Wet scrubbers are employed in process industries for scrubbing both gases and particulates. To achieve a high efficiency for scrubbers and meet pollution control standards, industries need a new type of scrubber. In this paper an attempt has been made to design a new spray scrubber by a twin fluid air-assisted atomizer for the removal of SO 2 . Experimental results for scrubbing of lean sulfur dioxide gas by a novel spray tower using a twin fluid air-assisted atomizer have been presented. The efficiency of the spray column was found to increase with increase in spray liquid flow rate (8.35 × 10 -6 -33.34 × 10 -6 m 3 /s) and concentration of SO 2 gas (400-1200 ppm). A maximum of almost 99.99% efficiency was observed for 1200 ppm at 3.354 × 10 -3 m 3 /s gas flow rate and 33.34 × 10 -6 m 3 /s spray liquid flow rate.

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Precision manufacturing processes like grinding are capable of producing parts to high dimensional accuracies and excellent surface finish. Process monitoring is critical in grinding to achieve accuracy, finish and surface integrity. In this paper an attempt has been made to explore the possibility of process monitoring in grinding by spark field measurements. After establishing the correlation between the chip sizes and roughness produced in grinding, a thermal model is presented showing the relationship between chip size, temperature and time. Using a CCD camera and a computer, the spark field in grinding was monitored and analyzed. Results indicate the possibility of monitoring the process by this approach.

Growing environmental concern and tightening of the regulations for particulate emission from various sources force us to think of an alternative technology for their control, which is cost effective and of high performance. A spray column using a wet process to control the particulates offers design simplicity, and has various other advantages over other conventional equipment used in industry. This work presents the hydrodynamic study of the spray column for the removal of particulates from gaseous wastes. Experiments were carried out to quantify pressure drop ( P ), for varied gas and liquid rates ranging from 3.084 × 10 −3 to 5.584 × 10 −3 Nm 3 /s and 8.35 × 10 −6 to 33.34 × 10 −6 m 3 /s, respectively with Q L /Q G ratio ranging from 1.59 to 10.81 m 3 per 1000 ACM (actual cubic meter). The maximum pressure drop incurred in the column is 327 N/m 3 , which is at a gas rate of 5.584 × 10 −3 Nm 3 /s, liquid rate of 33.34 × 10 −6 m 3 /s, and an inlet solid loading range of 0-2.5 kg/m 3 . This is quite low compared to other wet processbased equipment, thus making it a low power loss scrubber. These results have further demonstrated the impact of solid dust (particulates) on the pressuredrop-hydrodynamics. A correlation was put forward for prediction of the overall pressure drop in the column. The experimental values agreed well with the predicted values, with minimum percentage error and standard deviation. 