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Show "NOx Reduction by Low Pressure Steam Addition" a. Fuel Gas Properties The fuel gas was a mixture of hydrogen (27.2 mole %), methane (71.2%), ethylene ( 1.1 %); the remaining 0.5% are heavier hydrocarbons. The molecular weight is 12.5; lower heating value, 22,720 Btu/ Lb and higher, 25,370. The multiply factor to convert ppm V NOx @ 3% oxygen dry to Lb NOx per MMBtu HHV is 0.0011 5. E. Evaluation of Data 1 . Field Data Summary The averaged data sorted by steam pressure and then by oxygen concentrations are tabulated below: TEST TEST STEAM 02 DRY CO DRY NOX DRY CO DRY NOX DRY MID # PSIG % PPMV PPMV PPMV PPMV TIME As Read As Read 3% 02 3% 02 10 :25 3 0 .00 1 .23 17.67 111.67 16 .09 101 .69 10:08 2 0 .00 1 .37 16.33 110 .33 14 .98 101.16 09 :40 1 0 .00 1 .80 16 .00 113.50 1 5 .01 106.40 1 4 : 23 5 0 .00 2 .20 19.00 119.00 18 .19 113.97 15 : 41 6 3 .00 1 .87 1 3 .67 97 .00 12.85 91 .27 15 :47 7 11 .00 1 .78 1 2 .50 75.25 11 .71 70.49 1 5 : 56 8 1 9 .00 1 .56 11 .00 57 .80 10 .20 53 .53 16 : 1 3 9 29 .00 1 .70 8.33 50 .83 7.78 47 .43 1 3 : 37 4 29 .00 2 .23 6 .33 46.33 6 .06 44 .46 16 :28 1 0 49 .00 1 .47 8 .67 34 .00 7 .98 31 .33 Zero steam addition, test 5, was repeated at 14:23 Hours. There is a 7.5 ppmv NOx difference between Test 1 at 9:40 having 1.80 %02 dry and Test 5 at 14:23 having 2.20 %02 dry . Two tests at 29 PSIG steam header pressure were done about 3 hours apart, NOx difference was 3.0 ppmV but in the opposite direction expected based on the oxygen concentrations. Jordan Loftus ScD Page 6 |
