Hasil Pencarian  ::  Simpan CSV :: Kembali

Abstrak :
ABSTRAK
A compact, simple and low-cost transversely excited atmospheric (TEA) pressure ultraviolet nitrogen laser {337 nm) has been designed and constructed employing the conventional Blumlein circuit. The measured energy of the output pulse of 337 nm is around 80 -J at 25 kV of charging voltage and l atm operating gas pressure. The beam divergence is found to be 7.7 mrad horizontally and 1.5 mrad vertically. The energy output decreases slightly with increasing gas pressure and gas flow rate, while the beam divergence is relatively stable with respect to the same operating parameters.

Abstrak :
Dalam studi ini, efektivitas penyerapan CO2 menggunakan kontaktor membran serat berongga dievaluasi berdasarkan variasi laju alir gas, variasi laju alir pelarut, dan alokasi cairan. Pada studi ini digunakan kontaktor membrane yang terdiri dari 50 serat PVC dan pelarut Triethanolamine. Laju alir gas yang digunakan adalah 0.1, 0.15 dan 0.2 L/min, sedangkan laju pelarut yang digunakan adalah 200, 250, 300, 350, dan 400 mL/min. Kemampuan penyerapan paling baik adalah ketika laju alir pelarut sebesar 400 mL/min, laju alir gas sebesar 0.2 L/min dan mengalirkan pelarut di dalam fiber. ......In this study, the effectiveness of CO2 absorption through hollow fiber membrane contactor is evaluated based on the gas flow rate variation, solvent flow rate variation, and fluid allocations. The present stud involves a membrane contactor with 50 PVC fibers and Triethanolamine as solvent. Gas flow rate used was 0.1, 0.15 L and 0.2 L / min, while the rate of solvent used is 200, 250, 300, 350, and 400 mL / min. The absorption is at its best when the solvent flow rate is 400 mL/min, when gas flow rate is 0.2 L/min and by flowing the solvent inside the fiber.

Abstrak :
Emissions of NOx, SO2, and CO gas, which mainly result from human activities, pose significant health and environmental risks. While various technologies have been developed to tackle these emissions individually, there's a growing need for a solution that can address all of them at once. Membrane contactor technology offers a promising approach due to its efficiency and greener footprint compared to conventional methods. In this study, the simultaneous removal of NOx, SO2, and CO emissions from diesel engine exhaust gas using a polysulfone hollow fiber membrane contactor combined with a nanobubble treated sodium chlorate (NaClO3) and sodium hydroxide (NaOH) as absorbents is discussed. The exhaust gas flows continuously into the tube side, while the shell side contains the absorbents. The independent variables of this research are diesel engine gas feed flow rate and NaClO3, NaOH concentration. The most effective flow rate for removing the exhaust gas is 100 mL/minute, and the concentrations of NaClO3 and NaOH each are 1M and 0.01M. ......Aktivitas manusia menghasilkan gas NOx, SO2, dan CO dalam jumlah besar. Emisi gas-gas tersebut memberikan resiko yang signifikan pada kesehatan dan lingkungan. Hingga kini berbagai teknologi telah di kembangkan untuk menangani masalah emisi gas-gas tersebut secara terpisah, sejalannya waktu kebutuhan untuk solusi yang dapat menangani semua masalah secara bersamaan terus meningkat. Teknologi Membran Kontaktor merupakan pendekatan yang menjanjikan dikarenakan efisiensitas dan lebih ramah lingkungan dibandingkan dengan metode konvensional. Dalam studi ini, kami ingin mengkaji emisi NOx, SO2, dan CO dapat dihilangkan secara bersamaan dari gas buangan mesin diesel menggunakan "Polysulfone Hollow Fiber Membrane Contactor" dengan "Nanobubble treated Sodium Chlorate" (NaClO3) dan "Sodium Hydroxide" (NaOH) sebagai media serapan. Gas buang mengalir secara terus-menerus ke dalam tube, sementara pada sisi shell terdapat media serap. Variabel independen pada riset ini adalah jumlah laju aliran dari gas buang mesin diesel dan kejenuhan NaClO3. Efek dari variabel independen ini akan dikaji ulang dengan variabel lain diantaranya efisiensi serapan (%R), mass transfer flux (J), dan nilai loading dari gas NOx, SO2, dan CO. Laju alir gas buang terefektif untuk CO adalah 100 mL/menit dan konsentrasi NaClO3 and NaOH masing-masing adalah 1M dan 0.01M.

Abstrak :
[Gas alam sudah menjadi alternatif bahan bakar maupun digunakan sebagai bahan baku industri. Gas alam terdiri dari senyawa hidrokarbon berupa gas, seperti metana, etana, propana, butana, dan kondensat. Namun gas alam memiliki kandungan pengotor berupa air, nitrogen, karbon dioksida, hidrogen sulfida, dan merkuri yang harus dihilangkan. Teknologi kontaktor membran merupakan salah satu cara dalam menghilangkan kandungan karbon dioksida yang terdapat di dalam gas alam. Pada penelitian ini digunakan teknologi kontaktor membran serat berongga superhidrofobik dengan menggunakan pelarut DEA. Penelitian ini bertujuan untuk mengetahui persen penyerapan gas karbon dioksida dari pelarut DEA serta untuk mengetahui pengaruh laju alir gas umpan terhadap fenomena perpindahan massa yang terjadi di membran. Dari fenomena perpindahan massa yang terjadi, akan didapatkan kinerja dari kontaktor membran serat berongga superhidrofobik dalam proses absorbsi gas karbon dioksida. Berdasarkan penelitian yang dilakukan, jumlah gas karbon dioksida yang terserap sebesar 0,03128-0,05331 mmol/s untuk modul dengan jumlah serat 8000 dan untuk modul dengan jumlah serat 2000 mampu menyerap gas CO2 sebesar 0,0268-0,02994 mmol/s. Nilai koefisien perpindahan massa yang didapatkan untuk modul dengan jumlah serat 2000 adalah sebesar 1,93x10-4-2,5x10-4 cm/s dan modul dengan jumlah serat 8000 sebesar 9,8x10-5 – 1,44x10-4 cm/s untuk variasi laju alir gas sebesar 170, 255, dan 340 cm3/min dengan laju alir pelarut DEA yang tetap sebesar 500 cm3/min. ......Natural gas has been used as alternative fuel or used as industrial raw materials. Natural gas consists of hydrocarbon compounds such as methane, ethane, propane, butane, dan condensats. However, natural gas also consists of impurities such as water, nitrogen, carbon dioxide, hydrogen sulfide, and mercury which have to remove. Membrane contactor technology is one of the methods which is used to remove carbon dioxide contents that contained in natural gas. In this study, we use hollow fiber membrane contactor using DEA as the solvent. The aim of this study is to know the absorption percentage of carbon dioxide and to know the effect of feed gas flow to mass transfer phenomenon which is occurred in membrane contactor. From the mass transfer phenomenon, we will obtain the performance of superhydrophobic hollow fiber membrane contactor in the absorption process. According to this study, the amount of carbon dioxide absorbed are about 0,03128-0,05331 mmol/s for the module with 8000 fibers and for the module with 2000 fibers able to absorb CO2 about 0,0268-0,02994 mmol/s. The value of mass transfer coefficient which yang is obtained from the module with 2000 fibers are 1,93x10-4-2,5x10-4 cm/s and for the module with 8000 fibers are 9,8x10-5-1,44x10-4 cm/s for the variation of the feed gas flow: 170, 255, dan 340 cm3/min with the DEA constant flowrate about 500 cm3/min., Natural gas has been used as alternative fuel or used as industrial raw materials. Natural gas consists of hydrocarbon compounds such as methane, ethane, propane, butane, dan condensats. However, natural gas also consists of impurities such as water, nitrogen, carbon dioxide, hydrogen sulfide, and mercury which have to remove. Membrane contactor technology is one of the methods which is used to remove carbon dioxide contents that contained in natural gas. In this study, we use hollow fiber membrane contactor using DEA as the solvent. The aim of this study is to know the absorption percentage of carbon dioxide and to know the effect of feed gas flow to mass transfer phenomenon which is occurred in membrane contactor. From the mass transfer phenomenon, we will obtain the performance of superhydrophobic hollow fiber membrane contactor in the absorption process. According to this study, the amount of carbon dioxide absorbed are about 0,03128 – 0,05331 mmol/s for the module with 8000 fibers and for the module with 2000 fibers able to absorb CO2 about 0,0268 – 0,02994 mmol/s. The value of mass transfer coefficient which yang is obtained from the module with 2000 fibers are 1,93x10-4 – 2,5x10-4 cm/s and for the module with 8000 fibers are 9,8x10-5 – 1,44x10-4 cm/s for the variation of the feed gas flow: 170, 255, dan 340 cm3/min with the DEA constant flowrate about 500 cm3/min.]