Heatup paths matrix calculations

Table 17.3. Is1 catalyst bed heatup path matrix with S03 and C02 in feed gas". Cells D15 to H15 contain -H°9QK values. Cells 115 to M15 contain H°2QK values. All are calculated with Appendix G s enthalpy equations. 820 K part way down the catalyst bed is shown to be equivalent to oxidation of 46.7% of the feed gas s S02. 

After-intermediate-H2S04-making heatup paths are calculated exactly as before-H2S04-making heatup paths, Chapter 11 and Appendix I. Table 19.1 shows the matrix for this chapter s afier-H2S04-making input gas. Fig. 19.4 shows an equivalent partial heatup path. 

Table 14.3. Heatup path points for Fig. 14.2 s 2nd catalyst bed. The points are shown graphically in Fig. 14.3. They have been calculated using matrix Table 14.2 with enthalpy equations in cells H15-K15, Appendix K. An increase in gas temperature from 700 K to 760 K in the 2nd catalyst bed is seen to be equivalent to an increase in % SO oxidized from 69.2% to 89.7%.

Fig. 19.4. Equilibrium curve and partial heatup path for after-intermediate-fESO -makint catalyst bed. The heatup path has been calculated with matrix Table 19.1 as in Appendix I. The steepness of the heatup path is due to the small amount of S02 fuel in the input gas. The equilibrium curve and heatup path are only valid for the specified inputs. The S02 and 02 inputs are equivalent to 0.234 volume% S02 and 7.15 volume% 02.

Heatup path calculations are simplified by putting enthalpy-as-a-function-of-temperature equations in cells D8-J8 of matrix Table 11.2. The equations are listed in Appendix G. They change Eqn. (11.7) to ... 

Insertion of these equations into Table 11.2 (with 690 K and 820 K in cells F10 and J10) automatically gives the Table 11.2 result, as shown below. The temperatures in cells F10 and J10 can then be changed at will - and new heatup path points automatically calculated. Example results are shown after Table 1.1. Matrix solving is described in Appendix H. 

The table s matrix doesn t have to be re-solved for this or any other calculation. A few other heatup path points are ... 

This equilibrium temperature is copied into cell J30, which causes the matrix to calculate the heatup path % SO2 oxidized (cell 139) that is equivalent to this temperature. The difference between the guesstimated equibbrium %S02 oxidized in cell FI 1 and the calculated heatup path % SO2 oxidized in ceb 139 is determined in ceU G47. 

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