Abstract
The majority of power plants in Indonesia are Coal-Fired Power Plants (PLTU) which using coal as the main fuel. The coal used in the PLTU is coal that has been adjusted to the existing PLTU design. However, coal availability according to the initial design of the PLTU is running low and even almost non-existent. If the coal does not meet the PLTU design specifications is forced to be used as fuel, various problems will arise regarding to the capability and reliability of the power plant itself. Therefore, looking for coal alternatives that have similar specifications to the PLTU design is very important, to get these alternatives can be done by Blending coal from various specifications. The Blending product must be evaluated from various aspects, one of which is slagging and fouling. This research will focus on the aspects of slagging fouling resulting from the Blending of two different coals in terms of characteristics and specifications. Evaluation is carried out by taking samples and tested to make predictions based on AAS and AFT, burning in the Drop Tube Furnace (DTF), and performing SEM and XRD analysis of two coal Blending products. The results obtained are that the A and B Blending products are in an acceptable risk for direct testing on a larger scale (PLTU) or boiler simulator. However, Blending A has a greater potential for further research than Blending product B.
Highlights
The coal used in the Pembangkit Listrik Tenaga Uap (PLTU) is coal
that has been adjusted to the existing PLTU design
coal availability according to the initial design of the PLTU is running low
Summary
Pembangkit listrik di Indonesia kebanyakan adalah pembangkit berbahan bakar batubara 1. Untuk memenuhi kebutuhan tersebut maka perlu dilakukan Blending diantara dua batubara atau lebih agar diperoleh batubara yang sesuai dengan spesifikasi pembangkit 2. Potensi slagging dan fouling ini paling banyak ditentukan oleh komposisi bahan bakar disamping hal lainnya 3. Pada batubara produk Blending ini sifat AFT tidak linier dengan batubara penyusunnya 4. Vuthaluru 5 telah membuktikan dengan melakukan Blending antara batubara lignite dan bituminous dapat memperbaiki sifat slagging fouling. Metode lain untuk mengetahui karakteristik dari batubara adalah dengan melakukan pembakaran batubara dalam tungku atau boiler 7. Salah satu instrumen untuk melakukan uji pembakaran batubara adalah dengan menggunakan Drop Tube Furnace (DTF). Uji bakar dengan menggunakan DTF dilakukan dengan kondisi yang sangat mirip dengan kondisi boiler pada PLTU, dimana parameter terkait pembakaran diatur sedemikian rupa. Hasil pembakaran pada tungku DTF ini telah banyak diterima oleh stockholder yang ada di PLTU
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