Q4: Sulphur dioxide produced by the combustion of sulphur in air is absorbed in water. Pure SO₂ is then recovered from the solution by steam stripping. Make a preliminary design for the absorption column. The feed will be 5000 kg/h/of gas containing 8 per cent v/v SO₂. The gas will be cooled to 20°C. A 95 per cent recovery of the sulphur dioxide is required. Use Cornell's method. Data: NOG-8, Mwt gas-29, Water flow rate-29.5 kg/s, Fp = 170 m²¹, Py = 1.21 kg/m³, pressure drop = 20 mm H₂O/m packing, HL= 10-3 N s/m², D₁ = 1.7 x 109 m²/s, D, = 1.45 x 10-5 m²/s, Hy = 0.018 x 10-3 Ns/m² Useful formulas: HG= 0.011 h (Sc)0.5 Dc 0.305, H₂ = 0.305 h (Sc).5 K3 1.11 Z 3.05 Z 3.05 0.15 0.33 /(Lw f1f₂f3) 0.5

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12. Cylindrical metallic parabolic solar thermal concentrator A. Does not rotate. B. It rotates around one axis only. C. It rotates around two axes only. D. The concentration ratio achieved is: 500-1000. E. The concentration ratio achieved is: 50-100. F. The concentration ratio achieved is: 10-50. * A + D only. B +E only. B + F only. O C + E only

PROBLEM 2 In general, the disposal of hot streams to the environment is not a good a practice due to the risk of violating EPA regulations and also, it represents as waste of potential useful energy. For example, raising the temperature of lakes, rivers, and atmosphere have negative consequences on the ecosystems. In this problem, a gas stream at 500°C contains eight percent mole carbon monoxide and the balance carbon dioxide. Before disposing this gas mixture stream into the atmosphere, it makes sense to recover some of its energy first. To achieve this we will use a heat exchanger where the gas stream flows across the tubes. Water flows inside the tubes entering at 25°C and it is fed at a ratio of 0.2 mole water per mole of the hot gas. The water is heating to its boiling point forming saturated steam at five bar. The steam produced can be used for heating or power generation in the facilities or as the feed for another unit operation. You can assume that heat exchanger is thermally…