Second catalyst bed intercepts

SO2 oxidized/tempeiSLtme points near Fig. 14.3 s expected second catalyst bed intercept point. 

Calculate the second catalyst bed intercept point as described in Appendix M. Make sure that you use 685 K for the second catalyst bed gas input temperature. 

The second catalyst bed intercept worksheet (below) is prepared as follows ... 

The actual second catalyst bed intercept value is determined by the Goal Seek calculation in Section M.4. 

Table N.l Third catalyst bed heatup path matrix with enthalpy equations second catalyst bed intercept quantities (Appendix M). Cell... 

Third catalyst bed feed gas kg mol from cell AB38-AB42 second catalyst bed intercept data ... 

Second catalyst bed intercept (exit gas) quantities (per kg mol of first catalyst bed feed gas)... 

Figure 13.2 First catalyst bed heatup path, equilibrium curve, and intercept point (Fig. 12.1). The first catalyst bed s exit gas is its intercept gas (Section 12.12). It is cooled and fed to a second catalyst bed for more SO2 oxidation.

Figure 13.3 Cooldown path added to Fig. 13.2. It is a horizontal line at the first catalyst bed intercept % SO2 oxidized level—between the first catalyst bed intercept temperature and the specified second catalyst bed gas input temperature. Gas composition and % SO2 oxidized do not change in the gas cooling equipment.

Second catalyst bed input gas quantities are specified to be first catalyst bed intercept gas quantities. 

F ure 14.3 Figure 13.3 with the addition of Table 14.3 s heatup path (upper left). The heatup path starts at first catalyst bed intercept % SO2 oxidized and second catalyst bed gas input temperature. The ending slope of the first catalyst bed heatup path is the same as the beginning slope of the second catalyst bed heatup path because SO3, SO2, O2, and N2 heat capacities 6H°IAT) are independent of temperature (Appendix G). 

Table 15.1 Second catalyst bed % SO2 oxidizedltempemtars points near heatup path-equilibrium curve intercept...

Figure 15.1 extends Fig. 14.3 s second catalyst bed heatup path to Section 15.2.1 intercept. 

Figure 16.2 Specifications for (i) 2-3 cooldown and (ii) third catalyst bed heatup path and intercept calculations. The first and second catalyst bed exit gas quantities are equivalent to ...

Table 21.1 Bottom half of Table 0.1 s third catalyst bed heatup path-equilibrium curve intercept worksheet. Input and output gas enthalpies are shown in rows 43 and 44. Note that they are the same. This is because our heatup path calculations assume no convective, conductive, or radiative heat loss during catalytic SO2+O.5O2—>S03 oxidation (Section 11.9). First and second catalyst bed enthalpies are calculated similarly using Tables J.2 and M.2. 

Second catalyst bed input gas quantities are entered in cells E8, G8,18, and K8. They are Fig. 14.2 s first catalyst bed intercept quantities. They are automatically copied into cells C21-C24. 

Table M.l Worksheet for determining second catalyst bed heatup path-equihbrium curve intercept. The nonzero equilibrium curve % S 02 oxidized — heaiappath % SO2 oxidized value in cell G47 indicates that cell Fll s guesstimated 94% SO2 oxidized is not the intercept value. The actual intercept value is calculated in Table M.2. 

Suggested second catalyst bed equilibrium curve intercept % SO oxkfizecf. - 94.0 ... 

Second catalyst bed input gas temperature = 700 V- Intercept temperature, cell A14 = 773.2 ... 

These intercept quantities are automatically copied into the second catalyst bed worksheet area as described in Section S.2. 

The second catalyst bed worksheet area is set up much like the first (with a different input gas temperature, Table 18.1). The distinctive difference is that the input quantities in row 8 are first catalyst bed exit (intercept) gas quantities from Table S.l cells B38 through B42. The latter are automatically copied into the second catalyst bed area... 

Second catalyst bed heatup path matrix (in means "in input gas," out means in intercept gas") ... 

Second bed intercept gas quantities are needed for Chapter 16 s third catalyst bed calculations. They are obtained from the intercept results in Table M.2. They are ... 

Second and third catalyst bed heatup path and intercept calculations are very similar. Their differences are ... 

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