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Bahar, Hendra
Institut Teknologi Adhi Tama Surabaya
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STUDI GERAKAN TANAH DI DESA NGETOS, KECAMATAN NGETOS, KABUPATEN NGANJUK Bahar, Hendra; Artawijaya, Yanira
Jurnal Geosaintek Vol. 10 No. 1 (2024)
Publisher : Institut Teknologi Sepuluh Nopember

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Abstract

Landslides, for example in the incident in Selopuro Hamlet, Ngetos Village, Ngetos District, Nganjuk Regency, East Java Province, on Sunday, 14 February 2021, at 18.00 WIB, a landslide from the upper slopes hit the settlements below, Therefore, this study aims to determine the dominant factors that influence the occurrence of landslides in the Ngetos Village, as well as in which areas have the same potential for landslides as in Ngetos Village. The research was carried out by analyzing using the overlapping technique (overlay) of Geographic Information Systems (GIS). Based on the zoning of the susceptibility of ground movement, there are 3 (three) locations in the study location that are vulnerable to ground movement, namely Ngetos Village and Suru Village in Ngetos District, and Macanan Village in Loceret District, Ngajuk Regency. The causes of landslides besides the factors of slope, rainfall, and vegetation, are also caused by the type of lithology (rock/soil) in the form of weathered andesite igneous rock which is quite thick, as well as the presence of cracks on the top of the hill at the study site.
Analisis Kualitas dan Estimasi Sumber Daya Batu Gamping Daerah Lohjejer – Jember Yuwanto, Sapto Heru; Fanani, Yazid; Bahar, Hendra; Irmawati, Erni
Semnas Ristek (Seminar Nasional Riset dan Inovasi Teknologi) Vol 10, No 1 (2026): SEMNAS RISTEK 2026
Publisher : Universitas Indraprasta PGRI

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30998/semnasristek.v10i1.8873

Abstract

Evaluation of Slagging and Fouling Indices in Boilers, for Steam Power Plant Prima Aryandi; Jusfarida Jusfarida; Hendra Bahar; Avelyn Shintya Sari; Fairus Atika Redianto Putri; Korchnoi Pasaribu
Jurnal Teknologi dan Manajemen Vol 7, No 2 (2026): July
Publisher : Lembaga Penelitian dan Pengabdian kepada Masyarakat ITATS

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31284/j.jtm.2026.v7i2.9214

Abstract

Coal acts as the primary fuel for the boiler at PLTU to support the combustion process. The boiler serves as the main steam generator in this coal-fired power plant. During combustion, coal produces ash that deposits and leads to slagging and fouling, two conditions that reduce boiler efficiency and performance. This study analyses how slagging and fouling affect the performance of Boiler at PLTU. Using a quantitative approach, the research evaluates coal quality data (proximate and ultimate analyses), ash compound content, sulphur levels, and calculates slagging and fouling indices in relation to boiler performance. The results show that the slagging index ranges from 0.15 to 0.77 and the fouling index from 0.19 to 0.48, indicating a low to moderate tendency. When these indices are at their lowest, boiler efficiency reaches 88.05% (direct method) and 86.09% (indirect method). At their highest, efficiency drops to 78.25% and 78.65%, respectively. This decline increases coal consumption for electricity generation. These findings highlight the need for regular inspection of ash content and coal quality to reduce the negative effects of slagging and fouling on overall boiler performance.
Penentuan Kualitas Batubara dan Kalori Batubara Berdasarkan Analisis Proksimat Di Stockpile Osowilangun Surabaya, Jawa Timur Sapto Heru Yuwanto; Ericsa Brillianti; Hendra Bahar
Prosiding SENASTITAN: Seminar Nasional Teknologi Industri Berkelanjutan Prosiding SENASTITAN Vol. 05 2025
Publisher : Institut Teknologi Adhi Tama Surabaya

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Abstract

Pertambangan merupakan kegiatan yang dilakukan untuk mendapatkan suatu sumber daya alam yang berada di dalam bumi dan berupa hasil tambang. Salah satu komoditas yang menjadi primadona di Indonesia, yaitu batubara. Batubara merupakan endapan batuan sedimen yang terjadi selama beratus-ratus tahun yang lalu dan memiliki komponen unsur belerang serta nitrogen. Perlunya pengklasifikasian batubara untuk dapat dijadikan acuan dalam penentuan jenis dan kandungan kalori suatu batubara. Diperlukan uji analisis proksimat agar dapat menentukan jenis atau peringkat batubara yang dimiliki serta penentuan nilai kalori batubara. Metode studi kasus yang digunakan adalah metode kuantitatif dengan data primer dan sekunder sebagai bahan acuan dalam melakukan perhitungan. Data primer sendiri meliputi dokumentasi dan uji analisa proksimat batubara meliputi perhitungan inherent moisture, air dried moisture, total moisture, ash content, volatile matter, dan fixed carbon. Sedangkan, data sekunder meliputi data nilai kalori dan jenis batubara pada stockpile. Data tersebut diolah agar mendapatkan hasil perhitungan fixed carbon sehingga dapat menentukan dan mengukur kesesuaian kalori serta jenis batubara yang berada di Stockpile Osowilangun. Berdasarkan hasil perhitngan didapatkan nilai fixed carbon tertinggi sebesar 58,16% yang merupakan jenis batubara Bituminous High Volatile A dan nilai terendah sebesar 42,39% yang merupakan jenis batubara Lignit atau Brown Coal. Dengan nilai kalori tertinggi sebesar 7.600 kkal/kg dan terendah dengan nilai kalori sebesar 5.250 kkal/kg. Setelah dianalisis berdasarkan data perusahaan hanya terdapat 2 (dua) jenis batubara yang dapat diklasifikasikan nilai kalorinya menurut ASTM, yaitu Bituminous High Volatile A dan Sub-Bituminous A.
Co-Authors Abdibar, Aleik Ainu Abdilbar, Aleik Ainu Achmad Muzaki Achmad Purnomo Aji Aleik Ainu Abdibar Aleik Ainu Abdilbar Alvin Senjaya Andi Ilham Fadli Aquilis Bernardo Goncalves Arbol, Korneles Maranata Arif rachman Arif Rachman Artawijaya, Yanira Avelyn Shintya Sari Berek, Novrinus Leonardo Cristofer Parorak Ericsa Brillianti Fadli, Andi Ilham Fairus Atika Redianto Putri Fanani, Yazid Firdaus, Ar Royyan Genakalong, Samuel Aronaldin Goncalves, Aquilis Bernardo Handoko Teguh Wibowo Haris Saktiawan Heni Siska Wiyanti Heni Siska Wiyanti Herdiansyah Shorenata Widodo Hidayatun Nikmah Ikwan Ikwan Ikwan, Ikwan Irmawati, Erni Jusfarida Jusfarida Jusfarida, Jusfarida Korchnoi Pasaribu Korneles Maranata Arbol Kusdarini, Esthi Lakon Utamakno Lakon Utamakno Lakon Utamakno Mandalay, Suci Ainun Maulana Syah Muhammad Fanni Syahrozani Muhammad Taufik Muzaki, Achmad Parorak, Cristofer Prima Aryandi Purab, Baltasar Belang Baga Rahmadani, Veronika Budi Renaldy, Davin Rima Rosaliana Rosaliana, Rima Saktiawan, Haris Samuel Aronaldin Genakalong Sapto Heru Yuwanto Stephany Fransin Matmey Suci Ainun Mandalay Syah, Maulana Syahrozani, Muhammad Fanni Utamakno, Lakon Utamakno, Lakon Veronika Budi Rahmadani Wibowo, Handoko Teguh Wiyanti, Heni Siska Wiyanti, Heni Siska Yanira Artawijaya Yopianus, Benyamin Yudho Dwi Galih Cahyono