Penilaian Numerik terhadap Rasio Co-Firing Ammonia-Batubara dan Efek pada Air-Staging terhadap Kinerja Pembakaran dan Penurunan Emisi

Alamsyah, Dimas Fattah Razzaq (2024) Penilaian Numerik terhadap Rasio Co-Firing Ammonia-Batubara dan Efek pada Air-Staging terhadap Kinerja Pembakaran dan Penurunan Emisi. Other thesis, Institut Teknologi Sepuluh Nopember.

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Abstract

Penelitian ini berfokus pada potensi penggunaan amonia sebagai bahan bakar netral karbon. Penentuan potensi amonia sebagai bahan bakar di pembangkit listrik berbahan bakar batubara bertujuan untuk mengurangi emisi yang dihasilkan dari proses tersebut. Amonia dikategorikan sebagai bahan bakar netral karbon karena komposisi kimianya (NH3) tidak mengandung satu pun molekul karbon. Memahami potensi amonia sebagai bahan bakar di pembangkit listrik mendukung deklarasi internasional tentang Emisi Net-Zero di setiap sektor. Penelitian ini secara khusus menganalisis penggunaan amonia di pembangkit listrik berbahan bakar batubara melalui penilaian numerik komputasi. Penelitian ini bertujuan untuk menentukan efek pembakaran bersama amonia-batubara pada tiga aspek, yaitu karakteristik pembakaran (seperti suhu, kecepatan, perpindahan panas, dll), distribusi spesies emisi dalam gas buang, dan efisiensi keseluruhan pembangkit listrik. Penelitian dilakukan menggunakan simulasi 3D Computational Fluid Dynamics dengan ANSYS FLUENT, berdasarkan kondisi nyata dari Pembangkit Listrik Tanjung Awar-Awar. Simulasi dilakukan dari gambar 3D geometri boiler Tanjung Awar-Awar yang diatur dalam 2.070.305 node mesh dari persiapan simulasi. Lima rasio pembakaran bersama NH3 (0%, 20%, 40%, 60%, 80%) dan lima rasio SOFA (4%, 8%, 16%, 20%, 24%) disimulasikan. Hasil menunjukkan bahwa peningkatan pembakaran bersama NH3 secara signifikan mengurangi Suhu Gas Keluar Boiler sekitar 130 K dan menggeser nyala api pembakaran ke tengah furnace, meningkatkan magnitudo kecepatan karena kebutuhan oksigen yang lebih tinggi untuk pembakaran sempurna. Penyesuaian rasio SOFA sedikit mempengaruhi suhu, dengan peningkatan 70 K saat mengurangi SOFA menjadi 4% dan penurunan 30 K saat meningkatkan SOFA. Pembakaran bersama NH3 meningkatkan pembentukan H2O dan, bersama dengan variasi rasio SOFA, secara signifikan mengurangi emisi CO, CO2, dan NOx. Secara khusus, pembakaran bersama NH3 mengurangi NOx sekitar 70%, sedangkan peningkatan rasio SOFA mengurangi NOx sekitar 5%. Efisiensi pembakaran menurun dari 86,71% menjadi 69,07% dengan pembakaran bersama NH3 yang lebih tinggi karena nilai kalor amonia yang lebih rendah, sementara peningkatan rasio SOFA sedikit meningkatkan efisiensi dari 78,65% menjadi 79,09%.
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This research focused on the potential use of ammonia as carbon neutral fuel. Determining the potential of ammonia as fuel in a coal fired plant to reduce the amount of emission generated from the process. Since ammonia is categorized as a carbon neutral fuel which means the chemical composition of ammonia (NH3) does not contain any single molecule of carbon. Understanding the potential of ammonia in the use as fuel in power plant supports the international declaration of Net-Zero Emission from every sector. This research specifically analyze the use of ammonia in coal-fired power plant in a computational numerical assessment. The research aims to determine the effect of ammonia-coal co-firing on three subject which are, the combustion characteristics (such as temperature, velocity, heat transfer and etc), the species distribution of emission in flue gas, and overall power plant efficiency. The research is done using 3D Computational Fluid Dynamics simulation using ANSYS FLUENT, based on the real condition of Tanjung Awar-Awar Power Plant. The simulation is done from 3D drawing of Tanjung Awar-Awar boiler geometry set in 2070305 nodes of mesh from the simulation preparation. Five NH3 co-firing ratios (0%, 20%, 40%, 60%, 80%) and five SOFA ratios (4%, 8%, 16%, 20%, 24%) were simulated. Results indicate that increasing NH3 co-firing significantly reduces the Furnace Exit Gas Temperature by about 130 K and shifts the combustion flame towards the furnace center, increasing velocity magnitude due to higher oxygen demand for complete combustion. SOFA ratio adjustments slightly impact temperature, with a 70 K increase when reducing SOFA to 4% and a 30 K decrease when increasing SOFA. NH3 co-firing increases H2O formation and, along with SOFA ratio variations, significantly reduces CO, CO2, and NOx emissions. Specifically, NH3 co-firing reduces NOx by about 70%, while increased SOFA ratios reduce NOx by about 5%. Combustion efficiency decreases from 86,71% to 69,07% with higher NH3 co-firing due to ammonia's lower calorific value, while increasing SOFA ratios slightly improve efficiency from 78,65% to 79,09%.

Item Type:	Thesis (Other)
Uncontrolled Keywords:	Amonia, Pembangkit Tenaga, Co-firing, Separated Over-fired Air Ammonia, Power Plant, Co-firing, Separated Over-fired Air
Subjects:	T Technology > TJ Mechanical engineering and machinery > TJ164 Power plants--Design and construction T Technology > TJ Mechanical engineering and machinery > TJ254.7 Combustion chambers T Technology > TJ Mechanical engineering and machinery > TJ808 Renewable energy sources. Energy harvesting.
Divisions:	Faculty of Industrial Technology > Mechanical Engineering > 21201-(S1) Undergraduate Thesis
Depositing User:	Dimas Fattah Razzaq Alamsyah
Date Deposited:	12 Aug 2024 03:50
Last Modified:	12 Aug 2024 03:50
URI:	http://repository.its.ac.id/id/eprint/113324

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