Studi Pengaruh Rasio Co-Firing Bahan Bakar Batubara Dan Biomassa Tertorefaksi Terhadap Performa PLTU Sulsel Barru Unit-2

Tampubolon, Gerald Nicholaus Pardamean (2023) Studi Pengaruh Rasio Co-Firing Bahan Bakar Batubara Dan Biomassa Tertorefaksi Terhadap Performa PLTU Sulsel Barru Unit-2. Other thesis, Institut Teknologi Sepuluh Nopember.

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Abstract

Co-firing merupakan salah satu cara untuk mengurangi penggunaan bahan bakar fosil (batubara) diganti dengan biomassa. Akan tetapi co-firing dapat menyebabkan penurunan performa pada pembangkit. Salah satu cara untuk menanggulangi permasalahan ini adalah dengan menggunakan biomassa yang telah diolah terlebih dahulu lewat proses heat-treatment yaitu biomassa tertorefaksi. Pada penelitian ini analisa pengaruh biomassa tertorefaksi terhadap performa pembangkit dengan menggunakan Cycle Tempo. Variasi yang dilakukan adalah rasio batubara low rank coal dengan biomassa. Biomassa yang digunakan ada empat; dua merupakan biomassa non-torefaksi (sawdust dan coconut shell) dan biomassa tertorefaksi (torrefied sawdust dan coconut charcoal). Penelitian ini dilakukan dengan variasi biomassa berupa 1%, 3%, 5%, 7%. Untuk menghasilkan pembakaran yang sempurna, nilai air feed rate (AFR) harus disesuaikan dengan nilai carbonnya. Nilai air feed rate juga dipengaruhi oleh volatile matter (VM), dimana semakin sedikit nilai VM, maka nilai air feed rate yang dibutuhkan semakin besar ataupun sebaliknya. Hasil penelitian menunjukkan bahwa, peningkatan tertinggi AFR ditunjukkan pada rasio cofiring 7% dengan nilai peningkatan sebesar 1.65% pada torrefied sawdust dan 5.62% pada coconut charcoal. Nilai high heating value (HHV) biomassa tertorefaksi tinggi sehingga menghasilkan temperature yang besar yang memungkinkan untuk menurunkan jumlah pasokan bahan bakar karena boiler lebih efisien. Penurunan terbesar fuel feed rate ditunjukkan pada rasio cofiring 7% dengan nilai penurunan sebesar 2% pada torrefied sawdust dan 5.21% pada coconut charcoal. Boiler yang effisiensinya lebih tinggi meningkatkan efisiensi pembangkit sehingga memungkinkan implementasi co-firing pada rasio yang lebih tinggi Peningkatan efisiensi tertinggi ditunjukkan pada rasio cofiring 7% dengan nilai 85.18% untuk torrefied sawdust, 85.51% untuk coconut charcoal yang sebelumnya bernilai 85.03%. Peningkatan NPHR tertinggi ditunjukkan pada rasio cofiring 7% dengan nilai 2167.98 untuk torrefied sawdust, 2159.6 untuk coconut charcoal yang sebelumnya bernilai 2171.66.
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Co-firing is one of the methods to reduce the use of fossil fuels (such as coal) by replacing them with biomass. However, co-firing can lead to a decrease in power plant performance. One way to address this issue is by using pre-treated biomass through a heat-treatment process known as torrefaction. In this research, the analysis focuses on the effect of torrefied biomass on power plant performance using the Cycle Tempo method. The variations tested involve the ratio of low-rank coal to biomass. Four types of biomasses were used, two of which were non-torrefied biomass (sawdust and coconut shell) and two were torrefied biomass (torrefied sawdust and coconut charcoal). The study was conducted with biomass ratios of 1%, 3%, 5%, and 7%. To achieve optimal combustion, the air feed rate (AFR) must be adjusted according to its carbon content. The AFR value is also influenced by the volatile matter (VM) content, where lower VM values require a higher AFR, and vice versa. The results of the research showed that the highest increase in AFR occurred at a 7% co-firing ratio, with an increase of 1.65% for torrefied sawdust and 5.62% for coconut charcoal. The high heating value (HHV) of torrefied biomass is high, resulting in higher temperatures, allowing for a reduction in fuel supply as the boiler becomes more efficient. The largest decrease in fuel feed rate was observed at a 7% co-firing ratio, with a decrease of 2% for torrefied sawdust and 5.21% for coconut charcoal. The increased efficiency of the boiler enhances power plant efficiency, making it possible to implement co-firing at higher ratios. The highest increase in efficiency was observed at a 7% co-firing ratio, with values of 85.18% for torrefied sawdust (compared to the previous value of 85.03%) and 85.51% for coconut charcoal (compared to the previous value of 85.03%). The highest increase in Net Plant Heat Rate (NPHR) was also seen at a 7% co-firing ratio, with values of 2167.98 for torrefied sawdust (compared to the previous value of 2171.66) and 2159.6 for coconut charcoal.

Item Type:	Thesis (Other)
Uncontrolled Keywords:	Biomassa, Co-firing, Torefaksi, Biomass, Co-firing, Torrefied
Subjects:	T Technology > TJ Mechanical engineering and machinery T Technology > TJ Mechanical engineering and machinery > TJ164 Power plants--Design and construction T Technology > TJ Mechanical engineering and machinery > TJ263 Heat exchangers T Technology > TJ Mechanical engineering and machinery > TJ263.5 Boilers (general) T Technology > TJ Mechanical engineering and machinery > TJ265.E23 Thermodynamics. 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:	Gerald Nicholaus Pardamean Tampubolon
Date Deposited:	28 Aug 2023 07:34
Last Modified:	28 Aug 2023 07:34
URI:	http://repository.its.ac.id/id/eprint/102627

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