يسعد صبااااااكم
لو سمحتووووووون ابي مسااااعده منكم بليز لاتردون
ابي حل ل هالسوال ضروري لو تقدرون لو اليوم يا مهندسين
انا بعدي طالبه
[RIGHT]The gas in the scrubber rises through a series of trays (metal plates perforated with
[RIGHT]Many small holes) and the solvent flows over the trays and through downcomers to the trays below . gas bubbles emerge from the holes in each tray and rise through the covering liquid and so2
[RIGHT]Diffuses out of the bubbles and into solution
[RIGHT]The volumetric flow rate of the feed gas is determined with an orifice
[RIGHT]Meter with adifferential mercury manometer being used to measure the pressure drop across the orifice
[RIGHT]Calibration date for this meter are tabulated here
[RIGHT]v. COLOR=#000000[/color]
[RIGHT]H(mm)
[RIGHT]142
[RIGHT]100
[RIGHT]204
[RIGHT]200
[RIGHT]247
[RIGHT]300
[RIGHT]290
[RIGHT]400
[/right]
[RIGHT]
[RIGHT]The molar density of the feed gas may be determined from the formula
[RIGHT]P(mol/liter) = 12.2p(atm)/T(k)
[RIGHT]Where p and T are the absolute pressure and temperature of the gas
[RIGHT]An electrochemical detector is used to measure the SO2 concentration in the inlet and oulet gas stream :
[RIGHT]SO2 in the sampled gas is absorbed in solution across which a fixed voltage is applied and the mole fraction of so2 in the gas is determined from the resulting current . the calibration curve for the analyzer is a straight line on a semilog plot of y(mol so2 /mol total) versus R (analyzer reading) which passes through the following points :
[RIGHT]R (rectangular scale)
[RIGHT]Y(log scale)
[RIGHT]20
[RIGHT]0.00166
[RIGHT]90
[RIGHT]0.1107
[/right]
[RIGHT]
[RIGHT]The following data are taken:
[RIGHT]T = 750 F
[RIGHT]P = 150 psig (feed gas)
[RIGHT]h (orifice meter)= 210 mm
[RIGHT]R (SO2 analyzer ) = 82.4
[RIGHT]R (so2 analyzer) =11.6 (outlet gas)
[RIGHT]Draw and completely label a process flowchart. Include in the labeling the molar flow- 1
[RIGHT]Rates and so2 mole fractions of the gas streams and the mass flow rates and so2 mass fractions of the
[RIGHT]Liquid streams . show that the scrubber has zero degrees freedom.
[RIGHT]
[RIGHT]Determine (i) the orifice meter calibration formula by plotting v. versus h on logarithmic axes and - 2
[RIGHT] (ii) the so2 analyzer calibration formula .
[RIGHT]Calculate (i) the mass fractions of so2 in the liquid effluent stream and -3
[RIGHT]COLOR=#000000 the rate at which so2 is removed from the feed gas (kg so2 /min)[/color]
[RIGHT]-The scrubber column trays commonly have diameters on the order of 1-5 meters and 4
[RIGHT]Perforation holes on the order of 4-12 mm in diameter leading to the formation of many tiny bubbles in the liquid on each tray. Speculate on the advantages of making the bubbles as small as possible.
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