Regarding the increase in turbine exhaust pressure to boost the power of a single unit
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Increasing the number of exhaust outlets at the last stage of the turbine can raise the power output of a single unit; for example, using two exhaust outlets can double the power output of such a unit. I’m not sure what the principle behind this is. Steam first flows through the final stage blades and then combines together before being discharged from the exhaust outlet. Increasing the number of exhaust outlets seems to have no relation to the speed at which the steam passes through the final stage blades; so why can this increase the power output of a single unit?
I’ve figured it out: if a low-pressure cylinder has only one set of rotors, it will have only one exhaust port. If the low-pressure cylinder has two sets of impellers that are symmetrical to each other, then there will be two exhaust ports in those two symmetric directions. A single low-pressure cylinder can have at most two exhaust ports; if more exhaust ports are needed, multiple low-pressure cylinders must be used.