Spreadsheet: 072bae99-01be-4c68-8317-851d92ff7f25
Sheet: AirPreHeat

 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | Please read the document
 | Element Balance |  |  |  |  |  | Aluminum, kg/min
 | C |  |  |  |  |  | 800
 | H |  |  |  | Oxidant |  |  |  | Natural Gas |  |  |  |  |  |  | Outstream temperatures
 | O |  |  | Combustion air |  | Leak air |  |  | Temp, °C | 25 |  | Aluminum temp. out, |  | °C |  | Cooled stack gas temp., °C |  |  |  | Furnace stack gas temp, °C
 | N |  | Temp, °C | 25 |  | 25 |  |  | Press, [NAME] | 1 |  |  | 550 |  |  | Basis case | 700 |  |  | 800
 |  |  | Press, [NAME] | 1 |  | 1 |  |  | Actual flowrate, m3/min | 32.00192123998395 |  |  |  |  |  | Air PH case | 700.0076281160295
 |  |  | % O2 | 0.21 |  | 0.21 |  |  | Molar flowrate, [NAME]/min
 |  |  | % XS | 0.18 |  |  |  |  |  |  |  |  |  | Heat losses, kJ/min
 |  |  |  |  |  |  |  |  |  | ΔH°comb NG--LHV |  |  | Furnace |  | Burner |  |  | Ht Xchngr
 |  |  |  |  |  |  |  | NG component | Vol % | kJ/min |  |  | 186600 |  | 13400 |  | Basis case | 60160
 |  |  | Stoich. oxidant flowrate, [NAME]/min |  |  |  |  | CH4 | 0.95 |  |  |  |  |  |  |  | Air PH case
 |  |  | Actual oxidant flowrate, [NAME]/min |  |  |  |  | C2H4 | 0
 |  |  | Actual oxidant flowrate, m3/min |  |  | 8 |  | [NAME] | 0.03
 |  |  | STP oxidant flowrate, m3/min |  |  |  |  | C3H8 | 0
 |  |  | Molar oxidant/NG ratio |  |  |  |  | C4H10 + | 0 |  |  | 1.  Bring combustion air to 25°C
 |  |  |  |  |  |  |  | Other (N2) |  | 0 |  | 2.  Burn NatGas
 |  |  |  |  |  |  |  |  | Total (LHV) Combustion heat (kJ/min): |  |  | 3.  Heat CO2 to furn. stack gas temp.
 |  |  |  |  |  |  |  |  |  |  |  | 4.  [NAME]) to furn. stack gas temp.
 |  |  |  |  |  | Combustion Products |  |  |  |  |  | 5.  [NAME] to furn. stack gas temp.
 |  | Combustion gas | [NAME]/min | % |  |  |  | Cooled stack gas (includes leak air) | [NAME]/min | % |  | 6.  [NAME] to furn. stack gas temp.
 |  | CO2 |  |  |  |  |  | CO2 |  |  |  | 7.  Heat aluminum to ingot temp.
 |  | H2O(g) |  |  |  |  |  | H2O(g) |  |  |  | 8.  Heat loss from burner
 |  | O2 |  |  |  |  |  | O2 |  |  |  | 9.  Heat loss from furnace
 |  | N2 |  |  |  |  |  | N2 |  |  |  | 10.  Heat loss from ht xchngr
 |  | Total |  |  |  |  |  | Total |  |  |  | Total process heat effect
 |  |  |  |  |  |  |  | Flow, actual m3/min
 |  |  |  |  |  |  |  |  |  |  |  |  |  | Burner hot gas temperature |  | 1800.290297738036
 |  |  |  |  |  |  |  |  |  |  |  | 1.  Bring combustion air to 25°C
 |  |  |  |  |  |  |  |  |  |  |  | 2.  Burn NatGas
 |  |  |  |  |  |  |  |  |  |  |  | 3.  Heat CO2 to burner OG temp. |  |  |  |  |  |  |  | Basis Case |  | Air Preheat Case
 |  |  |  |  |  |  |  |  |  |  |  | 4.  [NAME]) to burner OG temp. |  |  |  |  |  |  | Combustion air temp, °C | 25 | 100 | 160 | 220 | 300
 |  |  |  |  |  |  |  |  |  |  |  | 5.  [NAME] to burner OG temp. |  |  |  |  |  |  | NG flow, actual m3/min | 32 | 29.1 | 27.1 | 25.3 | 23.3
 |  |  |  |  |  |  |  |  |  |  |  | 6.  [NAME] to burner OG temp. |  |  |  |  |  |  | Oxidant flow, actual m3/min | 360.4 | 410.2 | 443.4 | 471.9 | 503.9
 |  |  |  |  |  |  |  |  |  |  |  | 7.  Heat loss from burner |  |  |  |  |  |  | Oxidant flow, STP m3/min | 330.3 | 300.3 | 279.6 | 261.4 | 240.1
 |  |  |  |  |  |  |  |  |  |  |  | Total burner heat effect |  |  |  |  |  |  | Cooled stack gas temp, °C | 700 | 645 | 602 | 559 | 502
 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | [NAME] temp, °C | 1800 | 1847 | 1885 | 1923 | 1974
 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | Basis case | Air PH case
 |  |  |  |  |  |  |  |  |  |  |  | 1.  Heat comb. air from 25°C to T in |  |  |  | 0
 |  |  |  |  |  |  |  |  |  |  |  | 3. Cool CO2 to stack gas temp.
 |  |  |  |  |  |  |  |  |  |  |  | 4.  [NAME]) to stack gas temp.
 |  |  |  |  |  |  |  |  |  |  |  | 5.  [NAME] to stack gas temp.
 |  |  |  |  |  |  |  |  |  |  |  | 6.  [NAME] to stack gas temp.
 |  |  |  |  |  |  |  |  |  |  |  | 7.  Heat loss from heat exchanger. |  |  |  | 60160
 |  |  |  |  |  |  |  |  |  |  |  | Total heat xchngr heat effect
 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | Figure 1.  Chart of the relationship between air preheat temperature vs. NG and oxidant flow.
 |  | FREED Heat Content Data, kJ/mol =  A + BT + CT2.   T = °C
 |  |  | N2, 600 - 2200 °C |  |  |  | O2, 600 - 2200 °C
 |  | A | B | C |  | A | B | C
 |  | -2077 | 31.4 | 0.001317 |  | -2265 | 33.41 | 0.001255
 |  |  | H2O(g), 600 - 2200 °C |  |  |  | CO2, 600 - 2200 °C
 |  | A | B | C |  | A | B | C
 |  | -2563 | 36.04 | 0.004323 |  | -6014 | 52.48 | 0.002257
 |  |  |  |  |  |  |  | (note [NAME] heat units)
 |  |  | Air, 5 - 550 °C |  |  |  | Solid aluminum, kJ/kg
 |  | A | B | C |  | A | B | C
 |  | -713 | 28.43 | 0.00339 |  | -21.08902231117041 | 0.8745741605514789 | 0.0002543087984582314
 |  |  |  | Molar ΔH°comb. at 25 °C--LHV
 |  |  | kJ/g-mol
 |  | CH4 | -802.327
 |  | C2H4 | -1323.113
 |  | [NAME] | -1427.776
 |  | C3H8 | -2043.936
 |  | C4H10 | -2656.958