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All Journal Buletin Ilmiah Sarjana Teknik Elektro Journal of Mechanical Design and Testing (JMDT)
Heru Hermawan
Universitas Muhammadiyah Purworejo
Electrical & Electronics Engineering Engineering Industrial & Manufacturing Engineering Mechanical Engineering

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Optimization of Water Falling Points in Micro Hydro Power Plants Hermawan, Heru; Sunardi, Sunardi
Buletin Ilmiah Sarjana Teknik Elektro Vol 3, No 1 (2021): April
Publisher : Universitas Ahmad Dahlan

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.12928/biste.v3i1.1477

Abstract

Micro Hydro Power Plant (PLTMH) is an alternative source of electrical energy for the community. PLTMH provides many benefits, especially for rural communities throughout Indonesia. When other energy sources start to run low and have a negative impact, water becomes a very important source of energy because it can be used as an energy source. PLTMH is a small-scale power plant that uses hydropower as its driving force such as irrigation channels, rivers, or natural waterfalls by utilizing the waterfall height (head) and the amount of water discharge. In rivers, there is the potential for sufficient water availability throughout the year, reliable discharge, suitable contours, and has been used for MHP. However, this river has decreased the electrical power it produces. Therefore, in this PLTMH river, it is necessary to analyze and recalculate the electric power generated by optimizing the water drop point, using an 8-inch pipe to produce a tangential force of 814.28 N, then using a 3-inch pipe to produce a tangential force of 100, 62 N and using a 2-inch pipe produces a tangential force of 25.37 N.
Implementation of Advanced Coal-Biomass Blending and Fuel Stock Management at Pelabuhan Ratu Power Plant Nurahman, Herowiko Thama; Hermawan, Heru
Journal of Mechanical Design and Testing Vol 6, No 1 (2024): Articles
Publisher : Department of Mechanical and Industrial Engineering

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22146/jmdt.97746

Abstract

The issue of climate change is of particular concern to countries around the world, including Indonesia. Many efforts are being and will be made to contribute to addressing climate change issues. Pelabuhan Ratu Power Plant (3 x 350 MW) belongs to PT PLN Indonesia Power. In line with the PLN Transformation (GREEN aspect) and the PT PLN Indonesia Power program ("Green Boosters"), Pelabuhan Ratu Power Plant contributes to produce low-carbon sustainable energy by cofiring biomass (sawdust). There are two main challenges in implementing cofiring. The first is the poor biomass handling and blending methods that are typically used in power plants. The second is the low calorific value of coal and biomass blending due to the improper blending process. To overcome these challenges, Pelabuhan Ratu Power Plant has developed an advanced coal-biomass blending and fuel stock management digitalization. By applying advanced method of coal-biomass blend, the biomass utilization (total, monthly average, and daily average) increased significantly in 2022 and 2023. Total biomass utilization increased up to 171% and still possible to be higher. The green energy production increased up to 255% and GHG emission reduced up to 255%. The fuel stock management provides optimal blending recommendations as operators' guidelines. As a result, potential derating loss due to low calorific value of blended products can be reduced by 59.9%.
Utilization of AHP-TOPSIS Combination to Determine The Best Biomass Dryer Technology at Pelabuhan Ratu CFPP Hermawan, Heru
Journal of Mechanical Design and Testing Vol 7, No 2 (2025): Article in Press
Publisher : Department of Mechanical and Industrial Engineering

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22146/jmdt.114911

Abstract

The main challenge of biomass cofiring at Pelabuhan Ratu Power Plant is the high moisture and low calorific value of the biomass (sawdust). This biomass characteristic causes low green energy production despite high biomass utilization. Meanwhile, the green energy production target continues to increase in the upcoming year, according to PLN's Cofiring Roadmap. This research focuses on the selection of biomass dryers using Multi-Criteria Decision Making, including rotary dryers, packed moving bed dryers, and flash dryers. The method used was the Analytical Hierarchy Process (AHP) and Technique for Order of Preference by Similarity to Ideal Solution (TOPSIS) using four criteria and eight sub- criteria. Seven experts were asked to complete the criteria ranking questionnaire for AHP input. Other relevant data were also collected, such as operational data, risk management, internal discussions, literature studies, and others. The top 3 criteria with the highest global weight (AHP results) are Biomass Characteristics (28.1%), Safety (20.5%), and Environment (17.8%). TOPSIS calculation resulted in the rotary dryer being the best alternative biomass dryer. Furthermore, a sensitivity test was conducted by changing the weight of each of the top 3 criteria by -25% and +25%. The results show that the rotary dryer is consistently the best alternative.
Co-Authors Nurahman, Herowiko Thama Sunardi, Sunardi