scholarly journals Studi Kemampuan Spray Tower untuk Penyisihan Polutan Gas dari Pembakaran Bahan Bakar Industri

2019 ◽  
Vol 2 (1) ◽  
pp. 16-19
Author(s):  
Martheana Kencanawati
Keyword(s):  
Spray Tower ◽  
Mist Eliminator ◽  
Wet Scrubber

Sebagian sumber pencemaran sulfur dioksida adalah dari aktivitas manusia seperti gas buangan pabrik maupun kendaraan bermotor. Oleh karena itu, pencegahannya dapat dilakukan oleh manusia sendiri dengan berbagai usaha. Paper ini membahas mengenai upaya pencegahan polusi dari sulfur dioksida dengan menggunakan wet scrubber. Wet scrubber didesain dengan menggunakan mist eliminator tanpa media dan menggunakan air. Variabel dalam penelitian ini adalah debit air, ketinggian sprayer dan susun vertikal sprayer. Gas  dianalisis dengan menggunakan metode konduktivitimetri manual. Pengukuran dengan metode ini dapat diaplikasikan pada  yang memiliki range ≥0.05 ppm. Hasil yang diperoleh dari penelitian adalah persentase penyisihan untuk satu tingkat sprayer dengan debit terbesar 0,14 Liter/s adalah 74.15%. Satu tingkat sprayer menggunakan ketinggian kolom pada sprayer berjarak 110 cm. Sedangkan untuk dua tingkat prayer dengan ketinggian kolom 110 cm dan 41 cm menghasilkan penyisihan  sebesar 97.74%.

scholarly journals Studi Kemampuan Spray Tower untuk Penyisihan Polutan Gas Sulfur Dioksida dari Pembakaran Bahan Bakar Industri

2019 ◽  
Vol 2 (1) ◽  
pp. 16-19
Author(s):  
Martheana Kencanawati
Keyword(s):  
Spray Tower ◽  
Mist Eliminator ◽  
Wet Scrubber

Sebagian sumber pencemaran sulfur dioksida adalah dari aktivitas manusia seperti gas buangan pabrik maupun kendaraan bermotor. Oleh karena itu, pencegahannya dapat dilakukan oleh manusia sendiri dengan berbagai usaha. Paper ini membahas mengenai upaya pencegahan polusi dari sulfur dioksida dengan menggunakan wet scrubber. Wet scrubber didesain dengan menggunakan mist eliminator tanpa media dan menggunakan air. Variabel dalam penelitian ini adalah debit air, ketinggian sprayer dan susun vertikal sprayer. Gas  dianalisis dengan menggunakan metode konduktivitimetri manual. Pengukuran dengan metode ini dapat diaplikasikan pada  yang memiliki range ≥0.05 ppm. Hasil yang diperoleh dari penelitian adalah persentase penyisihan untuk satu tingkat sprayer dengan debit terbesar 0,14 Liter/s adalah 74.15%. Satu tingkat sprayer menggunakan ketinggian kolom pada sprayer berjarak 110 cm. Sedangkan untuk dua tingkat prayer dengan ketinggian kolom 110 cm dan 41 cm menghasilkan penyisihan  sebesar 97.74%Kata kunci: sulfur dioksida, spray tower, absorbsi, conductivitymetri

scholarly journals Effect of Gas-Liquid Contact Intensification on Heat and Mass Transfer in Deflector and Rod Bank Desulfurization Spray Tower

Processes ◽  
2021 ◽  
Vol 9 (8) ◽  
pp. 1269
Author(s):  
Yuzhen Jin ◽  
Weida Zhao ◽  
Zeqing Li
Keyword(s):  
Mass Transfer ◽  
Pressure Drop ◽  
Heat And Mass Transfer ◽  
Temperature Difference ◽  
Flue Gas ◽  
Flue Gas Desulfurization ◽  
Spray Tower ◽  
Porous Media Model ◽  
Desulfurization Efficiency ◽  
Optimization Mechanism

The deflector and the rod bank are commonly used to optimize flue gas distribution in the original spray tower (OST) of a wet flue gas desulfurization system (WFGD). In this paper, the internal optimization mechanism of the deflector desulfurization spray tower (DST) and the rod bank desulfurization spray tower (RBST) are studied. Based on the Euler–Lagrange method, the standard k-ε turbulence model, an SO2 absorption model and a porous media model, the numerical simulation of the desulfurization spray tower is carried out with the verification of the model rationality. The results show that there are gas-liquid contact intensification effects in DST and RBST. Compared with OST, gas-liquid contact intensification enhances the heat and mass transfer effects of DST and RBST. The temperature difference between inlet and outlet of flue gas increased by 3.3 K and the desulfurization efficiency of DST increased by 1.8%; the pressure drop decreased by 37 Pa. In RBST, the temperature difference between the flue gas inlet and outlet increased by 5.3 K and the desulfurization efficiency increased by 3.6%; the pressure drop increased by 33 Pa.

scholarly journals Mortality of Bemisia tabaci biotype B (sternorrhyncha: aleyrodidae) adults by aliphatic and aromatic synthetic sucrose esters

2008 ◽  
Vol 51 (6) ◽  
pp. 1115-1119 ◽  
Author(s):  
Mariangela Alves ◽  
Maurício Boscolo ◽  
Odair Aparecido Fernandes ◽  
Maria Andréia Nunes
Keyword(s):  
Bemisia Tabaci ◽  
Chemical Control ◽  
Control Method ◽  
Sucrose Esters ◽  
Sodium Dodecylsulphate ◽  
Insecticidal Effect ◽  
Spray Tower ◽  
Sucrose Polyesters ◽  
Biotype B ◽  
Bemisia Tabaci Biotype B

The B-strain of Bemisia tabaci Gennadius is a key pest of several crops and chemical control is the main control method used by growers, although reduction in efficacy due to insecticide resistance has already been reported. The aim of this work was to investigate the insecticidal effect of an array of synthetic sucrose esters with the aliphatic and aromatic groups on whitefly adults. Sucrose butyrate, caprate, octanoate, palmitate, oleate, octaacetate, phthalate, benzoate, and sucrose diacetate hexaisobutyrate were tested. The solutions were prepared and applied on the adults caught on yellow sticky traps using the Potter spray tower. Long-chains sucrose aliphatic esters were more effective against the silverleaf whiteflies and the highest mortality was obtained with sucrose oleate and sucrose octanoate. Since these compounds were tensoactive, sodium dodecylsulphate was also tested for the comparison but no effect was observed. Sucrose butyrate and other aliphatic and aromatic sucrose polyesters showed negligible effect on the silverleaf whiteflies.

scholarly journals Ethanol extract of Cymbopogon winterianus on mortality and number of eggs of Tetranychus urticae

2015 ◽  
Vol 45 (7) ◽  
pp. 1154-1159 ◽  
Author(s):  
Victor Bernardo Vicentini ◽  
Dirceu Pratissoli ◽  
Vagner Tebaldi de Queiroz ◽  
Adilson Vidal Costa ◽  
Patrícia Fontes Pinheiro ◽  
...  
Keyword(s):  
Tetranychus Urticae ◽  
Ethanol Extract ◽  
Evaluation Period ◽  
Spray Tower ◽  
Lc50 Value ◽  
Cymbopogon Winterianus ◽  
Natural Insecticides ◽  
Tetranychus Urticae Koch ◽  
Promising Source ◽  
Citronella Grass

Plant extracts have been studied as a promising source of natural insecticides. This study assessed the effect of the ethanol extract of Cymbopogon winterianus Jowitt (citronella grass) in comparison with an insecticide containing azadirachtin (ICA) on mortality and number of eggs of Tetranychus urticae Koch (Acari: Tetranychidae) in laboratory conditions. For the tests, the mites were sprayed with the aid of a Potter spray tower. To assess the mortality of females, LC50 value for extract of citronella grass and ICA was, respectively, 2.63 and 2.83%. With respect to the number of eggs, the greatest reduction was observed at a concentration of 5% for the evaluation period of 120h, both for the extract of citronella grass (86%) and for ICA (81%). These results suggest the potential of the ethanol extract of citronella grass to control of T. urticae. However, experiments, under field conditions, involving other populations of T. urticae should be performed to verify the efficacy of this extract as an alternative to be used in pest management programs

scholarly journals Overall Mass Transfer Coefficient of CO2 Absorption in a Diameter-varying Spray Tower

2017 ◽  
Vol 114 ◽  
pp. 1665-1670 ◽  
Author(s):  
Xiaomei Wu ◽  
Min He ◽  
Yunsong Yu ◽  
Zhen Qin ◽  
Zaoxiao Zhang
Keyword(s):  
Mass Transfer ◽  
Transfer Coefficient ◽  
Mass Transfer Coefficient ◽  
Co2 Absorption ◽  
Spray Tower ◽  
Overall Mass Transfer Coefficient
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