Much waste heat is generated in the rock salt boiling process and is usually discharged directly from a stack and the exhaust air. Recovering heat from the exhaust air by the heat exchanger is a promising technology that improves energy utilization efficiency and reduces exhaust emissions. A rock salt incubator based on a heat recovery process was proposed in the present study to recover the thermal energy from the exhaust gas of a small and medium enterprise. The present study investigates the thermal efficiency test with heat recovery in the rock salt boiling process experimentally and numerically. The wet salt crystal of each container was performed with three inlets hot flue gas temperature to determine the thermal performance of the salt incubator. The thermal performance obtained from the experimental are 33.02%, 36.63%, and 38.06% for inlet exhaust temperature of 150℃, 250℃, and 350℃, respectively. Good agreement from the comparison between the predicted and measured results (error 5.24%) demonstrates that a numerical model is appropriate for investigating the thermal system's energy efficiency analysis and evaluating different configurations and solutions to fulfill the industry requirements. Future studies should be designed to explore how more thermal performance reduces environmental and global warming problems.
This study was aimed to apply the use of ultrasonic welding to weld round plastic tubes. The ultrasonic welding machine was designed to be able to work with a normal ultrasonic welding transducer by rotating the tube while it is being welded. The specimens used in this study were round plastic tubes (PMMA) with diameter of 35 mm and 2 mm thickness. End of each tube was machined to have angle of 2.8, 3.8 and 5.7 degree in order to create contact angle at the interface. The specimens were welded with frequency of 28 kHz and tube rotational speeds of 25 rpm, 45 rpm and 100 rpm. The axial force was applied to the tube in order to enhance the quality of joint. The experimental result revealed that the modified ultrasonic welding machine can generate the welded area around the circumference of tube. It was found that the axial force and contact angle have some effect to the quality of joint. The contact angle of 2.8/2.8 provided highest welded area compared to 3.8/3.8 and 5.7/5.7 degree of contact angle. In addition, the axial force between 80 N -120 N provided high value of welded area. The pattern of welded area is also presented and discussed in the paper.
This work has studied the performance of benzene treatment from cigarette smoke using the prepared CNT/TiO2/PVA loaded on the paper filter in the air purifier reactor. CNT/TiO2 nanomaterial was prepared from a mixture of carbon nanotubes modified with sulfuric acid and titanium dioxide by a simple mixing method in the ambient temperature. CNT/TiO2 nanomaterial was then loaded on the paper filter by a filtrating technique using 12%w/v polyvinyl alcohol (PVA) as a co-polymer. The weight of CNT/TiO2 loaded on the paper filter was fixed at 3 g. The ratios of CNT: TiO2 was varied at 1:5, 1:10, and 1:15 w/w, respectively. The performance of air purifier using CNT/TiO2/PVA loaded on the paper filter with various ratios was investigated on the photocatalytic activity of benzene treatment from cigarette smoke under visible light. The decreased benzene concentrations were analyzed by GC-FID. As the results, the ratio of CNT/TiO2 loaded on the paper filter at 1:10 showed the highest performance by up to 45%, while the ratio of CNT/TiO2 at 1:15 showed 30% and CNT/TiO2 at 1:5 was the lowest of 22%, respectively. This is because adding the optimum CNT to TiO2 can be improved the adsorption efficiency and the ability to degrade benzene from cigarette smoke. Additionally, CNT also assists in reducing the recombination of TiO2 particles that effect to the high performance on the photocatalytic activity. Therefore, the prepared CNT/TiO2/PVA loaded on the paper filter could be used for the air treatment.
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