Expander flow capacity effects

Figure 4-109. Effect of adding stages on expander flow capacity and pressure ratio.

If the adsorbent has high capacity and feed contains many adsorbed components in addition to the product, there is the possibility that effective adsorbent density will increase during an extended adsorption cycle. In this case, the flow rate must be increased if constant bed height is required or, if constant flow rate is desired, the expanded bed height will decrease. 

Observe from the preeeding table that the well pressure decreases from 969 psi to 902 psi after 200 time steps. In Run 1, we assumed that F was identically zero, with 0.0 ftVlbf. Now we repeat our ealculations with a slightly different capacity, assuming that F = 0.00000001 ft /lbf All other parameters are identical to Run 1 for comparison. The effect of a nonzero (positive) capacity allows borehole fluid to expand initially. In this problem, this expansion supplies part of the produced flow, decreasing the production rate required at the sandface. Hence, the pressure decrease should in time be less rapid than in Run 1 which, again, assumed zero storage. The final results, shown here, are consistent with the physics, with a final pressure of 932 psi instead of 902 psi. 

The analysis results of the total loss of reactor coolant flow (accident) are shown in Fig. 7.101. The coolant in the blanket channels expands and flows into the upward flow seed channels, which is similar to the water source effect of the water rods in the Super LWR. However, the increase in the cladding temperature is larger than that in the Super LWR by about 180°C due to the smaller heat capacity. Furthermore, a strong buoyancy pressure drop in the downward flow seed channel induces reverse flow there and the absolute flow rate is kept small. This leads to a large increase in the cladding temperature in the downward flow seed channel. 

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