The effect of external suction at the dust outlet of a cyclone

Cyclone is one of the most commonly used particulate dust collectors in industries. It employs centrifugal force generated by a spinning gas stream to separate the particulate matter from the carrier gas. However, cyclone is efficient to collect coarse rather than fine particulate size fraction. In this regard, a study was carried out to determine the effect of creating more negative pressure at the storage hopper of a 100 mm diameter laboratory scale cyclone. The negative pressure was created by drawing out a small portion of the gas stream by means of an air pump attached to the storage hopper. Results showed that there was exponentially related between the pressure drop (ΔP) and the amount of gas stream drawn at the storage hopper, but with an increment of 2.6% with suction compared to without. Interestingly, it was observed that more of the fine particulate matter was drawn from the gas stream as the suction flow rate increases. This is due to the suction velocity which exceeds the terminal falling velocities of the fine particles size range. There was a reduction by weight in the fine particle emitted from the cyclone ranging between 14% to 52% by introduction of the suction. The finding serves as a basis for future work in reducing fine particulates from a cyclone separator

Effects of Honey-Spices Marination on Polycyclic Aromatic Hydrocarbons and Heterocyclic Amines Formation in Gas-Grilled Beef Satay

The effects of honey-spices marination on simultaneous formation of polycyclic aromatic hydrocarbons (PAHs) and heterocyclic amines (HCAs) in gas-grilled beef satay were investigated at different grilling temperatures (150 °C, 250 °C, and 350 °C). Beef satay samples used in this study were prepared using two types of honey-spices marination (Apis mellifera-spices and Trigona sp.-spices). Quantifications of fifteen PAHs using high performance liquid chromatography with fluorescence detection (HPLC-FLD) and nine HCAs using liquid chromatography tandem-mass spectrometry (LC–MS/MS) were performed with gradient programme. Results on PAHs and HCAs in marinated samples were compared with control. Highest concentrations (p < 0.05) of PAHs (marinated beef satay) and HCAs (control) were detected at 350 °C. The most prominent PAH and HCA were phenanthrene (24.61–84.36 ng/g) and 9H-pyrido-[4,3-b]indole (Norharman) (2.67–393.89 ng/g). Marination significantly (p < 0.05) reduced naphthalene, fluorene, pyrene, 2-amino-9H-pyrido[2,3-b]indole (AαC), 1-methyl-9H-pyrido-[4,3-b]indole (Harman), and Norharman in gas-grilled beef satay across all temperatures. Overall, inverse quantitative profiles of PAHs and HCAs formation were observed in marinated gas-grilled beef satay

Comparison of the performance of MR-deDuster with other conventional cyclones

A new type of cyclone design configuration called MR-deDuster, which contains multi cyclone, has been developed. A theoretical study had been carried out to evaluate and predict the performance of a MR-deDuster. In this paper, a comparative study was done to investigate the performance of MR-deDuster with other conventional cyclones in terms of collection efficiency and pressure drop. The performance of MR-deDuster was measured by its collection efficiency based on the particle size distribution of activated carbon. It was found that MR-deDuster is able to collect as high as 94% of PM10 which is high comparing with many other conventional cyclones. In addition, the pressure drop of the unit is relatively low compared to the other cyclones which highlight the ability of the unit to capture the fine particle at low pressure drop

Comparison of the performance of MR-deDuster with other conventional cyclones

A new type of cyclone design configuration called MR-deDuster, which contains multi cyclone, has been developed. A theoretical study had been carried out to evaluate and predict the performance of a MR-deDuster. In this paper, a comparative study was done to investigate the performance of MR-deDuster with other conventional cyclones in terms of collection efficiency and pressure drop. The performance of MR-deDuster was measured by its collection efficiency based on the particle size distribution of activated carbon. It was found that MR-deDuster is able to collect as high as 94% of PM10 which is high comparing with many other conventional cyclones. In addition, the pressure drop of the unit is relatively low compared to the other cyclones which highlight the ability of the unit to capture the fine particle at low pressure drop