STUDIEKSPERIMENTAL PENGARUH KETEBALAN (DEPTH) DARI TIP NOZZLE DAN TEKANAN UDARA PADA TIPE AIR-ASSISTED NOZZLEUNTUK SISTEM ATOMISASI CAMPURAN BATUBARA SERBUK-AIR (COAL-WATER MIXTURE (CWM))

PERMANA, DIAN (2011) STUDIEKSPERIMENTAL PENGARUH KETEBALAN (DEPTH) DARI TIP NOZZLE DAN TEKANAN UDARA PADA TIPE AIR-ASSISTED NOZZLEUNTUK SISTEM ATOMISASI CAMPURAN BATUBARA SERBUK-AIR (COAL-WATER MIXTURE (CWM)). Other thesis, Universitas Sebelas Maret.

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    Abstract

    The aim of the experimental study of atomization system for coal-water mixture (CWM)is to research, analyze and discussed the effects from the depths of the tip nozzle and air pressures toward atomization results of CWM that used air-assisted nozzle for cold testing. The Materials used in this study is a mixture of coal powder size 112.5 µm(mesh 150)and fresh water added with some additives. The composition ofthe mixture in% mass consists of, coal powder 40% and 60% fresh water with the addition of additives CMC (Carboxyl MethylCellulose)at 3% of the weight of coal. Atomiser (nozzle)were used that type of water-assisted with 3 variations in thickness (depth)of the nozzle tip, which is 1.5 mm, 3mm and 4.5 mm. Tests conducted on the atomization CWM with CWM constant pressure 2.8 bar and with variations in air pressure 2 bar, 2.4 bar and 2.8 bar. The results showed that determining the optimum composition of CWM has a strong influence in the atomization CWM. Fromthis research it is known that the air pressure of 2 bar and constantpressure ofCWM, the use ofnozzles with a thickness of 1.5 mm nozzle tip produces air flow of 0.000611 m3 / s and debit CWM registration 0.0000248 m3 / s while the thickness of the nozzle tip 4.5 mm produces air flow of 0.000617 m3 / s and debit CWM registration 0.0000323 m3 / s. And an increase in air pressure ateach nozzle tip thicknessvariation produces air flow value and debit CWM increasing, so the ratio of air / CWM also increased, thereby increasing aerodynamic forces that worked great. By variation ofthe greatest air pressure (2.8 bar)and the thickness of the greatest tipnozzles (4.5 mm)is the largest value of its ALR-0051 is 30 620 with a spray angle. With the increasing value of ALR, the atomization is formed more and more, this means fine droplets thatform are also more and more, in other words the smaller the SMD so that the quality of atomization increases. At CWM flowing air and at the end of the nozzle (nozzle tip)is less guided, mixing between air and CWM become weak. This causes the ligament that forms less able to spread. But when air and guided CWM more, mixing becomes stronger, so that the ligaments which can produce more scattered and atomization of CWM for the better. And from this research may also note that the air pressure to improve the quality of atomization. Keywords: Coal-Water Mixture (CWM), droplets, atomization, coal powder, air assisted nozzle, Carboxyl Methyl Cellulose (CMC)

    Item Type: Thesis (Other)
    Subjects: T Technology > TJ Mechanical engineering and machinery
    Divisions: Fakultas Teknik > Teknik Mesin
    Depositing User: Lia Primadani
    Date Deposited: 21 Aug 2013 20:47
    Last Modified: 21 Aug 2013 20:47
    URI: https://eprints.uns.ac.id/id/eprint/10270

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