Pressure Leaf Clarification Costing

PRESSURE LEAF CLARIFICATION COSTING.XLS Pressure leaf filter sizing and costing - effect of cycle time capital and precoat costs considered ******** 3 3600 0.01 2E+11 1E+11 50 4.5 30 2 14 350 350 350 ******** Volume filtrate (m^3) 2.1 4.2 6.3 8.4 10.5 12.6 14.7 16.8 18.9 21.0 23.1 25.2 27.3 29.4

******** m^3 seconds Pa.s m/kg m^-1 kg/m^3 Bar % mm hours days kg/m^3 £/tonne ******** Filter area (m^2) 20.7 28.8 35.1 40.4 45.0 49.2 53.1 56.7 60.1 63.3 66.3 69.2 72.0 74.7

******** ******** ******** ******** ******** ******** ******** ******** ******** ******** ******** ******** ******** ******** ******** Filter cost (£) 15267 20600 24588 27895 30773 33349 35699 37870 39898 41805 43610 45326 46966 48538

50000

Costs, pounds.

INPUTS: ******** ******** Volume filtered: in unit time: Viscosity: Cake specific resistance: Cloth resistance: Slurry concentration: Max. pressure differential: Downtime as % of cycle: Precoat depth: Day length: Days per year: Precoat bulk density: Cost of filter aid: ******** ******** Cycle ******** Form time ******** time (hours) ******** (hours) 1.0 ******** 0.7 2.0 ******** 1.4 3.0 ******** 2.1 4.0 ******** 2.8 5.0 ******** 3.5 6.0 ******** 4.2 7.0 ******** 4.9 8.0 ******** 5.6 9.0 ******** 6.3 10.0 ******** 7.0 11.0 ******** 7.7 12.0 ******** 8.4 13.0 ******** 9.1 14.0 ******** 9.8

60000

40000 30000 20000 10000 0 0.0

Filtrate rate: mu.Rm.q: mu.alpha.w.q: Number Precoat precoats cost (annual) (£) 4900 24812 2450 17305 1400 12038 1050 10387 700 7723 700 8445 700 9108 350 4863 350 5153 350 5427 350 5688 350 5938 350 6177 350 6407

Filter Precoat Total

5.0

10.0 Cycle time, hours.

Annual cost (£) 40079 37905 36625 38282 38496 41793 44807 42733 45051 47232 49298 51264 53143 54945

0.0008333 833333.33 83333333 Oil cleared (m^3) 10290 10290 8820 8820 7350 8820 10290 5880 6615 7350 8085 8820 9555 10290

m^3/s

Cost per volume (£/m^3) 3.89 3.68 4.15 4.34 5.24 4.74 4.35 7.27 6.81 6.43 6.10 5.81 5.56 5.34

15.0