Hasudungan, Herbert (2023) Studi Numerik Pengaruh Variasi Temperatur Inlet dan Primary Air to Coal Ratio terhadap Karakteristik Coal Pulverizer Mill secara 3D dengan Software Ansys Fluent. Other thesis, Institut Teknologi Sepuluh Nopember.
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02111940000088_HERBERT HASUDUNGAN_TUGAS AKHIR.pdf - Accepted Version Restricted to Repository staff only until 1 October 2025. Download (7MB) | Request a copy |
Abstract
Batubara masih menjadi pemasok dan penyedia energi di Indonesia, namun ketersediaan batubara saat ini diantaranya 90,74% berkalori rendah sehingga termasuk low rank coal contohnya lignite dan bituminous. Pada umumnya, desain boiler pada Pembangkit Listrik Tenaga Uap (PLTU) membutuhkan batubara kalori tinggi sekitar 2-15% karena memiliki high heating value. Oleh karena itu, besar kemungkinan coal pulverizer mill harus dioperasikan standby setiap saat tanpa ada perbaikan atau maintenance. Hal tersebut dapat mengakibatkan terhambatnya kinerja proses dari PLTU sehingga dapat mengalami kerugian yang besar. Selain itu, dapat terjadi kenaikan akan kerusakan serta pencemaran lingkungan karena PLTU menggunakan batubara jenis low rank yang lebih banyak dibandingkan batubara high atau medium rank. Maka dari itu, teknologi coal mill pulverizer harus dioptimalkan secara baik agar dapat menurunkan kandungan air dari batubara sehingga menaikkan nilai kalornya. Kandungan volatile matter yang tinggi pada batubara berjenis Low Rank Coal (LRC) dapat menyebabkan batubara tersebut mudah terbakar sendiri secara spontan (spontaneous combustion). Oleh sebab itu, penambahan temperatur udara primer dan laju massa harus dilakukan secara optimal. Penelitian ini bertujuan untuk mengetahui pengaruh temperatur fluidisasi inlet terhadap karakteristik pengeringan pada coal pulverizer mill. Temperatur udara primer yang dianalisis divariasikan pada nilai sebesar 166.1°C, 174.85°C, dan 189..85°C, juga untuk mass fow rate dari primary air to coal ratio sebesar 1.8:1 , 1.9:1 , dan 2.1:1. Hal tersebut juga diteliti lebih lanjut mengenai hubungan antara pengaruh dari temperatur fluidisasi inlet terhadap terjadinya peristiwa spontaneous combustion pada batubara di dalam coal pulverizer mill. Hasil dari penelitian ini dari simulasi yang telah dilakukan dengan mass flow yang tetap pada 21.036 kg/s diperoleh bahwa temperatur udara primer untuk nilai 166.1°C menghasilkan mill outlet temperature (MOT) sebesar 58.03°C dan moisture content batubara sebesar 27.65%, untuk nilai 174.85°C menghasilkan mill outlet temperature (MOT) sebesar 62.19°C dan moisture content batubara sebesar 27.36%, untuk nilai 189.85°C menghasilkan mill outlet temperature (MOT) sebesar 74.07°C dan moisture content batubara sebesar 27.27%. Sedangkan dengan temperatur udara primer tetap pada 166.1°C diperoleh bahwa untuk nilai mass flow 22 kg/s menghasilkan mill outlet temperature (MOT) sebesar 62.07°C dan moisture content batubara sebesar 27.25%, dan untuk nilai mass flow 24.026 kg/s menghasilkan mill outlet temperature (MOT) sebesar 62.23°C dan moisture content batubara sebesar 26.50%.
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Coal includes 90.74% low calorie so that it includes low rank coal, for example lignite and bituminous. In general, boiler design in Steam Power Plants (PLTU) requires high calorie coal around 2-15% because it has a high heating value. Therefore, it is likely that the coal pulverizer mill must be operated standby at all times without any repair or maintenance. This can result in obstruction of the process performance of the PLTU so that it can experience large losses. In addition, there can be an increase in damage and environmental pollution because the PLTU uses more low rank coal than high or medium run coal. Therefore, coal mill pulverizer technology must be well optimized in order to reduce the water content of coal so as to increase its heating value. The high volatile matter content in Low Rank Coal (LRC) can cause the coal to spontaneously combust. Therefore, the addition of primary air temperature must be done optimally. This study aims to determine the effect of inlet fluidization temperature on the drying characteristics of coal pulverizer mill. The primary air temperature analyzed was varied at values of 166.1°C, 174.85°C, and 189..85°C, as well as for the mass fow rate from primary air to coal ratio in the amount of 1.8:1 , 1.9:1 , and 2.1:1. It was also further investigated regarding the relationship between the effect of inlet fluidization temperature on the occurrence of spontaneous combustion events on coal in the coal pulverizer mill. The results of this research from the simulations conducted with a constant mass flow of 21.036 kg/s show that the primary air temperature at 166.1°C produces a mill outlet temperature (MOT) of 58.03°C and a coal moisture content of 27.65%. At a temperature value of 174.85°C, the mill outlet temperature (MOT) obtained is 62.19°C with a coal moisture content of 27.36%. Finally, at a temperature value of 189.85°C, the mill outlet temperature (MOT) obtained is 74.07°C with a coal moisture content of 27.27%. Meanwhile, with the primary air temperature held constant at 166.1°C, it was found that a mass flow value of 22 kg/s results in a mill outlet temperature (MOT) of 62.07°C and a coal moisture content of 27.25%, and for a mass flow value of 24.026 kg/s, the mill outlet temperature (MOT) obtained is 62.23°C with a coal moisture content of 26.50%.
| Item Type: | Thesis (Other) |
|---|---|
| Uncontrolled Keywords: | Coal, Primary Air, Coal Pulverizer Mill, Temperature, Moisture Content, Batubara, Temperatur. |
| Subjects: | Q Science > QC Physics > QC320 Heat transfer |
| Divisions: | Faculty of Industrial Technology and Systems Engineering (INDSYS) > Mechanical Engineering > 21201-(S1) Undergraduate Thesis |
| Depositing User: | Herbert Hasudungan |
| Date Deposited: | 09 Aug 2023 08:07 |
| Last Modified: | 09 Aug 2023 08:07 |
| URI: | http://repository.its.ac.id/id/eprint/103611 |
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