# Smith_Evaporators- - *Note that the U A Cp can be changed by the user 1 If desired for effect 3 the following input changes can be made a Liquor

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Unformatted text preview: *Note that the U, A, Cp can be changed by the user 1. If desired, for effect 3, the following input changes can be made a. Liquor input b. Solids input c. effect temperture d. water evaporated in that effect 2. For the base case, all other calculations will self calculate after the change is made. 3. For alternate cases, the internal loop must be corrected for the flash tank. To do this you must: a. Check effect 2, water evaporated. Set the cell to only equal the vapor into effect 3 b. Hit enter c. Then set effect 2 water evaporated to be the vapor into effect 3 minus the flashed steam d. Hit enter e. The loop should now calculate new values. Carter Smith INSTRUCTIONS Due: 11/10/2008 Steam Strong Black Liquor U, (Btu per (h A, ( Cp, (BTU p Liquor in Solids Water evapo Liquor ou Solids o vacuum, Carter Smith Problem 3: Multiple Effect Evaporators Due: 11/10/2008 T liquor in X BPR, Total Q, ∆T, X Vapor in Condensate Steam E Capa TK X Pressure C Parameter X TK A1 B1 C1 D1 PC P liquor side T vapor ou T liquor ou λ vapor out , T vapor in P vapor in , P vapor in , λ vapor in , ( Base Case: Three Evaporator * U= BTU per (hour * ft2 * °F) and Cp=BTU per (lb * °F) Process Parameters and Calculated Values Effect 1 Effect 2 Effe (hr * ft2 * °F)) 150 200 30 (ft2) 4000 4000 40 er (lb * °F)) 0.85 0.89 0.9 in, (lb/hr) 115536 136500 160 in, (%) 20.08% 17.00% 14.5 170 167 18 orated, (lb/hr) 21348 20964 235 ut, (lb/hr) 94188 115536 136 out, (%) 24.63% 20.08% 17.0 , (in Hg) 19 in, (°F) 6.02 5.56 5.2 X 297.34 299.22 170.20 166.81 164 , (°F) 4.41 3.39 2.7 174.61 170.21 166 996.10 998.14 999 , (Btu/hr) 21264922.11 20924500.25 207060 (°F) 35.44 26.16 17. 210.06 196.36 184 X 275.20 282.81 289 0.96 0.73 0.5 14.13 10.68 8.2 971.58 980.14 987 in, (lb/hr) 21886.95 21348.39 2096 e out, (lb/hr) 21348.39 20963.91 2350 Economy 0.98 0.98 1.1 acity 21348.39 20963.91 2350 K 372.08 364.47 357 X 275.19 282.80 289 Constants Steam Table Equation Data Equilvalent Parameter Heat Vap (BTU/lb) Temp 647.27 - TK a 0.01-0. (T-32)/1.8 + 273.16 b-1.3 3.8 3.24 c-8.21 11. 0.01 d-16.38 31. e f 218.17 g 1045.81 86. e , (psia) ut , (°F) ut , (°F) , (Btu/lb) in , (°F) , (atm) , (psia) (Btu/lb) rs in Series Weak Black Liquor ect 3 00 00 .92 000 50% 83 500 500 00% 9.3 23,500 lb per hour 19.3 in Hg vacuum 160,000 lb per hour 183 °F 14.5 % solids .22 4.05 .76 6.82 9.79 078.23 .26 4.07 9.64 .56 .21 7.70 63.91 00.00 .12 00.00 7.64 9.63 p (°F) .18 .84 .48 .13 .59 should use Temp of Liquor Out, not Temp of Vapor Out (-3pts) Steam Strong Black Liquor U, (Btu per (h A, ( Flash Tank Cp, (BTU p Carter Smith Problem 3: Multiple Effect Evaporators Due: 11/10/2008 Cond. eff 1 20871.83 Liquor in temp eff 1 202.40 Solids cool temp eff 3 164.05 L cool eff 3 999.79 Water evapo flash steam 2105.78 Liquor ou Solids o vacuum, X BPR, Total Q, ∆T, X Vapor in Condensate Steam E Capa TK X Pressure C Parameter X TK A1 B1 C1 D1 PC T liquor in P liquor side T vapor ou T liquor ou λ vapor out , T vapor in P vapor in , P vapor in , λ vapor in , Alternate Case: Addition of a...
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## This note was uploaded on 02/07/2011 for the course PSE 417 taught by Professor Kirkman during the Fall '10 term at N.C. State.

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Smith_Evaporators- - *Note that the U A Cp can be changed by the user 1 If desired for effect 3 the following input changes can be made a Liquor

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