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Wiji Mangestiono
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PEMBUATAN PROTOTIPE PENGERING BATUBARA UNTUK MENGURANGI MOISTURE CONTENT PADA PLTU Mangestiono, Wiji
Gema Teknologi Vol 18, No 1 (2014): April 2014 - October 2014
Publisher : Vocational School Diponegoro University

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (190.667 KB) | DOI: 10.14710/gt.v18i1.8814

Abstract

Wiji Mangestiono, in paper prototype development of coal dryer to reduce moisture content on power plant explain that the percentage of coal use in the power industry in Indonesia has increased during the period of the last ten years. This policy is taken by the government by at least two considerations, namely: the higher world oil prices so that the price of electricity per kwh increase in addition Indonesia itself is the world's largest coal producer with serial number to six so that the transfer of fuel oil to the coal is considered very right. There is a fundamental problem that must be observed that coal mining in Indonesia in general have a low- rank quality with sub - categories butuminus and lignite which has a low calorific value (below 6100 kcal / kg ) and moisture content (moisture content) relatively high (40%). This is exacerbated by the way the coal deposit which is usually placed on the page (coal yard). Low-rank coal with pores relatively greater will more easily absorb water during the rainy season so that the moisture content will be even greater. The use of coal in Rembang reached 1.3 million tons / year. Heat loss due to the use of coal with a high moisture content reaches 300 billion kcal per year or equivalent to coal with a calorific value of 50 thousand tons or the equivalent of cash also 30 billion rupiah. After observing the phenomenon in Rembang the researchers plan to create a prototype coal heaters with a capacity of 100 kg / hour in the hope of getting a concept to eliminate or minimize heat loss as described. Heating devices planned screw -shaped drum with a player in it which serves stirring granulated coal. The hot air is taken from the flue gas is sprayed into the drum. The independent variable of this study is the screw rotational speed and the speed and temperature of the hot air flow. Coal is expected after discharge from the dryer may have a water content below 10 % as high quality coal (anthrasit). Keyword : coal, moisture content, dryers
PENGARUH ADITIF ION Cu TERHADAP MORFOLOGI KERAK GIPSUM PADA PIPA BERALIRAN LAMINER DENGAN PARAMETER LAJU ALIR Mangestiono, Wiji
METANA Vol 6, No 02 (2010): Desember 2010
Publisher : Universitas Diponegoro

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (350.043 KB) | DOI: 10.14710/metana.v6i2.3855

Abstract

Abstract Parameter in this experimental is flowrate which has some effect on the morfology of cristals  produced  such  as crystal system and crystal size. Study of morfology in this research were needed to justify what kind the crystals is and to know the effects of the adition some aditives. To fullfil this demand analysis of Scaning Electron Microscopy were done and also measurement the mass of crystals. The result of this experiment : the mass of crystals decrease by adition ion Cu2+ five ppm and 10 ppm, but crystal morfology has no difference in its siystem otherwise in its length. Crystal system still orthorhombic. Keywords : crystal, flowrate,morfology, aditive
MICROANALYSIS PEMBENTUKAN KRISTAL CALSIUM SULFAT PADA PIPA BERALIRAN LAMINER DENGAN PARAMETER LAJU ALIR Mangestiono, Wiji
METANA Vol 7, No 01 (2011): Juli 2011
Publisher : Universitas Diponegoro

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (223.069 KB) | DOI: 10.14710/metana.v7i01.4028

Abstract

Abstract   Gypsum (CaSO4. 2H2O) scaling inside pipe is very problematic for industries since it causes narrowing of pipe diameter, thickening of heat transfer surfaces, lenghthening the process time and finally increase the cost of production. It is therefore necessary to prevent the occurance of gypsum scaling in a piping system. This report describes an experiment on gypsum scale formation utilizing CaCl2.2H2O and Na2SO4 solutions to form gypsum ( CaSO4. 2H2O). The concentration the calcium ions selected was 3,500 ppm. The experiment was carried out a pipe with several coupons made of copper representing common pipe material used in industry. Flowrate of gypsum solution as one of process parameters for gypsum scaling was varied: 30, 40 and  50 ml/minute  respectively. In addition, Cu2+ as impurities was aded into the solution : 5 and 10 ppm respectively. In adition, a microanalysis on the scale was also caried out using EDAX. The mass of the scale formed was calculated in order to determine the rate of the gypsum scale growth. Keywords : flowrate, gypsum, impurities, piping system.
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