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All Journal IPTEK The Journal of Engineering Jurnal IPTEK
Daril Ridho Zuchrillah
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Chemical Engineering, Chemistry & Bioengineering Civil Engineering, Building, Construction & Architecture Computer Science & IT Electrical & Electronics Engineering Engineering Industrial & Manufacturing Engineering Mechanical Engineering

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PEMILIHAN TEKNOLOGI PROSES GEOTHERMAL SECARA TEKNIS PADA PEMBANGKIT LISTRIK TENAGA PANAS BUMI DI INDONESIA Daril Ridho Zuchrillah; Renanto Handogo; Juwari Juwari
Jurnal IPTEK Vol 21, No 2 (2017)
Publisher : LPPM Institut Teknologi Adhi Tama Surabaya (ITATS)

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31284/j.iptek.2017.v21i2.203

Abstract

Saat ini, geothermal power plant memproduksi beban dasar listrik yang lebih murah, handal dan ramah lingkungan. Namun efisiensi konversi yang terdapat pada pembangkit listrik tenaga panas bumi sangatlah kecil daripada pembangkit listrik tenaga fosil lainnya. PT. Geo Dipa Energi unit Dieng, Jawa Tengah merupakan salah satu perusahan pembangkit listrik di Indonesia yang memanfaatkan energi panas bumi berupa steam sebagai penggerak utama dengan teknologi flash steam. Pemilihan teknologi proses flash steam telah dikembangkan dengan model pendekatan matematis berdasarkan hukum termodinamika menggunakan software Engineering Equation Solver (EES). Pada penelitian ini dapat disimpulkan bahwa kualitas fisik steam yang dihasilkan dari sumur produksi dalam suhu 306 ⁰C dan mempunyai nilai entalpi sebesar 1379,7 kJ/kg, Kondisi operasi separator yang digunakan perangkat lunak EES berada di suhu 179,9 ⁰C dan tekanan 1000 kPa dengan menghasilkan daya listrik sebesar 13.929,63 kWe dengan besarnya efisiensi 23,41 %. Telah dikembangkan simulasi pemodelan dengan kombinasi antara single flash steam dengan binary cycle. Kombinasi teknologi single flash steam dan binary cycle ini menghasilkan daya sebesar 18.456,24 kW dengan efisiensi overall plant sebesar 31,02 %. Hal tersebut memiliki efisiensi terbesar sehingga dirujuk sebagai pilihan teknologi proses geothermal yang tepat untuk PLTP PT. Geo Dipa Energi unit Dieng, Jawa Tengah. Sedangkan teknologi kombinasi single flash dengan dual binary cycle ini menghasilkan daya sebesar 18.329,768 kW dengan efisiensi overall plant sebesar 30,81 %.
Computational Fluid Dynamics (CFD) Simulation of Mixing Tank at Milk Powder Factory to Reduce Material Losses Agus Surono; Achmad Dwitama Karisma; Muchamad Kurniawan Dwi Febrianto; Fitriah Dwi Mulyani; Daril Ridho Zuchrillah
IPTEK The Journal of Engineering Vol 9, No 1 (2023)
Publisher : Lembaga Penelitian dan Pengabdian kepada Masyarakat

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.12962/j23378557.v9i1.a16323

Abstract

Industrial milk powder production applies the principle of a spray dryer. In the powdered milk industry using a spray dryer, there are still some problems in actual conditions such as fouling in the heat exchanger and losses. Losses are lost material or time so that result in losses for the company. The importance of finding material losses as soon as possible it is possible to make a solution so that initially unknown material is wasted in vain can be used as a finished good. Steps taken to resolve the problem material losses is to identify problems and data by making mapping losses according to actual conditions. After that, a CFD mixing tank simulation can be performed on Ansys with the aim of the simulation is to get the contour of the foaming phenomenon and find out the height the phenomenon of foaming (foam) with the properties set up begins at the beginning of making geometric designs with the size of the tank is 3.5 m and uses a marine propeller type,  then proceeds with meshing In geometry, meshing here uses the automatic meshing method due to the limited analysis students. after that the solving stage is carried out by inputting data such as density, viscosity and input multiphase (mixture), viscous (Large Eddy Simulation), as the boundary conditions of the geometry, after that by making a plane from the results of running to form a plane in geometry, then choose the results of the contour volume fraction to find out the phenomena that occur in mixing  tank so that conclusions and solutions can be drawn. Based on the results of data analysis and the field in the form of mapping and data on quantity losses, there are still some material losses in the form of wet and dry losses that have not been identified, initially the percentage ratio of material losses is 40.57% to 9%. One of the biggest contributors to material wet losses is mixing tanks which simulated until it is known that there is a foaming phenomenon. It interferes with the way it works level sensor which causes less maximum withdrawal of milk liquid by the pump. The best solution right way to reduce losses that occur in the mixing tank is to close the valve mixing tank output when showing 1.8% or can be rounded to 2% for safety pump. The liquid that is used as a product is 270 liters which is equivalent to 113 kg. If the calculation is carried out, the company can store 8,505 kg/month of powder.
Techno-Economic Analysis of Fuel Switching from Coal to Natural Gas for NPK Fertilizer Drying Process Rizal Arifin; Devi Intan Silviani; Rakhma Ayu Giarti; Daril Ridho Zuchrillah
IPTEK The Journal of Engineering Vol. 12 No. 1 (2026)
Publisher : Institut Teknologi Sepuluh Nopember

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.12962/j28075064.v12i1.9573

Abstract

Using coal as the primary fuel in the NPK fertilizer industry contributes significantly to carbon dioxide (CO₂) emissions, which negatively impact the environment and hinder the achievement of national decarbonization targets. To address this, this project aims to evaluate the technical and economic feasibility of switching from coal to natural gas in the furnace unit of the NPK fertilizer production process. As demands for efficiency and sustainability increase, the evaluation of fuel switching to natural gas is underway. This project re-simulates the combustion process in the furnace using Aspen Plus V14. Evaluation is carried out on thermal performance, CO₂ emissions, and economic indicators, including Capital Expenditure, Operational Expenditure, NPV, IRR, and Payback Period. The results show that natural gas achieves a thermal efficiency of 90.11%, reduces CO₂ emissions by 27.5% compared to coal, and yields a favorable economic value: NPV of $76,009.13, IRR of 32%, and Payback Period of 3 years. Based on these results, natural gas is considered a balanced fuel option from technical, environmental, and economic perspectives. It is feasible to implement as an energy transition strategy in the NPK fertilizer industry.
Co-Authors Achmad Dwitama Karisma Aminuyati Devi Intan Silviani Fitriah Dwi Mulyani Muchamad Kurniawan Dwi Febrianto Rakhma Ayu Giarti Renanto Handogo Rizal Arifin