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Kaji Eksperimental Kekuatan Briker Hasil Reduksi Bijih Besi Dengan Batubara Muda Menggunakan Metode Hot Briquetted Iron (HBI)
Get PDFThis research aims to study the mechanics (strength) properties of iron ore briquettes. Iron ore briquettes are made using the hot briquetted iron method (HBI). HBI is a briquette after reduction directly and pressed at a temperature above 650 C and has more density than 5000 kg/m3. The specimens used were iron ore briquettes made of the composition of iron ore, coal, and adhesives. The composition of the briquettes is 55: 40: 5, 65: 30: 5, 75: 20: 5, 85:10: 5 and the reduction temperature is 750C,850C,950C and 1050C. There are 16 briquett specimens. After the briquettes are made, the briquettes are reduced using a reduction blast furnance which is fuel by LPG and CO2 gas. When the mass of briquette is no longer decrease ore the time (reach steady state condition) the briquettes take out from the blast furnance for press. Pressing is carried out in hot briquettes conditions and the press load is 15 tons. The results obtained from testing the I-Type Tumbler Test have more small paricle ruptures because the briquettes have lost their adhesive during the reduction process and coal does not affect the strength of the HBI briquettes. After being reduced briquettes are given more adhesive so that briquettes can be tested again. Iron ore briquettes after reduction are stroger than those before reduction. In the variation 85:10:5 obtained from testing I-Type Tumbler Test iron ore briquettes test after reduction has a number of particle small rupture 0,21% while iron ore briquettes before reduction of 3,35%
Kaji Sistem pengering Kakao dengan Menggunakan Energi Hybrid (Energi Matahari dan Bahan Bakar Gas)
Get PDFCocoa one of the agricultural commodity which grow well that in Aceh and could producing the fruit for the rest of the year. In 2017, the wide of productive area reached 98,233 hectares (HA). The result of the crop was capable attained 32,403 tons/year. However, due to Aceh has climate tropical, when the dry season came, the drying process was still could on processing but when rainy season came, the drying process will be hampered and if the weather was still not sunny probaly it could make the fungus appeared. The aim of the research was to get the more optimal drying system so that it could be used when it was dry or rainy. The research described about drying system with 3 drying methods that is solar collector dryer, combustion dryer and hybrid dryer. From the result which conducted on 16 kg using a solar collector, the drying time was 25 hours with total energy used was 23.491,01 Kj. On the trial used hybrid energy, the drying time was 19 hours which total energy used was 160.636,19 Kj. On the trial used combustion energy, the drying time reached 14 hour with total energy used was 184.546,58 kj. in concluions that hybrid energy could get the best result in colour, kakao aromatic that more scents, no fungus, and the the seed could not break so that it reach I SNI quality
Analisa Potensi Energi Surya untuk Energi Listrik Banda Aceh dan Sekitarnya
Get PDFElectrical energy crisis has become a common problem in Indonesia. Particularly Banda Aceh and surrounding areas, the impact of this phenomenon was a direct impact on the activities of the community. In general, Indonesia has a tropical climate that is potentially going to optimal utilization of solar energy. Particularly Banda Aceh and the surrounding in general have a geographical location in the coastal areas, which have the potential of solar energy potential. This study aims to analyze the potential value and also the effectiveness of solar energy, then analyze the electrical power generated by the solar cell in Banda Aceh and its surroundings. To determine the value of the potential of solar energy begins to measure and collect the value of the intensity of the sun. In case this is done by using the solar cell by measuring the intensity of the sun, current, voltage and temperature. This research was supported by the data collecting solar intensity value for 2 months at three different points, namely in Thermal Engineering Laboratory, BMKG Blang Bintang and SMK PPN Saree. This study degan manifold uses polycrystalline silicon solar cell with an area of 0.715 m2 solar intensity values obtained on October 27, 2016 amounted to 596 Watt / m2, and the output power of electricity by an average of 52.27 Watt. In October 28, 2016 the average light intensity of 475 Watts / m2dan electric power output by an average of 31.37 Watt. In October 31, 2016 the average light intensity of 330 Watts / m2, and the output power of electricity by an average of 30.77 Watt. In 1 November 2016 the average light intensity of 686 Watts / m2, and the output power of electricity by an average of 50.93 Watt. In 2 November 2016 the average light intensity of 675 Watts / m2, and the output power of electricity by an average of 49.84 Watt
Penggunaan Accelerometer dan Strain Gauge Sebagai Sensor Untuk Mendeteksi Kerusakan Pahat Potong
Get PDFThe damage of cutting effect the product a lot, thus reducing the quality and dimensional change of the product. This research aims to monitor damage of cutting tool throught the accelerometer and strain gauge sensors on the process of turning Rod hydraulic cylinder SAE 1045 using cutting carbide coated. The machining process is carried out by the variation of cutting parameters, depth of cut 0,5 and 1,0, feed rate o,5 and 0,7 mm/min, and constant cutting speed of 1300 rpm. This experiment is conducted on three cutting tool condition they are new, medium wearing (0,15 mm) and critical wearing (0,3 mm). The censors used are accelerometer and strain gauge which are placed in the holder. The result show that kurtosis, RMS and standard deviation parameters are influenced by the tooling condition. Have the relation toward the wearing change of tooling, this case is showed by the existence of progress from the new, medium and critical tooling test. As for amplitude strain gauge signal also showed a significant change when there is damage to the wearing tools. This showed that the bigger wearing happening the higher signal out going
Desain dan Analisis Rangka Mobil Listrik Malem Diwa X.2 Model Prototype Menggunakan Metode Elemen Hingga
Get PDFSupplies of fossil fuels as an energy source that is depleting became its own challenges in the provision of energy to the continuation of the future. One alternative is to become energy electrical energy. Study conducted in this study is meant to make the eco-friendly vehicles, one example is the electric car. Light vehicle weight and becomes a keyword in doing energy saving in everyday. The research was carried out using the element method to the frame of the car, with condition of load static general. The software used in this study is ABAQUS. From the results stress result maximum stress of 1.972 x 105 Pa, maximum strain results of 2.592 x 10-6, while the displacement that occurred was of 2.858 x 10-7 m. Research results obtained that the car frame able to withstand loads given of 700 N, so that, it can be concluded that the framework of this car is secure against a given load
Peningkatan Kinerja K3 Dan KO Di Perusahaan Pertambangan Melalui Penerapan SMKP
Get PDFPT Adaro Indonesia is a mining company that operates under the covenant of works concessions of coal mining, on the mining area of PT Adaro Indonesia or ADMO (Adaro Mining Operation) there is a mining services company PT Saptaindra Sejati (PT. SIS), that move in modern mining and contractors provide services for mining and related industries in the ADMO. The research methodology was literature study, field observation, and questioning employees. PT.SIS has been applied Mining Safety Management System application of Mineral and Coal as know as (SMKP Minerba) for all elements, but the level of the achievement on the elements are 88.29% still dropping from the previous year to reach 92.80%. this publication only for element IV, Implementation. The achievement on this element only reached 79% below previous year reach 91%. Provide recommendations as an attempt to improvement efforts to PT. SIS, as well as the company's internal evaluation in order to no longer obtained the findings of major or minor in following (SMKP) audit
Simulasi Efek Galvanik pada Baja Karbon Sedang Hasil Perlakuan Panas Menggunakan Boundary Element Method (BEM)-3D
Get PDFThis research simulates the galvanic effect on medium carbon steel from the result of heat treatment using the Boundary Element Method (BEM) -3D. BEM was developed with the assumption that the electrolyte surrounding the anode-cathode system no ions in or out, so that it can be modeled as Laplace domain. The potential value and the current density across the surface of the domain can be determined by solving the Laplace equation using the BEM. The Galvanic effects can be analyzed by using the potential data. To simulate the galvanic effect on medium carbon steel the result of heat treatment, two anode-cathode combination was set. The first combination is the annealing steel as the anode and the normalizing steel as the cathode. While the second combination is a hardening steel as the anode and the normalizing steel as the cathode. The conductivity value of the electrolyte for the galvanic effect simulation is 0.0541 / m. The simulation results of the first combination showed the most negative anode potential value is -104.09 mV and the cathode potential value of -85.41 mV. While the simulation results from the second combination provides the most negative anode potential value are -220.27 mV and the cathode potential value are -85.41 mV. From the simulation can be seen that the potential difference between the first anode-cathode combinations are +18.69 mV and the second combination are +134.86. Thus, the simulation results show that the combination of annealing steel and normalizing steel produce galvanic effect is relatively small. While the combination of hardening steel and normalizing steel provide galvanic effect is relatively large
Kaji Eksperimental Pengaruh Fase Operasi Unit Tungku Garam Semi Modern Terhadap Prestasinya
Get PDFHeating furnace which has been used by farmers to boil salt feed water is a traditional wood-fired furnance that is very simple and very inefficient. Researchers have made several modifications to the furnace unit multi-pot configuration that can utilize waste heat in order to improve the efficiency of the furnace. Potential waste heat of exhaust gas can be used as preheater. The methodology used to asses the performance on the furnace in water boiling test method operating condition of the cold start, hot start, and simmer. The data obtained then analyzed, the result showed that the burning rate and fire power that occurred during the cooking procces of the operation conditions of the cold start, hot start, and simmer increase, but the thermal efficiency decrease. This indicates that increasing of combustion efficiency has not been able to be utilized to the maximum heat. Value of the thermal efficiency of the furnace is affected by the value of useful energy to heat the water in the pot and the amount of energy entry/energy of combustion
Kajian Eksperimental Pengurangan Gas Emisi Co2 dengan Teknologi Biosphere
Get PDFAccording of air pollution technology can be reduced by two methods: by using the Oceans method or Biosphere method. Oceans method known a way that is burying CO2 in the deep of sea water of oceans. Biosphere method is known as the method of using natural and plant, namely by multiplying the trees in the neighborhood that will create air quality in the surrounding environment is increased. With this method made design research tool that room 1 and room 2 with dimensions of 50 cm x 50 cm x 100 cm with isolated condition. In the first room filled with gas emission vehicle for 60 minutes and then measured by a gas analyzer in order to determine the composition of vehicle exhaust emissions. Gas emissions of vehicles streamed into the room space 1and 2 by using a blower through 3 pieces of flexible hoses. In room 2 vehicle emissions react with activated carbon and tree to absorbs CO2 from vehicle emissions, then for 60 minutes once for 5 hours of data taken and observed. Research results show, with the absorption of CO2 emission and method biosphere technology is very significant influence as evidenced from the graph of CO2 emission and absorption of O2 release to the environment. Variations trees greatly affect the ability of absorption of CO2 gas emissions and O2 release to the environment, also the effect of adding activated carbon additive affects the absorption process of the addition of CO2 emissions and the release of O2 into the environment with a total absorption of 60% CO2 and release O2 at 5.8%. Trees are able to absorb the most CO2 emissions in the period of the most rapid and release O2 is trambesi tree with a total absorption of 80% CO2 and the release of O2 by 7.2% with a time of 300 minutes with the absorption of 3.33 ppm. m2 / min
Perancangan Sistem Pembangkit Listrik Hibrida untuk Menggerakkan Pompa Air di Area Pertanian
Get PDFThe economic development and population growth in Indonesia has been increasing rapidly. Most of the agricultural land converted into residential and industrial areas, while many farmers moved to a mountainous area. Farmers in mountainous agricultural area using existing sources of water in a small mountainous rivers to irrigate agricultural land, they use man power to lift water from a small river to agricultural land, it is highly ineffective in agricultural products. Farmers with adequate financial can use pumps for raising the water to agricultural land. But because it is far from the power source, pump can only work with the use of expensive fossil fuels. Therefore, to overcome this problem it is necessary to use a renewable energy source which is available in the area such as solar energy and wind or both of them. This research examines about the hybrid power plant (PLTH) of solar and wind energy to power the agriculture pump. The wind speed and solar radiation data is obtained from measurements by BMKG-SMPK-Plus Sare. The output power of the Photovoltaic is equal to 193 W with the exposure time of 5 hours/day, while the power output of the wind turbine is 459.84 W with a 3m blade diameter long and 7 hours/day blowing wind. The pump power was 558 W with a capacity of 20,160 liters/hour, it is used for 15 ha of agricultural area. Based on the analysis results, the proposed system will generate an initial investment cost of US$ 14.938 with power production equal to 3.210 kW/year