2 dan CO terjadi sebesar 0,3% untuk 5% co-firing dan 0,82% untuk 17% co-firing sedangkan gas CO meningkat sebesar 0,06% untuk 5% co-firing dan 0,13% untuk 17% co-firing. Penurunan SO2 terjadi sebesar 7% untuk 5% co-firing dan 19,5% untuk 17% co-firing. Penurunan NOx terjadi sebesar 3,5% untuk 5% co-firing dan 9,3% untuk 17% co-firing. Gas SO2 berkaitan dengan kandungan sulfur dan udara pembakaran, dimana biomassa memiliki kandungan sulfur yang lebih rendah dibandingkan batubara. NOx berkaitan dengan temperatur pembakaran, semakin tinggi temperatur, semakin banyak NOx yang terbentuk.
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Power plants are facing the issue of decommissioning, primarily due to the use of low-rank coal as fuel. Low-rank coal is characterized by high exhaust gas emissions. Biomass, with its high volatile matter and low sulfur content, produces lower emissions when co-fired. This study analyzes the effect of mixing coal with biomass sawdust and optimizes the co-firing injection elevation in a Pulverized Coal Boiler. The thesis uses Gambit 2.4.6 and Ansys Fluent software to simulate co-firing in a PC boiler. The study varies sawdust co-firing at 5% and 17% (by energy) with burner elevations D, E, and F. The simulation results include flue gas temperature distribution at z-center, FEGT, burner elevations, and emission outputs at the economizer outlet. The results show that increasing the injection elevation of biomass reduces the combustion temperature by 2.26°C at 5% co-firing and 3.15°C at 17% co-firing in the FEGT area. This temperature decrease is due to reduced combustion distance caused by the higher injection elevation. Increasing biomass percentage lowers the FEGT temperature by 9°C for 5% co-firing and 6°C for 17% co-firing, as more particles experience delayed combustion. Increasing the injection elevation and biomass percentage reduces CO2, SO2, and NOx emissions, while CO emissions increase. CO2 and CO emissions decrease by 0.3% for 5% co-firing and 0.82% for 17% co-firing, while CO increases by 0.06% for 5% co-firing and 0.13% for 17% co-firing. SO2 emissions decrease by 7% for 5% co-firing and 19.5% for 17% co-firing, and NOx emissions decrease by 3.5% for 5% co-firing and 9.3% for 17% co-firing. SO2 emissions are related to sulfur content and combustion air volume, with biomass having significantly lower sulfur content than coal. NOx emissions are related to combustion temperature; higher temperatures produce more NOx.

Item Type:	Thesis (Other)
Uncontrolled Keywords:	Biomass, Co-firing, Elevation, PC boiler, Temperature, Biomassa, Co-firing, Elevasi, PC boiler, Temperatur
Subjects:	T Technology > TJ Mechanical engineering and machinery > TJ263.5 Boilers (general) T Technology > TJ Mechanical engineering and machinery > TJ808 Renewable energy sources. Energy harvesting.
Divisions:	Faculty of Industrial Technology and Systems Engineering (INDSYS) > Mechanical Engineering > 21201-(S1) Undergraduate Thesis
Depositing User:	Laura Joanna Agintha Bangun
Date Deposited:	12 Aug 2024 07:28
Last Modified:	12 Aug 2024 07:28
URI:	http://repository.its.ac.id/id/eprint/114038

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