The SO2 scrubbing tower described in Problem 4.36 is to be used to reduce the SO2 mole traction in the waste gas to a level that meets air-quality standards. The solvent feed rate must be large enough to keep the SO-> mass fraction in the exit liquid below a specified maximum value.
- Draw and label a flowchart of the tower. Along with the molar flow rates and SO2 mole fractions of the four process streams, label the feed gas temperature and pressure [Ti(°F), P((psig)], the feed gas orifice meter reading [/ti(mm)J, the SO2 analyzer reading for the feed gas (Pi), the volumetric feed rate of solvent to the column [V2(m3/min)], and the SO2 analyzer reading for the exit gas (P3). (The temperature and pressure units are taken from the calibration curves for the gauges used to measure these variables.)
- Derive a series of equations relating all of the labeled variables on the flowchart. The equations should include the calibration formulas calculated in Part (b) of Problem 4.36. Determine the number of degrees of freedom for the process system. In the remainder of the problem, you will be given values of measured feed gas stream variables [T|(°F), Pi(psig), Ai(mm), and Pi], the maximum allowed SO 2 mole fraction in the exit solution [-V-»]. and the specified SO 2 mole fraction in the exit gas (y 3), and asked to calculate the expected SO 2 analyzer reading for the exit gas (P 3) and the minimum volumetric flow rate of solvent (V2). Part (c) involves using a spreadsheet for the calculation, and Part (d) calls for an independent calculation using an equation-solving program.
= 0.02, and v3 =
0.05.0.025.0.01.0.005. and 0.001. If you did not already do so in Part (c). draw on a single graph plots of Vt versus y3 for each of the two given values of .v4 and briefly explain the shape of the curves and their position relative to each other.
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Chapter 4 Solutions
ELEMENTARY PRINCIPLES OF CHEM. PROCESS.
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