OCR Text |
Show Table 1: Statistical confidence intervals for the residual mass of the 115 /-Lm, illinois #6 coal. T'" l' /-L (J' 95% Conf. 99% Conf. (ms) (-) (-) Interval (±) Interval (±) 6% Overall Oxygen Concentration 0.0 1.00 0.0 0.0 0.0 47.0 0.45 0.025 0.047 0.086 72.0 0.40 0.019 0.036 0.065 95 .0 0.39 0.040 0.073 0.133 117.0 0.34 0.022 0.041 0.075 12% Overall Oxygen Concentration 0.0 1.0 0.0 0.0 0.0 47.0 0.46 0.015 0.028 0.051 72.0 0.32 0.025 0.046 0.085 95.0 0.24 0.026 0.022 0.032 117.0 0.20 0.013 0.023 0.042 '" apprOXImate, based on 100 /-Lm partIcle. remains in the char can be calculated from (2) where Ii is the amount of the component in the char expressed as a fraction of its original amount, xii Xi,o is the ratio of the mass percent of the component to its original value in the raw coal, and mlmo has already been defined. When m lmo is determined by using a component as a tracer, this equation becomes (3) where tj,iltj,o is the ratio of the mass fraction of the tracer j to its original mass fraction. Possible systematic errors in this analysis would show the same trends as discussed in conjunction with the previous analysis. That is, errors in the mass balance technique would tend to decrease Ii whereas errors in the tracer technique would tend to increase Ii, as seen in Equation 2 and 3. 7 |