OCR Text |
Show 5 investigated as a means of disposal. The waste paper was a relatively clean but mixed source containing visible amounts of aluminum foil. The Douglas fir wood and rice straw were pure fuels, containing very low amounts of extraneous materials. Relevant properties of the fuels are listed in Table 1, along with the combustor operating conditions. C02, CO, NO, NOx , and S02 concentrations were measured using non-dispersive infrared (NDIR) analyzers, 02 concentration by paramagnetic analyzer, and total hydrocarbons (THC) by flame ionization detector (FID). The maximum CO concentration that could be measured was 1,000 ppmv, which was exceeded in many cases when approaching an equivalence ratio of unity. Total hydrocarbons were not measured during the test with humus due to a malfunction of the instrument. In controlling the combustion stoichiometry, the furnace combustion air flow rate was fIxed and the fuel feed rate adjusted periodically to give exhaust gas oxygen concentrations as desired between zero and ambient. Concentrations were obtained on a dry gas basis, with Table 1. Fuel compositions and combustor conditions. Moisture (% wet basis) Ultimate Analysis (% dry fuel) C H o· N S CI -by difference. tunconfirmed. Proximate Analysis (% dry fuel) Ash Volatiles Higher Heating Value (MJ/kg, dry) Combustor conditions Wall temperature (OC) Natural gas preheat Residence time (s) Rice Humus Straw 12.5 32.37 3.83 26.91 121 0.39 0.65 34.64 51.59 12.89 900 1.8 9.6 39.24 4.97 33.92 1.00 0.10 0.62 20.15 65.62 14.74 900 2.1 Waste Paper 5.5 50.10 7.10 34.16 0.35 0.11 0.04 8.14 82.34 21 .14 900 • 1.1 Wood 9.0 50.95 6.17 42.24 0.12t 0.01 0.04 0.47 82.31 20.49 900 2.1 Wood Blend 10.2 49.01 5.78 37.47 0.62 0.08 0.12 6.92 74.97 18.99 900 4.5 |