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All Journal Jurnal Teknik Mesin AL-JAZARI JURNAL ILMIAH TEKNIK MESIN International Journal of Renewable Energy Development
sobar ihsan, sobar
Fakultas Teknik,Universitas Islam Kalimantan MAB
Aerospace Engineering Automotive Engineering Chemical Engineering, Chemistry & Bioengineering Control & Systems Engineering Earth & Planetary Sciences Electrical & Electronics Engineering Energy Engineering Mechanical Engineering

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ANALISIS VARIABEL-VARIABEL PENENTU CLEANLINESS FACTOR DAN PERFORMANCE FACTOR UNTUK MENINGKATKAN KINERJA KONDENSOR UNIT 1 PLTU SEKTOR ASAM-ASAM Ashar, Muhammad; Ihsan, Sobar; ,, Irfan; Ramadhan, Slamet
AL-JAZARI JURNAL ILMIAH TEKNIK MESIN Vol 3, No 2 (2018)
Publisher : AL-JAZARI JURNAL ILMIAH TEKNIK MESIN

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (28.041 KB)

Abstract

Pemanatauan kierja kondensor PT. PLN Persero Sektor Asam-Asam pada keadaan operasi membuthkan nilai Cleanliness Factor dan Performance Factor. Analisis variabel-variabel yang menentukan Clinelines Factor dan Performance Factor diperlukan agar kinerjanya dapat ditingkatkan. Penelitian ini bertujuan untuk mendapatkan nilai Cleanlines Factor dan Performance Factor, mengetahui pengaruh perubahan beban terhadap Cleanlines Factor dan Performance Factor, mengetahui variabel-variabel mempengaruhi kinerja kondenser dan mencari solusi untuk meningkatkan performance kondensor. Nilai Cleanlines Factor didapatkan dari rasio perbandingan koefisien transfer panas total keadaan aktual terhadap koefisien transfer panas HEI sedangkan PF didapat dari rasio koefisien transfer panas total keadaan aktual terhadap koefisien transfer panas ASME. Data-data operasi menunjukkan bahwa nilai Cleanlines Factor dan Performance Factor meningkat seiring dengan meningkatnya beban pembangkitan listrik. . Hal ini membuktikan bahwa fouling bukan penyebab rendahnya nilai Cleanlines Factor dan Performance Factor. Variabel-variabel yang dianalisis yaitu suhu inlet cooling water (Tin), tekanan kondenser/back pressure (Pback) dan aliran volumetrik cooling water (Colling Water flow).
KAJIAN TEORITIS PERENCANAAN BOILER PIPA API PADA USAHA KECIL VULKANISIR ihsan, sobar
Jurnal Teknik Mesin (Journal Of Mechanical Engineering) Vol 8, No 1 (2019)
Publisher : Universitas Mercu Buana

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22441/jtm.v8i1.5400

Abstract

Boiler atau ketel uap adalah suatu alat berbentuk bejana tertutup yang digunakan untuk menghasilkan uap. Uap diperoleh dengan memanaskan bejana yang berisi air dengan bahan bakar. Uap air adalah sejenis fluida yang merupakan fase gas dari air. Penelitian ini bertujuan untuk merancang kontruksi boiler jenis Vertical fire tube boiler dengan kapasitas 150 kg/jam menghasilkan uap jenuh pada temperatur 150 oC – 200 oC untuk digunakan pada proses pemanasan sistem uap pada usaha kecil vulkanisir ban. Pada penelitian ini akan dikaji mengenai bagaimana perancangan konstruksi boiler jenis vertical fire tube boiler yang menghasilkan uap jenuh pada temperatur 150 oC - 200 oC. Hasil perancangan kontruksi boiler jenis Vertical fire tube boiler dengan spesifikasi sebagai berikut : Jenis uap basah, Temperatur operasi; 150 oC – 200 oC, Tekanan internal; 6 bar, Tekanan operasi; 2 bar, Bahan bakar; kayu bakar, Volume air maksimal; 93,6 liter. (Dimensi boiler yaitu; diameter boiler; 504,6 mm, Tinggi boiler;1450 mm, Diameter pipa api; 42,5 mm dan Jumlah pipa api;13)
Numerical simulation of co-firing oil palm fronds and lignite coal injected at different burning rates in tangential pulverized coal burner Ihsan, Sobar; Prabowo, Prabowo; Widodo, Wawan Aries; Saputra, I Nyoman Agus Adi
International Journal of Renewable Energy Development Vol 14, No 3 (2025): May 2025
Publisher : Center of Biomass & Renewable Energy (CBIORE)

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.61435/ijred.2025.60982

Abstract

Reducing CO₂ emissions and utilizing biomass, particularly palm oil mill waste, is crucial for addressing climate change, enhancing air quality, and advancing environmentally sustainable clean technology innovations. Palm fronds can serve as a renewable fuel source with minimal emissions, providing a viable co-firing option for coal in coal-fired power plants (PLTU). Although previous studies have shown promising CO₂ emission reductions through co-combustion of oil palm fronds and coal, there is still no comprehensive analysis of the combustion characteristics and emission behavior when varying the burner injection zone, thus further research is required. This study performs a numerical analysis using three-dimensional computational-fluid dynamics (CFD) to examine the co-burning process of palm fronds alongside low-calorie coal (LRC) at the Pacitan PLTU, which has a capacity of 315 megawatts. The co-burning simulation, incorporating a 5% substitution of palm fronds in each burner, was conducted to differentiate between burners A and D, aiming to determine the optimum injection area. The findings of the simulation reveal inconsistencies in combustion properties, particularly regarding temperature allocation. The primary results demonstrate a temperature rise when palm fronds are used as a co-firing fuel, attributed to their greater volatility and oxygen content compared to coal. The most notable decrease in CO₂ emissions was observed with the substitution of 5% oil palm fronds in burner B; however, the reduction was not substantial, as indicated by a mass fraction value of 0.128 at the boiler discharge. An increase in NOx mass fraction was also observed due to the organic nitrogen in palm frond biomass, which decomposes rapidly during combustion at high temperatures. This co-firing technology is expected to provide a means for lowering emissions and improving the use of alternative fuels as a substitution for fossil fuels in a time to come.
Co-Authors ,, Irfan Ashar, Muhammad Prabowo Prabowo Ramadhan, Slamet Saputra, I Nyoman Agus Adi Wawan Aries Widodo